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Symptom Troubleshooting Index

NOTE: Check for DTCs with the HDS and troubleshoot those first before do symptom troubleshooting procedures
SYMPTOM TROUBLESHOOTING INDEX

Symptom Probable cause(s) Notes
When you turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, the D indicator comes on and stays on in all shift lever positions, or it never comes on at all
  1. F-CAN communication line error
  2. Gauge control module defective
  3. PCM defective
A/T gear position indicator does not come on while the shift lever is in that position, shift indicator does not work
  1. F-CAN communication line error
  2. Gauge control module defective
  3. PCM defective
  4. Transmission range switch defective
  5. Shift cable broken or out of adjustment
  6. Connection between shift cable and transmission or shift lever is worn
Speedometer does not work
  • F-CAN communication line error
  • Gauge control module defective
  • PCM defective
  • Transmission range switch defective
When you press the paddle shifter + (upshift switch) in D and S, the transmission does not upshift A problem in the paddle shifter + (upshift switch) circuit Check the paddle shifter + (upshift switch) circuit (see PADDLE SHIFTER + (UPSHIFT SWITCH) CIRCUIT TROUBLESHOOTING )
When you press the paddle shifter - (downshift switch) in D and S, the transmission does not downshift A problem in the paddle shifter - (downshift switch) circuit Check the paddle shifter - (downshift switch) circuit (see PADDLE SHIFTER - (DOWNSHIFT SWITCH) CIRCUIT TROUBLESHOOTING )
M indicator does not come on even when the paddle shifter + (upshift switch) or paddle shifter - (downshift switch) is operated in sequential sportshift mode
  1. F-CAN communication line error
  2. Gauge control module defective
  3. PCM defective
Shift lever cannot be moved from P while pressing on the brake pedal
  1. Brake pedal position switch circuit
  2. Brake pedal position switch defective
  3. Shift lock solenoid defective
  4. Shift lock solenoid control circuit
  5. Shift lock mechanism defective
  6. Accelerator pedal position sensor defective
  7. Accelerator pedal position sensor circuit
  8. Throttle body defective
  9. Transmission range switch ATPP switch stuck OFF
  10. Transmission range switch ATPP switch circuit open
  11. PCM defective
 Troubleshoot the shift lock system circuit (see SHIFT LOCK SYSTEM CIRCUIT TROUBLESHOOTING )
HDS does not communicate with the PCM DLC circuit Troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING )
Engine runs, but vehicle does not move in any gear
  1. Low ATF level
  2. Shift cable broken or out of adjustment
  3. Connection between shift cable and transmission or shift lever is worn
  4. Axle disengaged
  5. ATF pump worn or binding
  6. Regulator valve stuck or spring worn
  7. ATF strainer clogged
  8. Foreign material in separator plate orifice
  9. Mainshaft worn or damaged
  10. Countershaft worn or damaged
  11. Final gears worn or damaged
  12. Park mechanism defective
  13. Selector control shaft worn or damaged
  14. Drive plate defective
  15. Torque converter defective
  16. Transmission-to-engine assembly error
  • Check the ATF level, and check the ATF cooler line for leaks and loose connections If necessary, clean the ATF cooler lines
  • Check for a loose shift cable at the shift lever and the transmission control lever
  • Check the stall speed
  • Check the line pressure
  • Improper alignment of the ATF pump and the torque converter housing may cause ATF pump seizure The symptoms are mostly an rpm-related ticking noise or a high pitched squeak
  • Check the regulator valve in the regulator valve body for free movement, and check the valve springs for wear and damage
  • Check the ATF strainer for debris If the strainer is clogged, find the damaged components that caused the debris If no cause for contamination is found, replace the torque converter
  • Check for a clogged orifice in the separator plate If the orifice is clogged, remove it and clean the separator plate orifice
  • Inspect the differential pinion gears for wear If the differential pinion gears are worn, replace the differential assembly, replace the ATF strainer, thoroughly clean the transmission, and clean the cooler and lines
  • Replace the torque converter
  • Be careful not to damage the torque converter housing when replacing the main ball bearing You may also damage the ATF pump when you torque down the main valve body This will cause ATF pump seizure, use the proper tools
  • Install the main seal flush with the torque converter housing If you push it into the torque converter housing until it bottoms out, it will block the fluid return passage and result in damage
  • Inspect the countershaft and the secondary shaft for wear and damage
  • Inspect the park mechanism at the park lever link, park gear, and 2nd gears
  • Check the drive plate for wear and damage, replace the drive plate if it is worn or damaged
  • Check for a misinstalled transmission
Vehicle moves in R, but not in D or S
  1. 1st accumulator defective
  2. Idler gears worn or damaged
  3. 1st clutch defective
  4. 5th clutch defective
  • Check the 1st and 5th clutch pressure (see PRESSURE TEST )
  • Inspect the mainshaft, the countershaft, the secondary shaft, the intermediary shaft, and the idler gears for wear and damage
  • Inspect the 1st clutch for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between the clutch end-plate and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate If they are OK, adjust the clearance with the clutch end-plate
  • Check the 1st accumulator piston, the O-ring, and the spring in the accumulator body for wear and damage
Vehicle moves in S and R, but not in D
  1. 1st gear one-way clutch defective
  2. 1st gears worn or damaged
  3. 1st clutch defective
  • Check the 1st clutch pressure (see PRESSURE TEST )
  • Inspect the mainshaft, the countershaft, 1st gears, and the one-way clutch for wear and damage
  • Inspect the 1st clutch for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between the clutch end-plate and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate If they are OK, adjust the clearance with the clutch end-plate
Vehicle moves in D and R, but not in 1st in S 1st-hold clutch defective
  • Check the 1st-hold clutch pressure (see PRESSURE TEST )
  • Inspect the 1st-hold clutch for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between clutch plate B and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate
Vehicle moves in D and R, but not in 2nd in S
  1. 2nd accumulator defective
  2. 2nd clutch defective
  • Check the 2nd clutch pressure (see PRESSURE TEST )
  • Inspect the 2nd clutch for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between the clutch end-plate and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate If they are OK, adjust the clearance with the clutch end-plate
  • Check the 2nd accumulator piston, the O-ring, and the spring in the accumulator body for wear and damage
Vehicle moves in D and S, but not in R (or moves forward in R)
  1. Shift fork shaft stuck
  2. 5th accumulator defective
  3. 5th clutch defective
  4. Reverse gears worn or damaged
  5. Reverse idler gear shaft/holder worn or damaged
  6. Reverse selector or reverse selector hub worn or damaged
  • Check for a missing shift fork bolt on the shift fork shaft
  • Check the shift fork shaft detent for wear and damage
  • Check for a stuck servo valve in the regulator valve body, and check the O-ring for wear and damage
  • Check the stall speed in R (see STALL SPEED TEST )
  • Check the 5th clutch pressure (see PRESSURE TEST )
  • Inspect the 5th clutch for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between the clutch end-plate and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate If they are OK, adjust the clearance with the clutch end-plate
  • Check the 5th accumulator piston, the O-ring, and the spring in the accumulator body for wear and damage
  • Inspect the reverse idler gear shaft/holder for wear and damage
  • Inspect the reverse selector gear teeth chamfers, and inspect the engagement teeth chamfers of the countershaft 5th gear and the reverse gear Replace the reverse gears and the reverse selector if they are worn or damaged If the transmission makes clicking, grinding, or whirring noises, also replace the mainshaft 5th gear, the reverse idler gear, and the countershaft 5th gear
Poor acceleration, flares when starting off in D, S, and R
  1. Low ATF level
  2. Shift cable broken or out of adjustment
  3. ATF pump worn or binding
  4. Regulator valve stuck or spring worn
  5. Stator shaft worn or damaged
  6. ATF strainer clogged
  7. Torque converter one-way clutch defective
  8. Torque converter check valve defective
  9. Shift valve E defective
  • Check the ATF level, and check the ATF cooler line for leaks and loose connections If necessary, clean the ATF cooler lines
  • Check for a loose shift cable at the shift lever and the transmission control lever
  • Check the stall speed (see STALL SPEED TEST )
  • Check the line pressure (see PRESSURE TEST )
  • Improper alignment of ATF pump and the torque converter housing may cause ATF pump seizure The symptoms are mostly an rpm-related ticking noise or a high pitched squeak
  • Check the regulator valve in the regulator valve body for free movement, and check the valve springs for wear and damage
  • Check the stator shaft splines for wear and damage
  • Check the ATF strainer for debris If the strainer is clogged, find the damaged components that caused the debris If no cause for contamination is found, replace the torque converter
  • Check the torque converter check valve in the main valve body for free movement, and check the valve spring for wear and damage
  • Check shift valve E in the main valve body for free movement, and check the valve spring for wear and damage
  • Replace the torque converter
Poor acceleration, flares when starting off in D, S, and R, stall speed high in D
  1. Low ATF level
  2. 1st accumulator defective
  3. 1st clutch defective
  • Check the stall speed (see STALL SPEED TEST )
  • Check the 1st clutch pressure (see PRESSURE TEST )
  • Inspect the 1st clutch for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between the clutch end-plate and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate If they are OK, adjust the clearance with the clutch end-plate
  • Check the 1st accumulator piston, the O-ring, and the spring in the accumulator body for wear and damage
Poor acceleration, flares when starting off in D, S, and R, stall speed high in 1st in S
  1. Low ATF level
  2. 1st-hold clutch defective
  • Check stall speed (see STALL SPEED TEST )
  • Check the 1st-hold clutch pressure (see PRESSURE TEST )
  • Inspect the 1st-hold clutch for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between clutch plate B and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate
Poor acceleration, flares when starting off in D, S, and R, stall speed high in 2nd in S
  1. Low ATF level
  2. 2nd accumulator defective
  3. 2nd clutch defective
  • Check the 2nd clutch pressure (see PRESSURE TEST )
  • Inspect the 2nd clutch for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between the clutch end-plate and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate If they are OK, adjust the clearance with the clutch end-plate
  • Check the 2nd accumulator piston, the O-ring, and the spring in the accumulator body for wear and damage
Poor acceleration, flares when starting off in D, S, and R, stall speed high in R
  1. Low ATF level
  2. Shift cable broken or out of adjustment
  3. 5th accumulator defective
  4. 5th clutch defective
  • Check for a loose shift cable at the shift lever and the selector control lever
  • Check the stall speed in R (see STALL SPEED TEST )
  • Check the 5th clutch pressure (see PRESSURE TEST )
  • Inspect the 5th clutch for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between the clutch end-plate and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate If they are OK, adjust the clearance with the clutch end-plate
  • Check the 5th accumulator piston, the O-ring, and the spring in the accumulator body for wear and damage
Poor acceleration in D, S, and R, stall speed low, engine does not rev to high rpm, transmission does not upshift under hard acceleration
  1. Engine output low
  2. VTEC rocker arms defective
  3. Restricted intake
  4. Restricted exhaust
  5. Torque converter clutch piston defective
  • Check the stall speed
  • Check the engine control system
  • Check fuel pressure (see FUEL PRESSURE TEST )
  • Check for exhaust restriction
  • Check for intake restriction
  • Replace the torque converter
Engine idle vibration
  1. Low ATF level
  2. Engine output low
  3. Torque converter clutch piston defective
  • Check engine and transmission mounts
  • Check the ATF level, and check the ATF cooler line for leaks and loose connections If necessary, clean the ATF cooler lines
  • Check the stall speed (see STALL SPEED TEST )
  • Check the engine control system
  • Check the line pressure (see PRESSURE TEST )
  • Improper alignment of the ATF pump and the torque converter housing may cause ATF pump seizure The symptoms are mostly an rpm-related ticking noise or a high pitched squeak
Vehicle moves in N
  1. Excessive ATF
  2. ATF temperature sensor defective
  3. Foreign material in separator plate orifice
  4. Relief valve defective
  5. Reverse control valve defective
  6. Lubrication control valve defective
  7. 1st-hold clutch defective
  8. 1st clutch defective
  9. 2nd clutch defective
  10. 3rd clutch defective
  11. 4th clutch defective
  12. 5th clutch defective
  13. Clearance between clutch end-plate and top disc incorrect
  14. Needle bearing seized, worn, or damaged
  15. Thrust washer seized, worn or damaged
  • Check the ATF level, and drain the ATF if it is over-filled
  • Check the ATF temperature sensor O-ring for wear and damage
  • Check the stall speed (see STALL SPEED TEST )
  • Check all clutch pressures
  • Check for a clogged orifice in the separator plate If the orifice is clogged, remove it and clean the separator plate orifice
  • Check the relief valve and lubrication control valve in the main valve body for free movement, and check the valve springs for wear and damage
  • Check the reverse control valve in the secondary valve body for free movement, and check the valve spring for wear and damage
  • Inspect all clutches for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between the clutch end-plate and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate If they are OK, adjust the clearance with the clutch end-plate
  • Check the needle bearings and the thrust washers on all shafts for seizure, wear, and damage
Late shift after shifting from N to D or S, or excessive shock when shifting
  1. Shift solenoid valve A defective
  2. Shift solenoid valve B defective
  3. Shift solenoid valve C defective
  4. A/T clutch pressure control solenoid valve C defective
  5. Shift cable broken or out of adjustment
  6. Connection between shift cable and transmission or shift lever is worn
  7. ATF temperature sensor defective
  8. CPC valve C stuck
  9. ATF strainer clogged
  10. Foreign material in separator plate orifice
  11. Shift valve A defective
  12. Shift valve D defective
  13. Servo control valve defective
  14. 1st accumulator defective
  15. 2nd accumulator defective
  16. 1st check ball stuck
  17. 1st clutch defective
  18. Clearance between clutch end-plate and top disc incorrect
  • Check engine and transmission mounts
  • Check for a stored DTC, and check for loose connections
  • Test the shift solenoid valves with the HDS (see SHIFT SOLENOID VALVE TEST, REPLACEMENT, AND SHIFT SOLENOID WIRE HARNESS REPLACEMENT )
  • Check for a seized shift solenoid valve, and inspect the O-rings
  • Test the /VT clutch pressure control solenoid valves with the HDS (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A AND B TEST )
  • Check the stall speed (see STALL SPEED TEST )
  • Check the line and 1st clutch pressure (see PRESSURE TEST )
  • Inspect the A/T clutch pressure control solenoid valve body gasket, the ATF feed pipes, and the O-rings for wear and damage
  • Check for a loose shift cable at the shift lever and the transmission control lever
  • Inspect the ATF temperature sensor O-ring for wear and damage
  • Check for a clogged orifice in the separator plate If the orifice is clogged, remove it and clean the separator plate orifice
  • Check the ATF strainer for debris If the strainer is clogged, find the damaged components that caused the debris If no cause for contamination is found, replace the torque converter
  • Check CPC valve C in the secondary valve body for free movement, and check the valve spring for wear and damage
  • Check shift valve A in the main valve body for free movement, and check the valve spring for wear and damage
  • Check shift valve D in the secondary valve body for free movement, and check the valve spring for wear and damage
  • Inspect the 1st clutch for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between the clutch end-plate and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate If they a re OK, adjust the clearance with the clutch end-plate
  • Check the 1st and 2nd accumulator pistons, the O-rings, and the springs in the accumulator body for wear and damage
  • Check for a stuck 1st check ball in the secondary valve body
Late shift after shifting from N to R, or excessive shock when shifting
  1. Worn or damaged engine or transmission mounts
  2. A/T clutch pressure control solenoid valve C defective
  3. Shift cable broken or out of adjustment
  4. Connection between shift cable and transmission or shift lever is worn
  5. ATF temperature sensor defective
  6. Reverse CPC valve defective
  7. ATF strainer clogged
  8. Foreign material in separator plate orifice
  9. 5th clutch defective
  • Check engine and transmission mounts
  • Check for a stored DTC, and check for loose connections
  • Test the A/T clutch pressure control solenoid valve C with the HDS (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C TEST )
  • Inspect the A/T clutch pressure control solenoid valve body gasket, the ATF feed pipes, and the O-rings for wear and damage
  • Check for a loose shift cable at the shift lever and the transmission control lever
  • Check the stall speed (see STALL SPEED TEST )
  • Check the line pressure and 5th clutch pressure (see PRESSURE TEST )
  • Check the ATF strainer for debris If the strainer is clogged, find the damaged components that caused the debris If no cause for contamination is found, replace the torque converter
  • Inspect the ATF temperature sensor O-ring for wear and damage
  • Check for a clogged orifice in the separator plate If the orifice is clogged, remove it and clean the separator plate orifice
  • Inspect the 5th clutch for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between the clutch end-plate and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate If they are OK, adjust the clearance with the clutch end-plate
Transmission does not shift
  1. Input shaft (mainshaft) speed sensor defective
  2. Output shaft (countershaft) speed sensor defective
  3. Engine output low
  • Check for a stored DTC, and check for loose connections
  • Check the speed sensor installation
  • Inspect the sensor O-ring for wear and damage
  • Check for exhaust restrictions
  • Check for intake restrictions
  • Check fuel pressure
Excessive shock or flares on all upshifts and downshifts
  1. Worn or damaged engine or transmission worn
  2. Input shaft (mainshaft) speed sensor defective
  3. Output shaft (countershaft) speed sensor defective
  4. ATF temperature sensor defective
  5. Foreign material in separator plate orifice
  • Check engine and transmission mounts
  • Check for a stored DTC, and check for loose connections
  • Check the speed sensor installation
  • Inspect the sensor O-ring for wear and damage
  • Check for a clogged orifice in the separator plate If the orifice is clogged, remove it and clean the separator plate orifice
Excessive shock or flares on 1-2 upshift or 2-1 downshift
  1. Worn or damaged engine or transmission mounts
  2. Shift solenoid valve A defective
  3. Shift solenoid valve B defective
  4. Shift solenoid valve C defective
  5. A/T clutch pressure control solenoid valve A defective
  6. A/T clutch pressure control solenoid valve B defective
  7. A/T clutch pressure control solenoid valve C defective
  8. 2nd clutch transmission fluid pressure switch defective
  9. CPC valve A defective
  10. CPC valve B defective
  11. CPC valve C defective
  12. Shift valve C defective
  13. Shift valve D defective
  14. Foreign material in separator plate orifice
  15. 2nd accumulator defective
  16. 2nd clutch defective
  • Check engine and transmission mounts
  • Check for a stored DTC, and check for loose connections
  • Test the 2nd clutch transmission fluid pressure switch operation with the HDS
  • Inspect the shift solenoid valve function with the HDS (see SHIFT SOLENOID VALVE TEST, REPLACEMENT, AND SHIFT SOLENOID WIRE HARNESS REPLACEMENT )
  • Check for a seized shift solenoid valve, and inspect the O-rings
  • Inspect the A/T clutch pressure control solenoid valve A or B with the HDS (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A AND B TEST )
  • Inspect the A/T clutch pressure control solenoid valve C with the HDS (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C TEST )
  • Check the 2nd clutch pressure (see PRESSURE TEST )
  • Inspect the A/T clutch pressure control solenoid valve body gasket, the ATF feed pipes, and the O-rings for wear and damage
  • Check for a clogged orifice in the separator plate If the orifice is clogged, remove it and clean the separator plate orifice
  • Check CPC valve A in the main valve body for free movement, and check the valve spring for wear and damage
  • Check CPC valves B and C in the secondary valve body for free movement, and check the valve springs for wear and damage
  • Check shift valves C and D in the secondary valve body for free movement, and check the valve springs for wear and damage
  • Inspect the 2nd clutch for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between the clutch end-plate and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate If they are OK, adjust the clearance with the clutch end-plate
  • Check the 2nd accumulator piston, the O-ring, and the spring in the accumulator body for wear and damage
Excessive shock or flares on 2-3 upshift or 3-2 downshift
  1. Worn or damaged engine or transmission mounts
  2. Shift solenoid valve D defective
  3. A/T clutch pressure control solenoid valve A defective
  4. A/T clutch pressure control solenoid valve B defective
  5. A/T clutch pressure control solenoid valve C defective
  6. 3rd clutch transmission fluid pressure switch defective
  7. Shift fork shaft stuck
  8. Servo control valve defective
  9. CPC valve A defective
  10. CPC valve B defective
  11. Lock-up shift valve defective
  12. Foreign material in separator plate orifice
  13. 2nd accumulator defective
  14. 3rd accumulator defective
  15. 2nd check ball stuck
  16. 2nd clutch defective
  17. 3rd clutch defective
  18. Clearance between clutch end-plate and top disc incorrect
  • Check engine and transmission mounts
  • Check for a stored DTC, and check for loose connections
  • Test the 3rd clutch transmission fluid pressure switch operation with the HDS
  • Inspect the shift solenoid valve function with the HDS (see SHIFT SOLENOID VALVE TEST, REPLACEMENT, AND SHIFT SOLENOID WIRE HARNESS REPLACEMENT )
  • Inspect the A/T clutch pressure control solenoid valve A or B with the HDS (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A AND B TEST )
  • Inspect the A/T clutch pressure control solenoid valve C with the HDS (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C TEST )
  • Check for a seized shift solenoid valve, and inspect the O-rings
  • Check the 2nd and 3rd clutch pressures (see PRESSURE TEST )
  • Inspect the A/T clutch pressure control solenoid valve body gasket, the ATF feed pipes, and the O-rings for wear and damage
  • Check for a missing shift fork bolt on the shift fork shaft
  • Check the shift fork shaft detent for wear and damage
  • Check for a stuck servo valve in the regulator valve body, and check the O-ring for wear and damage
  • Check the servo control valve, CPC valve A, and the lock-up shift valve in the main valve body for free movement, and check the valve springs for wear and damage
  • Check for a clogged orifice in the separator plate If the orifice is clogged, remove it and clean the separator plate orifice
  • Check CPC valve B in the secondary valve body for free movement, and check the valve spring for wear and damage
  • Inspect the 2nd and 3rd clutches for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between the clutch end-plate and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate If they are OK, adjust the clearance with the clutch end-plate
  • Check the 2nd and 3rd accumulator pistons, the O-rings, and the springs in the accumulator body for wear and damage
  • Check for a stuck 2nd check ball in the secondary valve body
Excessive shock or flares on 3-4 upshift or 4-3 downshift
  1. Worn or damaged engine or transmission mounts
  2. A/T clutch pressure control solenoid valve A defective
  3. A/T clutch pressure control solenoid valve B defective
  4. A/T clutch pressure control solenoid valve C defective
  5. 4th clutch transmission fluid pressure switch defective
  6. Shift fork shaft stuck
  7. Servo control valve defective
  8. Foreign material in separator plate orifice
  9. 3rd accumulator defective
  10. 4th accumulator defective
  11. 3rd clutch defective
  12. 4th clutch defective
  13. Clearance between clutch end-plate and top disc incorrect
  • Check engine and transmission mounts
  • Check for a stored DTC, and check for loose connections
  • Test the 4th clutch transmission fluid pressure switch operation with the HDS
  • Inspect the A/T clutch pressure control solenoid valve A or B with the HDS (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A AND B TEST )
  • Inspect the A/T clutch pressure control solenoid valve C with the HDS (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C TEST )
  • Check the 3rd and 4th clutch pressures (see PRESSURE TEST )
  • Inspect the A/T clutch pressure control solenoid valve body gasket, the ATF feed pipes, and the O-rings for wear and damage
  • Check for a missing shift fork bolt on the shift fork shaft
  • Check the shift fork shaft detent for wear and damage
  • Check for a stuck servo valve in the regulator valve body, and check the O-ring for wear and damage
  • Check the servo control valve in the main valve body for free movement, and check the valve spring for wear and damage
  • Check for a clogged orifice in the separator plate If the orifice is clogged, remove it and clean the separator plate orifice
  • Inspect the 3rd and 4th clutches for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between the clutch end-plate and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate If they are OK, adjust the clearance with the clutch end-plate.
  • Check the 3rd and 4th accumulator pistons, the O-rings, and the springs in the accumulator body for wear and damage
Excessive shock or flares on 4-5 upshift or 5-4 downshift
  1. A/T clutch pressure control solenoid valve A defective
  2. A/T clutch pressure control solenoid valve B defective
  3. A/T clutch pressure control solenoid valve C defective
  4. Foreign material in separator plate orifice
  5. 4th accumulator defective
  6. 5th accumulator defective
  7. 4th clutch defective
  8. 5th clutch defective
  9. Clearance between clutch end-plate and top disc incorrect
  • Check for a stored DTC, and check for loose connections
  • Test the A/T clutch pressure control solenoid valve A or B with the HDS (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A AND B TEST )
  • Check the stall speed in R (see STALL SPEED TEST )
  • Check the 4th and 5th clutch pressures (see PRESSURE TEST )
  • Inspect the A/T clutch pressure control solenoid valve C with the HDS (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C TEST )
  • Inspect the A/T clutch pressure control solenoid valve body gasket, the ATF feed pipes, and the O-rings for wear and damage
  • Check for a clogged orifice in the separator plate If the orifice is clogged, remove it and clean the separator plate orifice
  • Inspect the 4th and 5th clutches for wear and damage
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings Check the spring retainer for wear and damage Inspect the clearance between the clutch end-plate and the top disc If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height If the discs and the plates are worn or damaged, replace them as a set If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate If they are OK, adjust the clearance with the clutch end-plate
  • Check the 4th and 5th accumulator pistons, the O-rings, and the springs in the accumulator body for wear and damage
Noise from transmission in all shift lever positions
  1. ATF pump worn or binding
  2. ATF strainer clogged
  3. Mainshaft, countershaft, secondary shaft, and intermediary shaft bearings worn or damaged
  4. Idler gears worn or damaged
  5. Thrust washer seized, worn, or damaged
  • Check the line pressure (see PRESSURE TEST )
  • Improper alignment of the ATF pump and torque converter housing may cause ATF pump seizure The symptoms are mostly an rpm-related ticking noise or a high pitched squeak
  • Check the ATF strainer for debris If the strainer is clogged, find the damaged components that caused the debris If no cause for contamination is found, replace the torque converter
  • Inspect the differential pinion gears for wear If the differential pinion gears are worn, replace the differential assembly, replace the ATF strainer, thoroughly clean the transmission, and clean the cooler and lines
  • Replace the torque converter
  • Be careful not to damage the torque converter housing when replacing the main ball bearing You may also damage the ATF pump when you torque down the main valve body This will cause ATF pump seizure, use the proper tools
  • Install the main seal flush with the torque converter housing If you push it into the torque converter housing until it bottoms out, it will block the fluid return passage and result in damage
  • Inspect the countershaft and the secondary shaft for wear and damage
  • Inspect the park mechanism at the park lever link, park gear, and 2nd gears
  • Inspect the mainshaft, the countershaft, the secondary shaft, the intermediary shaft, and idler gears for wear and damage
  • Check the thrust washers on all shafts for seizure, wear, and damage
Vehicle does not accelerate above 31 mph (50 km/h) Torque converter one-way clutch defective
Vibration in all shift lever positions
  1. Drive plate defective or transmission misassembled
  2. Torque converter defective
  3. ATF pump worn or binding
  • Check for a misassembled transmission, and check the drive plate for wear and damage Replace the drive plate if it is worn or damaged
  • Check the stall speed
  • Check the line pressure
  • Improper alignment of ATF pump and the torque converter housing may cause ATF pump seizure The symptoms are mostly an rpm-related ticking noise or a high pitched squeak
  • Inspect the differential pinion gears for wear If the differential pinion gears are worn, replace the differential assembly, replace the ATF strainer, thoroughly clean the transmission, and clean the cooler and lines
  • Replace the torque converter
  • Be careful not to damage the torque converter housing when replacing the main ball bearing You may also damage the ATF pump when you torque down the main valve body This will cause ATF pump seizure, use the proper tools
Shift lever does not operate smoothly
  1. Transmission range switch defective or out of adjustment
  2. Shift cable broken, binding, or out of adjustment
  3. Shift lever mechanism worn or defective
  4. Connection between shift cable and transmission or shift lever is worn
  5. Manual valve defective
  6. Selector control shaft worn or damaged
  • Check for a stored DTC, and check for loose connections
  • Inspect the transmission range switch If the transmission range switch fails the inspection, replace the switch If the inspection is OK, check for proper transmission range switch installation, and adjust the shift cable
  • Check for a loose shift cable at the shift lever and the selector control lever
  • Check the manual valve in the main valve body for wear and damage, and check the manual lever guide pin for wear and damage
Transmission does not shift into P
  1. Shift cable broken, binding, or out of adjustment
  2. Connection between shift cable and transmission or shift lever is worn
  3. Park mechanism defective 4 Secondary shaft 2nd gear worn or damaged
  • Check for a loose shift cable at the shift lever and the selector control lever
  • Inspect the countershaft and the secondary shaft for wear and damage
  • Inspect the park mechanism at the park lever link, park gear, and 2nd gears
Engine stalls, idles low or rough
  1. Shift solenoid valve D defective
  2. A/T clutch pressure control solenoid valve C defective
  3. Torque converter clutch piston defective
  4. Lock-up shift valve defective
  5. Lock-up control valve defective
  6. Lock-up timing valve defective
  • Check for a stored DTC, and check for loose connections
  • Inspect the shift solenoid valve D function with the HDS (see SHIFT SOLENOID VALVE TEST, REPLACEMENT, AND SHIFT SOLENOID WIRE HARNESS REPLACEMENT )
  • Inspect the A/T clutch pressure control solenoid valve C with the HDS (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C TEST )
  • Check for a seized shift solenoid valve, and inspect the O-rings
  • Inspect the A/T clutch pressure control solenoid valve body gasket, the ATF feed pipes, and the O-rings for wear and damage
  • Replace the torque converter
  • Check the lock-up shift valve and the lock-up timing valve in the main valve body for free movement, and check the valve springs for wear and damage
  • Check the lock-up control valve in the regulator valve body for free movement, and check the valve spring for wear and damage
Torque converter clutch does not operate smoothly, torque converter clutch does not disengage
  1. Shift solenoid valve D defective
  2. A/T clutch pressure control solenoid valve C defective
  3. Torque converter clutch piston defective
  4. Torque converter check valve defective
  5. Lock-up shift valve defective
  6. Lock-up control valve defective
  7. Lock-up timing valve defective
  • Check for a stored DTC, and check for loose connections
  • Inspect the shift solenoid valve D function with the HDS (see SHIFT SOLENOID VALVE TEST, REPLACEMENT, AND SHIFT SOLENOID WIRE HARNESS REPLACEMENT )
  • Inspect the A/T clutch pressure control solenoid valve C with the HDS (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C TEST )
  • Check for a seized shift solenoid valve, and inspect the O-rings
  • Check the line pressure (see PRESSURE TEST )
  • Inspect the A/T clutch pressure control solenoid valve body gasket, the ATF feed pipes, and the O-rings for wear and damage
  • Replace the torque converter
  • Check the torque converter check valve, the lockup shift valve, and the lock-up timing valve in the main valve body for free movement, and check the valve springs for wear and damage
  • Check the lock-up control valve in the regulator valve body for free movement, and check the valve spring for wear and damage
Torque converter clutch does not engage
  1. Shift solenoid valve D defective
  2. A/T clutch pressure control solenoid valve C defective
  3. Input shaft (mainshaft) speed sensor defective
  4. Output shaft (countershaft) speed sensor defective
  5. Shift cable broken or out of adjustment
  6. Connection between shift cable and transmission or shift lever is worn
  7. Foreign material in separator plate orifice
  8. Torque converter clutch piston defective
  9. Torque converter check valve defective
  10. Lock-up shift valve defective
  11. Lock-up control valve defective
  12. Lock-up timing valve defective
  • Check for a stored DTC, and check for loose connections
  • Inspect the shift solenoid valve D function with the HDS (see SHIFT SOLENOID VALVE TEST, REPLACEMENT, AND SHIFT SOLENOID WIRE HARNESS REPLACEMENT )
  • Inspect the A/T clutch pressure control solenoid valve C with the HDS (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C TEST )
  • Check for a seized shift solenoid valve, and inspect the O-rings
  • Check the line pressure (see PRESSURE TEST )
  • Inspect the A/T clutch pressure control solenoid valve body gasket, the ATF feed pipes, and the O-rings for wear and damage
  • Check for a loose shift cable at the shift lever and the transmission control lever
  • Check for a clogged orifice in the separator plate If the orifice is clogged, remove it and clean the separator plate orifice
  • Check the output shaft sensor installation (countershaft) speed
  • Inspect the sensor O-ring for wear and damage
  • Replace the torque converter
  • Check the torque converter check valve and the lock-up shift valve in the main valve body for free movement, and check the valve springs for wear and damage
  • Check the lock-up control valve in the regulator valve body for free movement, and check the valve spring for wear and damage
A/T gear position indicator does not indicate shift lever positions
  1. Transmission range switch defective or out of adjustment
  2. Shift cable broken or out of adjustment
  3. Connection between shift cable and transmission or shift lever is worn
  • Check for a stored DTC, and check for loose connections
  • Inspect the transmission range switch If the transmission range switch fails the inspection, replace the switch If the inspection is OK, check for proper transmission range switch installation, and adjust the shift cable
  • Check for a loose shift cable at the shift lever and the selector control lever
Speedometer and odometer do not work Output shaft (countershaft) speed sensor defective
  • Check for a stored DTC, and check for loose connections
  • Check the speed sensor installation
  • Inspect the sensor O-ring for wear and damage
Engine does not rev to high rpm, and the transmission upshifts at low rpm (engine at normal operating temperature) VTEC rocker arms defective
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