Line Pressure Test

Perform the mechanical system test preparation. (See MECHANICAL SYSTEM TEST PREPARATION .)
Remove the air cleaner component. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
Remove the harness bracket.

Fig 1: Identifying Harness Bracket
Courtesy of MAZDA MOTORS CORP.
Remove the pressure detection square head plug.
WARNING:
- Do not remove the square head plug when the ATF temperature is high. Otherwise, ATF could overflow and cause severe burns or serious injury. Remove the square head plug when the transaxle and ATF temperatures are low.
NOTE:
- Use a suitable oil pressure gauge that corresponds to the line pressure because the maximum scale value differs depending on the oil pressure gauge.
Install SSTs (49 D019 908, 49 D019 909, 49 D019 910, 49 D019 911, 49 D019 913) to the line pressure detection port as shown in the figure.

Fig 2: Line Pressure Detection Port With Torque Specifications
Courtesy of MAZDA MOTORS CORP.

Fig 3: Installing To Line Pressure Detection Port
Courtesy of MAZDA MOTORS CORP.
Install the air cleaner component. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
Start the engine.
Warm up the engine until the ATF temperature is 60-70 °C {140-158 °F}.
Shift the selector lever to the D position.
Measure the line pressure while idling in D position.
Measure the line pressures while idling in the M (1st gear) and R positions using the same procedure.
Stop the engine.
Change the low-pressure gauge (49 D019 908) to the high-pressure gauge (49 D019 907).
Start the engine.
Measure the line pressure while stalling in D position.
1. Strongly depress the brake pedal with the left foot.
2. Shift the selector lever to the D position.
  CAUTION:
  - To prevent damage to the transaxle, measure the line pressure while stalling (Step (3)-(4)) within 5 s.
3. Slowly depress the accelerator pedal fully with the right foot all the way down.
4. Read the line pressure quickly while stalling, and remove the right foot from the accelerator pedal.
5. Shift the selector lever to the N position and idle for 1 min or more.

Measure the line pressure while stalling for positions other than D in the same procedure.

If there is any malfunction, one of the following causes may have occurred:

POSSIBLE CAUSE DESCRIPTION

Condition		Possible cause
Lower than specification	Lower in R, D, and M (1GR) position	Oil pump wear ATF leakage from oil pump, control valve body, and transaxle case Pressure regulator valve sticking Pressure control solenoid malfunction Solenoid reducing valve sticking
	Lower in D and M (1GR) position	ATF leakage from low clutch hydraulic circuit
	Lower in R and M (1GR) position	ATF leakage from low and reverse brake hydraulic circuit
	Lower in R position	ATF leakage from R-3-5 brake hydraulic circuit
Higher than specification	Higher in R, D, and M (1GR) position	Pressure regulator valve sticking Pressure control solenoid malfunction

LINE PRESSURE SPECIFICATION

Measurement conditions		Specification (kPa {kgf/cm² , psi})
Idling	R position	500-700 {5.10-7.13, 72.6-101.0}
Idling	D and M (1GR) position	330-470 {3.37-4.79, 47.9-68.1}
Stalling	R position	1, 790-2, 100 {18.26-21.41, 259.7-304.5}
Stalling	D and M (1GR) position	970-1, 170 {9.90-11.93, 141.0-169.6}

Stop the engine.
Remove the air cleaner component. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
Remove the SSTs.
WARNING:
- If the SST is removed when the ATF temperature is high, ATF could overflow and cause severe burns or serious injury. Remove the SST when the transaxle and ATF temperatures are low.
Install a new square head plug.
NOTE:
- Do not reuse the square head plug because a sealant coating has been applied.
Tightening torque 7.2-9.8 N.m {74-99 kgf.cm, 64-86 in.lbf}
Install the harness bracket.
Tightening torque 8-10 N.m {82-101 kgf.cm, 71-88 in.lbf}
Install the air cleaner component. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)

Fig 4: Identifying Harness Bracket
Courtesy of MAZDA MOTORS CORP.