Engine Performance: System: Self-Diagnostics

• Introduction
  • Notes
  • Fuel Delivery & Control
  • Air Induction
  • Data Sensors
    • Notes
    • Manifold Air Temperature (MAT) Sensor
    • Coolant Temperature Sensor (CTS)
    • Manifold Absolute Pressure (MAP) Sensor
    • Throttle Position Sensor (TPS)
    • Vehicle Speed Sensor (VSS)
    • Oxygen Sensor (O2)
    • Engine speed Sensor
  • Electronic Control Module (ECM)
    • Notes
    • Input/Output Devices
    • Central Processing Unit (CPU)
    • Power Supply
    • Memories
  • Body Control Module (BCM)
  • Electronic Spark Timing (Est)
  • Idle Speed Control (ISC)
  • Emissions Control
  • Closed Loop Fuel Control
  • Cruise Control
  • Diagnostic System
    • Notes
    • Engine Malfunction Test
    • Data Display
    • Input Tests
    • Output Tests
• Self-Diagnostic System
  • Diagnostic Modes
    • Notes
    • Entering Diagnostic Mode
    • Retrieving Stored Trouble Codes
    • Entering Service Mode
    • Status Light Display
    • Exiting Diagnostic Mode
    • Clearing Trouble Codes
    • Data Display Procedure
    • Input Test Procedure
    • Output Test Procedure
    • Program Override
  • Trouble Code Display
• PFI System Check
• Self Diagnostics System Check
• Summary
• Diagnostic Trouble Code Definitions
• ECM Connector Identification
• Lighting Charts
  • Lighting System Check
  • Lighting Chart A-1
    • Note On Intermittents
  • Lighting Chart A-2: Data Circuit Problem
    • Notes
    • Note On Intermittent
  • Lighting Chart A-3: Code L202, L203 & L204 (1600 Power Circuit Problem)
  • Lighting Chart A-4: Code L206, L207 & L209 (1601 Power Circuit Problem)
  • Lighting Chart A-5: Code L205, L208 & L210 (1602 Power Circuit Problem)
  • Lighting Chart B-1: Code L202 Set With L203, L206 Or L210 (Addressing Problem)
  • Lighting Chart B-2 :Code L208 Set With L209 Or L210 (Address Problem)
  • Lighting Chart B-3: DTC L204 Set With L205 Or L206 (Address Problem)
  • Lighting Chart B-4A: Code L207 Set With L203, L205 Or L206 (Address Problem)
  • Lighting Chart B-4B: Code L207 Set With L202 Or L204 (Address Problem)
  • Lighting Code L010: Redundant Tail Light Relay Failure
  • Lighting Code L011: Redundant Tail Light Relay Failure
• Display Panel Charts
  • System Check Chart B-1
  • System Check Chart B-2
  • System Check Chart B-3
  • System Check Chart B-4
  • System Check Chart C-1
  • System Check Chart C-2
• Data Communication Circuit Charts
  • System Check Chart D-1: Data Circuit Problem (Analog Cluster)
  • System Check Chart D-2: Data Circuit Problem
• ECM Data Circuit Charts
  • System Check Chart A-1: Data Circuit Problem
  • System Check Chart A-2: Data Circuit Problem
  • ECM Chart A-2: Multiple Trouble Codes Stored Current (1 Of 2)
  • ECM Chart A-2: Multiple Trouble Codes Stored Current (2 Of 2)
  • ECM Chart A-3: Multiple Trouble Codes Stored Current
• PFI Charts "A" Charts
  • PFI Chart A-1: "Engine Control System Fault" Light Inoperative During Cranking
  • PFI Chart A-2: "Engine Control System Fault" Light On - No Codes Present
  • PFI Chart A-3: No Start Or Stall After Start
  • PFI Chart A-4A: Static Fuel Pressure Diagnosis
  • PFI Chart A-4B: Dynamic Fuel Pressure Diagnosis
  • PFI Chart A-5: Injector System Diagnosis
  • PFI Chart A-6: Right O2 Sensor Not Ready
  • PFI Chart A-7: Left O2 Sensor Not Ready
  • PFI Chart A-8: Right O2 Sensor Lean
  • PFI Chart A-9: Left O2 Sensor Lean
  • PFI Chart A-10: Right O2 Sensor Rich
  • PFI Chart A-11 Left O2 Sensor Rich
  • PFI Chart A-12: Right O2 Sensor Diagnosis
  • PFI Chart A-13: Left O2 Sensor Diagnosis
• PFI "C" (Component) Charts
  • PFI Chart C-1: ECM Replacement Check
  • PFI Chart C-3: Canister Purge Control Diagnosis
  • PFI Chart C-4: Est System Check
    • Notes
    • Notes On Fault Tree
  • PFI Chart C-6: Air Management Diagnosis
• Diagnostic Tests
  • Notes
  • ECM DTC EO12: No Distributor Reference Signal
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO13: Right O2 Sensor Not Ready
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO14: Shorted Coolant Sensor Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure Condition
    • Action Taken
  • ECM DTC EO15: Open Coolant Sensor Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO16: Charging System Voltage Out Of Range
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO17: Left O2 Sensor Not Ready
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO19: Shorted Fuel Pump Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO20: Open Fuel Pump Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO20-A: Fuel Fuse Blown
    • Notes On Intermittents
  • ECM DTC EO21: Shorted Throttle Position Sensor Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO22: Open TPS Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO23: Est Circuit Problem
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO24: Speed Sensor Circuit Problem
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO26: Shorted Throttle Switch Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure Condition
    • Action Taken
  • ECM DTC EO27: Open Throttle Switch Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure Condition
    • Action Taken
  • ECM DTC EO28: Open 3RD Gear Circuit (1 Of 2)
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO28: Open 3RD Gear Circuit (2 Of 2)
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO29: Shorted 3RD Gear Circuit
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO30: Idle Speed Control Circuit Problem
    • Notes On Intermittents
    • Test Conditions
    • Failure conditions
    • Action Taken
  • ECM DTC EO31: Shorted Map Sensor Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure conditions
    • Action Taken
  • ECM DTC EO32: Open Map Sensor Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure condition
    • Action Taken
  • ECM DTC EO34: Map Signal To High
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action taken
  • ECM DTC EO37: Shorted Mat Sensor Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO38: Open Mat Sensor Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO39: VCC Engagement Problem
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO40: Open Power Steering Pressure Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO41: No Cam Sensor Signal
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
  • ECM DTC EO42: Left O2 Sensor Lean
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO43: Left O2 Sensor Rich
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO44: Right O2 Sensor Lean
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO45: Right O2 Sensor Rich
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO46: Left To Right Bank Fueling Imbalance
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO47: ECM To BCM Data
    • Notes
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO48: EGR System Fault
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO49: Air Management System Fault
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO52: ECM Memory Reset
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO53: Distributor Signal Interrupted
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO55: TPS Out Of Adjustment
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO56: Open 4TH Gear Switch Circuit (1 Of 2)
    • Notes On Intermittents
    • Test Conditions
    • Failure Condition
    • Action Taken
  • ECM DTC EO56: Open 4TH Gear Switch Circuit (2 Of 2)
    • Test Conditions
    • Failure Condition
    • Action Taken
  • ECM DTC EO57: Shorted 4TH Gear Switch Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure Condition
    • Action Taken
  • ECM DTC EO59: VCC Temperature Sensor Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO60: Cruise Not In Drive
    • Notes On Intermittents
    • Test Conditions
    • Failure Condition
    • Action Taken
  • ECM DTC EO61: Cruise Vent Solenoid Circuit
    • Notes On Intermittents
    • Test Conditions
    • Failure Conditions
    • Action Taken
  • ECM DTC EO62: Cruise Vacuum Solenoid Circuit
    • Notes On Intermittents
    • Test Condition
    • Failure Conditions
    • Action Taken
  • ECM DTC EO63: Set Speed/Vehicle Speed Difference To High
    • Notes On Intermittents
    • Test Conditions
    • Failure Condition
    • Action Taken
  • ECM DTC EO64: Acceleration Too High Cruise Engaged
    • Notes On Intermittents
    • Test Conditions
    • Failure Condition
    • Action Taken
  • ECM DTC EO65: Cruise Servo Sensor Failure (1 Of 2)
    • Notes On Intermittents
    • Test Condition
    • Failure Condition
    • Action Taken
  • ECM DTC EO65: Cruise Servo Sensor Failure (2 Of 2)
  • ECM DTC EO66: Cruise Engine Rpm Too High
    • Test Conditions
    • Failure Condition
    • Action Taken
  • ECM DTC EO67: Cruise Set/Coast Or Resume/ACCEL Switch Shorted
    • Notes On Intermittents
    • Test Condition
    • Failure Condition
    • Action Taken
• Input Tests
  • ECM Input EI71: Brake Switch
    • Notes
    • Notes On Intermittents
  • ECM Input EI72: Throttle Switch Circuit
    • Notes
    • Notes On Intermittents
  • ECM Input EI74: Park/Neutral Circuit
    • Notes
    • Notes On Intermittents
  • ECM Input EI80: Third Gear Switch
    • Notes
    • Notes On Intermittents
  • ECM Input EI81: Fourth Gear Switch
    • Notes
    • Notes On Intermittents
  • ECM Input EI82: Cruise On/Off Switch
    • Notes
    • Notes On Intermittents
  • ECM Input EI83: Cruise Control Set/Coast Switch
    • Notes
    • Notes On Intermittents
  • ECM Input EI84: Cruise Control Resume/ACCEL Switch
    • Notes
    • Notes On Intermittents