A L L Diagnostic Trouble Codes ( DTC )
Testing and Inspection- Diagnostic Trouble Code Descriptions
- Manufacturer Code Charts
- Diagnostic Notes (Read Before Proceding)
- Code to Test Chart
- Driveability Tests - Trouble Codes
- 1A Checking System For Fault Codes - START HERE -
- 1B Output Circuits of Logic Module
- 1C Switch Inputs to Logic Module
- 1D Brake Switch Input Circuit
- 1E Park/Neutral Switch Input Circuit
- 1F A/C Push Button Switch Input Circuit
- 2A MAP Sensor Circuit (Codes 13 and/or 14)
- 2B Power Supply to MAP Sensor
- 2C MAP Sensor Signal Circuit Wire
- 3A Speed Sensor Circuit (Code 15)
- 3B Speed Sensor Circuit
- 3C Speed Sensor Circuit
- 4A Fault Code 21 Oxygen Sensor Circuit
- 4B Oxygen Sensor Circuit
- 5A Fault Code 22 Coolant Sensor Circuit
- 5B Coolant Sensor Wires
- 6A Throttle Position Sensor Circuit (Code 24)
- 6B Resistance Through Throttle Position Sensor
- 6C Throttle Position Wires to Logic Module
- 6D Throttle Position Wires to Logic Module
- 7A A.I.S. Control Circuit (Code 25)
- 7B A.I.S. Motor For Short to Ground
- 7C A.I.S. Control Circuit For Short
- 7D Fused J2 to Logic Module
- 8A Canister Purge Solenoid (Code 31)
- 8B Canister Purge Solenoid Control Circuit
- 8C Canister Purge Solenoid
- 9 Power Loss Lamp Circuit (Code 32)
- 10A A/C Cutout Relay (Code 33)
- 10B A/C Cutout Relay Control Circuit
- 10C A/C Cut Out Relay
- 11A Radiator Fan Relay Circuit (Code 35)
- 11B Radiator Fan Relay Control Circuit
- 11C Radiator Fan Relay
- 12 Shift Indicator Lamp Circuit (Code 37)
- 13A Sensor Calibrations (Engine Coolant)
- 13B Sensor Calibrations (Throttle Position)
- 13C Sensor Calibration (MAP Sensor)
- 14A Heated Air Intake System (Engine Cold)
- 14B Heated Air Intake System (Engine Warm)
- 15 Fuel Fouled Spark Plugs
- 16A EGR Valve
- 16B EGR Back Pressure Valve
- 16C EGR Valve Operation
- 16D EGR Valve Vacuum Chamber For Leaks
- 17 Secondary Ignition System
- 18A Basic Ignition Timing
- 18B Spark Advance
- 19A Fuel Supply & Return System
- 19B Low Fuel Pressure
- 19C Low Fuel Pressure
- 19D High Fuel Pressure
- 20 Battery Sensing Circuit (Code 16)
- 21A Charging System (Fault Codes 41 46 or 46)
- 21B Power Module Circuit
- 21C Control Wire to Power Module
- 22A Charging System (Codes 41 or 41 47)
- 22B Charging System Field Circuit
- 22C Control Wire to the Power Module
- 22D Power Module Circuit
- 22E Voltage to Alternator Field
- 23A Battery Temperature Circuit (Code 44)
- 23B Battery Temperature Sensor For Shorts
- 23C Battery Temperature Sensor For Opens
- 24A Sensor Calibrations (Engine Coolant)
- 24B Sensor Calibrations (Throttle Position)
- 24C Sensor Calibrations (MAP Sensor)
- 25A Automatic Idle Speed Motor Operation
- 25B Automatic Idle Speed Motor
- 25C Wires to Logic Module
- 26 Logic Module Controlled Components
- 27A Switch Inputs to the Logic Module
- 27B Brake Switch Circuit
- 27C Park/Neutral Switch Circuit
- 27D A/C Switch Circuit
- 28 Driveability Problems Not Related to Engine Controls
- Heating and Air Conditioning