Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Trouble Code Display
After diagnostic mode is entered, all trouble codes stored in memory will be displayed. All ECM codes are prefixed with an "E" (i.e. E013, E014, etc.). Lowest numbered ECM codes will be displayed first, followed by higher numbered codes. If no ECM codes are stored, a "NO ECM CODES" message will be displayed.
Following the highest numbered ECM code or the "NO ECM CODES" message, the BCM codes will be displayed. All BCM codes are prefixed with a "B" (I.E. B013, B014, etc.) and displayed in ascending order as with ECM codes. If no BCM codes are stored, a "NO BCM CODES" message will be displayed.
Any ECM codes will also be accompanied by the words "CURRENT" or "HISTORY". A "history" code indicates an intermittent failure, a "current" code indicates that fault still exists (current failure). If "LO" button on CCDIC is pressed, at any time DURING display of trouble codes, the display of trouble codes will be by-passed.
If no trouble codes are present, diagnosis of the DFI system may be performed using either of 2 methods. Proceed to SYMPTOM DIAGNOSIS to diagnose DFI system using noticeable driveability symptoms, or proceed to appropriate DFI PERFORMANCE CHART to determine further action to diagnose a specific suspected DFI subsystem.
| Code | Test Condition |
|---|---|
| EO12 | No Distributor (Tach) Signal |
| EO13 | Oxygen Sensor Not Ready |
| EO14 | Shorted Coolant Sensor Circuit |
| EO15 | Open Coolant Sensor Circuit |
| EO16 | Alternator Voltage Out Of Range |
| EO18 | Open Crank Signal Circuit |
| EO19 | Shorted Fuel Pump Circuit |
| EO20 | Open Fuel Pump Circuit |
| EO21 | Shorted TPS Circuit |
| EO22 | Open TPS Circuit |
| EO23 | EST/By-Pass Circuit |
| EO24 | Vehicle Speed Sensor Circuit |
| EO26 | Shorted Throttle Switch Circuit |
| EO27 | Open Throttle Switch Circuit |
| EO28 | Open 3rd-4th Gear Switch Circuit |
| EO30 | ISC Circuit |
| EO31 | Shorted MAP Sensor Circuit |
| EO32 | Open MAP Sensor Circuit |
| EO34 | MAP Sensor Signal High |
| EO37 | Shorted MAT Sensor Circuit |
| EO38 | Open MAT Sensor Circuit |
| EO39 | VCC Engagement Problem |
| EO40 | Open Power Steering Pressure Sw. Circuit |
| EO44 | Lean Exhaust Signal |
| EO45 | Rich Exhaust Signal |
| EO47 | BCM/ECM Data Problem |
| EO48 | EGR System Fault |
| EO52 | ECM Memory Reset Indicator |
| EO53 | Distributor Signal Interrupt |
| EO55 | TPS Misadjusted |
| EO59 | VCC Temperature Sensor Circuit Problem |
| EO60 | Cruise Control/Transmission Not In Drive |
| EO63 | Vehicle Speed/Set Speed Difference Too High |
| EO64 | Cruise Control/Acceleration Too High |
| EO65 | Cruise Control/Coolant Temp. Too High |
| EO66 | Cruise Control/Engine RPM Too High |
| EO67 | Cruise Control Switch Shorted |
| Chart | Test Condition |
|---|---|
| DFI SYSTEM CHECK | DFI System |
| A1 | "ENGINE CONTROL SYSTEM" Light Inoperative |
| A2 | "ENGINE CONTROL SYSTEM" Light On |
| A3 | No Start Or Stall After Start |
| A4A | Fuel System Diagnosis |
| A4B | Fuel Pressure Out Of Range |
| A5 | Injector System Diagnosis |
| A6 | Oxygen Sensor Not Ready |
| A7 | Lean Exhaust Diagnosis |
| A8 | Rich Exhaust Diagnosis |
| A9 | Oxygen Sensor Diagnosis |
| C1 | ECM Replacement Check |
| C3 | Canister Purge Diagnosis |
| C4 | EST System Check |
| C6 | AIR Management Diagnosis |
| C7 | EGR Diagnosis |
| C8 | VCC Diagnosis |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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