For 1990-2009 cars only
Important Preliminary Checks Before Starting
Perform the Diagnostic System Check - Engine Controls before using the Symptom Tables, and verify that all of the following conditions are true:
| • | The powertrain control module (PCM) and the malfunction indicator lamp (MIL) are operating correctly. |
| • | There are no DTCs stored. |
| • | The engine coolant temperature is not above 130°C (266°F). |
| This condition causes the PCM to operate in Engine Coolant Over Temperature/Fuel Disabled Mode. While in Engine Coolant Over Temperature/Fuel Disabled Mode, the PCM turns the fuel OFF to 4 cylinders at a time in order to keep the engine temperatures from reaching damaging levels. The system perceives Engine Coolant Over Temperature as a lack of power, a miss, or a rough idle. If the vehicle is operating in Engine Coolant Over Temperature/Fuel Disabled Mode, refer to Engine Overheating in Engine Cooling for diagnosis. |
| • | The scan tool data is within the normal operating range. |
| Refer to Scan Tool Data List . |
| • | Verify the customer concern and locate the correct symptom in the table of contents. Inspect the items indicated under that symptom. |
| • | Several of the symptom procedures ask for a careful visual and physical check. This step is extremely important, and can lead to correcting a problem without further checks and can save valuable time. |
| • | If the intermittent condition exists as a start and then a stall, inspect for any DTCs relating to the theft deterrent system. Verify the proper installation of electrical options such as lights and cellular phones. |
- Use the following tables when diagnosing a symptom concern:
- If the condition cannot be isolated using the appropriate table, refer to Intermittent Conditions for further diagnosis.
| • | Backfire |
