For 1990-2009 cars only
Important Preliminary Checks Before Starting
Perform the Powertrain On Board Diagnostic (OBD) System Check before using the Symptom Tables, and verify that all of the following conditions are true:
| • | The 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/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, cellular phones, etc. |
- 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 |
