For 1990-2009 cars only
Important Preliminary Checks Before Starting
Perform Powertrain On Board Diagnostic (OBD) System Check before using the Symptom Tables, and verify all of the following are true:
| • | The PCM and MIL (Service Engine Soon) are operating correctly. |
| • | There are no DTCs stored. |
| • | Ensure that the engine coolant temperature is not above 132°C (270°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 fuel off to four cylinders at a time to keep engine temperatures from reaching damaging levels. The customer perceives Engine Coolant Over temperature-Fuel Disabled Mode as a lack of power, miss, or rough idle. If the engine operates in Engine Coolant Over temperature-Fuel Disabled Mode, refer to Engine Overheating in Engine Cooling. |
| • | The scan tool data is within the normal operating range. |
| • | Verify the customers 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 thorough Visual/Physical inspection. This step is extremely important - it can lead to correcting a condition without further inspections and can save valuable time. |
| • | If the condition exists as a start and stall, search for DTCs related to the vehicle theft deterrent system. Inspect for improper installation of electrical options such as lights, cellular phones etc. |
| • | Use the following tables when diagnosing a symptom concern. |
| • | If you cannot isolate the condition with the appropriate table, refer to Intermittent Conditions for further diagnosis. |
| - | Backfire |
