A Important Preliminary Checks

Perform the A 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.
^ Ensure that 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 four 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.
^ The scan tool data is within the normal operating range. Refer to Engine Scan Tool Data List.
^ Verify the customer concern and locate the correct symptom in the table of contents. Check the items indicated under that symptom.