A Important Preliminary Checks

Perform the A 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 DTC(s) stored.
^ Ensure the engine is not in a torque reduction mode. The PCM turns certain injectors off and/or reduces the engine timing when the PCM detects an over torque condition or an abusive maneuver. Refer to Powertrain Control Module Description for further information.
^ 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 engine temperatures from reaching damaging levels. The system perceives Engine Coolant Over Temperature as a lack of power, miss, or 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 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.