- Important Preliminary Checks

Important Preliminary Checks Before Starting

Before using this section, perform the Powertrain On-Board Diagnostic (OBD) System Check and verify all of the following items: Testing and Inspection

^ The PCM and MIL (Service Engine Soon) are operating correctly.

^ There are no DTC(s) stored.

^ Ensure that the engine coolant temperature is not above 130°C (266°F). This condition will cause the PCM to operate in Engine Metal Overtemp. While in Engine Metal Overtemp, the PCM will turn fuel off to four cylinders at a time to keep engine temperatures from reaching damaging levels. Engine Metal Overtemp will be perceived as a lack of power, miss, or rough idle. If the vehicle is operating in Engine Metal Overtemp, refer to Cooling System.

^ Scan tool data is within normal operating range, Refer to Typical Scan Data Values.

^ Verify the customer complaint and locate the correct symptom under this heading. Perform the procedure included in the symptom chart.