A Important Preliminary Checks

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

^ 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.
^ Scan tool data is within normal operating range.
An example of incorrect scan data would be an indication of the extended travel brake switch always applied. With this condition the PCM may operate the engine in a torque reduction mode at higher throttle angles. The torque reduction mode may cause a driveability concern. This condition may not set a DTC.
^ Verify the customer complaint and locate the correct symptom in the table of contents. Perform the procedure included in the symptom chart.