A Important Preliminary Checks

Before using this, perform the Powertrain On-Board diagnostic (OBD) System Check to verify the following items: Initial Inspection and Diagnostic Overview
^ The PCM and MIL (Service Engine Soon) are operating correctly.
^ There are no DTCs stored.
^ Ensure that the engine coolant temperature is not above 130°C (266°F). This will cause the PCM to operate in the Engine Metal Overtemp mode. While in this state, the PCM will turn OFF four cylinders at a time to prevent the engine coolant temperature from reaching damaging levels. Engine Metal Overtemp can be perceived as a lack of power, engine miss, or rough idle. If the engine is operating in the Engine Metal Overtemp mode, refer to DTC P1258 Engine Coolant Overtemperature - Protection Mode Active. Testing and Inspection
^ Scan tool data is within the normal operating range.
^ Verify the customers complaint to reference the correct symptom table.