Diagnostic Test

1) ACTIVE DTC
NOTE: For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.

NOTE: Diagnose and repair any related sensor or communication DTCs in the Anti-Lock Brake Module before continuing with this test.

Start the engine and allow it to reach operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes
1. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article for diagnostic procedures and for further possible causes.
No
1. Refer to the *CHECKING FOR AN INTERMITTENT DTC . Refer to DIAGNOSIS AND TESTING .
2. Perform PCM VERIFICATION TEST .