Diagnostic Test
- DTC IS ACTIVE NOTE: This DTC will set if the Engine Control Module (ECM) receives a message from the TIPM indicating that a PTC Heater Relay DTC is present.
- Ignition on, engine not running.
- With the scan tool, Clear DTCs in the Engine Control Module (ECM).
- With the scan tool, actuate the PTC Heater Relay 2.
- With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
- Go to Step 2.
No
- Refer to the CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. Refer to CHECKING FOR AN INTERMITTENT DTC, PCM VERIFICATION TEST, PCM/TCM PROGRAMMING & PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE (GAS) .
- ENGINE CONTROL MODULE (ECM)
- With the scan tool, select View DTCs in the TIPM.
Is there a stored or active PTC Heater Relay DTC present in the TIPM?
Yes
- Refer to HVAC - ELECTRICAL DIAGNOSTICS for diagnostic procedures and for further possible causes. Refer to DTC-Based Diagnostics/HVAC - Diagnosis and Testing .
No
- Replace the Engine Control Module (ECM) in accordance with the Service Information.
- Perform the ECM Verification Test.
- With the scan tool, select View DTCs in the TIPM.