Pinpoint Test H: The Tachometer Is Inoperative (Analog IPC (Instrument Panel Cluster))

Normal Operation and Fault Conditions
See Tachometer. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

If the IPC does not receive the engine rpm data from the PCM for 5 seconds or longer, the IPC defaults the tachometer to 0 rpm.

Possible Sources
- PCM
- GWM concern
- IPC

H1 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
- Using a diagnostic scan tool, perform the IPC self-test.
- Check for recorded Diagnostic Trouble Codes (DTCs) from the IPC self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes REFER to DTC Chart: Instrument Panel Cluster (IPC) .

No GO to H2

H2 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, check the GWM Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes REFER to: Communications Network

No GO to H3

H3 PERFORM THE PCM (POWERTRAIN CONTROL MODULE) KOEO (KEY ON, ENGINE OFF) SELF-TEST
- Using a diagnostic scan tool, perform the KOEO self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes REFER to the appropriate Electronic Engine Controls article.

No GO to H4

H4 PERFORM THE TACHOMETER ACTIVE COMMAND USING THE DIAGNOSTIC SCAN TOOL
- Using a diagnostic scan tool, view the IPC Parameter Identifications (PIDs).
- Select the IPC tachometer (TACH_IND) PID.
- NOTE: Make sure to set the diagnostic scan tool to 0 rpm before beginning this step.
  
  Command the tachometer on and off while monitoring the tachometer.
Does the tachometer begin at 0 rpm and increase to approximately 800 rpm and return to 0 rpm?

Yes Refer to PCM Guided Routine .

No INSTALL a new IPC. Refer to Instrument Panel Cluster (IPC) .