Pinpoint Test Ah: The Water In Fuel Indicator Is Never Or Always On

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

If the water in fuel message is missing for less than 5 seconds, the IPC defaults the water in fuel indicator to its last indication state (on or off) based on the last known message received.

If the water in fuel message is missing for 5 seconds or longer, the IPC defaults the water in fuel indicator off.

Possible Sources
- Communication concern
- GWM concern
- PCM concern
- IPC

AH1 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) INDICATOR LAMP CONTROL ACTIVE COMMAND USING A DIAGNOSTIC SCAN TOOL
- Using a diagnostic scan tool, view the IPC Parameter Identifications (PIDs).
- Select the IPC all warning PID (ALL_LAMP).
- Command all the warning lamps on then off while observing the water in fuel indicator.
Does the water in fuel indicator turn on when commanded on and turn off when commanded off?

Yes GO to AH2

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

AH2 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
- Using a diagnostic scan tool, perform the IPC self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes REFER to DTC Chart: IPC .

No GO to AH3

AH3 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 DIAGNOSE all PCM Diagnostic Trouble Codes (DTCs). REFER to: appropriate Electronic Engine Controls article .