Pinpoint Tests AG: The Wait To Start Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AG: The Wait To Start Indicator Is Never/Always On

Normal Operation

The wait to start data is transmitted to the Instrument Panel Cluster (IPC) over the High Speed Controller Area Network (HS-CAN) communication bus from the PCM. The wait to start indicator illuminates when the key is in the ON position with the engine off (KOEO) indicating that the combustion chamber is preheating.

If the wait to start data is missing for less than 5 seconds, the wait to start indicator remains in the last indication state (on or off) based upon the last known good message received. If the wait to start data is missing for more than 5 seconds, the IPC sets DTC U0100:00 in continuous memory and defaults the wait to start indicator off.

NOTE: If DTC U0100:00 sets in the IPC, other observable symptoms may be an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

- PCM
- IPC

PINPOINT TEST AG: THE WAIT TO START INDICATOR IS NEVER/ALWAYS ON

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AG1 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded IPC DTCs from the self-test.
- Are any DTCs recorded?

Yes
For DTC P0381:01, INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation. For DTC U0100:00, GO to Pinpoint Test BA. For all other DTCs, REFER to DTC Charts. Pinpoint Tests BA: DTC U0100:00

No
GO to AG2.

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AG2 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST

- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.
- Are any DTCs recorded?

Yes
REFER to Computers and Control Systems. TEST the system for normal operation.

No
GO to AG3.

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AG3 CARRY OUT THE IPC WARNING LAMPS COMMAND USING THE SCAN TOOL

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Select the IPC wait to start indicator (GLOW_PLUG) active command. Command the wait to start indicator on and off. Observe the wait to start indicator.
- Does the wait to start indicator illuminate when commanded on, and turn off when commanded off?

Yes
INSTALL a new PCM. REFER to Electronic Engine Controls - Diesel Engine Service and Repair. TEST the system for normal operation.

No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.

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