Pinpoint Test W: The Charging System Warning Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test W: The Charging System Warning Indicator Is Never/Always On

Normal Operation

The charging system indicator is controlled by the Instrument Panel Cluster (IPC) based upon data received from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus.

If the charging system message is missing for less than 5 seconds, the IPC defaults the charging system warning indicator to the last on/off state, based upon the last known good charging system status message received.

If the charging system message is missing for more than 5 seconds, the IPC sets DTC U0100:00 in continuous memory and defaults the charging system warning indicator on.

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

This pinpoint test is intended to diagnose the following:

- Charging system concern
- PCM
- IPC


PINPOINT TEST W: THE CHARGING SYSTEM WARNING INDICATOR IS NEVER/ALWAYS ON

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W1 CARRY OUT THE IPC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger .
- Select the IPC charging system warning indicator (CHARGE_LMP) active command. Command the charging system warning indicator on and off while observing the charging system warning indicator.
- Does the charging system warning indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to W2.

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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W2 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST


- Check for recorded DTCs from the IPC self-test.
- Is DTC U0100:00 recorded?

Yes
GO to Pinpoint Test AU. Pinpoint Tests AU: DTC U0100:00

No
GO to W3.

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W3 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 charging system DTCs recorded?

Yes
REFER to Charging System Testing and Inspection.

No
GO to W4.

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W4 CHECK THE CHARGING SYSTEM OPERATION


- Check the charging system operation. Refer to Charging System Testing and Inspection.
- Does the charging system operate correctly?

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

No
REFER to Charging System Testing and Inspection.

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