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

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test Z: 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 Body Control Module (BCM) over the High Speed Controller Area Network (HS-CAN) communication bus. The BCM receives the charging system status from the PCM over the HS-CAN communication bus. When a fault is detected in the charging system, the BCM sends the IPC a request to turn the charging system warning indicator on.

If the charging system warning indicator request message is missing for less than 5 seconds, the charging system indicator remains in the last indication state (on or off). If the charging system message is missing for more than 5 seconds, the IPC sets DTC U0140:00 in continuous memory and defaults the charging system indicator on.

NOTE: If DTC U0140:00 sets in the IPC, other observable symptoms may be an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

- Charging system concern
- PCM
- IPC

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

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Z1 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. Observe the charging system warning indicator.
- Does the charging system warning indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to Z2.

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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Z2 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST

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

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

No
GO to Z3.

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Z3 CHECK THE CHARGING SYSTEM OPERATION

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

Yes
GO to Z4.

No
REFER to Charging System Testing and Inspection.

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Z4 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded IPC DTCs from the self-test.
- Is DTC U0140:00 recorded?

Yes
GO to Pinpoint Test BF. Pinpoint Tests BF: DTC U0140:00

No
If the charging system warning indicator is never on, the system is operating correctly at this time. If the charging system warning indicator is always on, INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair. TEST the system for normal operation.

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