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 Cluster (IC) 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 charging system indicator remains in the last indication mode (on or off). If the charging system message is missing for more than 5 seconds, the IC sets DTC U0100 in continuous memory and defaults the charging system indicator on.

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

This pinpoint test is intended to diagnose the following:

- Charging system concern
- PCM
- IC



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

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Z1 CARRY OUT THE IC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC 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 IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

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Z2 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.

No
GO to Z3.

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Z3 CHECK THE CHARGING SYSTEM OPERATION


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

Yes
GO to Z4.

No
REFER to Charging System.

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Z4 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Check for recorded IC DTCs from the self-test.
- Is DTC U0100 recorded?

Yes
Go To Pinpoint Test BE. Pinpoint Tests BE: DTC U0100

No
INSTALL a new PCM. TEST the system for normal operation.

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