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

Instrumentation and Warning Chimes

Pinpoint Test L: 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 or invalid 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 (Instrument Cluster) sets DTC U0100 in continuous memory and defaults the charging system warning indicator on. If the charging data received is deemed invalid by the IC (Instrument Cluster) for 5 seconds or longer, the IC (Instrument Cluster) defaults the charging system warning indicator on.

NOTE: If DTC U0100 is set in the IC (Instrument Cluster), 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 (Instrument Cluster)

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

L1 CARRY OUT THE IC (Instrument Cluster) INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: IC (Instrument Cluster) DataLogger.

- Select the IC (Instrument Cluster) 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 L2.

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

L2 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO (Key ON Engine OFF) 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 L3.

L3 CHECK THE CHARGING SYSTEM OPERATION

- Check the charging system operation.

Does the charging system operate correctly?

Yes
GO to L4.

No
REFER to Charging System.

L4 RETRIEVE THE RECORDED DTCs FROM THE IC (Instrument Cluster) SELF-TEST

- Check for recorded IC (Instrument Cluster) DTCs from the self-test.

Are any DTCs recorded?

Yes
For DTC U0100, GO to Pinpoint Test AJ. Pinpoint Test AJ: DTC U0100

For all other DTCs, REFER to DTC Charts. Instrument Panel, Gauges and Warning Indicators

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