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

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

M1 CHECK THE CHARGING SYSTEM
- Check the charging system. Refer to CHARGING SYSTEM - GENERAL INFORMATION article.
- Is the charging system operating correctly?
1. YES : Go to M2.
2. NO : REFER to CHARGING SYSTEM - GENERAL INFORMATION article.
M2 CARRY OUT THE INSTRUMENT CLUSTER OUTPUT STATE CONTROL USING THE SCAN TOOL
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Output State Control
- Enter the instrument cluster output state control and select CHARGE_LMP. Command the charging system warning indicator on and off and observe the charging system warning indicator.
- Does the charging system warning indicator illuminate when commanded on and turn off when commanded off?
1. YES : Go to M3.
2. NO : Go to M4.
M3 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
1. YES : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS article. TEST the system for normal operation.
2. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
M4 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all the instrument cluster connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the instrument cluster connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
1. YES : INSTALL a new instrument cluster. REFER to Instrument Cluster (IC) in this article. TEST the system for normal operation.
2. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.