Test B: The Charging System Warning Indicator Is On And Any Charging System DTC Stored

PINPOINT TEST B: THE CHARGING SYSTEM WARNING INDICATOR IS ON AND ANY CHARGING SYSTEM DTC STORED

Normal Operation
With the engine running, the charging system warning indicator is off. The Sense A circuit 35 (OG/LB) to the generator field coil is 13-15 volts. This voltage feedback is used by the regulator to maintain the battery voltage at the desired setpoint. The S (stator) circuit (internal to the generator) is used to monitor generator operation. This circuit and other regulator internal conditions are checked by the regulator to allow the PCM to turn off the charging system warning indicator by sending a message over the controller area network (CAN) bus to the instrument cluster. The positive battery output (B+) circuit 38 (RD) is the generator output voltage supplied to the battery and electrical system.

This pinpoint test is intended to diagnose the following:
- Generator
- Instrument cluster
- PCM

B1-B4:

B4-B8:

B8-B12:

B13-B15:

B16-B19:

B19-B23:

B23-B24: