Pinpoint Test 2: The Charging System Warning Indicator Is On And Any Charging System Dtc Stored
Pinpoint Test 2: The Charging System Warning Indicator Is On And Any Charging System Dtc StoredNormal Operation
With the engine running, the charging system warning indicator is off. The A circuit (BR/R) from the battery B+ to the generator regulator 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 CAN bus to the instrument cluster. The positive battery output (B+) circuit (R) is the generator output voltage supplied to the battery and electrical system.
Possible Causes
- Generator
- Instrument cluster
- PCM
Diagnostic Procedure
CAUTION: Electronic modules are sensitive to electrostatic discharge. If exposed to these charges, damage can result.
NOTE:
- Make sure battery voltage is greater than 12.2 volts prior to carrying out this pinpoint test.
- Do not have a battery charger attached during vehicle testing.
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