Test F: The Charging System Warning Indicator Flickers or Is Intermittent
PINPOINT TEST F: THE CHARGING SYSTEM WARNING INDICATOR FLICKERS OR IS INTERMITTENTF1-F3:
F3 Continued:
Normal Operation
With the engine running, the charging system warning indicator is off. The A (battery sense) circuit SDC02 (RD) to the generator field coil measures 13-15 volts. The S (stator) circuit (internal to the generator on all 4.6L vehicles but an external circuit VDC42 [GN] on 4.0L vehicles) is used to feed back a voltage signal from the generator to the voltage regulator. This voltage feedback signal (typically half the battery voltage) is used by the regulator to provide a signal to the PCM which in turn provides a signal over the controller area network (CAN) communication link to the instrument cluster (IC) to turn off the charging system warning indicator. The I (ignition) circuit CDC09 (YE) is used to turn on the voltage regulator. This circuit measures 6-8 volts (C102a [4.0L], C1104a [4.6L] connected) with the key in the ON position and the engine not running. Once the engine is started, the I circuit measures 8-10 volts (C102a [4.0L], C1104a [4.6L] connected). The positive battery output (B+) circuit SDC02 (RD) is the generator output supplied to the battery and electrical system.
This pinpoint test is intended to diagnose the following:
- Fusible link
- Generator connections
- Generator