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Home >> Pontiac >> 2009 >> Torrent Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC P0621 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2006 Pontiac Torrent and 2006 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. With ignition ON, and the engine OFF.
  2. Disconnect the generator harness and measure the voltage of the generator turn on signal circuit, should read near 0 volts.
    • If greater than 0 volts test the generator turn on signal circuit for a short to voltage, or replace the PCM.
  3. With ignition ON, and the engine running, the voltage of the generator turn on signal circuit, should read near 5 volts.
    • If no voltage is measured, test the generator turn on signal circuit for a short to ground, an open or a high resistance or replace the PCM.
  4. Go to Charging System Test .
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