LEMON Manuals: Even more car manuals for everyone
Home >> Saturn >> 2007 >> Ion Red Line >> Repair and Diagnosis >> External Pages >> Different car >> Section 194 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC P0621 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the generator.
  2. Ignition ON, test for less than 1 volt between the generator turn ON signal and ground.
    • If greater than the specified range, test the generator turn ON signal circuit for a short to voltage. If the circuit tests normal, replace the ECM/PCM.
  3. Engine running, test for greater than 3.5 volts between the generator turn ON signal and ground.
    • If less than the specified range, test the generator turn ON signal circuit for a short to ground, an open, or a high resistance. If the circuit tests normal, replace the ECM/PCM.
  4. If all circuits test normal, replace the generator.
scientia non olet · About LEMON Manuals