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Home >> Chevrolet >> 2010 >> Cobalt SS >> Repair and Diagnosis >> External Pages >> Different car >> Section 109 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC P2500 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Saturn Sky and 2010 Pontiac Solstice. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector X1 at the generator.
  2. Engine running, test for greater than 3.5 volts between the generator turn on signal circuit terminal B X1 and ground.
    • If less than the specified range, test the generator turn on signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  3. If the circuit tests normal, test or replace the generator.
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