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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify DTCs P0A38 or P0A39 are not set.
    • If P0A38 or P0A39 are set diagnose those first.
  2. Ignition OFF, disconnect harness connectors from the SGCM. Refer to Generator Control Module Replacement 
  3. Test for 120 - 125 kohms between the signal circuit SGCM X2 terminal 2 and the low reference circuit terminal 14.
    • If within the specified range, replace the SGCM.
  4. Disconnect the 7 pin X1 connector at the MGU. Refer to Generator with Starter Replacement 
  5. Test for infinite resistance between the SGCM X2 connector terminal 2 and ground.
    • If less than the specified value, test the circuit for short to ground.
  6. Test for less than 1 ohm between the SGCM X2 connector terminal 2 and the MGU X1 connector terminal G.
    • If greater than the specified value, test the circuit for an open/high resistance.
  7. Test for less than 1 ohm between SGCM X2 connector terminal 14 and the MGU X1 connector terminal F.
    • If greater than the specified value, test the circuit for an open/high resistance.
  8. If circuits test normal, replace the MGU.
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