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Circuit/System Testing

WARNING: This page is about a different car, the 2011 Chevrolet Volt. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: The Volt Battery Pack will utilize an exchange program. Please consult the most recent revision of bulletin/PI #PIP4841, available in Service Information (SI), for a list of approved Volt Battery Pack service procedures. Components that may be removed and serviced without exchanging the complete battery pack are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disconnect the X2 harness connector at the K114B HPCM 2.
    2. NOTE: The cooling fan output circuit is pulled-up to a voltage within the ECM. 3-4 V measured on this circuit with the HPCM 2 harness connector disconnected is normal.
  2. Service Mode active, test for 3-4 V between the ECM cooling fan output circuit terminal X2-9 and ground.
    • If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
    • If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  3. If all circuits test normal, replace the K114B HPCM 2.
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