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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Pontiac Torrent and 2008 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector of the ECM. Verify that there is less than 1.0 ohm between the ground circuits and the negative battery terminal.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  2. Ignition ON, test for 11-14 volts between the battery positive voltage and the ground circuits of the ECM.
    • If not within the specified range, test the battery positive voltage circuits for a short to ground or an open/high resistance.
  3. If all circuits test normal, test or replace the ECM.
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