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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 X2 harness connector at the PSCM.
  2. Ignition OFF, test for 10-200 ohms of resistance between terminal 1 and terminal 3.
    • If not within the specified range, test the exciting circuit and the exciting ground circuit for an open/high resistance or a short. If the circuits test normal, replace the electric power steering (EPS) motor.
  3. Ignition OFF, test for 3K-10K ohms of resistance between terminal 6 and terminal 3.
    • If not within the specified range, test the SIN circuit and the exciting ground circuit for an open/high resistance or a short. If the circuits test normal, replace the EPS motor.
  4. Ignition OFF, test for 6K-20K ohms of resistance between terminal 5 and terminal 3.
    • If not within the specified range, test the COS circuit and the exciting ground circuit for an open/high resistance or a short. If the circuits test normal, replace the EPS motor.
  5. Ignition OFF, test for greater than 1M ohms of resistance between terminal 3 and the motor flange.
    • If less than the specified value, test the exciting ground circuit for a short to ground. If the circuit tests normal, replace the EPS motor.
  6. If all circuits test normal, test or replace the PSCM.
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