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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 X1 at the PSCM.
  2. Ignition OFF, test for less than 1.0 ohm of resistance between the U phase circuit terminal 2 and the V phase circuit terminal 3 of the power steering motor.
    • If greater than the specified range, test the U and V phase circuits for an open/high resistance. If circuits test normal, replace the power steering motor.
  3. Ignition OFF, test for less than 1.0 ohm of resistance between the V phase circuit terminal 3 and the W phase circuit terminal 1 of the power steering motor.
    • If greater than the specified range, test the V and W phase circuits for an open/high resistance. If circuits test normal, replace the power steering motor.
  4. Ignition OFF, test for less than 1.0 ohm of resistance between the U phase circuit terminal 2 and the W phase circuit terminal 1 of the power steering motor.
    • If greater than the specified range, test the U and W phase circuits for an open/high resistance. If circuits test normal, replace the power steering motor.
  5. Ignition OFF, test for greater than 1.0 Mega-ohm of resistance between the U phase circuit terminal 2 and ground.
    • If less than the specified range, test the U phase circuit for a short to ground. If circuits test normal, replace the power steering motor.
  6. Ignition OFF, test for greater than 1.0 Mega-ohm of resistance between the V phase circuit terminal 3 and ground.
    • If less than the specified range, test the V phase circuit for a short to ground. If circuits test normal, replace the power steering motor.
  7. Ignition OFF, test for greater than 1.0 Mega-ohm of resistance between the W phase circuit terminal 1 and ground.
    • If less than the specified range, test the W phase circuit for a short to ground. If circuits test normal, replace the power steering motor.
  8. If all circuits test normal, test or replace the PSCM.
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