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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 X3 at the PSCM.
  2. Ignition OFF, test for 2 - 20 ohms between the exciting circuit terminal 4 and the exciting ground circuit terminal 2 of the torque sensor.
    • If not within the specified range, test the exciting and exciting ground circuits for a short or an open/high resistance. If circuits test normal, replace the steering column.
  3. Ignition OFF, test for 100 - 500 ohms between the input SIN circuit terminal 8 and the torque sensor ground circuit terminal 1 of the torque sensor.
    • If not within the specified range, test the input SIN and the torque sensor ground circuits for a short or an open/high resistance. If circuits test normal, replace the steering column.
  4. Ignition OFF, test for 300 - 1000 ohms between the input COS circuit terminal 7 and the torque sensor ground circuit terminal 1 of the torque sensor.
    • If not within the specified range, test the input COS and the torque sensor ground circuits for a short or an open/high resistance. If circuits test normal, replace the steering column.
  5. Ignition OFF, test for 50 - 200 ohms between the output SIN circuit terminal 6 and the torque sensor ground circuit terminal 1 of the torque sensor.
    • If not within the specified range, test the output SIN and the torque sensor ground circuits for a short or an open/high resistance. If circuits test normal, replace the steering column.
  6. Ignition OFF, test for 200 - 800 ohms between the output COS circuit terminal 5 and the torque sensor ground circuit terminal 1 of the torque sensor.
    • If not within the specified range, test the output COS and the torque sensor ground circuits for a short or an open/high resistance. If circuits test normal, replace the steering column.
  7. Ignition OFF, test for greater than 1.0 Mega-ohms between the exciting ground circuit terminal 2 and the torque sensor ground terminal 1.
    • If less than the specified range, test the exciting ground circuit for a short to the torque sensor ground circuit. If circuits test normal, replace the steering column.
  8. Ignition OFF, test for greater than 1.0 Mega-ohm of resistance between the torque sensor ground circuit terminal 1 and ground.
    • If less than the specified range, test the torque sensor ground circuit for a short to ground. If circuits test normal, replace the steering column.
  9. Ignition OFF, test for greater than 1.0 Mega-ohms between the exciting ground circuit terminal 2 and ground.
    • If less than the specified range, test the exciting ground circuit for a short to ground. If circuits test normal, replace the steering column.
  10. If all circuits test normal, test or replace the PSCM.
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