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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the power steering motor/module assembly.
  2. Test for less than 1 ohm between the ground circuit terminal A and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Disconnect the X3 harness connector at the power steering motor/module assembly.
  4. Connect the EL-47564  Power Steering Control Module (PSCM) Test Harness.
  5. Test for less than 1 ohm between the low reference circuit terminal and ground at the test harness connector.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the power steering motor/module assembly.
  6. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal and ground at the test harness connector.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the power steering motor/module assembly.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the power steering motor/module assembly.
  7. Verify the scan tool torque sensor signal 1 parameter is greater than 4.75 volts.
    • If less than the specified range, replace the power steering motor/module assembly.
  8. Install a 3A fused jumper wire between the torque sensor signal 1 circuit terminal and the low reference circuit terminal at the test harness connector. Verify the scan tool steering position sensor signal 1 parameter is less than 0.25 volt.
    • If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the power steering motor/module assembly.
  9. Verify the scan tool torque sensor signal 2 parameter is greater than 4.75 volts.
    • If less than the specified range, replace the power steering motor/module assembly.
  10. Install a 3A fused jumper wire between the torque sensor signal 2 circuit terminal and the low reference circuit terminal at the test harness connector. Verify the scan tool steering position sensor signal 2 parameter is less than 0.25 volt.
    • If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the power steering motor/module assembly.
  11. If all circuits test normal, replace the torque/position sensor.
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