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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2311 (POWER STEERING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0475CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Circuit/System Testing

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

DTC C0475 00

  1. Ignition OFF, disconnect the X2 harness connector at the PSCM.
  2. Test for less than 5 ohms between the ground circuit terminal 1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify a test lamp illuminates between the B+ terminal 2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, connect the X2 harness connector at the PSCM. Disconnect the X3 harness connector at the PSCM.
  5. Test for less than 5 ohms between the ground circuit terminal 3 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  6. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  7. With a scan tool, clear the DTC.
  8. Drive the vehicle under normal driving conditions. Verify DTC C0475 00 does not set.
    • If the DTC sets, replace the PSCM.

DTC C0475 08

  1. Ignition OFF, disconnect the X2 harness connector at the PSCM.
  2. Test for less than 5 ohms between the ground circuit terminal 1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify a test lamp illuminates between the B+ terminal 2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, connect the X2 harness connector at the PSCM. Disconnect the X3 harness connector at the PSCM.
  5. Test for less than 5 ohms between the ground circuit terminal 3 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  6. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  7. Ignition OFF, connect the X3 harness connector at the PSCM. Disconnect the X1 harness connector at the PSCM.
  8. Test for less than 5 ohms between the signal circuit terminal 7 and the signal circuit terminal 8.
    • If greater than the specified range, test both signal circuits for an open/high resistance. If the circuits test normal, replace the steering actuator.
  9. Test for less than 5 ohms between the signal circuit terminal 7 and the signal circuit terminal 14.
    • If greater than the specified range, test both signal circuits for an open/high resistance. If the circuits test normal, replace the steering actuator.
  10. Test for less than 5 ohms between the signal circuit terminal 8 and the signal circuit terminal 14.
    • If greater than the specified range, test both signal circuits for an open/high resistance. If the circuits test normal, replace the steering actuator.
  11. If all circuits test normal, replace the PSCM. Operate the vehicle within the Condition for Setting the DTC. Verify the DTC does not reset.
    • If the DTC resets, replace the steering actuator.
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