Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1873 (POWER STEERING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0475 (WITHOUT HP5)CIRCUIT/SYSTEM TESTING (WITHOUT HP5)
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Circuit/System Testing (without HP5)
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Circuit/System Testing (without HP5)
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector X5 at the PSCM.
- Ignition OFF, test for less than 1.0 Ξ© of resistance between the control circuit terminal 2 and the control circuit terminal 3.
- If greater than the specified range, test the control circuits for an open/high resistance. If circuits test normal, replace the power steering motor.
- Ignition OFF, test for less than 1.0 Ξ© of resistance between the control circuit terminal 3 and the control circuit terminal 1.
- If greater than the specified range, test the control circuits for an open/high resistance. If circuits test normal, replace the power steering motor.
- Ignition OFF, test for less than 1.0 Ξ© of resistance between the control circuit terminal 2 and the control circuit terminal 1.
- If greater than the specified range, test the control circuits for an open/high resistance. If circuits test normal, replace the power steering motor.
- Ignition OFF, test for greater than 1.0 MΞ© of resistance between the control circuit terminal 2 and ground.
- If less than the specified range, test the control circuit for a short to ground. If circuits test normal, replace the power steering motor.
- Ignition OFF, test for greater than 1.0 MΞ© of resistance between the control circuit terminal 3 and ground.
- If less than the specified range, test the control circuit for a short to ground. If circuits test normal, replace the power steering motor.
- Ignition OFF, test for greater than 1.0 MΞ© of resistance between the control circuit terminal 1 and ground.
- If less than the specified range, test the control circuit for a short to ground. If circuits test normal, replace the power steering motor.
- If all circuits test normal, test or replace the PSCM.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.