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.
2008 Toyota Highlander Base, AWDFACTORY OEM SERVICE PROCEDURE
Power Steering (Except Hybrid)
- Power Steering System
- Precaution
- Parts Location
- System Diagram
- System Description
- How To Proceed With Troubleshooting
- Problem Symptoms Table
- Terminals Of Ecu
- Diagnosis System
- DTC Check/Clear
- Freeze Frame Data
- Fail-Safe
- Data List/Active Test
- Diagnostic Trouble Code Table
- On-Vehicle Inspection
- DTC C1511, C1512, C1513, C1514: Torque Sensor Circuit Malfunction; Torque Sensor Power Supply Abnormal
- DTC C1521: Motor Circuit Malfunction
- DTC C1524: Motor Circuit Malfunction
- DTC C1528: Motor Rotation Angle Sensor Malfunction
- DTC C1531, C1532, C1533, C1534: ECU Malfunction
- DTC C1551: IG Power Supply Voltage Malfunction
- DTC C1552: PIG Power Supply Voltage Malfunction
- DTC C1554, C1555: Power Supply Relay Failure; Motor Relay Welding Failure
- DTC C1581: Assist Map Number Un-Writing
- DTC U0073, U0100, U0129: Control Module Communication Bus OFF; Lost Communication with ECM/PCM "A1"; Lost Communication with Brake System Control Module
- EPS Warning Light Circuit
- Steering Gear
- Power Steering Ecu
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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