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.
2015 Scion iQFACTORY OEM SERVICE PROCEDURE
Power Steering System
POWER STEERING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| C1511/11 | Torque Sensor 1 Malfunction |
| C1512/11 | Torque Sensor 2 Malfunction |
| C1513/11 | Torque Sensor Deviation Excessive |
| C1514/11 | Torque Sensor Power Supply Voltage Malfunction |
| C1521/25 | Short in Motor Circuit |
| C1524/24 | Motor Terminal Voltage Malfunction |
| C1531/25 | ECU Malfunction |
| C1532/25 | ECU Malfunction |
| C1533/25 | Temperature Sensor Circuit is Low or High |
| C1534/25 | EEPROM Malfunction |
| C1541/13 | Vehicle Speed Signal |
| C1551/25 | IG Power Supply Voltage Malfunction |
| C1552/22 | PIG Power Supply Voltage Malfunction |
| C1554/23 | Power Supply Relay Failure |
| C1555/25 | Motor Relay Welding Failure |
| C1581/26 | Assist Map Number Un-Writing |
| C1582/26 | Assist Map Number Mismatch |
| U0100/41 | Lost Communication with ECM/PCM "A" |
| U0129/42 | Lost Communication with Brake System Control Module |
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.