POWER STEERING SYSTEM > FAIL-SAFE CHART

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If a problem occurs in the power steering system, the P/S warning light will come on in the combination meter assembly and the power steering assist will be stopped, locked at a particular point, or decreased simultaneously to protect the system.

Power Steering System 
DTC No.
Detection Condition
Fail-safe
C1511
Torque sensor malfunction
Power assist stopped
C1512
C1513
C1514
C1515
C1516
C1517
C1521
Motor circuit malfunction
C1522
C1523
C1524
C1525
Motor rotation angle sensor malfunction
C1526
C1528
C1531
ECU malfunction
C1532
C1533
Assist force restricted
C1534
C1541
Vehicle speed signal malfunction
Amount of power assist is locked at 100 km/h (62 mph) level of power assist
C1551
IG power source voltage error
Power assist stopped
C1552
PIG power source voltage error
C1554
Power source relay malfunction
C1555
Motor relay malfunction
C1581
Assist map not written in power steering ECU assembly
Controlled using default map
C1582
Assist map mismatch written in power steering ECU assembly
Controlled using current default map
U0129
Skid control ECU communication error
Amount of power assist is locked at 100 km/h (62 mph) level of power assist
U0293
HV ECU communication error
Power assist stopped

HINT:
  1. The amount of power assist may be decreased to prevent the motor and ECUs from overheating if the steering wheel is continuously turned when the vehicle is either stopped or driven at a low speed, or if the steering wheel is kept at either full lock position for a long time. In such cases, the amount of power assist returns to normal if the steering wheel is not turned for approximately 10 minutes with the power switch on (READY).
  2. If the auxiliary battery is not sufficiently charged or the voltage decreases temporarily, the amount of power assist will be reduced and the P/S warning light will come on. In such cases, the amount of power assist returns to normal when the auxiliary battery voltage recovers.