POWER STEERING SYSTEM FAIL-SAFE CHART

If a problem occurs in the power steering system, the power steering assist will be stopped, locked at a particular point, or decreased simultaneously to protect the system.

Table 1. Power Steering System

DTC No.

Detection Condition

Fail-safe

C1511/11

Torque sensor malfunction

Assist force restricted or power assist stopped

C1512/11

C1513/11

C1514/11

C1521/25

Motor circuit malfunction

C1524/24

C1528/12

Motor rotation angle sensor malfunction

C1531/25

ECU malfunction

C1532/25

C1533/25

C1534/25

C1541/13

Vehicle speed signal malfunction

Assist force restricted

C1551/25

IG power source voltage error

Power assist stopped

C1552/22

PIG power source voltage error

C1554/23

Power source relay malfunction

C1555/25

Motor relay malfunction

Assist force restricted or power assist stopped

C1581/26

Assist map not written in power steering ECU assembly

Controlled using default map

C1582/26

Assist map mismatch written in power steering ECU assembly

Controlled using current default map

U0100/41

Lost communication with ECM

Power assist stopped

U0129/42

Lost communication with brake actuator assembly

Assist force restricted
Tip:

  • 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 engine running.

  • If the battery is not sufficiently charged or the voltage decreases temporarily, the amount of power assist will be reduced and the power steering warning light will come on. In such cases, the amount of power assist returns to normal when the battery voltage recovers.