Fail-Safe Chart
When a problem occurs in the power steering system, the PS warning light on the combination meter comes on, and the ECU stops the steering power assist, maintains the amount of power assist constant, or reduces the amount of power assist to protect the system.
FREEZE FRAME DATA CHART
| DTC No. | Malfunction | Fail-safe |
|---|---|---|
| C1511/11 C1512/12 C1513/13 C1514/14 |
Torque sensor malfunction | Assist force restricted |
| C1515/15 C1516/16 |
Torque sensor calibration malfunction | Power assist stops |
| C1517/17 | Torque sensor malfunction | Power assist stops |
| C1524/24 | Motor malfunction | Power assist stops |
| C1531/31 C1532/32 |
Power steering ECU malfunction | Power assist stops |
| C1533/33 | Temperature sensor malfunction in power steering ECU | Overheat prevention control continues without using substrate temperature sensor |
| C1534/34 | EEPROM abnormal |
|
| C1535/35 | Steering wheel location data error | Power assist stops |
| C1551/51 | IG power source voltage error | Assist force restricted |
| C1552/52 | PIG power source voltage error | Assist force restricted |
| C1553/53 | Over voltage at IG and PIG terminals | Assist force restricted |
| C1554/54 | Power source relay malfunction | Power assist stops |
| C1555/55 | Motor relay malfunction | Power assist stops |
| C1581/81 | ECU malfunction (Assist map is not written) | Power assist permitted using default value |
| U0100/92 | ECM communication error | Power assist stops |
| U0129/93 | Skid control ECU communication error | Amount of power assist is locked at speed of 70 km/h (43 mph) |
| - | Extremely high temperature in ECU | Assist force restricted until normal ECU temperature recovers |
| - | Power source voltage drop | Assist force suspended until voltage recovers |
HINT:
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 idling.