DESCRIPTION
The torque sensor converts the rotation torque input to the steering wheel into an electrical signal and sends it to the power steering ECU assembly. Based on this signal, the ECU detects steering effort.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1511 | A torque sensor (TRQ1) signal error or stop | Steering column assembly (torque sensor) Power steering ECU assembly |
| C1512 | A torque sensor (TRQ2) signal error or stop | |
| C1513 | The deviation between torque sensor TRQ1 and TRQ2 exceeds a specified value. | |
| C1514 | A torque sensor power supply voltage error | |
| C1517 | Temporary control due to a malfunction related to the torque sensor continues for long time. |
Scheme 5
These DTCs do not indicate a malfunction. The power steering ECU assembly stores these DTCs when it determines that the rotation angle sensor value initialization and torque sensor zero point calibration have not been performed.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1515 | Torque sensor zero point calibration has not been performed. | There is no malfunction if this DTC is not output again after performing torque sensor zero point calibration. |
| C1525 | Rotation angle sensor value initialization has not been performed. | There is no malfunction if this DTC is not output again after performing rotation angle sensor value initialization. |
These DTCs do not indicate a malfunction. The power steering ECU assembly stores these DTCs when it determines that the rotation angle sensor value initialization and torque sensor zero point calibration are incomplete.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1516 | Torque sensor zero point calibration is incomplete due to the steering wheel being touched during calibration. | There is no malfunction if this DTC is not output again after clearing the DTC and torque sensor calibration value, and performing zero point calibration. |
| C1526 | Rotation angle sensor value initialization is incomplete due to the steering wheel being touched during calibration. | There is no malfunction if this DTC is not output again after clearing the DTC and torque sensor calibration value, and performing rotation angle sensor value initialization. |
If the power steering ECU assembly stores these DTCs, it will shut off the power supply relay circuit (built into the power steering ECU assembly) and stop power assist. However, power assist continues if DTC C1533 or C1534 is stored.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1521 | Motor overcurrent | Power steering ECU assembly |
| C1531 | An ECU internal malfunction (CPU malfunction) | |
| C1532 | An ECU internal malfunction (peripheral circuit malfunction) | |
| C1533 | An ECU internal malfunction (substrate temperature sensor malfunction) | |
| C1534 | An ECU internal malfunction (EEPROM error) | |
| C1554 | A power supply relay circuit malfunction |
The power steering ECU assembly supplies the current to the power steering motor through the motor circuit.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1522 | A motor current sensor malfunction | Steering column assembly Power steering ECU assembly |
| C1523 | An excessively large current deviation | |
| C1524 | A short or open in the motor circuit or abnormal voltage or current in the motor circuit | |
| C1555 | A motor relay malfunction |
Scheme 6
The rotation angle sensor detects the motor rotation angle and sends this information to the power steering ECU assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1528 | A rotation angle sensor malfunction | Rotation angle sensor (built into steering column assembly) Power steering ECU assembly |
Scheme 7
The power steering ECU assembly receives vehicle speed signals from the skid control ECU via CAN communication. The power steering ECU assembly provides appropriate assisting force in accordance with the vehicle speed, based on the signals.
If the power steering ECU assembly stores this DTC, it adjusts the amount of power assist to the amount provided for a speed of 100 km/h (62 mph) and continues the system control.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1541 | The vehicle speed signals malfunction | Speed sensor circuit Skid control ECU CAN communication system Power steering ECU assembly |
The power steering ECU assembly determines whether the ignition switch status is ON or off through the IG power supply circuit.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1551 | An IG power supply circuit malfunction inside the ECU | ECU IG1 fuse IG power supply circuit Power steering ECU assembly |
Scheme 8
When a problem occurs in the power steering system, the power supply relay circuit is shut off to stop the power assist.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1552 | A PIG power supply circuit malfunction inside the ECU | EPS fuse PIG power supply circuit Power steering ECU assembly |
Scheme 9
The power steering ECU assembly stores this DTC when it determines that the assist map is not written in the ECU.
HINT
The assist map is data written in the power steering ECU assembly to control the degree of power assist. The assist map is selected based on the vehicle's specified communication data.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1581 | The assist map is not written in the power steering ECU assembly. | Assist map not written CAN communication system ECM Power steering ECU assembly |
If an incorrect power steering ECU assembly or ECM or skid control ECU is installed, DTC C1582 is stored as the vehicle specification and data do not match.
HINT
The assist map is data written in the power steering ECU assembly to control the degree of assistance. The assist map is selected based on the vehicle's specified communication data.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1582 | Data that does not match the vehicle specification is received through CAN communication. | CAN communication system ECM (wrong assembly) Skid control ECU (wrong assembly) Power steering ECU assembly (wrong assembly) |
The power steering ECU assembly receives signals from the ECM and skid control ECU (brake actuator assembly) via the CAN communication system.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| U0100 | Lost communication with the ECM/PCM "A" | CAN communication system ECM |
| U0122 | Lost communication with the brake system control module | CAN communication system Skid control ECU (Brake actuator assembly) |
| U0416 | The brake system control module signal malfunction |
If the power steering ECU assembly detects a malfunction, the EPS warning light comes on. At this time, the power steering ECU assembly stores a DTC in its memory.
Scheme 10
See also:
• REMOVAL [07/2013 - ]