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. Based on this signal, the ECU detects steering effort.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1511 | Torque sensor (TRQ1) signal error or stop | Steering column assembly (torque sensor) Power steering ECU |
| C1512 | Torque sensor (TRQ2) signal error or stop | |
| C1513 | Deviation between torque sensors TRQ1 and TRQ2 exceeds specified value | |
| C1514 | Torque sensor power source voltage error | |
| C1517 | Temporary control due to malfunction related to torque sensor continues for long time |
Scheme 44
These DTCs do not indicate a malfunction. The power steering ECU stores these DTCs when it determines that the rotation angle sensor value initialization and torque sensor zero point calibration have not been performed.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1515 | This DTC is detected when 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 | This DTC is detected when 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 stores these DTCs when it determines that the rotation angle sensor value initialization and torque sensor zero point calibration are incomplete.
| DTC No. | 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 DTCs 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 DTCs and torque sensor calibration value, and performing rotation angle sensor value initialization. |
If the power steering ECU detects these DTCs, it will shut off the motor relay circuit (built into the power steering ECU) and stop power assist. However, power assist continues if DTC C1533 or C1534 is stored.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1521 | Motor overcurrent | Power steering ECU |
| C1531 | ECU internal malfunction (CPU malfunction) | Power steering ECU |
| C1532 | ECU internal malfunction (Peripheral circuit malfunction) | Power steering ECU |
| C1533 | ECU internal malfunction (Substrate temperature sensor malfunction) | Power steering ECU |
| C1534 | ECU internal malfunction (EEPROM error) | Power steering ECU |
| C1554 | Power source relay circuit malfunction | Power steering ECU |
If the power steering ECU detects these DTCs, it will shut off the motor relay circuit (built into the power steering ECU) and stop power assist. However, power assist continues if DTC C1533 or C1534 is stored.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1521 | Motor overcurrent | Power steering ECU |
| C1531 | ECU internal malfunction (CPU malfunction) | Power steering ECU |
| C1532 | ECU internal malfunction (Peripheral circuit malfunction) | Power steering ECU |
| C1533 | ECU internal malfunction (Substrate temperature sensor malfunction) | Power steering ECU |
| C1534 | ECU internal malfunction (EEPROM error) | Power steering ECU |
| C1554 | Power source relay circuit malfunction | Power steering ECU |
The power steering ECU supplies the current to the power steering motor through the motor circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1522 | Motor current sensor malfunction | Steering column assembly (Power steering motor) Power steering ECU |
| C1523 | Excessively large current deviation | |
| C1524 | Short (or open) in motor circuit or abnormal voltage or current in motor circuit | |
| C1555 | Motor relay circuit malfunction |
Scheme 45
The motor rotation angle sensor detects the motor rotation angle and sends this information to the power steering ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1528 | Motor rotation angle sensor malfunction | Motor rotation angle sensor (built into steering column assembly) Power steering ECU |
Scheme 46
The power steering ECU receives vehicle speed signals from the brake actuator assembly (skid control ECU) via CAN communication. The ECU provides appropriate assisting force in accordance with the vehicle speed, based on the signals.
If the ECU detects this DTC, it adjusts the amount of power assistance for a speed of 100 km/h (62 mph) and continues the system control.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1541 | This DTC is detected when vehicle speed signals via CAN communication are cut off for 3 seconds or more. | Speed sensor circuit Brake actuator assembly (Skid control ECU) CAN communication system Power steering ECU |
The power steering ECU receives vehicle speed signals from the brake actuator assembly (skid control ECU) via CAN communication. The ECU provides appropriate assisting force in accordance with the vehicle speed, based on the signals.
If the ECU detects this DTC, it adjusts the amount of power assistance for a speed of 100 km/h (62 mph) and continues the system control.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1541 | This DTC is detected when vehicle speed signals via CAN communication are cut off for 3 seconds or more. | Speed sensor circuit Brake actuator assembly (Skid control ECU) CAN communication system Power steering ECU |
The power steering ECU distinguishes the engine switch status as on (IG) or off through the IG power source circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1551 | IG power source circuit malfunction inside ECU | EPS fuse IG power source circuit Power steering ECU |
Scheme 47
If a problem occurs in the power steering system, the power source relay circuit is shut off to stop the power assist.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1552 | PIG power source circuit malfunction inside ECU | EPS fuse PIG power source circuit Power steering ECU |
Scheme 48
The power steering ECU 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 to control the degree of assistance. The assist map is selected based on the vehicle's specified communication data.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1581 | Assist map not written in power steering ECU | Power steering ECU CAN communication system ECM |
The power steering ECU 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 to control the degree of assistance. The assist map is selected based on the vehicle's specified communication data.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1581 | Assist map not written in power steering ECU | Power steering ECU CAN communication system ECM |
When an incorrect ECM is installed after the assist map has been recorded in the power steering ECU, then DTC C1582 is stored because the data does not match the vehicle specifications.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1582 | Assist map number mismatch | Power steering ECU CAN communication system ECM |
When an incorrect ECM is installed after the assist map has been recorded in the power steering ECU, then DTC C1582 is stored because the data does not match the vehicle specifications.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1582 | Assist map number mismatch | Power steering ECU CAN communication system ECM |
The power steering ECU receives signals from the ECM and the brake actuator assembly (skid control ECU) via the CAN communication system.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| U0100 | Lost communication with ECM/PCM "A" | CAN communication system ECM |
| U0129 | Lost communication with brake system control module | CAN communication system Brake actuator assembly (Skid control ECU) |
| U1104 | Lost communication with driving support ECU | CAN communication system Driving support ECU |
The power steering ECU receives signals from the ECM and the brake actuator assembly (skid control ECU) via the CAN communication system.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| U0100 | Lost communication with ECM/PCM "A" | CAN communication system ECM |
| U0129 | Lost communication with brake system control module | CAN communication system Brake actuator assembly (Skid control ECU) |
| U1104 | Lost communication with driving support ECU | CAN communication system Driving support ECU |
If the power steering ECU detects a malfunction, the P/S warning light comes on. At this time, the power steering ECU stores a DTC in its memory.
Scheme 49
If the power steering ECU detects a malfunction, the P/S warning light comes on. At this time, the power steering ECU stores a DTC in its memory.