DESCRIPTION
The torque sensor converts the rotation torque input from the steering wheel into electric signals and sends them to the power steering ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1511 | Torque sensor malfunction | Steering column assembly (Torque sensor) Power steering ECU |
| C1512 | ||
| C1513 | ||
| C1514 | ||
| C1517 |
Scheme 45
These DTCs do not indicate a malfunction. The power steering ECU outputs 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 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 outputs 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 output.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1521 | Motor overcurrent | Power steering ECU |
| C1531 | ECU internal malfunction (CPU malfunction) | |
| C1532 | ECU internal malfunction (Peripheral circuit malfunction) | |
| C1533 | ECU internal malfunction (Substrate temperature sensor malfunction) | |
| C1534 | ECU internal malfunction (EEPROM error) |
The power steering ECU supplies 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 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 46
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 | Steering column assembly (Motor rotation angle sensor) Power steering ECU |
Scheme 47
The power steering ECU receives vehicle speed signals from the 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 Skid control ECU CAN communication system Power steering ECU |
The power steering ECU distinguishes the power 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 | ECU-IG No. 1 fuse IG power source circuit Power steering ECU |
Scheme 48
When 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 |
| C1554 | Power source relay circuit malfunction | EPS fuse PIG power source circuit Power steering ECU |
Scheme 49
The power steering ECU outputs this DTC when it determines that the assist map is not written in the ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1581 | Assist map not written in power steering ECU | Power steering ECU Hybrid control system CAN communication system |
When an incorrect hybrid vehicle control ECU 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 Hybrid vehicle control ECU |
The power steering ECU receives signals from the skid control ECU, hybrid vehicle control ECU and driving support ECU via the CAN communication system.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| U0129 | Lost communication with brake system control module | CAN communication system Skid control ECU |
| U0293 | Lost communication with hybrid vehicle control ECU | CAN communication system Hybrid vehicle 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 50
See also:
• REMOVAL