Scheme 6
![Scheme 6: ON-VEHICLE INSPECTION [05/2013 - 01/2014]](https://i.diagnostdata.com/repair/5b/5b49c3cca18a7d40b6713e393f2b817ec8e09cc6e0a4deb4870ef5d71226ab5f.webp)
- CHECK STEERING EFFORT (TORQUE) NOTE: Some of these service operations may affect the SRS airbags. Read the precautionary notices concerning the SRS airbag system before servicing. Stop the vehicle on a level, paved surface and align the wheels straight ahead. Disconnect the cable from the negative (-) battery terminal. WARNING: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected. Refer to «INITIALIZATION [05/2013 - 01/2014]»(ref-615109-S22240423792014050900000) . Remove the steering pad. Refer to «REMOVAL [05/2013 - 01/2014]»(ref-615288-S24589971142014050900000) . Connect the cable to the negative (-) battery terminal. Using a torque wrench, check that the steering wheel set nut is properly tightened. Torque: 50 N*m (510 kgf*cm, 37 ft.*lbf) Start the engine so that the power steering is available. Turn the steering wheel 90 degrees to the right and check the steering effort (torque) while continuing to turn it further in the same direction. Steering effort (Reference) 6.9 N*m (70 kgf*cm, 61 in.*lbf) or less Align the front wheels facing straight ahead. Disconnect the cable from the negative (-) battery terminal. WARNING: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected. Refer to «INITIALIZATION [05/2013 - 01/2014]»(ref-615109-S22240423792014050900000) . Install the steering pad. Refer to «INSTALLATION [05/2013 - 01/2014]»(ref-615288-S12633268772014050900000) . Connect the cable to the negative (-) battery terminal. Clear the DTCs. Refer to «DTC CHECK / CLEAR [05/2013 - 01/2014]»(ref-615289-S14059869342014050900000) . Inspect the airbag warning light. Refer to «DIAGNOSIS SYSTEM [05/2013 - 01/2014]»(ref-615289-S10521550472014050900000) .
DESCRIPTION
The torque sensor converts the rotational 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 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 | Deviation between torque sensors TRQ1 and TRQ2 exceeds the specified value. | |
| C1514 | A torque sensor power source voltage error. | |
| C1517 | Temporary control due to a malfunction related to the torque sensor continues for a long time. |
Scheme 7
The torque sensor converts the rotational 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 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 | Deviation between torque sensors TRQ1 and TRQ2 exceeds the specified value. | |
| C1514 | A torque sensor power source voltage error. | |
| C1517 | Temporary control due to a malfunction related to the torque sensor continues for a long time. |
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 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. |
| 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. |
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 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. |
| 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. |
If the power steering ECU stores 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 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). |
If the power steering ECU stores 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 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). |
The power steering ECU supplies 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 motor) Power steering ECU assembly |
| C1523 | An excessively large current deviation. | |
| C1524 | A short (or open) in the motor circuit or an abnormal voltage or current in the motor circuit. | |
| C1555 | A motor relay failure. |
Scheme 8
The power steering ECU supplies 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 motor) Power steering ECU assembly |
| C1523 | An excessively large current deviation. | |
| C1524 | A short (or open) in the motor circuit or an abnormal voltage or current in the motor circuit. | |
| C1555 | A motor relay failure. |
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 Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| 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. |
| 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. |
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 Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| 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. |
| 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. |
The motor rotation angle sensor detects the motor rotation angle and sends this information to the power steering ECU.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1528 | A motor rotation angle sensor malfunction. | Steering column assembly (motor rotation angle sensor) Power steering ECU assembly |
Scheme 9
The motor rotation angle sensor detects the motor rotation angle and sends this information to the power steering ECU.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1528 | A motor rotation angle sensor malfunction. | Steering column assembly (motor rotation angle sensor) Power steering ECU assembly |
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 these signals.
If the ECU stores this DTC, it adjusts the amount of power assist to that used for a speed of 100 km/h (62 mph) and continues system control.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1541 | Vehicle speed signals received 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 assembly |
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 these signals.
If the ECU stores this DTC, it adjusts the amount of power assist to that used for a speed of 100 km/h (62 mph) and continues system control.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1541 | Vehicle speed signals received 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 assembly |
The power steering ECU determines the ignition switch to be ON or off through the IG power source circuit.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1551 | An IG power source circuit malfunction inside ECU. | ECU-IG1 No. 1 fuse IG power source circuit Power steering ECU assembly |
Scheme 10
The power steering ECU determines the ignition switch to be ON or off through the IG power source circuit.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1551 | An IG power source circuit malfunction inside ECU. | ECU-IG1 No. 1 fuse IG power source circuit Power steering ECU assembly |
When a problem occurs in the power steering system, the power source relay circuit is shut off to stop the power assist.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1552 | A PIG power source circuit malfunction inside the ECU. | EPS fuse PIG power source circuit Power steering ECU assembly |
| C1554 | A power source relay circuit malfunction. |
Scheme 11
When a problem occurs in the power steering system, the power source relay circuit is shut off to stop the power assist.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1552 | A PIG power source circuit malfunction inside the ECU. | EPS fuse PIG power source circuit Power steering ECU assembly |
| C1554 | A power source relay circuit malfunction. |
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 Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1581 | Assist map not written in the power steering ECU. | Power steering ECU assembly CAN communication system |
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 Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1581 | Assist map not written in the power steering ECU. | Power steering ECU assembly CAN communication system |
If an incorrect power steering 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 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 | An assist map mismatch. | Power steering ECU assembly CAN communication system |
If an incorrect power steering 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 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 | An assist map mismatch. | Power steering ECU assembly CAN communication system |
The power steering ECU receives signals from the ECM and brake actuator assembly (skid control ECU) via the CAN communication system.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| U0100 | Lost communication with ECM/PCM "A". | CAN communication system ECM |
| U0129 | Lost communication with the brake system control module. | CAN communication system Brake actuator assembly (skid control ECU) |
The power steering ECU receives signals from the ECM and brake actuator assembly (skid control ECU) via the CAN communication system.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| U0100 | Lost communication with ECM/PCM "A". | CAN communication system ECM |
| U0129 | Lost communication with the brake system control module. | CAN communication system Brake actuator assembly (skid control ECU) |
If the power steering ECU detects a malfunction, the power steering warning light comes on. At this time, the power steering ECU stores a DTC in its memory.
Scheme 12
Scheme 13
If the power steering ECU detects a malfunction, the power steering warning light comes on. At this time, the power steering ECU stores a DTC in its memory.