Lexus ES: Torque Sensor1 (C1511-C1514,C1521-C1523,C1528,C1531-C1555)
DESCRIPTION
While torque sensor system, motor system or ECU system malfunctions are detected, the fail-safe function suspends power assist. However, power assist continues with limited assistance amount if only C1533 or C1534 is output.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Return-to-normal Condition | Note |
|---|---|---|---|---|---|---|
| C1511 | Torque Sensor1 | Torque sensor malfunction | Rack and pinion power steering gear assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1512 | Torque Sensor2 | Torque sensor malfunction | Rack and pinion power steering gear assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1513 | Torque Sensor Deviation Excessive | Torque sensor malfunction | Rack and pinion power steering gear assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1514 | Torque Sensor Power Supply Voltage | Torque sensor malfunction | Rack and pinion power steering gear assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1521 | Short in Motor Circuit | Motor overcurrent | Rack and pinion power steering gear assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1522 | Power Supply Sensor | Motor current sensor malfunction | Rack and pinion power steering gear assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1523 | Current Deviation Excessive | Excessively large current deviation | Rack and pinion power steering gear assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1528 | Motor Rotation Angle Sensor | Motor rotation angle sensor malfunction | Rack and pinion power steering gear assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1531 | ECU Malfunction | ECU internal malfunction (CPU malfunction) | Rack and pinion power steering gear assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1532 | ECU Malfunction | ECU internal malfunction (Peripheral circuit malfunction) | Rack and pinion power steering gear assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1533 | Temperature Sensor Circuit is Low or High | ECU internal malfunction (Substrate temperature sensor malfunction) | Rack and pinion power steering gear assembly | EPS warning light: Comes on | The ECU judges the system has returned to normal | - |
| C1534 | EEPROM | ECU internal malfunction (EEPROM error) | Rack and pinion power steering gear assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1555 | Motor Relay Welding Failure | Motor relay circuit malfunction | Rack and pinion power steering gear assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
CAUTION / NOTICE / HINT
NOTICE:
If the rack and pinion power steering gear assembly has been replaced, perform assist map writing and torque sensor zero point calibration.
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PROCEDURE
| 1. | CHECK FOR DTC |
(a) Clear the DTCs.
Chassis > EMPS > Clear DTCs(b) Check for DTCs.
Chassis > EMPS > Trouble Codes| Result | Proceed to |
|---|---|
| DTCs other than C1511, C1512, C1513, C1514, C1521, C1522, C1523, C1528, C1531, C1532, C1533, C1534 or C1555 are not output. | A |
| DTCs other than C1511, C1512, C1513, C1514, C1521, C1522, C1523, C1528, C1531, C1532, C1533, C1534 or C1555 are output. | B |
| DTCs are not output. | C |
| A |  | REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY |
| B | | GO TO DIAGNOSTIC TROUBLE CODE CHART |
| C | | USE SIMULATION METHOD TO CHECK |
READ NEXT:
Torque Sensor Zero Point Adjustment Undone (C1515)
DESCRIPTION This DTC does not indicate a malfunction. The power steering ECU (rack and pinion power steering gear assembly) stores this DTC when it determines that torque sensor zero point calibration
Torque Sensor Zero Point Adjustment Incomplete (C1516)
DESCRIPTION This DTC does not indicate a malfunction. The power steering ECU (rack and pinion power steering gear assembly) stores this DTC when it determines that torque sensor zero point calibration
Vehicle Speed Signal (C1541)
DESCRIPTION The power steering ECU (rack and pinion power steering gear assembly) receives vehicle speed signals from the skid control ECU (brake actuator assembly) via CAN communication. The ECU prov
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