Lexus ES: Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
Power Steering System| DTC No. | Detection Item | DTC Detection Condition | Warning Indicate | Return-to-normal Condition | Note | Link |
|---|---|---|---|---|---|---|
| C1511 | Torque Sensor1 | Torque sensor malfunction | EPS warning light: Comes on | Power switch is turned on (IG) again | - | |
| C1512 | Torque Sensor2 | Torque sensor malfunction | EPS warning light: Comes on | Power switch is turned on (IG) again | - | |
| C1513 | Torque Sensor Deviation Excessive | Torque sensor malfunction | EPS warning light: Comes on | Power switch is turned on (IG) again | - | |
| C1514 | Torque Sensor Power Supply Voltage | Torque sensor malfunction | EPS warning light: Comes on | Power switch is turned on (IG) again | - | |
| C1515 | Torque Sensor Zero Point Adjustment Undone | This DTC is stored when torque sensor zero point calibration has not been performed. | EPS warning light: Comes on | Zero point calibration is performed or the power switch is turned on (IG) again | There is no malfunction if this DTC is not output again after performing zero point calibration. | |
| C1516 | Torque Sensor Zero Point Adjustment Incomplete | Torque sensor zero point calibration is incomplete due to the steering wheel being touched during calibration. | EPS warning light: Comes on | The DTC is cleared | 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. | |
| C1521 | Short in Motor Circuit | Motor overcurrent | EPS warning light: Comes on | Power switch is turned on (IG) again | - | |
| C1522 | Power Supply Sensor | Motor current sensor malfunction | EPS warning light: Comes on | Power switch is turned on (IG) again | - | |
| C1523 | Current Deviation Excessive | Excessively large current deviation | EPS warning light: Comes on | Power switch is turned on (IG) again | - | |
| C1528 | Motor Rotation Angle Sensor | Motor rotation angle sensor malfunction | EPS warning light: Comes on | Power switch is turned on (IG) again | - | |
| C1531 | ECU Malfunction | ECU internal malfunction (CPU malfunction) | EPS warning light: Comes on | Power switch is turned on (IG) again | - | |
| C1532 | ECU Malfunction | ECU internal malfunction (Peripheral circuit malfunction) | EPS warning light: Comes on | Power switch is turned on (IG) again | - | |
| C1533 | Temperature Sensor Circuit is Low or High | ECU internal malfunction (Substrate temperature sensor malfunction) | EPS warning light: Comes on | The ECU judges the system has returned to normal | - | |
| C1534 | EEPROM | ECU internal malfunction (EEPROM error) | EPS warning light: Comes on | Power switch is turned on (IG) again | - | |
| C1541 | Vehicle Speed Signal | A vehicle speed signal malfunction is detected | EPS warning light: Comes on | The ECU judges the system has returned to normal | - | |
| C1551 | IG Power Supply Voltage | When the PIG power supply voltage is normal, the IG power supply voltage is 18.5 V or higher | EPS warning light: Comes on | The ECU judges the system has returned to normal | - | |
| C1552 | PIG Power Supply Voltage | PIG power source circuit malfunction | EPS warning light: Comes on | Power switch is turned on (IG) again | - | |
| C1554 | Power Supply Relay Failure | Power source relay circuit malfunction | EPS warning light: Comes on | Power switch is turned on (IG) again | - | |
| C1555 | Motor Relay Welding Failure | Motor relay circuit malfunction | EPS warning light: Comes on | Power switch is turned on (IG) again | - | |
| C1567 | Error in Matching of ECUs |
| EPS warning light: Comes on | The ECU judges the system has returned to normal or the power switch is turned on (IG) again | - | |
| C1581 | Assist Map Number Un-Writing | Assist map not written in power steering ECU (rack and pinion power steering gear assembly) | EPS warning light: Comes on | Assist Map Writing is performed or the power switch is turned on (IG) again | - | |
| C1582 | Assist Map Number Mismatch | Assist map number mismatch | EPS warning light: Does not come on | Assist Map Writing is performed or the power switch is turned on (IG) again | - | |
| U0126 | Lost Communication With Steering Angle Sensor Module | Lost communication with steering angle sensor | EPS warning light: Comes on | The ECU judges the system has returned to normal or the power switch is turned on (IG) again | - | |
| U0129 | Lost Communication with Brake System Control Module | Lost communication with skid control ECU (Brake booster with master cylinder assembly) | EPS warning light: Comes on | The ECU judges the system has returned to normal or the power switch is turned on (IG) again | - | |
| U023A | Lost Communication with Front Camera Module | Lost communication with forward recognition camera | EPS warning light: Does not come on | The ECU judges the system has returned to normal or the power switch is turned on (IG) again | - | |
| U0293 | Lost Communication with Hybrid Control Module | Lost communication with hybrid vehicle control ECU | EPS warning light: Does not come on | The ECU judges the system has returned to normal or the power switch is turned on (IG) again | - | |
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On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. CHECK STEERING EFFORT (TORQUE) NOTICE: These service operations may affect the SRS airbags. Be sure to read the precautionary notices concerning the SRS airbag syste
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 amou
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
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Removal
REMOVAL PROCEDURE 1. REMOVE COOL AIR INTAKE DUCT SEAL Click here 2. REMOVE INLET AIR CLEANER ASSEMBLY Click here 3. REMOVE AIR CLEANER ASSEMBLY WITH AIR CLEANER HOSE Click here 4. REMOVE VACUUM SWITCHING VALVE (for Active Control Engine Mount System) (a) Remove the bolt and disengage t
Installation
INSTALLATION PROCEDURE 1. INSTALL BRAKE BOOSTER GASKET (a) Install a new brake booster gasket to the brake booster assembly. 2. INSTALL BRAKE BOOSTER ASSEMBLY (a) Temporarily install the brake booster assembly to the vehicle body. NOTICE: Do not apply excessive force to the brake lines. (b) Temporar
