Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Short in Motor Circuit (C1521-C1523,C1528,C1531-C1555)
DESCRIPTION
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Return-to-normal Condition | Note |
|---|---|---|---|---|---|---|
| C1521 | Short in Motor Circuit | Motor overcurrent | Power steering ECU assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1522 | Power Supply Sensor | Motor current sensor malfunction | Power steering ECU assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1523 | Current Deviation Excessive | Excessively large current deviation | Power steering ECU assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1528 | Motor Rotation Angle Sensor | Motor rotation angle sensor malfunction | Power steering ECU assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1531 | ECU Malfunction | ECU internal malfunction (CPU malfunction) | Power steering ECU assembly | EPS warning light: Comes on | The ECU judges the system has returned to normal or the power switch is turned on (IG) again | - |
| C1532 | ECU Malfunction | ECU internal malfunction (Peripheral circuit malfunction) | Power steering ECU 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) | Power steering ECU assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1534 | EEPROM | ECU internal malfunction (EEPROM error) | Power steering ECU assembly | EPS warning light: Comes on | Engine switch on (IG) again | - |
| C1555 | Motor Relay Welding Failure | Motor relay circuit malfunction | Power steering ECU assembly | EPS Warning Light: Comes on | Engine switch on (IG) again | - |
CAUTION / NOTICE / HINT
NOTICE:
If the power steering ECU 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.
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(b) Check for DTCs.
Click here
| Result | Proceed to |
|---|---|
| DTCs other than C1521, C1522, C1523, C1528, C1531, C1532, C1533, C1534 or C1555 are not output. | A |
| DTCs other than C1521, C1522, C1523, C1528, C1531, C1532, C1533, C1534 or C1555 are output. | B |
| A | .gif) | REPLACE POWER STEERING ECU ASSEMBLY |
| B | | GO TO DIAGNOSTIC TROUBLE CODE CHART |
Torque Sensor Zero Point Adjustment Incomplete (C1516)
DESCRIPTION This DTC does not indicate a malfunction. The power steering ECU assembly stores this DTC when it determines that torque sensor zero point calibration has not completed. DTC No. Detec ...
Vehicle Speed Signal (C1541)
DESCRIPTION The power steering ECU assembly receives vehicle speed signals from the skid control ECU (brake actuator assembly) via CAN communication. The ECU provides appropriate assist force in accor ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Steering Gear: Components
COMPONENTS ILLUSTRATION *A for TMC Made *B for TMMC Made *1 NO. 2 ENGINE UNDER COVER *2 STEERING INTERMEDIATE SHAFT ASSEMBLY *3 TIE ROD ASSEMBLY LH *4 COTTER PIN Tightening torque for "Major areas involving basic vehicle performance such as moving/turning/stoppin ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Can Communication System: Main Body ECU Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Main Body ECU Communication Stop Mode Either condition is met:
"Main Body" is not displayed on the CAN Bus Check screen of the Techstream.
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Communication system DTCs (DTCs that start with U) that correspond to "Main Bod ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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