Lexus ES manuals

Lexus ES: Engine Circuit Malfunction (C1280)

Lexus ES (XZ10) Service Manual / Drivetrain / Gf1a (transfer / 4wd / Awd) / Dynamic Torque Control Awd System / Engine Circuit Malfunction (C1280)

DESCRIPTION

If a malfunction in the ECM circuit occurs, the 4WD ECU assembly will output this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1280

Engine Circuit Malfunction

When the following continues for 5 seconds or more:

  • Communication with ECM is operating normally, but engine control system is malfunctioning.
  • Engine control system
  • 4WD ECU assembly

PROCEDURE

1.

CHECK FOR DTC (ENGINE CONTROL SYSTEM)

(a) Check if the engine control system DTC is output.

Powertrain > Engine > Trouble Codes

Result

Proceed to

Engine control system DTC is not output

A

Engine control system DTC is output

B
A

REPLACE 4WD ECU ASSEMBLY

B

GO TO ENGINE CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART)

READ NEXT:

 ABS Malfunction (C1296)

DESCRIPTION If a malfunction in the speed sensor signal circuit or yaw rate and acceleration sensor (airbag ECU assembly) circuit occurs, the 4WD ECU assembly will output this DTC. The airbag ECU asse

 Steering Angle Sensor (C1297)

DESCRIPTION The 4WD ECU assembly determines that the vehicle is turning based on the signals sent from the steering sensor. The steering sensor signal is sent to the 4WD ECU assembly via CAN communica

 Linear Solenoid Circuit (C1298)

DESCRIPTION The 4WD ECU assembly receives signals from each sensor to control clutch fluid pressure for limiting the center differential operation, which distributes torque according to the driving co

SEE MORE:

 Inspection

INSPECTION PROCEDURE 1. INSPECT STEERING COLUMN ASSEMBLY (a) Check that the 2 bushings are securely installed to the steering column assembly. HINT: If the bushings are deformed, missing or damaged, replace the steering column assembly with a new one.

 Problem Symptoms Table

PROBLEM SYMPTOMS TABLE NOTICE: After replacing the radio receiver assembly of vehicles subscribed to pay-type satellite radio broadcasts, registration of the XM radio ID is necessary (w/ SXM Function). If the DCM (telematics transceiver) has been replaced, perform the DCM Activation procedure.

© 2016-2025 Copyright www.lexguide.net