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)

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 Inspection

INSPECTION PROCEDURE 1. INSPECT VACUUM PUMP VANE (a) Check that the vacuum pump vane or vacuum pump vane caps are not damaged or excessively worn. HINT: If the vacuum pump vane or vacuum pump vane caps are damaged or excessively worn, replace the damaged parts with new ones. *1 Vac

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INSTALLATION PROCEDURE 1. INSTALL CAMSHAFT TIMING GEAR BOLT (a) Make sure that the No. 1 cylinder is at TDC/compression. HINT: Check that the cutout of the camshaft timing gear assembly is at the top and align the timing mark (cutout) of the crankshaft pulley with the timing mark on the timing chain

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