AIR SUSPENSION SYSTEM, Diagnostic DTC:C1781/81

DTC Code DTC Name
C1781/81 Suspension Control ECU Malfunction

DESCRIPTION

If a malfunction in the suspension control ECU is detected, DTC C1781/81 is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

C1781/81

Suspension Control ECU Malfunction

One of the following conditions is met:

  • A nonvolatile memory malfunction

  • A CAN communication resistor malfunction

  • A main relay lock-up malfunction

Suspension control ECU

Indicated

CAUTION / NOTICE / HINT

Note:

When replacing the suspension control ECU, perform registration (Click here).

Tip:

If DTC C1782/82 is output at the same time as C1781/81, perform the inspection necessary for DTC C1782/82 first (Click here).

PROCEDURE

  1. CHECK FOR DTC

    1. Clear the DTC.

      Click here

      Chassis > Air suspension > Clear DTCs

    2. Perform a road test.

    3. Check for DTC.

      Click here

      Chassis > Air suspension > Trouble Codes

      Result

      Result

      Proceed to

      DTC is output

      A

      DTC is not output

      B
    A

    REPLACE SUSPENSION CONTROL ECU

    Click here

    B

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here