AIR SUSPENSION SYSTEM, Diagnostic DTC:C1781

DTC Code DTC Name
C1781 Suspension Control ECU Malfunction

DESCRIPTION

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

DTC No. Detection Condition Trouble Area
C1781/81 Suspension control ECU malfunction is detected Suspension control ECU

INSPECTION PROCEDURE

Note


  • Before performing troubleshooting, inspect the connectors of related circuits.

  • If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Click here.

PROCEDURE


  1. CHECK DTC


    1. Clear the DTC Click here.

    2. Perform a road test.

    3. Check for DTC Click here.

      Result
      Condition Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

    B

    REPLACE SUSPENSION CONTROL ECU (for LHD) Click here

    C

    REPLACE SUSPENSION CONTROL ECU (for RHD) Click here

    A

    USE SIMULATION METHOD TO CHECK Click here