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 is output.

DTC No. DTC Detection Condition Trouble Area
C1781

When one of the following conditions is met:


  • Non-volatile memory malfunction

  • CAN communication resistor malfunction

  • Main relay lock-up malfunction

  • CAN communication system

  • Suspension control ECU

INSPECTION PROCEDURE

Note


  • If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first Click here.

  • If the suspension control ECU is replaced, the vehicle height offset calibration and registration of vehicle identification information must be performed Click here and Click here

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check the CAN communication system for any malfunctions Click here.

      Result
      Condition Proceed to
      CAN communication system is normal (for LHD) A
      CAN communication system is normal (for RHD) B
      CAN communication system is malfunctioning C

    B

    REPLACE SUSPENSION CONTROL ECU (for RHD) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

    REPLACE SUSPENSION CONTROL ECU (for LHD) Click here