ADAPTIVE VARIABLE SUSPENSION SYSTEM, Diagnostic DTC:C1781

DTC Code DTC Name
C1781 Suspension Control ECU Malfunction

DESCRIPTION

If a malfunction in the absorber control ECU (front acceleration sensor RH) is detected, DTC C1781 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Note
C1781 Suspension Control ECU Malfunction

Either condition is met:


  • A nonvolatile memory write or read error occurs.

  • A CAN communication register is stuck.

  • An overheat protection function malfunction occurs.

  • Absorber control ECU (front acceleration sensor RH)

  • CAN communication system

 Does not come on -

CAUTION / NOTICE / HINT

Note


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

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

    Click here

  • Before replacing the absorber control ECU (front acceleration sensor RH), perform all of the following:


    • Symptom simulation.

      Click here

    • DTC inspection.

      Click here

    • GTS inspection.

      Click here


      • If no malfunctions are found in other areas, replace the absorber control ECU (front acceleration sensor RH).

  • After replacing the absorber control ECU (front acceleration sensor RH) with a new one, perform registration of vehicle identification information.

    Click here

PROCEDURE


  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


    1. Check for DTCs.

      Click here


      Chassis > Air suspension > Trouble Codes
      Result
      Result Proceed to
      CAN DTCs are not output A
      CAN DTCs are output B

    A

    REPLACE ABSORBER CONTROL ECU (FRONT ACCELERATION SENSOR RH) Click here

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) for LHD: Click here
    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) for RHD: Click here