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 (rear acceleration sensor) 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 (rear acceleration sensor)

  • 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.

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  • Before replacing the absorber control ECU (rear acceleration sensor), 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 (rear acceleration sensor).

  • When the absorber control ECU (rear acceleration sensor) is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met.

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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 (REAR ACCELERATION SENSOR) Click here

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here