AIR SUSPENSION SYSTEM, Diagnostic DTC:C1783

DTC Code DTC Name
C1783 Speed Signal Communication Error

DESCRIPTION

The suspension control ECU receives wheel speed sensor signals via the CAN communication system from the skid control ECU.

DTC No. DTC Detection Condition Trouble Area
C1783 Detects speed sensor malfunction signals from the skid control ECU for 1 second.

  • Speed sensor circuit

  • Skid control ECU

  • Suspension control ECU

INSPECTION PROCEDURE

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 suspension control ECU, perform all of the following again: 1) symptom simulation Click here; 2) DTC inspection Click here; and 3) Intelligent tester inspection (Data List or Active Test) Click here. If no malfunctions are found in other areas, replace the suspension control ECU.

  • 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 A
      CAN communication system is malfunctioning B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)


    1. Check if the electronically controlled brake system outputs any DTC relevant to speed sensors Click here.

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

    B

    REPLACE SUSPENSION CONTROL ECU (for RHD) Click here

    C

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    A

    REPLACE SUSPENSION CONTROL ECU (for LHD) Click here