AIR SUSPENSION SYSTEM, Diagnostic DTC:C1789/89

DTC Code DTC Name
C1789/89 Vehicle Identification Malfunction

DESCRIPTION

  • This DTC is stored when the suspension control ECU is initialized and is cleared when the vehicle identification information received through CAN communication system is correctly stored in the EEPROM.

  • DTC C1789/89 is stored when an incorrect ECM is installed as the vehicle specification and data do not match.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

C1789/89

Vehicle Identification Malfunction

Either condition is met:

  • The vehicle identification information is not stored.

  • The information stored in the suspension control ECU and the vehicle identification information received through CAN communication system do not match.

  • Suspension control ECU

  • ECM

Not indicated

CAUTION / NOTICE / HINT

Note:

  • When replacing the suspension control ECU, perform registration (Click here).

  • Do not exchange the suspension control ECU with a normally functioning one from another vehicle to perform troubleshooting.

PROCEDURE

  1. PERFORM REGISTRATION

    1. Perform registration.

      Click here

      Result

      Result

      NEXT

      Chassis > Air suspension > Utility

      Tester Display

      Signal Check
    NEXT

  2. CHECK FOR DTC

    1. Clear the DTC.

      Click here

      Chassis > Air suspension > Clear DTCs

    2. Check if DTC C1789/89 is output.

      Click here

      OK

      DTC C1789/89 is not output.

      Chassis > Air suspension > Trouble Codes

      Result

      Result

      OK

      NG
    OK

    END

    NG

  3. CHECK PART NUMBER

    1. Check that the part number of the installed ECM is correct.

      Click here

      Note:

      When removing the ECM to check the part number, or when replacing the ECM, be sure to follow the appropriate procedures and precautions.

      OK

      ECM with correct part number is installed.

      Result

      Result

      OK

      NG
    NG

    REPLACE ECM

    Click here

    OK

  4. CLEAR DTC

    1. Clear the DTC.

      Click here

      Chassis > Air suspension > Clear DTCs

      Result

      Result

      NEXT
    NEXT

  5. CHECK FOR DTC

    1. Check if DTC C1789/89 is output (Click here).

      Click here

      OK

      DTC C1789/89 is not output.

      Tip:

      If no parts are replaced and DTC C1789/89 is output, there may be an internal malfunction in the suspension control ECU. In this case, replace the suspension control ECU.

      Chassis > Air suspension > Trouble Codes

      Result

      Result

      OK

      NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click here

    NG

    REPLACE SUSPENSION CONTROL ECU

    Click here