C1789

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1789/89: Vehicle Identification Malfunction
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.





INSPECTION PROCEDURE

NOTICE:
- When replacing the suspension control ECU, perform registration Testing and Inspection.
- Do not exchange the suspension control ECU with a normally functioning one from another vehicle to perform troubleshooting.
PROCEDURE

1. PERFORM REGISTRATION

(a) Perform registration Testing and Inspection.

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Clear DTC Air Suspension System.

(b) Check if DTC C1789/89 is output Air Suspension System.

OK:

DTC C1789/89 is not output.

NG -- CHECK PART NUMBER

OK -- END

3. CHECK PART NUMBER

(a) Check that the part number of the installed ECM is correct Removal.

NOTICE:
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.

NG -- REPLACE ECM Removal
OK -- Continue to next step.

4. CLEAR DTC

(a) Clear the DTC Air Suspension System.

NEXT -- Continue to next step.

5. CHECK FOR DTC

(a) Check if DTC C1789/89 is output Air Suspension System.

OK:

DTC C1789/89 is not output.

HINT
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.

NG -- REPLACE SUSPENSION CONTROL ECU Removal

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting