Diagnosis System

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: DIAGNOSIS SYSTEM

DIAGNOSIS SYSTEM

1. INSPECT THE BATTERY VOLTAGE
Battery voltage:
11 to 14 V
If the voltage is below 11 V, recharge the battery before proceeding.






2. CHECK DLC3
HINT: The ECU uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.





NOTE: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.
HINT: Connect the cable of the intelligent tester to the DLC3, turn the ignition switch ON position and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.
- If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
- If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.

3. INDICATOR LIGHT






(a) During the vehicle height control operation, the height control OFF indicator light blinks when there is any malfunction in the Air Suspension System.
- When the malfunction has been corrected, the height control OFF indicator light does not come on.
- The height control OFF indicator light does not illuminate when all problems occur Symptom Related Diagnostic Procedures for the items that make the height control OFF indicator light comes on.

4. DTCs (NORMAL MODE)
(a) DTCs are memorized in the suspension control ECU and read by the blinks of the height control OFF indicator light or using the intelligent tester Reading and Clearing Diagnostic Trouble Codes for the procedure of DTCs check.
5. TEST MODE
(a) By switching from normal mode into test mode (input signal check), you can inspect the stop light switch assembly, rear speed sensor, height control switch, height control OFF switch, engine speed signal, access mode switch.
6. CHECK INDICATOR LIGHT






(a) Turn the ignition switch to the ON position.

(b) Check that the height control OFF indicator light, height control indicator light and the access mode indicator light come on for 2 sec.
If the indicator check result is not normal, proceed to the troubleshooting for the indicator light circuit.