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
The vehicle's suspension control ECU uses ISO 9141-2 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.

Verify the conditions listed in the table:





HINT: If the intelligent tester display shows UNABLE TO CONNECT TO VEHICLE when the cable of the intelligent tester is connected to DLC3, the ignition switch is turned to the ON position and the tester is operated, there is a problem on the vehicle side or tester side.

^ If communication is normal when the tester is connected to another vehicle, inspect DLC3 on the original vehicle.
^ If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tester itself, so 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.

NOTICE:
^ 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 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 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.