Diagnosis System

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: DIAGNOSIS SYSTEM

DIAGNOSIS SYSTEM

1. DIAGNOSIS SYSTEM





(a) Inspect the battery voltage.
Battery voltage:
11 to 14 V
If voltage is below 11 V, recharge the battery before proceeding.

(b) Check DLC3.
The suspension control ECU uses the ISO 9141-2 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.
Verify the conditions listed in the table below:





HINT:
If the display indicates that a communication error occurred, there is a problem either with the vehicle or with the Techstream.
- If communication is normal when the Techstream is connected to another vehicle, inspect the 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 Techstream itself, so consult the service department listed in the Techstream's instruction manual.

(c) DTCs (Normal mode)
(1) DTCs are memorized in the suspension control ECU and read by using the SST check wire or the Techstream Reading and Clearing Diagnostic Trouble Codes.
SST: 09843-18040
(d) Test mode (Input signal check)
(1) By switching from normal mode into test mode, you can inspect the height control switch, height control mode select switch, door courtesy light switch, and stop light switch Test Mode Procedure.





(e) Check the indicator light.
(1) Turn the ignition switch to the ON position.
(2) Check that the height control manual indicator light and the height control indicator light come on for 2 seconds.
If the indicator check result is not normal, proceed to troubleshooting for the height control indicator light circuit Height Control Indicator Light Circuit and the height control OFF indicator light circuit Height Control OFF Indicator Light Circuit.