Up to 08/2009

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1748: Low Pressure Tank Valve
C1748 - Low Pressure Tank Valve

DESCRIPTION

The low pressure tank valve built into the pneumatic tank assembly opens to store and discharge air in the pneumatic tank according to the signal from the suspension control ECU.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- Before performing troubleshooting, inspect the connectors of related circuits.
- If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first C1782.
- Before replacing the suspension control ECU, perform all of the following again: 1) symptom simulation How To Proceed With Troubleshooting; 2) DTC inspection Reading and Clearing Diagnostic Trouble Codes; and 3) Techstream inspection (Data List or Active Test) Scan Tool Testing and Procedures. If no malfunctions are found in other areas, replace the suspension control ECU.
- If the suspension control ECU is replaced, the vehicle height offset calibration and registration of vehicle identification information must be performed Calibration and Registration)
PROCEDURE

1. INSPECT PNEUMATIC W/TUBE TANK ASSEMBLY (LOW PRESSURE TANK VALVE)

(a) Turn the engine switch off.

(b) Disconnect the low pressure tank valve connector.





(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





Text in Illustration





(d) Inspect if the low pressure tank valve is stuck :

(1) Connect a positive (+) lead from the battery to terminal 2 (B) and a negative (-) lead to terminal 1 (L).

(2) Check the operating sound of the low pressure tank valve.

OK:

It makes an operating sound (click).

NG -- REPLACE PNEUMATIC W/TUBE TANK ASSEMBLY
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - TANK SOLENOID VALVE)

(a) Turn the engine switch off.

(b) Disconnect the A54 ECU connector.

(c) Disconnect the O11 low pressure tank valve connector.

(d) Measure the resistance according to the value(s) in the table below.





Standard resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE SUSPENSION CONTROL ECU