AIR SUSPENSION SYSTEM, Diagnostic DTC:C174514

DTC Code DTC Name
C174514 Exhaust Solenoid Circuit Circuit Short to Ground or Open

DESCRIPTION

The exhaust valve is installed to the NO. 1 height control compressor. The solenoid valve is opened by signals from the suspension control ECU and releases the high air pressure in the system to the atmosphere.

The exhaust solenoid operates until the target vehicle height is achieved. When achieved, the height control sensor outputs a signal to the suspension control ECU to stop the operation of the exhaust solenoid.

DTC NO. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
C174514 Exhaust Solenoid Circuit Circuit Short to Ground or Open With the exhaust valve (NO. 1 height control compressor) not activated, an open signal of the exhaust valve (NO. 1 height control compressor) is detected for 1 second or more.

  • Wire harness or connector

  • Exhaust Valve (NO. 1 height control compressor)

  • Suspension control ECU

 Comes on Yes

WIRING DIAGRAM

B004TFSE01
*a Exhaust Valve (NO. 1 Height Control Compressor)
*b Suspension Control ECU

CAUTION / NOTICE / HINT

Note


  • Before performing troubleshooting, inspect the connectors of related circuits.

  • After replacing the suspension control ECU with a new one, perform vehicle height offset.

    Click here

PROCEDURE


  1. INSPECT EXHAUST VALVE (NO. 1 HEIGHT CONTROL COMPRESSOR)


    1. Inspect the exhaust valve (NO. 1 height control compressor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 HEIGHT CONTROL COMPRESSOR Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (EXHAUST VALVE (NO. 1 HEIGHT CONTROL COMPRESSOR) - SUSPENSION CONTROL ECU)


    1. Turn the power switch off.

    2. Disconnect the L104 suspension control ECU connector.

    3. Disconnect the L182 exhaust valve (NO. 1 height control compressor).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L104-3 (SLEX) - L182-2 (B) Always Below 1 Ω
      L182-1 (L) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SUSPENSION CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR