AIR SUSPENSION SYSTEM, Diagnostic DTC:C174312, C174412

DTC Code DTC Name
C174312 RR Height Control Solenoid Circuit Circuit Short to Battery
C174412 RL Height Control Solenoid Circuit Circuit Short to Battery

DESCRIPTION

The NO. 2 height control valve sub-assembly opens and closes the right and left circuit lines to the rear wheel side pneumatic cylinder assembly with shock absorber independently using the signal from the suspension control ECU.

DTC NO. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
C174312 RR Height Control Solenoid Circuit Circuit Short to Battery With the NO. 2 height control valve sub-assembly activated, a short signal of the NO. 2 height control valve sub-assembly is detected for 1 second or more.

  • Wire harness or connector

  • NO. 2 height control valve sub-assembly

  • Suspension control ECU

 Comes on Yes
C174412 RL Height Control Solenoid Circuit Circuit Short to Battery With the NO. 2 height control valve sub-assembly activated, a short signal of the NO. 2 height control valve sub-assembly is detected for 1 second or more.

  • Wire harness or connector

  • NO. 2 height control valve sub-assembly

  • Suspension control ECU

 Comes on Yes

WIRING DIAGRAM

B004XWEE03

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 NO. 2 HEIGHT CONTROL VALVE SUB-ASSEMBLY


    1. Inspect the NO. 2 height control valve sub-assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 HEIGHT CONTROL VALVE SUB-ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (NO. 2 HEIGHT CONTROL VALVE SUB-ASSEMBLY - SUSPENSION CONTROL ECU)


    1. Turn the power switch off.

    2. Disconnect the L104 suspension control ECU connector.

    3. Disconnect the L177 NO. 2 height control valve sub-assembly.

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

      Standard Resistance
      C174312:
      Tester Connection Condition Specified Condition
      L104-1 (SLRR) - L177-1 (+RH) Always Below 1 Ω
      L104-1 (SLRR) or L177-1 (+RH) - Body ground and other terminals Always 10 kΩ or higher
      C174412:
      Tester Connection Condition Specified Condition
      L104-2 (SLRL) - L177-3 (+LH) Always Below 1 Ω
      L104-2 (SLRL) or L177-3 (+LH) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SUSPENSION CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR