AIR SUSPENSION SYSTEM, Diagnostic DTC:C1761

DTC Code DTC Name
C1761 Continuous Current to Compressor Motor

DESCRIPTION

The signal from the suspension control ECU operates the AIR SUS relay and the height control compressor motor starts. The height control compressor motor operates until the targeted vehicle height is reached. Then the height control sensor sends the signal to the suspension control ECU, and stops the height control compressor motor.

DTC Code DTC Detection Condition Trouble Area
C1761

Either condition is met a total of 2 times or more with the ignition switch ON:


  • Power is continuously supplied to the height control compressor motor for 100 seconds.

  • Power is supplied to the height control compressor motor for 100 seconds or more within a 240 second period.

  • Air leakage from air tube or each valve

  • Clogging in air tube or each valve

  • AIR SUS relay (Suspension control relay)

  • Leveling solenoid valve (No. 2 height control valve)

  • Gate solenoid valve (No. 2 height control valve)

  • Exhaust valve (Height control compressor)

  • Compressor motor (Height control compressor)

  • Suspension control ECU

CAUTION / NOTICE / HINT

Note

When replacing the suspension control ECU, perform registration Click here.

Tech Tips

If DTC C1782 is output at the same time, perform troubleshooting for C1782 first Click here.

PROCEDURE


  1. CUSTOMER PROBLEM ANALYSIS


    1. Ask the customer about the vehicle and usage conditions when the DTC was stored.

      Tech Tips

      DTC C1761 can be stored under unusual vehicle or usage conditions.

      Points to confirm

      • Confirm if there were any foreign objects caught between the body and tires.

      • Confirm if the vehicle has been driven on an unpaved surface or with a wheel not contacting the ground.

      • Confirm if the vehicle has been raised with an excess load.

      • Confirm if the vehicle height mode has been continuously changed using the height control switch, causing the vehicle to raise and lower repeatedly.

    NEXT

  2. CHECK DTC


    1. Clear the DTC Click here.

    2. Start the engine and wait for 4 minutes or more.

    3. Set the vehicle height to HI, wait until the vehicle height change is complete, and then return the vehicle height to normal.

    4. Check the DTC Click here.

      Result
      Result Proceed to
      DTC C1761 is output A
      DTC C1761 is not output B
      DTC C1761 and other DTCs are output C

    B

    END (C1761 WAS OUTPUT DUE TO UNUSUAL VEHICLE OR USAGE CONDITION)

    C

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  3. INSPECT AIR TUBE FOR AIR LEAK OR CLOG


    1. Inspect the air tube for air leaks or clogs Click here.

      OK
      No air leaks or clogs are found in the air tube.

    NG

    REPAIR OR REPLACE AIR TUBE

    OK

  4. INSPECT NO. 2 HEIGHT CONTROL VALVE


    1. Turn the ignition switch off.

    2. Remove the No. 2 height control valve Click here.

    3. B001COZE18
      Text in Illustration
      *a

      Component without harness connected

      (No. 2 Height Control Valve)

      Measure the resistance according to the values in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (LH+) - 2 (E) 15 to 25°C (59 to 77°F) 17.5 to 21.5 Ω
      3 (RH+) - 2 (E) 15 to 25°C (59 to 77°F) 10 to 14 Ω

    4. Check the leveling solenoid valve.


      1. Connect the positive (+) lead of the battery to terminal 3 (RH+) and the negative (-) lead to terminal 2 (E).

      2. Check the operating sound of the No. 2. height control valve

        OK
        It makes an operating sound (click).

    5. Check the gate solenoid valve.


      1. Connect the positive (+) lead of the battery to terminal 1 (LH+) and the negative (-) lead to terminal 2 (E).

      2. Check the operating sound of the No. 2. height control valve.

        OK
        It makes an operating sound (click).

    NG

    REPLACE NO. 2 HEIGHT CONTROL VALVE Click here

    OK

  5. INSPECT HEIGHT CONTROL COMPRESSOR (EXHAUST SOLENOID VALVE)

    Click here


    NG

    REPLACE HEIGHT CONTROL COMPRESSOR ASSEMBLY Click here

    OK

  6. INSPECT HEIGHT CONTROL COMPRESSOR (COMPRESSOR MOTOR)

    Click here


    NG

    REPLACE HEIGHT CONTROL COMPRESSOR ASSEMBLY Click here

    OK

  7. INSPECT SUSPENSION CONTROL RELAY (AIR SUS)

    Click here


    OK

    REPLACE SUSPENSION CONTROL ECU Click here

    NG

    REPLACE SUSPENSION CONTROL RELAY (AIR SUS)