ACTIVE HEIGHT CONTROL SUSPENSION, Diagnostic DTC:C1719

DTC Code DTC Name
C1719 Oil Temperature Sensor Circuit Malfunction

DESCRIPTION

This circuit is used for sending the data to detect the fluid temperature of the pump. The abnormality of the fluid is judged by the ECU.

DTC Code Detection Condition Trouble Area
C1719

When one of the following conditions is met:


  • When detecting an abnormal signal from the fluid temperature sensor (fluid temperature sensor terminal voltage of ECU is 0.1 V or less or 4.8 V or higher) for 1 second.

  • When there is a fluid temperature sensor power supply voltage malfunction.

  • Harness or connector

  • Height control pump and motor (Fluid temperature sensor)

  • Suspension control ECU

WIRING DIAGRAM

B001WYQE01
*a TOIL
*b STG
*c Fluid Temperature Sensor
*d Suspension Control ECU

CAUTION / NOTICE / HINT

Note


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

  • If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Click here.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (OIL TEMPERATURE SENSOR)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and the tester on.

    3. Select the Data List mode on the intelligent tester.

    4. Check the fluid temperature value of the temperature sensor displayed on the intelligent tester.

      AHC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Oil Temperature Sensor

      Fluid temperature sensor reading /

      min.: -3276.8°C (-5866.24°F)

      max.: 3276.7°C (5930.06°F)

      		 Actual fluid temperature -
      OK
      Same as actual fluid temperature

    NG

    CHECK HARNESS AND CONNECTOR (TEMPERATURE SENSOR - SUSPENSION CONTROL ECU) Click here

    OK

  2. RECONFIRM DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Perform a road test.

    3. Check for DTCs.

      Result
      Result Proceed to
      DTC C1719 is output A
      DTC C1719 is not output B

    A

    REPLACE SUSPENSION CONTROL ECU Click here

    B

    USE SIMULATION METHOD TO CHECK Click here

  3. CHECK HARNESS AND CONNECTOR (TEMPERATURE SENSOR - SUSPENSION CONTROL ECU)

    Note

    When inspecting the wire harness between the suspension control ECU and temperature sensor, it is difficult to determine the malfunctioning area if there is a sensor power supply malfunction. Therefore, disconnect the connectors for the temperature sensor, the acceleration sensors (front RH, front LH) and pressure accumulator sensor on the ECU side.


    1. Disconnect the K34 and K35 ECU connectors.

    2. Disconnect the i1 sensor connector.

      B001X3YE02

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K35-17 (TOIL) - i1-2 (TOIL) Always Below 1 Ω
      K35-17 (TOIL) - Body ground Always 10 kΩ or higher
      K35-18 (STG) - i1-1 (SBL) Always Below 1 Ω
      K35-18 (STG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT FLUID TEMPERATURE SENSOR


    1. Connect the i2 temperature sensor connector.

    2. B001WRLE02
      *1 Rear view of wire harness connector: (to Suspension Control ECU)
      *2 18 (STG)
      *3 17 (TOIL)

      Disconnect the K34 and K35 ECU connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K35-17 (TOIL) - K35-18 (STG) 20°C (68°F) 2.32 to 2.59 kΩ

    OK

    REPLACE SUSPENSION CONTROL ECU Click here

    NG

    REPLACE HEIGHT CONTROL PUMP AND MOTOR Click here