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

A01ERC5E02

INSPECTION PROCEDURE

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. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG) and the intelligent tester on.

    4. Enter the following menus: Chassis / AHC / Data List.

    5. According to the display on the intelligent tester, read the Data List.

      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

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

    REPLACE SUSPENSION CONTROL ECU 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 K30 and K31 ECU connectors.

    2. Disconnect the e1 sensor connector.

      A01ESL3E02

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K31-17 (TOIL) - e1-2 (TOIL) Always Below 1 Ω
      K31-17 (TOIL) - Body ground Always 10 kΩ or higher
      K31-18 (STG) - e1-1 (SBL) Always Below 1 Ω
      K31-18 (STG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT FLUID TEMPERATURE SENSOR


    1. Connect the e1 temperature sensor connector.

    2. A01EOA9E02

      Disconnect the K30 and K31 ECU connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K31-17 (TOIL) - K31-18 (STG) 20°C (68°F) 2.32 to 2.59 kΩ

    NG

    REPLACE HEIGHT CONTROL PUMP AND MOTOR Click here

    OK

    REPLACE SUSPENSION CONTROL ECU Click here