AIR SUSPENSION SYSTEM, Diagnostic DTC:C1782

DTC Code DTC Name
C1782 Power Source Voltage Malfunction

DESCRIPTION

DTC No. Detection Condition Trouble Area
1782/82 While engine switch is on (IG), detection that voltage at terminal B is 10 V or less, or 16 V or more for 0.5 seconds

  • Battery

  • Charging system

  • Suspension control ECU

WIRING DIAGRAM

A01GN2IE04

INSPECTION PROCEDURE

Note


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

  • Before replacing the suspension control ECU, perform all of the following again: 1) symptom simulation Click here; 2) DTC inspection; and 3) intelligent tester inspection (ECU Data List or Active Test). If no malfunctions are found in other areas, replace the suspension control ECU.

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

PROCEDURE


  1. CHECK IG VOLTAGE (DATA LIST)


    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

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

    4. Enter the following menus: Chassis / Air suspension / Data List /

    5. According to the display on the tester.

      Air suspension
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG Power Source Voltage

      ECU power supply voltage/

      min.: 0.0 V

      max.: 25.5 V

      		 Engine switch on (IG): 11 to 14 V -
      OK
      11 to 14 V
      Result
      Result Proceed to
      NG A
      OK B

    B

    CHECK DTC Click here

    A

  2. CHECK BATTERY VOLTAGE


    1. A01GLWFE15

      Disconnect the L88 ECU connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      L88-1 (B) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (1UR-FSE) B
      NG (1UR-FE) C

    B

    BATTERY VOLTAGE IS LOW OR CHARGING SYSTEM HAS MALFUNCTION Click here

    C

    BATTERY VOLTAGE IS LOW OR CHARGING SYSTEM HAS MALFUNCTION Click here

    A

  3. CHECK DTC


    1. Clear the DTC Click here.

    2. Check for DTC Click here.

      Result
      Condition Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

    B

    REPLACE SUSPENSION CONTROL ECU (for LHD) Click here

    C

    REPLACE SUSPENSION CONTROL ECU (for RHD) Click here

    A

    USE SIMULATION METHOD TO CHECK Click here