AIR SUSPENSION SYSTEM, Diagnostic DTC:C1782

DTC Code DTC Name
C1782 Power Source Voltage Malfunction

DESCRIPTION

DTC No. Detection Condition Trouble Area
1782 While power switch is ON (IG), voltage at terminal B is 10 V or less, or 16 V or more for 0.5 seconds

  • Auxiliary battery

  • Charging system

  • Suspension control ECU

WIRING DIAGRAM

A01GWMIE07

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 (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 power switch OFF.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch ON (IG) and the tester ON.

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

    5. Using the intelligent tester, read the Data List.

      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

      		 Power switch is ON (IG): 11 to 14 V -
      OK
      11 to 14 V

    NG

    CHECK AUXILIARY BATTERY VOLTAGE Click here

    OK

  2. CHECK DTC


    1. Clear the DTC Click here.

    2. Check for DTC Click here.

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

    B

    REPLACE SUSPENSION CONTROL ECU Click here

    C

    REPLACE SUSPENSION CONTROL ECU Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  3. CHECK AUXILIARY BATTERY VOLTAGE


    1. A01GXK9E18

      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 Power switch ON (IG) 11 to 14 V

    NG

    GO TO HYBRID CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    OK

  4. CHECK DTC


    1. Clear the DTC Click here.

    2. Check for DTC Click here.

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

    B

    REPLACE SUSPENSION CONTROL ECU Click here

    C

    REPLACE SUSPENSION CONTROL ECU Click here

    A

    USE SIMULATION METHOD TO CHECK Click here