AIR SUSPENSION SYSTEM, Diagnostic DTC:C1782/82

DTC Code DTC Name
C1782/82 Low Battery Positive Voltage

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

C1782/82

Low Battery Positive Voltage

The voltage at terminal IG or B is 10 V or less or 16 V or higher for 0.5 seconds.

  • Battery

  • Charging system

  • AIR SUS fuse

  • AIR SUS NO. 2 fuse

  • AVS fuse

  • Harness or connector

  • Suspension control ECU

Not indicated

WIRING DIAGRAM

C218589E03

CAUTION / NOTICE / HINT

Note:

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

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER (IG/+B POWER SOURCE VOLTAGE)

    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the intelligent tester on.

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

      Chassis > Air suspension > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      IG Power Source Voltage

      Actual ECU power supply voltage

      Min.: 0.0 V

      Max.: 25.5 V

      Engine switch on (IG): 11 to 14 V

      -

      +B Power Source Voltage

      Actual battery 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 (When troubleshooting according to problem symptoms table)

      B

      OK (When troubleshooting according to DTC chart)

      C
    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    C

    USE SIMULATION METHOD TO CHECK

    Click here

    A

  2. CHECK TERMINAL VOLTAGE (IG, B)

    1. Disconnect the A40 suspension control ECU connector.

    2. C216018C01

      *a

      Front view of wire harness connector

      (to Suspension Control ECU)

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      A40-3 (B) - Body ground

      Always

      11 to 14 V

      A40-1 (IG) - Body ground

      Engine switch on (IG)

      11 to 14 V

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - BODY GROUND)

    1. Disconnect the A40 and R22 suspension control ECU connectors.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      R22-10 (GND) - Body ground

      Always

      Below 1 Ω

      A40-5 (GND) - Body ground

      Always

      Below 1 Ω

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK FOR DTC

    1. Clear the DTC.

      Click here

      Chassis > Air suspension > Clear DTCs

    2. Check the DTC.

      Click here

      Chassis > Air suspension > Trouble Codes

      Result

      Result

      Proceed to

      DTC is not output

      A

      DTC is output

      B
    A

    USE SIMULATION METHOD TO CHECK

    Click here

    B

    REPLACE SUSPENSION CONTROL ECU

    Click here