AIR SUSPENSION SYSTEM, Diagnostic DTC:C123A14

DTC Code DTC Name
C123A14 Supply Voltage Circuit IG Open

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
C123A14 Supply Voltage Circuit IG Open

  • When the suspension control ECU recognizes the engine switch condition as on, engine switch off signals from the main body ECU (multiplex network body ECU) via CAN communication are received for 10 seconds or more.

  • Wire harness or connector

  • Suspension control ECU

  • Main body ECU (multiplex network body ECU)

 Does not come on Yes

WIRING DIAGRAM

B006H0LE01

CAUTION / NOTICE / HINT

Note


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

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

  • After replacing the Suspension Control ECU with a new one, perform vehicle height offset calibration.

    Click here

PROCEDURE


  1. READ VALUE USING GTS (IG SW Signal)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

      OK
      The values are as specified in the normal condition column.

      Chassis > 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

      		 11 to 14 V: Engine switch on (IG) -

      Chassis > Air suspension > Data List
      Tester Display
      IG Power Source Voltage
      Result
      Result Proceed to
      OK A
      NG B

    A

    REPAIR MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) IG CIRCUIT

    B

  2. CHECK HARNESS AND CONNECTOR (IG TERMINAL)


    1. Turn the engine switch off.

    2. Disconnect the L105 suspension control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L105-8 (IG) - Body ground Engine switch on (IG) 11 to 14 V

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L105-3 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SUSPENSION CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR