AIR SUSPENSION SYSTEM, Diagnostic DTC:C177DA2

DTC Code DTC Name
C177DA2 Supply Voltage Circuit +B Open

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
C177DA2 Supply Voltage Circuit +B Open While engine switch is ON (IG), BAT terminal voltage is 3 V or less and IG terminal voltage is 9 V or higher for 10 seconds

  • AIRSUS NO.2 fuse

  • LUG-IG1 NO.2 fuse

  • Wire harness or connector

  • Suspension control ECU

 Does not come on Yes

WIRING DIAGRAM

B006FLYE07

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.

    Click here

PROCEDURE


  1. CHECK TERMINAL VOLTAGE (IG TERMINAL, BAT 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 Switch Condition Specified Condition
      L105-8 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      L105-1 (BAT) - Body ground Always 11 to 14 V

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

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK FOR DTCS


    1. Clear the DTCs.

      Click here


      Chassis > Air suspension > Clear DTCs

    2. Turn the engine switch off.

    3. Check for DTCs.

      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