ACTIVE STABILIZER SUSPENSION SYSTEM, Diagnostic DTC:C1938

DTC Code DTC Name
C1938 Malfunction in Front Active Stabilizer Control ECU Short Relay Power Supply IC

DESCRIPTION

When a malfunction is detected in the motor short relay power supply IC of the front active stabilizer control ECU, DTC C1938 is output.

DTC No. DTC Detection Condition Trouble Area
C1938 Malfunction is detected in motor short relay power supply IC of front active stabilizer control ECU

  • Front active stabilizer control actuator assembly

  • Front active stabilizer control ECU

WIRING DIAGRAM

Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION


    1. Turn the power switch off.

    2. Check that the wire harness connectors between the front active stabilizer control ECU and front active stabilizer control actuator assembly are not loose or disconnected and that the wire harness is not damaged.

      OK
      Connectors are not loose or disconnected. Wire harness is not damaged.

      Tech Tips

      If the wire harness of the front active stabilizer control actuator assembly is damaged, replace the front active stabilizer control actuator assembly Click here.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (FRONT ACTIVE STABILIZER CONTROL ACTUATOR ASSEMBLY - FRONT ACTIVE STABILIZER ECU)


    1. Turn the power switch off.

    2. Disconnect the g15 and g14 ECU connectors.

    3. Disconnect the g17 and g16 actuator connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      g14-1 (W) - g16-1 (W) Always Below 1 Ω
      g14-1 (W) - Body ground Always 10 kΩ or higher
      g14-2 (U) - g16-2 (U) Always Below 1 Ω
      g14-2 (U) - Body ground Always 10 kΩ or higher
      g14-3 (V) - g16-3 (V) Always Below 1 Ω
      g14-3 (V) - Body ground Always 10 kΩ or higher
      g15-7 (SV) - g17-6 (SV) Always Below 1 Ω
      g15-7 (SV) - Body ground Always 10 kΩ or higher
      g15-8 (HA) - g17-7 (HA) Always Below 1 Ω
      g15-8 (HA) - Body ground Always 10 kΩ or higher
      g15-9 (HB) - g17-8 (HB) Always Below 1 Ω
      g15-9 (HB) - Body ground Always 10 kΩ or higher
      g15-1 (HC) - g17-1 (HC) Always Below 1 Ω
      g15-1 (HC) - Body ground Always 10 kΩ or higher
      g15-12 (SG) - g17-10 (SG) Always Below 1 Ω
      g15-12 (SG) - Body ground Always 10 kΩ or higher
      g15-2 (SR) - g17-2 (SR) Always Below 1 Ω
      g15-2 (SR) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INTERCHANGE FRONT AND REAR ACTIVE STABILIZER CONTROL ECU


    1. Turn the power switch off.

    2. Interchange the front active stabilizer control ECU with the rear active stabilizer control ECU, and install them securely Click here.


    NEXT

  4. CLEAR DTC


    1. Turn the power switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (IG) and the intelligent tester on.

    4. Clear the DTC Click here.


    NEXT

  5. CHECK OPERATION OF FRONT ACTIVE STABILIZER CONTROL ECU


    1. Turn the power switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (READY) and wait 30 seconds or more. Then check for rear active stabilizer DTCs Click here.

      OK
      DTC C1912 is not output

      Tech Tips

      Interchange the front and rear active stabilizer control ECUs and check for DTCs. After interchanging the ECUs, if a rear active stabilizer DTC is stored, it can be determined that the front active stabilizer control ECU is malfunctioning. If no DTC is stored, the front active stabilizer control actuator assembly is malfunctioning.


    NG

    REPLACE ACTIVE STABILIZER CONTROL ECU ASSEMBLY Click here

    OK

    REPLACE FRONT ACTIVE STABILIZER CONTROL ACTUATOR ASSEMBLY Click here