AIR SUSPENSION SYSTEM, Diagnostic DTC:C1784/84

DTC Code DTC Name
C1784/84 Steering Sensor Signal Malfunction

DESCRIPTION

The steering angle sensor signal is sent to the suspension control ECU through CAN communication system. When there is a communication malfunction, this DTC is stored by the diagnosis function.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

C1784/84

Steering Sensor Signal Malfunction

A steering angle sensor signal malfunction is detected, or a steering angle sensor power source malfunction signal is detected for 5 seconds or more.

  • Steering angle sensor (spiral cable sub-assembly)

  • Steering angle sensor power source circuit

  • Suspension control ECU

Not indicated

WIRING DIAGRAM

C214176E08

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.

  • Do not remove the steering angle sensor from the spiral cable sub-assembly.

  • When replacing the spiral cable sub-assembly, confirm that the replacement part is of the correct specification.

Tip:

If DTC C1782/82 is output at the same time as C1784/84, perform troubleshooting for C1782/82 first (Click here).

PROCEDURE

  1. CHECK DTC

    1. Clear the DTC.

      Click here

      Chassis > Air suspension > Clear DTCs

    2. Perform a road test.

    3. Check if DTCs C1784/84 and U0126/71 are output.

      Click here

      Chassis > Air suspension > Trouble Codes

      Result

      Result

      Proceed to

      DTC is not output or only DTC 1784/84 is output

      A

      DTCs 1784/84 and U0126/71 are output

      B
    B

    GO TO DTC U0126/71

    Click here

    A

  2. CHECK DTC (VEHICLE STABILITY CONTROL SYSTEM)

    1. Check for steering angle sensor malfunction DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Result

      Proceed to

      DTC is not output

      A

      DTC is output

      B
    B

    GO TO VEHICLE STABILITY CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART)

    Click here

    A

  3. CHECK TERMINAL VOLTAGE AND RESISTANCE (IG, BAT, ESS)

    1. Disconnect the G21 steering angle sensor connector.

    2. C207362C02

      *a

      Front view of wire harness connector

      (to Steering Angle Sensor)

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      G21-5 (IG) - Body ground

      Engine switch on (IG)

      11 to 14 V

      G21-6 (BAT) - Body ground

      Always

      11 to 14 V

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G21-2 (ESS) - Body ground

      Always

      Below 1 Ω

    3. Check that the steering angle sensor connector is not deformed or corroded.

      OK

      No deformation or corrosion.

      Tip:

      If the steering angle sensor connector is defective, replace the spiral cable sub-assembly.

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. READ VALUE USING INTELLIGENT TESTER (STEERING ANGLE)

    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

      Steering Angle

      Steering angle

      Min.: -49152.0 deg

      Max.: 49150.5 deg

      Actual steering angle

      Steering wheel turned left: reading increases

      Steering wheel turned right: reading decreases

      -

      OK

      Steering wheel turning angle value changes when steering wheel is turned.

      Result

      Result

      OK

      NG
    OK

    REPLACE SUSPENSION CONTROL ECU

    Click here

    NG

    REPLACE SPIRAL CABLE SUB-ASSEMBLY

    Click here