Dtc C1784/84 Steering Sensor Signal Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

CHECK DTC (VEHICLE STABILITY CONTROL SYSTEM)

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

READ VALUE USING INTELLIGENT TESTER (STEERING ANGLE)

DTC 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 detected by the diagnosis function.

DTC Code
DTC Detection Condition
Trouble Area
C1784/84
A steering angle sensor signal malfunction is detected, or a steering angle sensor power source malfunction signal is detected for 5 seconds or more.
  1. Steering angle sensor (spiral cable sub-assembly)
  2. Steering angle sensor power source circuit
  3. Suspension control ECU

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1784/84 Steering Sensor Signal Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the suspension control ECU, perform registration (LandCruiser RM000003X4500TX.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  3. Do not remove the steering angle sensor from the spiral cable sub-assembly.
  4. When replacing the spiral cable sub-assembly, confirm that the replacement part is of the correct specification.
HINT:
If DTC C1782/82 is output at the same time as C1784/84, perform troubleshooting for C1782/82 first (LandCruiser RM000001N9301JX.html).
1.CHECK DTC

  1. Clear the DTCs (LandCruiser RM000001G7P02NX.html).

  1. Perform a road test.

  1. Check if DTCs C1784/84 and U0126/71 are output (LandCruiser RM000001G7P02NX.html).

    Result
    Condition
    		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 (LandCruiser RM000001N9E018X.html)
A


2.CHECK DTC (VEHICLE STABILITY CONTROL SYSTEM)

  1. Check for steering angle sensor malfunction DTCs (LandCruiser RM0000046KV016X.html).

    Result
    Condition
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B


B
GO TO VEHICLE STABILITY CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) (LandCruiser RM0000045Z601DX.html)
A


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

  1. Disconnect the G33 steering angle sensor connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1784/84 Steering Sensor Signal Malfunction

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G33-5 (IG) - Body ground
    		Ignition switch ON
    		11 to 14 V
    G33-6 (BAT) - Body ground
    		Always
    		11 to 14 V
    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G33-2 (ESS) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Steering Angle Sensor)

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

    OK:
    No deformation or corrosion.
    HINT:
    If the steering angle sensor connector is defective, replace the spiral cable sub-assembly.


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.READ VALUE USING INTELLIGENT TESTER (STEERING ANGLE)

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

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

    Air Suspension
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Steering Angle
    		Steering angle/
    Min.: -49152.0 deg
    Max.: 49150.5 deg
    		Actual steering angle
    Turned left: reading increases
    Turned right: reading decreases
    		-
    OK:
    Steering wheel turning angle value changes when steering wheel is turned.


NG
REPLACE SPIRAL CABLE SUB-ASSEMBLY (LandCruiser RM000000SS909QX.html)
OK

REPLACE SUSPENSION CONTROL ECU (LandCruiser RM000002BGR01UX.html)