C1784

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1784/84: Steering Sensor Signal Malfunction
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.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- When replacing the suspension control ECU, perform registration Programming and Relearning.
- 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.

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

PROCEDURE

1. CHECK DTC

(a) Clear the DTCs Air Suspension System.

(b) Perform a road test.

(c) Check if DTCs C1784/84 and U0126/71 are output Air Suspension System.

Result





B -- GO TO DTC U0126/71 Air Suspension System
A -- Continue to next step.

2. CHECK DTC (VEHICLE STABILITY CONTROL SYSTEM)

(a) Check for steering angle sensor malfunction DTCs Reading and Clearing Diagnostic Trouble Codes.

Result





B -- GO TO VEHICLE STABILITY CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Vehicle Stability Control System
A -- Continue to next step.

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

(a) Disconnect the G21 steering angle sensor connector.

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





Standard Voltage:





Standard Resistance:





Text in Illustration





(c) 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 -- Continue to next step.

4. READ VALUE USING TECHSTREAM (STEERING ANGLE)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Air suspension / Data List.

Air Suspension





OK:

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

NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY Removal

OK -- REPLACE SUSPENSION CONTROL ECU Removal