Lost Communication with Steering Angle Sensor Module - Variable Gear Ratio Steering System

STEERING COLUMN: VARIABLE GEAR RATIO STEERING SYSTEM: C1595/55,C15C4/68: Lost Communication with Steering Angle Sensor Module
C15C4/68 - Steering Angle Signal (Test Mode DTC)

DESCRIPTION

Signal transmission between the steering control ECU and steering angle sensor is performed via serial communication.

If an error occurs between them in serial communication, the ECU will store DTC C1595/55.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC (CAN COMMUNICATION SYSTEM)

(a) Check for DTCs in the CAN communication system Diagnosis System.

Result





B -- GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)
A -- Continue to next step.

2. CHECK STEERING ANGLE SENSOR

(a) Check that a steering angle sensor with the specified part number is installed.

Standard:

A steering angle sensor with the specified part number (89245-30070) is installed.

NG -- REPLACE STEERING ANGLE SENSOR
OK -- Continue to next step.

3. CHECK WIRE HARNESS

(a) Turn the engine switch off.





(b) Disconnect the connectors from the steering control ECU and the steering angle sensor.

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

Resistance:





NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.

4. CHECK STEERING ANGLE SENSOR

(a) Connect the connector to the steering angle sensor.





(b) Adjust the shift lever to neutral.

(c) Jack up the vehicle.

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

(e) Check the signal waveform according to the condition in the table below.

Voltage:





HINT
The output voltage should fluctuate up and down similarly to the diagram on the left when the wheel is turned slowly.

NG -- REPLACE STEERING ANGLE SENSOR

OK -- REPLACE STEERING CONTROL ECU