C1595

STEERING COLUMN: VARIABLE GEAR RATIO STEERING SYSTEM: C1595/55: Lost Communication with Steering Angle Sensor Module

DTC C1595/55 - Lost Communication with Steering Angle Sensor Module

DTC 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 the serial communication, the ECU will store DTC C1595/55.





HINT: *: A tire angle of 36° and a motor rotation angle of 36° correspond to the steering wheel angle. The amount of change in tire angle and motor rotation angle is from when the mode is changed to test mode.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (STEERING CONTROL ECU - STEERING ANGLE SENSOR)




(a) Disconnect the A41 steering control ECU connector.
(b) Disconnect the L21 steering angle sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






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

2. CHECK STEERING ANGLE SENSOR




(a) Disconnect the A41 steering control ECU connector.
HINT: The resistance must be measured after the steering angle sensor connector is connected.
(b) Adjust the shift lever to neutral.
(c) Jack up the vehicle.
(d) Turn the engine switch on (IG).
(e) Check the waveform of the steering angle sensor using an oscilloscope.
Standard voltage:





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

NG -- REPLACE STEERING ANGLE SENSOR
OK -- REPLACE STEERING CONTROL ECU