Air Suspension System

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1777/77: Steering Angle Sensor Circuit

DTC C1777/77 - Steering Angle Sensor Circuit

DESCRIPTION

The steering sensor is mounted on the combination switch assembly and detects the steering wheel angle and its direction.






WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: Start the inspection from step 1 when using the Techstream, and start from step 2 when not using the Techstream.

PROCEDURE

1. READ VALUE USING DATA LIST
(a) Connect the Techstream to DLC3.
(b) Turn the ignition switch ON, and the Techstream on.
(c) Select the item "Steering Angle" in the Data List, and read its value displayed on the Techstream.
(d) Check that the steering wheel turning angle value of the steering angle position sensor displayed on the Techstream changes when turning the steering wheel.
Standard:
Steering wheel turning angle value changes.
OK -- CHECK AND REPLACE SUSPENSION CONTROL ECU
NG -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (STEERING SENSOR)





(a) Disconnect the steering sensor connector.
(b) Turn the ignition switch to ON, and measure voltage between terminals 1 (IG1) and 2 (ESS) and between terminals 2 (ESS) and 9 (BAT) of the steering sensor harness side connector.
Standard voltage:
10 to 14 V
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT STEERING SENSOR





(a) Disconnect the steering angle sensor connector.
(b) Apply battery positive voltage between terminals 1 (IG1) and 2 (ESS) and between terminals 2 (ESS) and 9 (BAT).
(c) Connect the oscilloscope to the terminals 4 (SS2+) and 12 (SS2-) of the steering angle sensor.
(d) Turn the steering column shaft slowly and check the signal waveform.





HINT: Above signal waveform does not repeat ON and OFF regularly and this ON-OFF interval changes depending on the data.

NG -- REPLACE STEERING SENSOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (STEERING SENSOR - SUSPENSION CONTROL ECU)
(a) Check for open and short circuit in the harness and the connector between the steering sensor and the suspension control ECU Electronic Circuit Inspection Procedure.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- CHECK AND REPLACE SUSPENSION CONTROL ECU