Home › Steering › Steering Column › VARIABLE GEAR RATIO STEERING: VARIABLE GEAR RATIO STEERING SYSTEM
Last Modified: 11-27-2007 1.6 C
Service Category: Steering Section: Steering Column
Model Year: 2008 Model: LX570 Doc ID: RM000000YU200IX
Title: VARIABLE GEAR RATIO STEERING: VARIABLE GEAR RATIO STEERING SYSTEM: DESCRIPTION (2008 LX570)

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

DTC Code

DTC Detection Condition

Trouble Area

C1595/55

The steering control ECU detects an error in serial communication between the ECU and steering angle sensor.
  • Steering angle sensor
  • Steering control ECU
  • Harness or connector

C15C4/68

A steering signal indicating a tire angle of 36° or more (to the left or right) is input after entering test mode.*
  • Steering angle sensor
  • Steering control ECU
  • Harness or connector

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 E84 steering control ECU connector.

(b) Disconnect the E11 steering angle sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E84-10 (SS1-) - E11-7 (SS1-)

Always

Below 1 Ω

E84-19 (SS1+) - E11-8 (SS1+)

E84-19 (SS1+) - Body ground

Always

10 kΩ or higher

E84-10 (SS1-) - Body ground

E84-19 (SS1+) - E84-10 (SS1-)
OK

2.

CHECK STEERING ANGLE SENSOR

(a) Disconnect the E84 steering control ECU connector.

(b) Move the shift lever to N.

(c) Jack up the vehicle.

(d) Check the waveform of the steering angle sensor using an oscilloscope.

HINT:

The voltage must be measured with the steering angle sensor connector connected.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

E84-19 (SS1+) - E84-10 (SS1-)

Engine switch on (IG), steering wheel rotated slowly

Pulse generation

(0 to 5 V)

HINT:

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

OK