Toyota CH-R Service Manual: Steering Angle Sensor Output Malfunction (C1434)

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the steering angle sensor via CAN communication.

HINT:

If there is a malfunction in the bus lines between the steering angle sensor and the CAN communication system, DTC U0126 (Lost Communication with Steering Angle Sensor Module) is output. When U0126 is output together with C1434, inspect and repair the trouble areas indicated by U0126 first.

DTCs may be stored if one of the following occurs:

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1434	Steering Angle Sensor Output Malfunction	Any of the following is detected: The difference between zero point stored in the steering angle sensor and the estimated zero point exceeds 15 deg. The offset value of the steering angle sensor is -13.5 deg. or less or 13.5 deg. or more. The steering angle sensor value exceeds a specified value for 0.3 seconds or more. The change of the steering angle sensor value within 0.02 seconds is abnormal. The steering angle sensor value changes by less than 5 deg. and both left and right turns have been recognized. There is a difference between the skid control ECU (brake actuator assembly) estimated value and the steering angle sensor value due to an abnormal steering angle sensor value.	Sensor installation Steering angle sensor power supply Steering angle sensor Skid control ECU (brake actuator assembly)

DTC Detection Conditions: C1434

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnosis Condition	-	-	-	-
Malfunction Status	The difference between zero point stored in the steering angle sensor and the estimated zero point exceeds 15 deg.	○	-	-
	The offset value of the steering angle sensor is -13.5 deg. or less or 13.5 deg. or more.	-	○	-
	The steering angle sensor value exceeds a specified value.	-	-	○
Detection Time		-	-	0.3 seconds or more
Number of Trips		1 trip	1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: C1434

		Vehicle Condition
		Pattern 4	Pattern 5	Pattern 6
Diagnosis Condition	-	-	-	-
Malfunction Status	The change of the steering angle sensor value within 0.02 seconds is abnormal.	○	-	-
	The steering angle sensor value changes by less than 5 deg. and both left and right turns have been recognized.	-	○	-
	There is a difference between the skid control ECU (brake actuator assembly) estimated value and the steering angle sensor value due to an abnormal steering angle sensor value.	-	-	○
Detection Time		-	-	-
Number of Trips		1 trip	1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC/EPB > Clear DTCs

(b) Turn the ignition switch off.

(c) Turn the ignition switch to ON again and check that no CAN communication system DTCs are output.

Click here

(d) Start the engine.

(e) Drive the vehicle at a speed of 50 km/h (31 mph) and turn the steering wheel to the right and left and then check that no speed sensor or yaw rate and acceleration sensor (airbag sensor assembly) DTCs are output.

Click here

Chassis > ABS/VSC/TRAC/EPB > Trouble Codes

Result	Proceed to
No CAN communication system, speed sensor, or yaw rate and acceleration sensor (airbag sensor assembly) DTCs are output.	A
CAN communication system DTCs are output.	B
Speed sensor and/or yaw rate and acceleration sensor (airbag sensor assembly) DTCs are output.	C

B

INSPECT CAN COMMUNICATION SYSTEM

C

REPAIR CIRCUIT INDICATED BY OUTPUT DTC

A

2.	CHECK STEERING ANGLE SENSOR INSTALLATION

(a) Turn the ignition switch off.

(b) Check that the steering angle sensor has been installed properly.

Click here

OK:

The steering angle sensor installation is normal.

NG

INSTALL STEERING ANGLE SENSOR CORRECTLY

OK

3.	CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

(a) Remove the steering wheel and column cover.

*a Front view of wire harness connector (to Steering Angle Sensor)

(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

(c) Disconnect the F69 steering angle sensor connector.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
F69-5 (BAT) - Body ground	Always	11 to 14 V
F69-4 (IG1) - Body ground	Ignition switch ON	11 to 14 V

Result	Proceed to
OK	A
NG	B

B

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

A

4.	CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)

(a) Turn the ignition switch off.

*a Front view of wire harness connector (to Steering Angle Sensor)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E69-1 (ESS) - Body ground	Always	Below 1 Ω

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.

Click here

OK

REPLACE STEERING ANGLE SENSOR

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)