Toyota Tacoma 2015-2018 Service Manual: Steering Angle Sensor (C1A47)

Toyota Tacoma 2015-2018 Service Manual / Pre-collision / Pre-collision System / Steering Angle Sensor (C1A47)

DESCRIPTION

The millimeter wave radar sensor assembly receives steering angle information from the steering angle sensor (spiral cable with sensor sub-assembly). If the millimeter wave radar sensor assembly detects a steering angle sensor (spiral cable with sensor sub-assembly) malfunction, DTC C1A47 will be stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1A47	Steering Angle Sensor	While the vehicle is being driven at a speed of 50 km/h (32 mph) or more, the millimeter wave radar sensor assembly receives a steering angle sensor (spiral cable with sensor sub-assembly) malfunction signal continuously for 1 second or more.	Vehicle stability control system Millimeter wave radar sensor assembly

CAUTION / NOTICE / HINT

NOTICE:

When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle. As a result, a DTC may be stored.
If the millimeter wave radar sensor assembly has been replaced, be sure to perform millimeter wave radar sensor assembly adjustment.
Click here
The pre-collision system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.
Click here

PROCEDURE

1.	CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

HINT:

Pre-collision system DTC C1A47 may be stored due to a malfunction in the vehicle stability control system. Therefore, it is necessary to check for and troubleshoot vehicle stability control system DTCs first.

(a) Check for DTCs.

Click here

Result	Proceed to
Vehicle stability control system DTCs are not output	A
Vehicle stability control system DTCs are output	B

GO TO VEHICLE STABILITY CONTROL SYSTEM

2.	CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here (b) Make sure that the DTC detection conditions are met.

(b) Make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

Click here

Result	Proceed to
DTC C1A47 is not output	A
DTC C1A47 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

Stop Light Relay Circuit (C1A4B)

DESCRIPTION The skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 sends a stop light operation request signal to the stop light relay (stop light switc ...

Front Radar Sensor Incorrect Axial Gap (C1A11)

DESCRIPTION When the vehicle is determined to be driving in a straight line or on a gradual curve based on signals from the yaw rate sensor, etc., the millimeter wave radar sensor assembly perfor ...

Other materials:

Removal
REMOVAL PROCEDURE 1. REMOVE AUTOMATIC TRANSMISSION ASSEMBLY (for Automatic Transmission) Transmission See page AC60E AC60F 2. REMOVE MANUAL TRANSMISSION ASSEMBLY (for Manual Transmission) (See page ) ...

Driver Side Power Window Auto Up / Down Function does not Operate with Power Window Master Switch
DESCRIPTION If the manual up/down function can be performed but the auto up/down function cannot, then the fail-safe mode may be functioning. If the power window initialization (See page ) has not been performed, the auto up/down function will not operate. WIRING DIAGRAM CAUTION / NOTICE ...

Precaution
PRECAUTION 1. REMOVAL AND INSTALLATION OF TIRE PRESSURE WARNING VALVE AND TRANSMITTER (a) When installing a tire, make sure that the tire pressure warning valve and transmitter does not interfere with the tire bead in order to prevent damage to the sensor. (b) After completing the operation, ...