Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Yaw Rate Sensor (C1A46)

DESCRIPTION

If the millimeter wave radar sensor assembly receives a yaw rate sensor malfunction signal from the yaw rate sensor (airbag sensor assembly) or yaw rate sensor zero point malfunction signal from the skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2, DTC C1A46 will be stored.

  • *1: for Hydraulic Brake Booster
  • *2: for Vacuum Brake Booster

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1A46

Yaw Rate Sensor

  • While the vehicle is being driven at a speed of 5 km/h (4 mph) or more, the millimeter wave radar sensor assembly receives a yaw rate sensor malfunction signal from the yaw rate sensor for approximately 10 seconds.
  • While the vehicle is being driven at a speed of 5 km/h (4 mph) or more, the millimeter wave radar sensor assembly receives a yaw rate sensor zero point malfunction signal from the skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 for approximately 10 seconds.
  • Vehicle stability control system
  • Millimeter wave radar sensor assembly
  • Yaw rate sensor (Airbag sensor assembly)
  • *1: for Hydraulic Brake Booster
  • *2: for Vacuum Brake Booster

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 C1A46 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.

  • for Hydraulic Brake Booster: Click here for Vacuum Brake Booster: Click here
  • for Vacuum Brake Booster: Click here

Result

Proceed to

Vehicle stability control system DTCs are not output

A

Vehicle stability control system DTCs are output (for Hydraulic brake booster)

B

Vehicle stability control system DTCs are output (for Vacuum brake booster)

C

B

GO TO VEHICLE STABILITY CONTROL SYSTEM

C

GO TO VEHICLE STABILITY CONTROL SYSTEM

A

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.

(c) Check for DTCs.

Click here

Result

Proceed to

DTC C1A46 is not output

A

DTC C1A46 is output

B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

Front Radar Sensor Beam Axis Not Adjusted (C1A14)
DESCRIPTION After installing a new millimeter wave radar sensor assembly, if sensor beam axis adjustment has not been performed, DTC C1A14 will be stored. DTC No. Detection I ...

Vehicle Information Not Obtained (C1A02)
DESCRIPTION When a new millimeter wave radar sensor assembly is installed, it receives vehicle specification information from the main body ECU (multiplex network body ECU) and stores the informa ...

Other materials:

Removal
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Disassembly
DISASSEMBLY PROCEDURE 1. INSPECT FRONT PROPELLER SHAFT UNIVERSAL JOINT SPIDER BEARING (a) Check the spider bearings for wear and damage. (b) Check each spider bearing's axial play by turning the yoke while holding the shaft tightly. Maximum bearing axial play: 0 to 0.05 mm (0 to 0.002 i ...

Steering Angle Sensor Output Malfunction (C1434)
DESCRIPTION Steering angle sensor signals are input to the skid control ECU (brake actuator assembly) via the CAN communication system. HINT: When a malfunction occurs in the communication line to the steering angle sensor, U0126 is output. If a DTC related to the CAN communication line is ou ...

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