Toyota Tacoma (2015-2018) Service Manual: Yaw Rate Sensor Circuit (C1AA4,C1AA5)

Toyota Tacoma (2015-2018) Service Manual / Cruise Control / Lane Departure Alert System / Yaw Rate Sensor Circuit (C1AA4,C1AA5)

DESCRIPTION

The forward recognition camera receives vehicle stability signals from the yaw rate and acceleration sensor (airbag sensor assembly). If the yaw rate and acceleration sensor (airbag sensor assembly) detects an abnormal yaw rate sensor signal or yaw rate sensor assembly power supply voltage, it informs the forward recognition camera via CAN communication, and DTC C1AA4 or C1AA5 is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1AA4	Yaw Rate Sensor Circuit	3 seconds after the ignition switch is turned to ON, the vehicle speed is 5 km/h (3 mph) or more and a signal from the yaw rate sensor indicating a malfunction in the yaw rate sensor is detected by the forward recognition camera for 5 seconds or more.	Vehicle stability control system Yaw rate and acceleration sensor (airbag sensor assembly) Forward recognition camera
C1AA5	Yaw Rate Sensor Power Supply Voltage Circuit	3 seconds after the ignition switch is turned to ON, the vehicle speed is 5 km/h (3 mph) or more and a signal from the yaw rate sensor indicating an abnormal yaw rate sensor power supply voltage signal is detected by the forward recognition camera for 5 seconds or more.	Vehicle stability control system Yaw rate and acceleration sensor (airbag sensor assembly) Forward recognition camera

CAUTION / NOTICE / HINT

NOTICE:

When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera learning.
Click here
First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.
Click here

PROCEDURE

1.	CHECK DTC OUTPUT (VEHICLE STABILITY CONTROL SYSTEM)

HINT:

If the yaw rate and acceleration sensor (airbag sensor assembly) is malfunctioning, DTCs for the vehicle stability control system will be stored. Troubleshoot the vehicle stability control system first.

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Check for DTCs.

for Vacuum Brake Booster
Click here
for Hydraulic Brake Booster
Click here

Result	Proceed to
Vehicle stability control system DTCs are not output	A
Vehicle stability control system DTCs are output (for Vacuum Brake Booster)	B
Vehicle stability control system DTCs are output (for Hydraulic Brake Booster)	C

GO TO VEHICLE STABILITY CONTROL SYSTEM

2.	CHECK DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Chassis / LKA/LDA / Trouble Codes.

(e) Clear the DTCs.

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

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

HINT:

If the following procedure is not performed, the previously output DTC cannot be detected.

(g) Check for DTCs.

Click here

Result	Proceed to
DTC C1AA4 or C1AA5 is output.	A
DTC C1AA4 and C1AA5 are not output.	B

USE SIMULATION METHOD TO CHECK

3.	REPLACE FORWARD RECOGNITION CAMERA

(a) Replace the forward recognition camera.

Click here (b) Adjust the forward recognition camera.

(b) Adjust the forward recognition camera.

Click here

4.	CHECK DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Chassis / LKA/LDA / Trouble Codes.

(e) Clear the DTCs.

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

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

HINT:

If the following procedure is not performed, the previously output DTC cannot be detected.

(g) Check for DTCs.

Click here

Result	Proceed to
DTC C1AA4 or C1AA5 is output.	A
DTC C1AA4 and C1AA5 are not output.	B

REPLACE YAW RATE AND ACCELERATION SENSOR (AIRBAG SENSOR ASSEMBLY)

END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

Steering Angle Sensor (C1A47)

DESCRIPTION The forward recognition camera receives steering angle information from the spiral cable with sensor sub-assembly. If the forward recognition camera detects a spiral cable with sensor ...

Vehicle Control History

VEHICLE CONTROL HISTORY VEHICLE CONTROL HISTORY (a) A part of the control history can be confirmed using the vehicle control history. Click here ...

Other materials:

FCM Destination Information Uninitialized (C1AAA)
DESCRIPTION When the forward recognition camera is replaced with a new one, the new forward recognition camera attempts to store the country specification information received from the main body ECU (multiplex network body ECU). If the forward recognition camera cannot store the country speci ...

Inverter Relay
On-vehicle Inspection ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT INVERTER RELAY (a) Check the resistance. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition ...

Components
COMPONENTS ILLUSTRATION *1 INSTRUMENT LOWER PANEL ASSEMBLY *2 INSTRUMENT PANEL LOWER CENTER FINISH PANEL *3 NO. 2 INSTRUMENT PANEL GARNISH SUB-ASSEMBLY *4 REAR NO. 2 POWER WINDOW REGULATOR SWITCH ASSEMB ...