Toyota Tacoma (2015-2018) Service Manual: Lost Communication with Yaw Rate Sensor Module (U0123,U0126,U0129,U0142,U0155)

Toyota Tacoma (2015-2018) Service Manual / Cruise Control / Lane Departure Alert System / Lost Communication with Yaw Rate Sensor Module (U0123,U0126,U0129,U0142,U0155)

DESCRIPTION

These DTCs are output when a communication malfunction occurs between the sensors and ECUs.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
U0123	Lost Communication with Yaw Rate Sensor Module	3 seconds after the ignition switch is turned to ON, the vehicle is being driven at 5 km/h (3 mph) or more and a communication error between the yaw rate sensor and the forward recognition camera is detected for approximately 5 seconds or more.	CAN communication system Yaw rate and acceleration sensor (airbag sensor assembly) Forward recognition camera
U0126	Lost Communication With Steering Angle Sensor Module	3 seconds after the ignition switch is turned to ON, a communication error between the spiral cable with sensor sub-assembly and the forward recognition camera is detected for approximately 5 seconds or more.	CAN communication system Spiral cable with sensor sub-assembly Forward recognition camera
U0129	Lost Communication with Brake System Control Module	3 seconds after the ignition switch is turned to ON, a communication error between the skid control ECU (brake actuator assembly) and the forward recognition camera is detected for approximately 5 seconds or more.	CAN communication system Skid control ECU (brake actuator assembly)1 Skid control ECU (master cylinder solenoid)2 Forward recognition camera
U0142	Lost Communication with Body Control Module "B"	3 seconds after the ignition switch is turned to ON, a communication error between the main body ECU (multiplex network body ECU) and the forward recognition camera is detected for approximately 5 seconds or more.	CAN communication system Main body ECU (Multiplex network body ECU) Forward recognition camera
U0155	Lost Communication with Combination Meter	3 seconds after the ignition switch is turned to ON, a communication error between the combination meter assembly and the forward recognition camera is detected for approximately 50 seconds or more.	CAN communication system Combination meter assembly Forward recognition camera

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

PROCEDURE

1.	CHECK FOR DTCs

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

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

(h) Check the DTCs.

Click here

Result	Proceed to
DTC U0123, U0126, U0129, U0142 and U0155 are not output	A
DTC U0123, U0126, U0129, U0142 or U0155 is output	B

USE SIMULATION METHOD TO CHECK

GO TO CAN COMMUNICATION SYSTEM

Front Camera Module Circuit (C1AA0)

DESCRIPTION When an internal malfunction is detected in the forward recognition camera, DTC C1AA0 is stored. DTC No. Detection Item DTC Detection Condition ...

Vehicle Speed Sensor Circuit (C1AA3)

DESCRIPTION The forward recognition camera receives vehicle speed signals from the skid control ECU. If the skid control ECU receives a vehicle speed sensor malfunction signal, it informs the for ...

Other materials:

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION (a) To check DTCs, connect the Techstream to the Data Link Connector 3 (DLC3) of the vehicle. The Techstream displays DTCs and freeze frame data. The DTCs and freeze frame data can be cleared with the Techstream (See page ). 2. NORMAL MODE AND CHECK MODE (a) ...

Theft Deterrent System is not Unset when Engine is Running
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Precaution
PRECAUTION 1. IGNITION SWITCH EXPRESSION HINT: The type of ignition switch used on this model differs depending on the specifications of the vehicle. The expressions listed in the table below are used in this section. Expression Ignition Switch (Position) Engin ...