Toyota Tacoma 2015-2018 Service Manual: Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129)
DESCRIPTION
These DTCs are stored when a communication malfunction occurs between ECUs that perform pre-collision system control.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
U0100 |
Lost Communication with ECM / PCM "A" |
When the vehicle is being driven at a speed of 5 km/h (4 mph) or more, a communication error between the ECM and millimeter wave radar sensor assembly is detected for approximately 4 seconds. |
|
|
U0125 |
Lost Communication with Yaw Rate Sensor Module |
When the vehicle is being driven at a speed of 5 km/h (4 mph) or more, a communication error between the yaw rate sensor (airbag sensor assembly) and millimeter wave radar sensor assembly is detected for approximately 1 second. |
|
|
U0126 |
Lost Communication with Steering Angle Sensor Module |
When the ignition switch is ON, a communication error between the steering angle sensor (spiral cable with sensor sub-assembly) and millimeter wave radar sensor assembly is detected for approximately 1 second. |
|
|
U0129 |
Lost Communication with Brake System Control Module |
When the ignition switch is ON, a communication error between the skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 and millimeter wave radar sensor assembly is detected for approximately 6 seconds. |
|
- *1: for Hydraulic Brake Booster
- *2: for Vacuum Brake Booster
PROCEDURE
|
1. |
CHECK FOR DTCs (PRE-COLLISION SYSTEM) |
(a) Clear the DTCs.
Click here .gif)
(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 U0100, U0125, U0126 and U0129 are not output |
A |
|
DTC U0100, U0125, U0126 or U0129 is output |
B |
| A | .gif) |
USE SIMULATION METHOD TO CHECK |
| B | |
GO TO CAN COMMUNICATION SYSTEM |
Heater Circuit (C1AAE)
DESCRIPTION
If the forward recognition camera detects a malfunction in the camera heater
(forward recognition hood) circuit, it will output a malfunction signal to the millimeter
wave radar senso ...
Lost Communication with Cruise Control Front Distance Range Sensor (U0235)
DESCRIPTION
The millimeter wave radar sensor assembly is connected to the skid control ECU
(master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 via
CAN communication. If c ...
Other materials:
Operation Check
OPERATION CHECK
1. CHECK AUTO OPERATION
NOTICE:
Make sure that initialization has been completed before inspection (See
page ).
The sliding roof auto operation can be customized. Make sure that the
auto operation is ON (See page ).
HINT:
When pressing the switch for ...
Installation
INSTALLATION
PROCEDURE
1. INSTALL CENTER STOP LIGHT ASSEMBLY (for Bulb Type Stop Light)
(a) Install the 3 center stop light bulbs to the 3 center stop light sockets.
(b) Turn the 3 center stop light sockets with 3 center stop light bulbs
in the direction indicated by the arrow sho ...
Theft deterrent system
Engine immobilizer system
The vehicle’s keys have built-in transponder chips that prevent the engine from
starting if the key has not been previously registered in the vehicle’s on-board
computer.
Never leave the keys inside the vehicle when you leave the vehicle.
The indicator light fl ...
