Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Lost Communication with ECM / PCM "A" (U0100,U0104,U0122,U0125,U0126,U0129)

Toyota Tacoma 2015-2018 Service Manual / Cruise Control / Dynamic Radar Cruise Control System(for 2tr-fe) / Lost Communication with ECM / PCM "A" (U0100,U0104,U0122,U0125,U0126,U0129)

DESCRIPTION

The millimeter wave radar sensor assembly and ECM communicate with each sensor and ECU via CAN communication.

If any malfunction is detected in a CAN communication circuit, one or more CAN communication system DTCs are stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U0100

Lost Communication with ECM / PCM "A"

Condition 1:
  • While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the ECM and the millimeter wave radar sensor assembly is detected for approximately 1 second or more.
Condition 2:
  • While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, the ECM continuously receives a communication cut-off signal from the skid control ECU (brake actuator assembly) for approximately 1 second or more.
Condition 1:
  • CAN communication system
  • ECM
  • Millimeter wave radar sensor assembly
Condition 2:
  • CAN communication system
  • ECM
  • Skid control ECU (brake actuator assembly)

U0104

Lost Communication with Cruise Control Module

While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the ECM and the millimeter wave radar sensor assembly is detected for approximately 1 second or more.

  • CAN communication system
  • ECM
  • Millimeter wave radar sensor assembly

U0122

Lost Communication with Vehicle Dynamics Control Module

When the ignition switch is ON and the dynamic radar cruise control system is operating, a communication error between the skid control ECU (brake actuator assembly) and the ECM is detected for approximately 2.6 seconds or more.

  • CAN communication system
  • ECM
  • Skid control ECU (brake actuator assembly)

U0125

Lost Communication with Yaw Rate Sensor Module

While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the yaw rate sensor and the millimeter wave radar sensor assembly is detected for approximately 1 second or more.

  • CAN communication system
  • Yaw rate sensor (airbag sensor assembly)
  • Millimeter wave radar sensor assembly

U0126

Lost Communication with Steering Angle Sensor Module

While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the steering sensor and the millimeter wave radar sensor assembly is detected for approximately 1 second or more.

  • CAN communication system
  • Steering sensor
  • Millimeter wave radar sensor assembly

U0129

Lost Communication with Brake System Control Module

While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the skid control ECU (brake actuator assembly) and the millimeter wave radar sensor assembly is detected for approximately 2.5 seconds or more.

  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • Millimeter wave radar sensor assembly

PROCEDURE

1.

CHECK FOR DTCs (RADAR CRUISE 1 AND RADAR CRUISE 2)

(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.

  1. Turn the ignition switch to ON.
  2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).
  3. Drive the vehicle at 36 km/h (22 mph) or more for 5 seconds or more.

(c) Check for DTCs.

Click here

Result

Proceed to

DTC U0100, U0104, U0122, U0125, U0126, U0129 and U0137 are not output

A

DTC U0100, U0104, U0122, U0125, U0126, U0129 or U0137 is output

B

A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM

Fail-safe Chart
FAIL-SAFE CHART HINT: If any of the following auto cancel conditions are detected while the dynamic radar cruise control system is controlling vehicle speed, the system clears the stored vehicle ...

Vehicle Control History
VEHICLE CONTROL HISTORY VEHICLE CONTROL HISTORY HINT: A part of the control history can be confirmed using the vehicle control history. Click here ...

Other materials:

Short in Side Squib LH Circuit (B1825/56-B1828/56)
DESCRIPTION The side squib LH circuit consists of the airbag sensor assembly and the front seat airbag assembly LH. This circuit signals the SRS to deploy when airbag deployment conditions are met. These DTCs are set when a malfunction is detected in the side squib LH circuit. DTC ...

Transmission Fluid Temperature Sensor "A" Circuit Low Input (P0712,P0713)
DESCRIPTION The No. 1 ATF temperature sensor converts the fluid temperature into a resistance value for use by the ECM. The ECM applies a voltage to the temperature sensor through terminal THO1 of the ECM. The sensor resistance changes with the ATF temperature. As the temperature becomes hi ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST HINT: Using the Techstream to read the Data List allows values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may ...

В© 2011-2022 Copyright www.ttguide.net