Toyota Tundra Service Manual: Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129,U0137)

Toyota Tundra Service Manual / Vehicle Interior / Pre-collision / Pre-collision System / Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129,U0137)

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.

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

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.

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

U0126

Lost Communication with Steering Angle Sensor Module

When the ignition switch is ON, a communication error between the spiral with sensor cable sub-assembly and millimeter wave radar sensor assembly is detected for approximately 1 second.

  • CAN communication system
  • Spiral with sensor cable sub-assembly
  • Millimeter wave radar sensor assembly

U0129

Lost Communication with Brake System Control Module

When the ignition switch is ON, a communication error between the skid control ECU (brake actuator assembly) and millimeter wave radar sensor assembly is detected for approximately 6 seconds.

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

U0137

Lost Communication with Trailer Brake Control Module

When the ignition switch is ON, a communication error between the trailer brake control ECU (brake control with bracket relay) and millimeter wave radar sensor assembly is detected for approximately 3 seconds.

  • CAN communication system
  • Trailer brake control ECU (Brake control with bracket relay)
  • Millimeter wave radar sensor assembly

PROCEDURE

1.

CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here

(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, U0129 and U0137 are not output

A

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

B

A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM

    Lost Communication With Image Processing Module "A" (U023A)

    Lost Communication with Cruise Control Front Distance Range Sensor (U0235)

    See More:

    Toyota Tundra Service Manual > Can Communication System: Check Bus 1 Line for Short to GND
    DESCRIPTION There may be a short circuit between one of the CAN bus lines and GND when there is no resistance between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and termina ...

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