Toyota CH-R Service Manual: Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129,U023A)

Toyota CH-R Service Manual / Pre-collision / Pre-collision System / Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129,U023A)

DESCRIPTION

These DTCs are stored when a communication malfunction occurs between ECUs that perform pre-collision control.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U0100

Lost Communication with ECM / PCM "A"

When driving the vehicle at a speed of 5 km/h (4 mph) or more, a communication error between the ECM and the millimeter wave radar sensor assembly is detected for approximately 5 seconds.

  • CAN communication system
  • ECM
  • Millimeter wave radar sensor assembly
  • Wire harness or connector

U0125

Lost Communication with Yaw Rate Sensor Module

When driving the vehicle at a speed of 5 km/h (4 mph) or more, a communication error between the yaw rate and acceleration sensor (airbag sensor assembly) and the millimeter wave radar sensor assembly is detected for approximately 1 second.

  • CAN communication system
  • Yaw rate and acceleration sensor (Airbag sensor assembly)
  • Millimeter wave radar sensor assembly
  • Wire harness or connector

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 the millimeter wave radar sensor assembly is detected for approximately 4 seconds.

  • CAN communication system
  • Steering angle sensor (Spiral cable with sensor sub-assembly)
  • Millimeter wave radar sensor assembly
  • Wire harness or connector

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 the millimeter wave radar sensor assembly is detected for approximately 3 seconds.

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

U023A

Lost Communication with Front Camera Module

After the ignition switch is turned ON, a communication malfunction occurs between the millimeter wave radar sensor assembly and forward recognition camera.

  • CAN communication system
  • Forward recognition camera
  • Millimeter wave radar sensor assembly
  • Wire harness or connector

PROCEDURE

1.

CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

Click here

Body Electrical > Pre-Collision 2 > Clear DTCs

(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

Body Electrical > Pre-Collision 2 > Trouble Codes

Result

Proceed to

DTC U0100, U0125, U126 and U0129 are not output

A

DTC U0100, U0125, U126 or U0129 is output

B

A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM

    Lost Communication with Gateway Module (U1002)
    DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area U1002 Lost Communication with Gateway Module ...

    Front Camera Module Incorrect Axial Gap (C1AA8,C1AA9)
    DESCRIPTION If the millimeter wave radar sensor assembly detects that the forward recognition camera beam has an axis misalignment, DTC C1AA8 is output. Also if forward recognition axis adjustment ...

    Other materials:

    Toyota CH-R Service Manual > Vehicle Stability Control System: Acceleration Sensor Internal Circuit (C1419,C1435)
    DESCRIPTION These DTCs are stored when the skid control ECU (brake actuator assembly) receives an internal malfunction signal from the yaw rate and acceleration sensor (airbag sensor assembly). DTC No. Detection Item DTC Detection Condition Trouble A ...

    Toyota CH-R Service Manual > Tire Pressure Warning System: Transmitter ID not Received in Main Mode (C2126/26)
    DESCRIPTION After all IDs are registered, DTC C2126/26 is stored in the tire pressure warning ECU and receiver and the tire pressure warning light blinks for 1 minute and then illuminates. When the tire pressure warning ECU and receiver successfully receives radio waves from all the transmit ...

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