Toyota Avalon Service & Repair Manual: Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129)

Toyota Avalon Service & Repair Manual / Engine / Cruise Control / Dynamic Radar Cruise Control System(for Gasoline Model) / Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129)

DESCRIPTION

The driving support ECU assembly communicates 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

MIL

U0100

Lost Communication with ECM / PCM "A"

While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the ECM and driving support ECU assembly is detected for approximately 1 second or more.

  • CAN communication system
  • ECM
  • Driving support ECU assembly

Does not come on

U0125

Lost Communication with Yaw Rate Sensor Module

While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the yaw rate and acceleration sensor (airbag sensor assembly) and driving support ECU assembly is detected for approximately 1 second or more.

  • CAN communication system
  • Yaw rate and acceleration sensor (Airbag sensor assembly)
  • Driving support ECU assembly

Does not come on

U0126

Lost Communication with Steering Angle Sensor Module

While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the steering sensor and driving support ECU assembly is detected for approximately 1 second or more.

  • CAN communication system
  • Steering sensor
  • Driving support ECU assembly

Does not come on

U0129

Lost Communication with Brake System Control Module

While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the skid control ECU (brake actuator assembly) and driving support ECU assembly is detected for approximately 2.5 seconds or more.

  • CAN communication system
  • Skid control ECU (Brake actuator assembly)
  • Driving support ECU assembly

Does not come on

PROCEDURE

1.

CHECK FOR DTCs

(a) Clear the DTCs.

Powertrain > Radar Cruise2 > 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.

Powertrain > Radar Cruise2 > Trouble Codes

Result

Proceed to

DTC U0100, U0125, U0126 and U0129 are not output

A

DTC U0100, U0125, U0126 or U0129 is output

B

A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM

    Terminals Of Ecu

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

    See More:

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