Toyota Avalon Service & Repair Manual: Lost Communication with Vehicle Dynamics Control Module Missing Message (U012287-U110487)

Toyota Avalon Service & Repair Manual / Engine / Cruise Control / Dynamic Radar Cruise Control System(for Hv Model) / Lost Communication with Vehicle Dynamics Control Module Missing Message (U012287-U110487)

DESCRIPTION

The Hybrid vehicle control ECU 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

U012287

Lost Communication with Vehicle Dynamics Control Module Missing Message

When the power switch is on (IG) and the dynamic radar cruise control system is operating, a communication error between the skid control ECU (brake booster with master cylinder assembly) and Hybrid vehicle control ECU is detected for approximately 2.6 seconds or more.

  • CAN communication system
  • Hybrid vehicle control ECU
  • skid control ECU (brake booster with master cylinder assembly)

Does not come on

U029387

Lost Communication With Hybrid Powertrain Control Module Missing Message

While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, the hybrid vehicle control ECU continuously receives a communication cut-off signal from the skid control ECU (brake booster with master cylinder assembly) for approximately 1 second or more.

  • CAN communication system
  • Hybrid vehicle control ECU
  • Skid control ECU (brake booster with master cylinder assembly)

Does not come on

U110487

Lost Communication with Driving Support ECU Missing Message

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 driving support ECU assembly and Hybrid vehicle control ECU is detected for 1 second or more.

  • CAN communication system
  • Hybrid vehicle control ECU
  • Driving support ECU assembly

Does not come on

PROCEDURE

1.

CHECK FOR DTCs

(a) Clear the DTCs.

Powertrain > Radar Cruise1 > 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 Cruise1 > Trouble Codes

Result

Proceed to

DTC U012287, U029387 and U110487 are not output

A

DTC U012287, U029387 or U110487 is output

B

A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM

    Lost Communication with Driving Support ECU (U1104)

    Front Camera System(for Gasoline Model)

    See More:

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