Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Lost Communication With ECM/PCM "A" Missing Message (U010087,U029387,U117087)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / Hybrid / Battery Control / Motor Generator Control System / Lost Communication With ECM/PCM "A" Missing Message (U010087,U029387,U117087)

DESCRIPTION

The motor generator control ECU communicates with the hybrid vehicle control ECU, ECM and skid control ECU assembly via CAN communication.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

U010087

Lost Communication With ECM/PCM "A" Missing Message

A CAN communication error between the ECM and motor generator control ECU (CAN communication system malfunction) occurs

(1 trip detection logic)

CAN communication system

Comes on

Master Warning Light:

Comes on

U029387

Lost Communication With Hybrid Powertrain Control Module Missing Message

A CAN communication error between the hybrid vehicle control ECU and motor generator control ECU (CAN communication system malfunction) occurs

(1 trip detection logic)

CAN communication system

Comes on

Master Warning Light:

Comes on

U117087

Lost Communication With Brake System Control Module(ch2) Missing Message

A CAN communication error between the skid control ECU assembly and motor generator control ECU (CAN communication system malfunction) occurs

(1 trip detection logic)

CAN communication system

Comes on

Master Warning Light:

Comes on

MONITOR DESCRIPTION

If the motor generator control ECU detect problem with CAN communication with each ECU, it will illuminate the MIL and set a DTC.

MONITOR STRATEGY

Related DTCs

U0100 (INF U010087): Lost Communication With ECM/PCM

U0293 (INF U029387): Lost Communication With Hybrid Control Module

U1170 (INF U117087): Lost Communication With Brake System Control Module

Required sensors/components

Motor generator control ECU

Frequency of operation

Continuous

Duration

TMC's intellectual property

MIL operation

Immediately

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored

TMC's intellectual property

Other conditions belong to TMC's intellectual property

-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

-

COMPONENT OPERATING RANGE

Motor generator control ECU

DTC U0100 (INF U010087) is not detected

DTC U0293 (INF U029387) is not detected

DTC U1170 (INF U117087) is not detected

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. With power switch on (IG) and wait for 2 minutes or more. [*1]

    HINT:

    [*1]: Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  7. Enter the following menus: Powertrain / Motor Generator / Utility / All Readiness.
  8. Check the DTC judgment result.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

PROCEDURE

1.

CHECK DTC OUTPUT (MOTOR GENERATOR CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Motor Generator / Trouble Codes.

(d) Check for DTCs.

Powertrain > Motor Generator > Trouble Codes

Result

Proceed to

None of the following DTCs are output.

A

Any of the following DTCs are also output.

B

Relevant DTC

P312487

Lost Communication between Drive Motor "A" and HV ECU Missing Message

HINT:

U010087, U029387 or U117087 may be stored due to a malfunction which also causes the DTCs in the preceding table to be stored. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output.

(e) Turn the power switch off.

A

GO TO CAN COMMUNICATION SYSTEM

B

GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM)

    Terminals Of Ecu

    Utility

    See More:

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