Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001R2KI
Model Year Start: 2021 Model: Avalon Prod Date Range: [08/2020 -           ]
Title: A25A-FKS (ENGINE CONTROL): SFI SYSTEM: U011487; Lost Communication with Four-Wheel Drive Clutch Control Module Missing Message; 2021 - 2022 MY Avalon [08/2020 -        ]

DTC

U011487

Lost Communication with Four-Wheel Drive Clutch Control Module Missing Message

MONITOR DESCRIPTION

The ECM and 4WD ECU assembly send and receive signals via CAN communication.

If a communication error occurs between the ECM and 4WD ECU assembly, the ECM stores this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

U011487

Lost Communication with Four-Wheel Drive Clutch Control Module Missing Message

All of the following conditions are met for 3 seconds or more (1 trip detection logic):

  • Engine switch on (IG)
  • Battery voltage is 10 V or higher
  • No communication between ECM and 4WD ECU assembly
  • CAN communication system
  • 4WD ECU assembly
  • ECM

Does not come on

DTC stored

SAE Code: U0114

MONITOR STRATEGY

Frequency of Operation

Continuous

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 2019 - 2022 MY Avalon [04/2018 -        ]; 2GR-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

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

    Click here 2019 - 2022 MY Avalon [04/2018 -        ]; 2GR-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  1. Connect the GTS to the DLC3.
  2. Turn the engine switch on (IG).
  3. Turn the GTS on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the engine switch off and wait for at least 30 seconds.
  6. Turn the engine switch on (IG) [A].
  7. Turn the GTS on.
  8. Wait 5 seconds or more.
  9. Enter the following menus: Powertrain / Engine / Trouble Codes [B].
  10. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  12. Input the DTC: U011487.
  13. Check the DTC judgment result.

    GTS Display

    Description

    NORMAL
    • DTC judgment completed
    • System normal

    ABNORMAL
    • DTC judgment completed
    • System abnormal

    INCOMPLETE
    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system is malfunctioning.
    • [A] to [B]: Normal judgment procedure.

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

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CAUTION / NOTICE / HINT

HINT:

Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC U011487)

(a) Perform the Health Check using the GTS.

(b) Read the DTCs.

Result

Proceed to

DTC U011487 is output

A

DTC U011487 and other DTCs are output

B

HINT:

If any DTCs other than U011487 are output, troubleshoot those DTCs first.

A

GO TO CAN COMMUNICATION SYSTEM

B

GO TO DTC CHART