Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001QOLS
Model Year Start: 2021 Model: RAV4 Prod Date Range: [08/2020 -           ]
Title: A25A-FKS (ENGINE CONTROL): SFI SYSTEM: U012987; Lost Communication with Brake System Control Module Missing Message; 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]

DTC

U012987

Lost Communication with Brake System Control Module Missing Message

MONITOR DESCRIPTION

The ECM and skid control ECU (brake booster with master cylinder assembly) send and receive signals via CAN communication.

If a communication error occurs between the ECM and skid control ECU (brake booster with master cylinder assembly), the ECM stores this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

U012987

Lost Communication with Brake System Control Module Missing Message

All of the following conditions are met for 4.98 seconds or more (1 trip detection logic):

  • Ignition switch to ON
  • Battery voltage is 10 V or higher
  • No communication between ECM and skid control ECU (brake booster with master cylinder assembly)
  • CAN communication system
  • Skid control ECU (brake booster with master cylinder assembly)
  • ECM

Does not come on

DTC stored
  • SAE Code: U0129
  • DTC for Mexico Models: Applies

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Turn the ignition switch to ON.
  7. Turn the Techstream on.
  8. Wait 5 seconds or more.
  9. Enter the following menus: Powertrain / Engine / Trouble Codes.
  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: U012987.
  13. Check the DTC judgment result.

    Techstream 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.

CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the Techstream. 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.

GO TO CAN COMMUNICATION SYSTEM

(a) Refer to the CAN Communication System.

Click here 2019 - 2024 MY RAV4 [11/2018 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

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END