SFI SYSTEM, Diagnostic DTC:U129387

DTC Code DTC Name
U129387 Lost Communication between Hybrid Powertrain Control Module and Active Grille Air Shutter Missing Message

DESCRIPTION

Tech Tips

This DTC is applicable to models w/ Grille Shutter System only.

The swing grille actuator assembly and hybrid vehicle control ECU send and receive signals via CAN communication.

If a communication error occurs between the swing grille actuator assembly and hybrid vehicle control ECU, the ECM stores this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
U129387 Lost Communication between Hybrid Powertrain Control Module and Active Grille Air Shutter Missing Message

Both of the following conditions are met and the ECM receives a malfunction signal 17 times* (1 trip detection logic):


  • Power switch on (IG)

  • No communication between swing grille actuator assembly and hybrid vehicle control ECU

  • CAN communication system

  • Hybrid vehicle control ECU

  • Swing grille actuator assembly

 Does not come on DTC stored SAE Code: U1293

Tech Tips

*: For every 65 ms that the ECM receives a grille shutter system malfunction signal from the grille shutter ECU (swing grille actuator assembly) the ECM determines it has received the signal 1 time. If the ECM determines the malfunction signal has been received 17 consecutive times (the signal is received for approximately 1 second continuously), it will store a DTC.

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the power 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 power switch off and wait for at least 30 seconds.

  6. Turn the power switch on (IG).

  7. Turn the GTS on.

  8. Wait 20 seconds or more.

  9. Enter the following menus: Powertrain / Engine / Trouble Codes.

  10. Read the DTCs.

    Tech Tips

    If a DTC is output, the system is malfunctioning.

CAUTION / NOTICE / HINT

Tech Tips

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. GO TO CAN COMMUNICATION SYSTEM


    1. Refer to the CAN Communication System.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    END