- DTC judgment completed
- System normal
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001GJ7R |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 04/2020] |
| Title: 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: U129387; Lost Communication between Hybrid Powertrain Control Module and Active Grille Air Shutter Missing Message; 2020 MY Corolla Corolla HV [01/2019 - 04/2020] | ||
|
DTC |
U129387 |
Lost Communication between Hybrid Powertrain Control Module and Active Grille Air Shutter Missing Message |
DESCRIPTION
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 |
All of the following conditions are met and the ECM receives a malfunction signal 17 times* (1 trip detection logic):
|
|
Comes on / Does not come on |
DTC stored |
|
HINT:
*: 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.
MONITOR STRATEGY
|
Related DTCs |
U1293: Lost communication with hybrid control module |
|
Required Sensors/Components (Main) |
Swing grille actuator assembly |
|
Required Sensors/Components (Related) |
- |
|
Frequency of Operation |
Continuous |
|
Duration |
17 times |
|
MIL Operation |
Immediate |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever the following DTCs are not stored |
None |
|
Both of the following conditions are met |
- |
|
Auxiliary battery Voltage |
9.5 V or higher |
|
Power switch |
On (IG) |
TYPICAL MALFUNCTION THRESHOLDS
|
Communication signal |
Lost communication with hybrid control module |
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
![2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG).
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for at least 30 seconds.
- Turn the power switch on (IG) [A].
- Turn the Techstream on.
- Wait 20 seconds or more.
- Enter the following menus: Powertrain / Engine / Trouble Codes [B].
-
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.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: U129387.
-
Check the DTC judgment result.
Techstream Display
Description
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 auxiliary 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 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
| NEXT |
|
END |
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