- DTC judgment completed
- System normal
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001BH1E |
| Model Year Start: 2019 | Model: Corolla Hatchback | Prod Date Range: [06/2018 - 03/2019] |
| Title: M20A-FKS (ENGINE CONTROL): SFI SYSTEM: U012987; Lost Communication with Brake System Control Module Missing Message; 2019 - 2020 MY Corolla Corolla Hatchback [06/2018 - 03/2019] | ||
|
DTC |
U012987 |
Lost Communication with Brake System Control Module Missing Message |
MONITOR DESCRIPTION
The ECM and skid control ECU (brake actuator assembly) send and receive signals via CAN communication.
If a communication error occurs between the ECM and skid control ECU (brake actuator 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 2.4 seconds or more (1 trip detection logic):
|
|
Does not come on |
DTC stored |
SAE Code: U0129 |
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 Corolla Corolla Hatchback [06/2018 - 09/2022]; M20A-FKS (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 engine switch on (IG).
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the engine switch off and wait for at least 30 seconds.
- Turn the engine switch on (IG) [A].
- Turn the Techstream on.
- Wait 5 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: U012987.
-
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. |
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC U012987) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: System Select / Health Check.
(e) Read the DTCs.
|
Result |
Proceed to |
|---|---|
|
DTC U012987 is output |
A |
|
DTC U012987 and other DTCs are output |
B |
HINT:
If any DTCs other than U012987 are output, troubleshoot those DTCs first.
| A |
|
| B |
|
GO TO DTC CHART |
|
|