- DTC judgment completed
- System normal
| Last Modified: 05-08-2025 | 6.11:8.1.0 | Doc ID: RM100000001FOO8 |
| Model Year Start: 2019 | Model: RAV4 | Prod Date Range: [11/2018 - ] |
| Title: UB80E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: U010087; Lost Communication with ECM/PCM "A" Missing Message; 2019 - 2025 MY RAV4 [11/2018 - ] | ||
|
DTC |
U010087 |
Lost Communication with ECM/PCM "A" Missing Message |
DESCRIPTION
The engine control unit and transmission control unit are located inside the ECM. The engine control unit intercommunicates with the transmission control unit using CAN communication.
If there is a problem in this intercommunication, the ECM stores this DTC.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Memory |
Note |
|---|---|---|---|---|---|---|
|
U010087 |
Lost Communication with ECM/PCM "A" Missing Message |
While the ignition switch is ON, there is no communication between the engine control unit and transmission control unit for 1.25 seconds or more (1-trip detection logic). |
ECM |
Comes on |
DTC stored |
SAE Code: U0100 |
MONITOR STRATEGY
|
Related DTCs |
U0100: Verify communication |
|
Required sensors/components (Main) |
ECM |
|
Required sensors/components (Related) |
- |
|
Frequency of Operation |
Continuous |
|
Duration |
1.25 seconds |
|
MIL Operation |
Immediately |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
The monitor will run whenever the following DTCs are not stored |
None |
|
Battery Voltage |
10.5 V or higher |
|
Ignition switch |
ON |
|
Starter |
Off |
TYPICAL MALFUNCTION THRESHOLDS
|
Communication signal |
Lost communication with ECM/PCM |
CONFIRMATION DRIVING PATTERN
HINT:
- After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
-
When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.
Click here
![2019 - 2025 MY RAV4 [11/2018 - ]; UB80E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off and wait for 30 seconds or more.
- Turn the ignition switch to ON and turn the Techstream on.
-
Wait for 3 seconds or more with the ignition switch ON. [*1]
HINT:
[*1]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
- Input the DTC: U010087.
-
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
N/A
- Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.
CAUTION / NOTICE / HINT
NOTICE:
-
Perform the universal trip to clear permanent DTCs.
Click here
-
Perform registration and/or initialization when parts related to the automatic transaxle are replaced.
Click here
PROCEDURE
|
1. |
CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U010087) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Transmission / Trouble Codes.
Powertrain > Transmission > Trouble Codes
(e) Read the DTCs using the Techstream.
|
Result |
Proceed to |
|---|---|
|
Only DTC U010087 is output |
A |
|
DTC U010087 and other DTCs are output |
B |
| B |
|
GO TO DTC CHART
|
|
|
2. |
REPLACE ECM |
(a) Replace the ECM.
Click here
| NEXT |
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