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 engine switch is on (IG), 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 sec. | | 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 more | | Engine switch |
On (IG) | | 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 
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG) and 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 2 minutes or more.
- Turn the engine switch on (IG) and turn the Techstream on.
- Wait for 2 seconds or more with the engine switch on (IG). [*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 |
- DTC judgment completed
- System 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 engine switch on (IG).
(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 |
|
A |
 | |
(a) Replace the ECM.
Click here
| NEXT |
| PERFORM REGISTRATION | | 
