Lexus ES: Lost Communication With ECM/PCM "A" Missing Message (U010087,U029387,U117087)
DESCRIPTION
The motor generator control ECU communicates with the hybrid vehicle control ECU, ECM and skid control ECU assembly via CAN communication.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| U010087 | Lost Communication With ECM/PCM "A" Missing Message | A CAN communication error between the ECM and motor generator control ECU (CAN communication system malfunction) occurs (1 trip detection logic) | CAN communication system | Comes on | Master Warning Light: Comes on |
| U029387 | Lost Communication With Hybrid Powertrain Control Module Missing Message | A CAN communication error between the hybrid vehicle control ECU and motor generator control ECU (CAN communication system malfunction) occurs (1 trip detection logic) | CAN communication system | Comes on | Master Warning Light: Comes on |
| U117087 | Lost Communication With Brake System Control Module(ch2) Missing Message | A CAN communication error between the skid control ECU assembly and motor generator control ECU (CAN communication system malfunction) occurs (1 trip detection logic) | CAN communication system | Comes on | Master Warning Light: Comes on |
MONITOR DESCRIPTION
If the motor generator control ECU detect problem with CAN communication with each ECU, it will illuminate the MIL and set a DTC.
MONITOR STRATEGY
| Related DTCs | U0100 (INF U010087): Lost Communication With ECM/PCM U0293 (INF U029387): Lost Communication With Hybrid Control Module U1170 (INF U117087): Lost Communication With Brake System Control Module |
| Required sensors/components | Motor generator control ECU |
| Frequency of operation | Continuous |
| Duration | TMC's intellectual property |
| MIL operation | Immediately |
| Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
| The monitor will run whenever the following DTCs are not stored | TMC's intellectual property |
| Other conditions belong to TMC's intellectual property | - |
TYPICAL MALFUNCTION THRESHOLDS
| TMC's intellectual property | - |
COMPONENT OPERATING RANGE
| Motor generator control ECU | DTC U0100 (INF U010087) is not detected DTC U0293 (INF U029387) is not detected DTC U1170 (INF U117087) is not detected |
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
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-
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) and 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 2 minutes or more.
- Turn the power switch on (IG) and turn the Techstream on.
-
With power switch on (IG) and wait for 2 minutes or more. [*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 / Motor Generator / Utility / All Readiness.
-
Check the DTC judgment result.
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.
PROCEDURE
| 1. | CHECK DTC OUTPUT (MOTOR GENERATOR CONTROL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / Motor Generator / Trouble Codes.
(d) Check for DTCs.
Powertrain > Motor Generator > Trouble Codes| Result | Proceed to |
|---|---|
| None of the following DTCs are output. | A |
| Any of the following DTCs are also output. | B |
| Relevant DTC | |
|---|---|
| P312487 | Lost Communication between Drive Motor "A" and HV ECU Missing Message |
HINT:
U010087, U029387 or U117087 may be stored due to a malfunction which also causes the DTCs in the preceding table to be stored. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output.
(e) Turn the power switch off.
| A | .gif) | GO TO CAN COMMUNICATION SYSTEM |
| B | | GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM) |
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