DESCRIPTION
The motor generator control ECU, which is built into the inverter with converter assembly, controls the motor (MG2) based on commands from the hybrid vehicle control ECU.
The motor generator control ECU (MG ECU) monitors communication data and detects malfunctions.
DTC No. | Detection Item |
DTC Detection Condition |
Trouble Area | MIL |
Warning Indicate | Note |
---|---|---|---|---|---|---|
U11B300 | Lost Communication with Hybrid/EV Powertrain Control Module (ch5) (System 2) Missing Message |
Error in reception from hybrid vehicle control ECU via serial communication (out of communication standard) (1 trip detection logic) |
| Comes on |
Master Warning: Comes on |
SAE Code: U11B3 |
U11B387 | Lost Communication with Hybrid/EV Powertrain Control Module (ch5) Missing Message |
Error in reception from hybrid vehicle control ECU via serial communication (out of communication standard) (1 trip detection logic) |
| Comes on |
Master Warning: Comes on |
SAE Code: U11B3 |
MONITOR DESCRIPTION
The motor generator control ECU (MG ECU) monitors communication data and detects malfunctions, it will illuminate the MIL and store a DTC.
MONITOR STRATEGY
Related DTCs | U11B3 (INF U11B300/U11B387): Lost Communication With Hybrid Control Module |
Required sensors / components | Motor inverter |
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 U11B3 (INF U11B300/ U11B387) is not detected |
CONFIRMATION DRIVING PATTERN
HINT:
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HINT:
[*1]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
HINT:
WIRING DIAGRAM
Refer to the wiring diagram for the Inverter Low-voltage Circuit.
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CAUTION / NOTICE / HINT
CAUTION:
Refer to the precautions before inspecting high voltage circuit.
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NOTICE:
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HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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PROCEDURE
1. | CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Motor Generator > Clear DTCs(b) Turn the ignition switch off.
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2. | CHECK DIAGNOSIS RELATED INFORMATION AND DTC OUTPUT (MOTOR GENERATOR) |
(a) Turn the ignition switch to ON and wait for 2 minutes or more.
(b) Check for DTCs.
Powertrain > Motor Generator > Utility
Tester Display |
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Diagnosis Related Information |
Result | Proceed to |
---|---|
U11B300 or U11B387 is listed in Diagnosis Related Information or U11B300 or U11B387 is output. |
A |
U11B300 or U11B387 are not listed in Diagnosis Information and U11B300 and U11B387 are not output. |
B |
(c) Turn the ignition switch off.
B | CHECK FOR INTERMITTENT PROBLEMS |
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3. | CHECK HYBRID VEHICLE CONTROL ECU (CHECK WAVEFORM) |
(a) Connect an oscilloscope between the hybrid vehicle control ECU terminals specified in the following table.
(b) Turn the ignition switch to ON.
(c) Measure the waveform.
*a | Component with harness connected (Hybrid Vehicle Control ECU) |
- | - |
Item | Contents |
---|---|
Tester Connection |
CH1: A192-2 (HMCH) - I249-1 (E1) CH2: A192-1 (HMCL) - I249-1 (E1) |
Equipment Setting |
1 V/DIV., 200 μs./DIV. |
Condition | Ignition switch ON |
Result |
Proceed to |
---|---|
The waveform appears as shown in the illustration. |
A |
The waveform differs from the one shown in the illustration. |
B |
HINT:
(d) Turn the ignition switch off.
A | REPLACE INVERTER WITH CONVERTER ASSEMBLY |
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4. | CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) |
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NG | CONNECT SECURELY |
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5. | CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) |
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Result | Proceed to |
---|---|
OK | A |
NG (The connector is not connected securely.) |
B |
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) |
C |
B | CONNECT SECURELY |
C | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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6. | CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY) |
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
(b) Disconnect the inverter with converter assembly connector.
(c) Disconnect the hybrid vehicle control ECU connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Tester Connection | Condition |
Specified Condition |
---|---|---|
A187-29 (HMCH) - A192-2 (HMCH) |
Ignition switch off |
Below 1 Ω |
A187-30 (HMCL) - A192-1 (HMCL) |
Ignition switch off |
Below 1 Ω |
Standard Resistance (Check for Short):
Tester Connection | Condition |
Specified Condition |
---|---|---|
A187-29 (HMCH) or A192-2 (HMCH) - Body ground and other terminals |
Ignition switch off |
10 kΩ or higher |
A187-30 (HMCL) or A192-1 (HMCL) - Body ground and other terminals |
Ignition switch off |
10 kΩ or higher |
(e) Connect the cable to the negative (-) auxiliary battery terminal.
(f) Turn the ignition switch to ON.
(g) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition |
Specified Condition |
---|---|---|
A187-29 (HMCH) or A192-2 (HMCH) - Body ground and other terminals |
Ignition switch ON |
Below 1 V |
A187-30 (HMCL) or A192-1 (HMCL) - Body ground and other terminals |
Ignition switch ON |
Below 1 V |
NOTICE:
Turning the ignition switch to ON with the hybrid vehicle control ECU and inverter with converter assembly connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.
HINT:
As there might be an intermittent malfunction, inspect the following items even if the measured resistance is as specified.
Check that each connector between the inverter with converter assembly and hybrid vehicle control ECU is not loose or disconnected.
(h) Turn the ignition switch off.
(i) Reconnect the hybrid vehicle control ECU connector.
(j) Reconnect the inverter with converter assembly connector.
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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7. | CHECK INVERTER WITH CONVERTER ASSEMBLY |
(a) Disconnect the hybrid vehicle control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
---|---|---|
A192-2 (HMCH) - A192-1 (HMCL) |
Ignition switch off |
80 to 170 Ω |
(c) Reconnect the hybrid vehicle control ECU connector.
OK | REPLACE HYBRID VEHICLE CONTROL ECU |
NG | REPLACE INVERTER WITH CONVERTER ASSEMBLY |