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 |
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P31241F | Lost Communication between Drive Motor "A" and HV ECU Circuit Intermittent | Error in reception from hybrid vehicle control ECU via serial communication (out of communication standard) detected when DTC P0C7917, P0D3319, P0E5717, P1C5D19 or P1C5F19 is stored. (1 trip detection logic) |
| Does not come on | Master Warning Light: Does not come on |
P312487 | Lost Communication between Drive Motor "A" and HV ECU 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 Light: Comes on |
MONITOR DESCRIPTION
If the motor generator control ECU detects a communication malfunction between it and the hybrid vehicle control ECU, it will illuminate the MIL and store a DTC.
MONITOR STRATEGY
Related DTCs | P3124 (INF P312487): Lost Communication With Hybrid Control Module (Hybrid Control Module, Drive Motor "A" bus) |
Required sensors/components | Motor generator control ECU Hybrid vehicle 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 P3124 (INF 312487) 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:
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HINT:
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
*a | Without waiting for 10 minutes |
NOTICE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
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PROCEDURE
1. | CLEAR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Motor Generator / Trouble Codes.
(e) Clear the DTCs.
Powertrain > Motor Generator > Clear DTCs(f) Turn the power switch off.
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2. | CHECK DIAGNOSIS RELATED INFORMATION AND 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 / Utility / Diagnosis Related Information.
Powertrain > Motor Generator > Utility Tester Display |
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Diagnosis Related Information |
(d) Enter the following menus: Powertrain / Motor Generator / Trouble Codes.
Powertrain > Motor Generator > Trouble Codes(e) Check for DTCs.
Result | Proceed to |
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P31241F or P312487 is listed in Diagnosis Related Information or DTC P31241F or P312487 is output. | A |
P31241F and P312487 is not listed in Diagnosis Information and DTC P31241F and P312487 is not output. | B |
(f) Turn the power 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 power switch on (IG).
(c) Measure the waveform.
HINT:
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(d) Turn the power switch off.
A | REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS |
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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 |
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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 power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
(b) Disconnect the A58 inverter with converter assembly connector.
(c) Disconnect the A33 hybrid vehicle control ECU connector.
(d) Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open):
Standard Resistance (Check for Short):
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. |
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(e) Connect the cable to the negative (-) auxiliary battery terminal.
(f) Turn the power switch on (IG).
(g) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
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A58-20 (HMCH) or A33-31 (HMCH) - Body ground and other terminals | Power switch on (IG) | Below 1 V |
A58-19 (HMCL) or A33-30 (HMCL) - Body ground and other terminals | Power switch on (IG) | Below 1 V |
NOTICE:
Turning the power switch on (IG) 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.
(h) Turn the power switch off.
(i) Reconnect the A33 hybrid vehicle control ECU connector.
(j) Reconnect the A58 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 A33 hybrid vehicle control ECU connector.
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(c) Reconnect the A33 hybrid vehicle control ECU connector.
OK | REPLACE HYBRID VEHICLE CONTROL ECU |
NG | REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS |