DTC    P0A78-506    Drive Motor "A" Inverter Performance

DTC    P0A78-808    Drive Motor "A" Inverter Performance

for Preparation Click here


DESCRIPTION

For a description of the inverter (Click here).
If the motor inverter overheats, has a circuit malfunction, or has an internal short, the inverter transmits this information to the MG ECU via the motor inverter fail signal line.
If an abnormal amount of current flows through the motor inverter, the MG ECU detects it and sends a signal to inform the power management control ECU (HV CPU) of the malfunction.

DTC No.
INF Code
DTC Detection Condition
Trouble Area
P0A78
506
Motor inverter fail signal detection (overcurrent due to hybrid vehicle transaxle assembly malfunction)
  1. Inverter with converter assembly
  2. Hybrid vehicle transaxle assembly
  3. Wire harness or connector
P0A78
808
Abnormal MG2 current value detection (Hybrid vehicle transaxle assembly malfunction)

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0A1A-200 (Click here).

INSPECTION PROCEDURE

CAUTION:
  1. Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
  2. After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work (Click here).

    HINT:
    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

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 (Click here).

1.CHECK DTC OUTPUT (HYBRID CONTROL)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Enter the following menus: Powertrain / Hybrid Control / DTC.

  1. Check if DTCs are output.

    Result:
    Result
    		Proceed to
    P0A78-202 is not output.
    		A
    P0A78-202 is also output.
    		B

    NOTICE:
    1. If P0A78-202 is output, troubleshoot it first. After completing the troubleshooting for P0A78-202, return to perform troubleshooting for this DTC.
    2. Parts repaired or replaced during troubleshooting for P0A78-202 do not need to be re-inspected in this diagnosis procedure.

  1. Turn the power switch off.



B
GO TO DTC CHART (P0A78-202) (Click here)
A


2.CHECK DTC OUTPUT (HYBRID CONTROL)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Enter the following menus: Powertrain / Hybrid Control / DTC.

  1. Check if DTCs are output.

    HINT:
    1. If P0A78-202 was not output in step 1 of this diagnosis procedure, check Table 1 below.
    2. If P0A78-202 was output in step 1 of this diagnosis procedure, repair that DTC first, then check Table 2 below.

    Result:
    Result
    		Proceed to
    P0A78-506 or 808 only is output.
    		A
    Any of the following DTCs are also output.
    		B


    Table 1 
    DTC No.
    		Relevant Diagnosis
    P0A1A (all INF codes)*1
    		Generator Control Module
    P0A1B (all INF codes)*1
    		Drive Motor "A" Control Module
    P0A1D (all INF codes)*1
    		Hybrid Powertrain Control Module
    P0A3F-243
    		Drive Motor "A" Position Sensor Circuit
    P0A40-500
    		Drive Motor "A" Position Sensor Circuit Range/Performance
    P0A41-245
    		Drive Motor "A" Position Sensor Circuit Low
    P0A4B-253
    		Generator Position Sensor Circuit
    P0A4C-513
    		Generator Position Sensor Circuit Range/Performance
    P0A4D-255
    		Generator Position Sensor Circuit Low
    P0A60 (all INF codes)*1
    		Drive Motor "A" Phase V Current
    P0A63 (all INF codes)*1
    		Drive Motor "A" Phase W Current
    P0A72 (all INF codes)*1
    		Generator Phase V Current
    P0A75 (all INF codes)*1
    		Generator Phase W Current
    P0A78-266, 267, 586
    		Drive Motor "A" Inverter Performance
    P0A94-585, 587, 589, 590
    		DC/DC Converter Performance
    P0C76-523
    		Hybrid Battery System Discharge Time Too Long

    Table 2 
    DTC No.
    		Relevant Diagnosis
    P0A1A (all INF codes)*1
    		Generator Control Module
    P0A1B (all INF codes)*1
    		Drive Motor "A" Control Module
    P0A1D (all INF codes)*1
    		Hybrid Powertrain Control Module
    P0A3F-243
    		Drive Motor "A" Position Sensor Circuit
    P0A40-500
    		Drive Motor "A" Position Sensor Circuit Range/Performance
    P0A41-245
    		Drive Motor "A" Position Sensor Circuit Low
    P0A4B-253
    		Generator Position Sensor Circuit
    P0A4C-513
    		Generator Position Sensor Circuit Range/Performance
    P0A4D-255
    		Generator Position Sensor Circuit Low
    P0A60-294
    		Drive Motor "A" Phase V Current
    P0A63-302
    		Drive Motor "A" Phase W Current
    P0A72 (all INF codes)*1
    		Generator Phase V Current
    P0A75 (all INF codes)*1
    		Generator Phase W Current
    P0A78-266, 267, 586
    		Drive Motor "A" Inverter Performance
    P0A94-585, 587, 589, 590
    		DC/DC Converter Performance
    P0C76-523
    		Hybrid Battery System Discharge Time Too Long

    HINT:
    1. *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
    2. P0A78-506 or P0A78-808 may be set due to a malfunction which also causes DTCs in the preceding table to be set. 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.

  1. Turn the power switch off.



B
GO TO DTC CHART (HYBRID CONTROL SYSTEM) (Click here)
A


3.CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)
A214648

CAUTION:
Be sure to wear insulated gloves.

  1. 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.

NOTICE:
Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector does not pull out.

  1. Check the connection of the low voltage connector of the inverter with converter assembly.

    OK:
    The connector is connected securely and there are no contact problems.

    HINT:
    When connecting the connector, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.



NG
CONNECT SECURELY
OK


4.CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER)

CAUTION:
Be sure to wear insulated gloves.

  1. Disconnect the low voltage connector D28 from the inverter with converter assembly.

  1. Turn the power switch on (IG).



    A217747E09

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D28-11 (GRF) - Body ground
    		Power switch on (IG)
    		Below 1 V
    D28-12 (GRFG) - Body ground
    		Power switch on (IG)
    		Below 1 V
    D28-7 (GSN) - Body ground
    		Power switch on (IG)
    		Below 1 V
    D28-8 (GSNG) - Body ground
    		Power switch on (IG)
    		Below 1 V
    D28-10 (GCS) - Body ground
    		Power switch on (IG)
    		Below 1 V
    D28-9 (GCSG) - Body ground
    		Power switch on (IG)
    		Below 1 V

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Inverter with Converter Assembly)

    NOTICE:
    Turning the power switch on (IG) with the low voltage connector of the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

  1. Turn the power switch off.

  1. Connect the low voltage connector from the inverter with converter assembly.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK GENERATOR RESOLVER

  1. Disconnect the low voltage connector D28 from the inverter with converter assembly.



    A217747E09

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Switch Condition
    		Specified Condition
    D28-11 (GRF) - D28-12 (GRFG)
    		Power switch off
    		7.1 to 21.6 Ω
    D28-7 (GSN) - D28-8 (GSNG)
    		Power switch off
    		13.7 to 34.5 Ω
    D28-10 (GCS) - D28-9 (GCSG)
    		Power switch off
    		12.8 to 32.4 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Switch Condition
    		Specified Condition
    D28-11 (GRF) or D28-12 (GRFG) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D28-7 (GSN) or D28-8 (GSNG) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D28-10 (GCS) or D28-9 (GCSG) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Inverter with Converter Assembly)

  1. Connect the inverter with converter assembly connector.



NG
Go to step 10
OK


6.CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER)

CAUTION:
Be sure to wear insulated gloves.

  1. Disconnect the low voltage connector D28 from the inverter with converter assembly.

  1. Turn the power switch on (IG).



    A217747E10

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D28-1 (MRF) - Body ground
    		Power switch on (IG)
    		Below 1 V
    D28-2 (MRFG) - Body ground
    		Power switch on (IG)
    		Below 1 V
    D28-3 (MSN) - Body ground
    		Power switch on (IG)
    		Below 1 V
    D28-4 (MSNG) - Body ground
    		Power switch on (IG)
    		Below 1 V
    D28-6 (MCS) - Body ground
    		Power switch on (IG)
    		Below 1 V
    D28-5 (MCSG) - Body ground
    		Power switch on (IG)
    		Below 1 V

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Inverter with Converter Assembly)

    NOTICE:
    Turning the power switch on (IG) with the low voltage connector of the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

  1. Turn the power switch off.

  1. Connect the inverter with converter assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK MOTOR RESOLVER

  1. Disconnect the low voltage connector D28 from the inverter with converter assembly.



    A217747E10

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Switch Condition
    		Specified Condition
    D28-1 (MRF) - D28-2 (MRFG)
    		Power switch off
    		7.1 to 21.6 Ω
    D28-3 (MSN) - D28-4 (MSNG)
    		Power switch off
    		13.7 to 34.5 Ω
    D28-6 (MCS) - D28-5 (MCSG)
    		Power switch off
    		12.8 to 32.4 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Switch Condition
    		Specified Condition
    D28-1 (MRF) or D28-2 (MRFG) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D28-3 (MSN) or D28-4 (MSNG) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D28-6 (MCS) or D28-5 (MCSG) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Inverter with Converter Assembly)

  1. Connect the inverter with converter assembly connector.



NG
Go to step 12
OK


8.CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)


    A240800

  1. Check the connection of the generator resolver connector.

    OK:
    The connector is connected securely and there are no contact problems.



NG
CONNECT SECURELY
OK


9.CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR)


    A240801

  1. Check the connection of the motor resolver connector.

    OK:
    The connector is connected securely and there are no contact problems.



NG
CONNECT SECURELY
OK

REPLACE INVERTER WITH CONVERTER ASSEMBLY (Click here)  

10.CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)


    A240800

  1. Check the connection of the generator resolver connector.

    OK:
    The connector is connected securely and there are no contact problems.



NG
CONNECT SECURELY
OK


11.CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER)

  1. Disconnect the low voltage connector D28 from the inverter with converter assembly.



    A217748E05

  1. Disconnect the generator resolver connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Switch Condition
    		Specified Condition
    D7-1 (GRF) - D28-11 (GRF)
    		Power switch off
    		Below 1 Ω
    D7-5 (GRFG) - D28-12 (GRFG)
    		Power switch off
    		Below 1 Ω
    D7-2 (GSN) - D28-7 (GSN)
    		Power switch off
    		Below 1 Ω
    D7-6 (GSNG) - D28-8 (GSNG)
    		Power switch off
    		Below 1 Ω
    D7-3 (GCS) - D28-10 (GCS)
    		Power switch off
    		Below 1 Ω
    D7-7 (GCSG) - D28-9 (GCSG)
    		Power switch off
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Switch Condition
    		Specified Condition
    D7-1 (GRF) or D28-11 (GRF) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D7-5 (GRFG) or D28-12 (GRFG) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D7-2 (GSN) or D28-7 (GSN) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D7-6 (GSNG) or D28-8 (GSNG) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D7-3 (GCS) or D28-10 (GCS) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D7-7 (GCSG) or D28-9 (GCSG) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Generator Resolver)
    *b
    		Front view of wire harness connector
    (to Inverter with Converter Assembly)

    HINT:
    The generator resolver is not available separately. If it requires replacement, replace the hybrid vehicle transaxle assembly.

  1. Connect the generator resolver connector.

  1. Connect the inverter with converter assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY (Click here)  

12.CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR)


    A240801

  1. Check the connection of the motor resolver connector.

    OK:
    The connector is connected securely and there are no contact problems.



NG
CONNECT SECURELY
OK


13.CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER)

  1. Disconnect the low voltage connector D28 from the inverter with converter assembly.



    A217749E06

  1. Disconnect the motor resolver connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Switch Condition
    		Specified Condition
    D1-3 (MRF) - D28-1 (MRF)
    		Power switch off
    		Below 1 Ω
    D1-6 (MRFG) - D28-2 (MRFG)
    		Power switch off
    		Below 1 Ω
    D1-1 (MSN) - D28-3 (MSN)
    		Power switch off
    		Below 1 Ω
    D1-4 (MSNG) - D28-4 (MSNG)
    		Power switch off
    		Below 1 Ω
    D1-2 (MCS) - D28-6 (MCS)
    		Power switch off
    		Below 1 Ω
    D1-5 (MCSG) - D28-5 (MCSG)
    		Power switch off
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Switch Condition
    		Specified Condition
    D1-3 (MRF) or D28-1 (MRF) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D1-6 (MRFG) or D28-2 (MRFG) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D1-1 (MSN) or D28-3 (MSN) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D1-4 (MSNG) or D28-4 (MSNG) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D1-2 (MCS) or D28-6 (MCS) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher
    D1-5 (MCSG) or D28-5 (MCSG) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Motor Resolver)
    *b
    		Front view of wire harness connector
    (to Inverter with Converter Assembly)

    HINT:
    The motor resolver is not available separately. If it requires replacement, replace the hybrid vehicle transaxle assembly.

  1. Connect the motor resolver connector.

  1. Connect the inverter with converter assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY (Click here)