RX400h · Service Manual HYBRID SYSTEM

P0343-747

Diagnostic trouble codes

DESCRIPTION

Refer to the circuit description of DTC P0336-137. (Click here)
DTC No.
 INF Code
 DTC Detection Condition
 Trouble Area
P0343
 747
 GI signal is not input for 1 sec. or more while the engine is running.
  1. Wire harness or connector
  2. Crankshaft Position Sensor
  3. Crankshaft Position Sensor Plate
  4. HV control ECU
  5. w/ converter inverter assembly (MG ECU)
  6. SFI system

WIRING DIAGRAM

A114771E01

INSPECTION PROCEDURE

CAUTION:
  1. Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are working on the high-voltage system.
  2. After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.

HINT:
At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.


1. READ OUTPUT DTC (SFI SYSTEM)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position.

  1. Select the following menu items: Powertrain / Engine / DTC.

  1. Read output DTC. (Click here)

    Result:
    DTC is output.



 YES
GO TO DTC CHART
NO


2. READ OUTPUT DTC (HV)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position.

  1. Select the following menu items: Powertrain / Hybrid Control / DTC.

  1. Read output DTC. (Click here)

    Result:
    Any two or more of the following DTCs are output simultaneously:
    DTC No.
    		 Relevant Diagnosis
    P0A3F-243, P0A40-500, P0A4D-255, P0A1A-791, P0A1A-793, P0A1B-795, P0A41-245, P0A4B-253, P0A4C-513, P0A1A-792, P0A1B-794, P0A1B-796
    		 Motor resolver circuit, Generator resolver circuit



YES
GO TO DTC CHART
NO


3. CHECK CONNECTION CONDITION OF HYBRID VEHICLE CONTROL ECU CONNECTOR (LOOSENESS AND POOR CONTACT)

  1. A103658E18
    Check the connections of all HV control ECU connectors.

    OK:
    Connectors are connected securely and there is no poor connection.



NG
CONNECT SECURELY
OK


4. CHECK CONNECTION CONDITION OF MG ECU CONNECTOR (LOOSENESS AND POOR CONTACT)

CAUTION:
Be sure to wear insulated gloves.

  1. Turn the ignition switch off and remove the service plug grip. (Click here)

    NOTICE:
    Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.

  1. Remove the inverter cover. (Click here)

    NOTICE:
    1. Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
    2. Be sure to prevent water in the reservoir tank from entering the inverter.
    3. Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.

  1. A103665E03
    Check the connections of the MG ECU connectors.

    OK:
    Connectors are connected securely and there is no poor connection.



 NG
CONNECT SECURELY
OK


5. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - MG ECU)

CAUTION:
Be sure to wear insulated gloves.

  1. Disconnect the H31 HV control ECU connector.

  1. Disconnect the I25 MG ECU connector.

  1. A105200E03
    Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for open):
    Tester Connection
    		 Specified Condition
    GO (H31-15) - GI (I25-24)
    		 Below 1 Ω

    Standard Resistance (Check for short):
    Tester Connection
    		 Specified Condition
    GO (H31-15) or GI (I25-24) - Body ground
    		 10 kΩ or more



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6. CHECK HARNESS AND CONNECTOR (MG ECU - MOTOR RESOLVER)

CAUTION:
Be sure to wear insulated gloves.

  1. Check that the service plug grip is removed.

  1. Disconnect the M7 motor resolver connector.

  1. Disconnect the I24 MG ECU connector.

  1. A114849E02
    Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

    Standard Voltage:
    Tester Connection
    		 Specified Condition
    MRF (I24-13) - Body ground
    		 Below 1 V
    MRFG (I24-23) - Body ground
    		 Below 1 V
    MSN (I24-21) - Body ground
    		 Below 1 V
    MSNG (I24-20) - Body ground
    		 Below 1 V
    MCS (I24-19) - Body ground
    		 Below 1 V
    MCSG (I24-18) - Body ground
    		 Below 1 V

    NOTICE:
    Turning the ignition switch to the ON position with the MG ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing the inspection.

  1. Turn the ignition switch off.

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

    Standard Resistance (Check for open):
    Tester Connection
    		 Specified Condition
    MRF (I24-13) - MRF (M7-1)
    		 Below 1 Ω
    MRFG (I24-23) - MRFG (M7-4)
    		 Below 1 Ω
    MSN (I24-21) - MSN (M7-2)
    		 Below 1 Ω
    MSNG (I24-20) - MSNG (M7-5)
    		 Below 1 Ω
    MCS (I24-19) - MCS (M7-3)
    		 Below 1 Ω
    MCSG (I24-18) - MCSG (M7-6)
    		 Below 1 Ω

    Standard (Check for short):
    Tester Connection
    		 Specified Condition
    MRF (I24-13) or MRF (M7-1) - Body ground
    		 10 kΩ or more
    MRFG (I24-23) or MRFG (M7-4) - Body ground
    		 10 kΩ or more
    MSN (I24-21) or MSN (M7-2) - Body ground
    		 10 kΩ or more
    MSNG (I24-20) or MSNG (M7-5) - Body ground
    		 10 kΩ or more
    MCS (I24-19) or MCS (M7-3) - Body ground
    		 10 kΩ or more
    MCSG (I24-18) or MCSG (M7-6) - Body ground
    		 10 kΩ or more



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7. CHECK HARNESS AND CONNECTOR (MG ECU - GENERATOR RESOLVER)

  1. A105202E02
    Disconnect the M6 generator resolver connector.

  1. Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

    Standard Voltage:
    Tester Connection
    		 Specified Condition
    GRF (I24-12) - Body ground
    		 Below 1 V
    GRFG (I24-22) - Body ground
    		 Below 1 V
    GSN (I24-11) - Body ground
    		 Below 1 V
    GSNG (I24-10) - Body ground
    		 Below 1 V
    GCS (I24-9) - Body ground
    		 Below 1 V
    GCSG (I24-8) - Body ground
    		 Below 1 V

    NOTICE:
    Turning the ignition switch to the ON position with the MG ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing the inspection.

  1. Turn the ignition switch off.

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

    Standard Resistance (Check for open):
    Tester Connection
    		 Specified Condition
    GRF (I24-12) - GRF (M6-1)
    		 Below 1 Ω
    GRFG (I24-22) - GRFG (M6-6)
    		 Below 1 Ω
    GSN (I24-11) - GSN (M6-2)
    		 Below 1 Ω
    GSNG (I24-10) - GSNG (M6-7)
    		 Below 1 Ω
    GCS (I24-9) - GCS (M6-3)
    		 Below 1 Ω
    GCSG (I24-8) - GCSG (M6-8)
    		 Below 1 Ω

    Standard Resistance (Check for short):
    Tester Connection
    		 Specified Condition
    GRF (I24-12) or GRF (M6-1) - Body ground
    		 10 kΩ or more
    GRFG (I24-22) or GRFG (M6-6) - Body ground
    		 10 kΩ or more
    GSN (I24-11) or GSN (M6-2) - Body ground
    		 10 kΩ or more
    GSNG (I24-10) or GSNG (M6-7) - Body ground
    		 10 kΩ or more
    GCS (I24-9) or GCS (M6-3) - Body ground
    		 10 kΩ or more
    GCSG (I24-8) or GCSG (M6-8) - Body ground
    		 10 kΩ or more



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8. INSPECT HYBRID VEHICLE CONTROL ECU

  1. Using an ocilloscope, measure the waveform according to the value(s) in the table below.A109698E02

    Standard:
    Item
    		 Condition
    Terminal
    		 CH1: VV1+ - NE-
    CH2: VV2+ - NE-
    CH3: NE+ - NE-
    Equipment Setting
    		 2 V / DIV, 20 ms / DIV
    Condition
    		 After engine warmed up and idling

    HINT:
    1. Each amplitude becomes larger with an increase in engine speed.
    2. Each pulse cycle becomes shorter with an increase in engine speed.
    3. DTCs may be detected by noise.



 OK
REPLACE HYBRID VEHICLE CONTROL ECU
NG


9. INSPECT CRANKSHAFT POISITOIN SENSOR

  1. A064984E19
    Disconnect the C3 connector from the crankshaft position sensor.

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

    Standard Resistance:
    Tester Connection
    		 Condition
    		 Specified Condition
    1 - 2
    		 Cold
    		 1,630 to 2,740 Ω
    1 - 2
    		 Hot
    		 2,065 to 3,225 Ω

    HINT:
    Terms cold and hot refer to the temperature of the coils. "Cold" means approximately - 10 to 50°C (14 to 122°F). "Hot" means approximately 50 to 100°C (122 to 212°F).



 NG
REPLACE CRANKSHAFT POSITION SENSOR
OK


10. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - CRANKSHAFT POSITION SENSOR)

  1. A110906E05
    Disconnect the H32 connector from the HV control ECU.

  1. Disconnect the C3 connector from the crankshaft position sensor.

    Standard Resistance (Check for open):
    Tester Connection
    		 Specified Condition
    C3-1 - NE+ (H32-25)
    		 Below 1 Ω
    C3-2 - NE- (H32-24)
    		 Below 1 Ω

    Standard Resistance (Check for short):
    Tester Connection
    		 Specified Condition
    C3-1 or NE+ (H32-25) - Body ground
    		 10 kΩ or more
    C3-2 or NE- (H32-24) - Body ground
    		 10 kΩ or more



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


11. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

  1. BR03795E10
    Check the crankshaft position sensor installation.

    OK:
    Sensor is installed correctly.



 NG
TIGHTEN SENSOR
OK


12. CHECK CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE)

  1. Check the teeth of the sensor plate.

    OK:
    Sensor plate does not have any crack or deformation.



 NG
REPLACE CRANKSHAFT POSITION SENSOR PLATE
OK

REPLACE W/ CONVERTER INVERTER ASSEMBLY


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