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Home >> Lexus >> 2006 >> RX 400h AWD >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Vehicle Control (P310) - RX400H - DTC P0A7A-309 Through P0AA7-727 >> DTC P0A93-346 Inverter Cooling System Performance; DTC P0A93-347 Inverter Cooling System Performance >> Inspection Procedure

Inspection Procedure

CAUTION:
  • 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.
  • 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 (HV) 
    1. Put the vehicle into the READY-on state and wait for 10 seconds or more.
    2. Connect the intelligent tester to the DLC3.
    3. Turn the ignition switch to the ON position.
    4. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DTC INFO / CURRENT CODES.
    5. Read output DTCs. (See DTC CHECK / CLEAR )

      Result: 

      The DTC shown in the table below is output 

      OUTPUT DTC (HV)

      DTC No. Relevant Diagnosis
      P0A05-776 Water pump malfunction

    YES: GO TO  DIAGNOSTIC TROUBLE CODE CHART 

    NO: GO TO NEXT STEP 

  2. CHECK QUANTITY OF HV COOLANT 
    1. Check the inverter coolant level.

      OK: 

      There is sufficient amount of coolant for the inverter. 

    NG: CHECK FOR COOLANT LEAKS AND ADD COOLANT 

    OK: GO TO NEXT STEP 

  3. CHECK COOLANT HOSE 
    1. Check if the hoses of the cooling system are not bent or clogged.

      OK: 

      The hoses of the cooling system are not bent or clogged. 

    Fig 1: Checking Coolant Hose
    G04112159Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CORRECT TO NORMAL CONDITION 

    OK: GO TO NEXT STEP 

  4. CHECK CONNECTION CONDITION OF WATER PUMP CONNECTOR (LOOSENESS AND POOR CONTACT) 
    1. Check the connection of the water pump w/ motor connector.

      OK: 

      Connector is connected securely and there is no poor connection. 

    Fig 2: Identifying Water Pump W/ Motor And Bracket Assembly Connector
    G04112160Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CONNECT SECURELY 

    OK: GO TO NEXT STEP 

  5. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (WATER PUMP) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / ACTIVE TEST / WATER PUMP.
    4. During the WATER PUMP active test, check operation of the water pump.

      OK: 

      There are ripples in the reservoir tank coolant. 

      HINT:

      The water pump is also activated in the READY-on state.

    NG: Go to step   8 

    OK: GO TO NEXT STEP 

  6. CHECK CONNECTION CONDITION OF COOLING FAN CONNECTOR (LOOSENESS AND POOR CONTACT) 
    1. Check the connection of the electric cooling fan connector.

      OK: 

      Connector is connected securely and there is no poor connection. 

    NG: CONNECT SECURELY 

    OK: GO TO NEXT STEP 

  7. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (COOLING FAN) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ENGINE / ACTIVE TEST / COOLING FAN.
    4. During the COOLING FAN activate test, check operation of the electric cooling fan.

      OK: 

      The electric cooling fan operates. 

    NG: CHECK COOLING FAN CIRCUIT 

    OK: REPLACE W/ CONVERTER INVERTER ASSEMBLY 

  8. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - WATER PUMP) 
    1. Turn the ignition switch off.
    2. Disconnect the H29 connector from the HV control ECU.
    3. Disconnect the W5 water pump connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      HV CONTROL ECU - WATER PUMP (CHECK FOR OPEN)

      Tester Connection Specified Condition
      NIWP (H29-29) - NWP (W5-1) Below 1 Ω
      IWP (H29-23) - SWP (W5-2) Below 1 Ω

      Standard Resistance (Check for short) 

      HV CONTROL ECU - WATER PUMP (CHECK FOR SHORT)

      Tester Connection Specified Condition
      NIWP (H29-29) or NWP (W5-1)- Body ground 10 kΩ or higher
      IWP (H29-23) or SWP (W5-2)- Body ground 10 kΩ or higher
      Fig 3: Identifying Water Pump W/ Motor And Bracket Assembly Connector
      G04112161Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  9. CHECK HARNESS AND CONNECTOR (WATER PUMP - INV W/P FUSE, WATER PUMP - BODY GROUND) 
    1. Turn the ignition switch off.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      WATER PUMP - INV W/P FUSE, WATER PUMP - BODY GROUND (CHECK FOR OPEN)

      Tester Connection Specified Condition
      +B (W5-4) - Engine Room R/B No. 2 INV W/P fuse terminal 2 Below 1 Ω
      GND (W5-3) - Body ground Below 1 Ω

      Standard Resistance (Check for short) 

      WATER PUMP - INV W/P FUSE, WATER PUMP - BODY GROUND (CHECK FOR SHORT)

      Tester Connection Specified Condition
      +B (W5-4) or Engine Room R/B No. 2 INV W/P fuse terminal 2 - Body ground 10 kΩ or higher
      Fig 4: Checking Harness And Connector (Water Pump - INV W/P Fuse, Water Pump - Body Ground)
      G04112162Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  10. CHECK HYBRID VEHICLE CONTROL ECU 
    1. Connect the HV control ECU connector.
    2. Put the vehicle into the READY-on state.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      HYBRID VEHICLE CONTROL ECU

      Tester Connection Specified Condition
      IWP (H29-23) - Body ground Below 1 V
      Fig 5: Checking Hybrid Vehicle Control ECU Connector
      G04112163Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to step   12 

    NG: GO TO NEXT STEP 

  11. INSPECT WATER PUMP W/ MOTOR & BRACKET ASSEMBLY 
    1. Disconnect the H29 HV control ECU Connector.
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      WATER PUMP W/ MOTOR & BRACKET ASSEMBLY

      Tester Connection Specified Condition
      IWP (H29-23) - E1 (H31-5) 10 to 14 V
      Fig 6: Inspecting Water Pump W/Motor And Bracket Assembly
      G04112164Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE WATER PUMP W/ MOTOR & BRACKET ASSEMBLY 

    OK: REPLACE HYBRID VEHICLE CONTROL ECU 

  12. INSPECT HYBRID VEHICLE CONTROL ECU 
    1. Connect the HV control ECU connector.
    2. Put the vehicle into the READY-on state.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      HYBRID VEHICLE CONTROL ECU

      Tester Connection Specified Condition
      IWP (H29-23) - E7 (H31-5) 10 to 14 V
      Fig 7: Inspecting Hybrid Vehicle Control ECU
      G04112165Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HYBRID VEHICLE CONTROL ECU 

    OK: REPLACE WATER PUMP W/ MOTOR & BRACKET ASSEMBLY 

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