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Home >> Toyota >> 2006 >> Highlander Hybrid, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System (3MZ-FE) (Hybrid) >> SFI System >> ECM Power Source Circuit >> Inspection Procedure

Inspection Procedure

  1. INSPECT HV CONTROL ECU (+B, +B1 VOLTAGE) 
    1. Turn the ignition switch ON.
    2. Measure the voltage between the terminals of the H17 and H14 HV Control ECU connectors.

    Standard voltage 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    +B1 (H17-2) - E1 (H14-5) 9 to 14 V
    +B2 (H17-1) - E1 (H14-5) 9 to 14 V

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON  PROBLEM SYMPTOMS TABLE  

    Fig 1: Identifying H17 And H14 HV Control ECU Connectors Terminal
    G04441393Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : Go to next step. 

  2. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - BODY GROUND) 
    1. Disconnect the H14 HV Control ECU connector.
    2. Measure the resistance between the HV Control ECU and body ground.

    Standard resistance (Check for open) 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    E1 (H14-5) - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    Fig 2: Disconnecting H14 HV Control ECU Connector Terminal
    G04441394Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : Go to next step. 

  3. INSPECT HV CONTROL ECU (IGSW VOLTAGE) 
    1. Turn the ignition switch ON.
    2. Measure the voltage between the terminals of the H12 and H14 HV Control ECU connectors.

    Standard voltage 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    IGSW (H12-9) - E1 (H14-5) 9 to 14 V

    OK: GO TO STEP   6 

    Fig 3: Identifying H12 And H14 HV Control ECU Connectors Terminal
    G04441395Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : Go to next step. 

  4. CHECK FUSE (IGN FUSE) 
    1. Remove the IGN fuse from the instrument panel J/B.
    2. Measure the IGN fuse resistance.

      Standard resistance: Below 1 Ω 

    3. Reinstall the IGN fuse.

    NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE 

    Fig 4: Identifying IGN Fuse Of Instrument Panel J/B
    G04441396Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : Go to next step. 

  5. INSPECT IGNITION SWITCH ASSEMBLY 
    1. Check for continuity between the connector terminals shown in the chart below.

    Standard 

    TERMINAL RESISTANCE CHART

    Switch Terminal No. Resistance
    LOCK All Terminals No continuity
    ACC 1 - 2 Continuity
    ON 2 - 3, 2 - 4, 3 - 4, 6 - 7 Continuity
    START 1 - 2, 1 - 4, 2 - 4, 6 - 7, 6 - 8, 7 - 8 Continuity

    NG: REPLACE IGNITION SWITCH ASSEMBLY 

    Fig 5: Identifying I14 Ignition Switch Assembly Connector Terminal
    G04441397Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: PUSH HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - HV CONTROL ECU) 

  6. INSPECT HV CONTROL ECU (MREL VOLTAGE) 
    1. Turn the ignition switch ON.
    2. Measure the voltage between the terminals of the H17 and H14 HV Control ECU connectors.

    Standard voltage 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    MREL (H17-12) - E1 (H14-5) 9 to 14 V

    NG: REPLACE HYBRID VEHICLE CONTROL ECU 

    Fig 6: Identifying H17 And H14 HV Control ECU Connectors Terminal
    G04441398Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : Go to next step. 

  7. CHECK FUSE (IGCT NO.2 FUSE) 
    1. Remove the IGCT No.2 fuse from the R/B No.3.
    2. Measure the IGCT No.2 fuse resistance.

      Standard resistance: Below 1 Ω 

    3. Reinstall the IGCT No.2 fuse.

    NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE 

    Fig 7: Identifying IGCT No.2 Fuse Of R/B No.3
    G04441399Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : Go to next step. 

  8. INSPECT IGCT RELAY 
    1. Remove the IGCT relay from the engine room R/B.
    2. Measure the IGCT relay resistance.

    Standard resistance 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    3 - 5 10 kΩ or higher
    Below 1 Ω
    (Apply battery voltage between terminals 1 and 2)

    NG: REPLACE INTEGRATION RELAY 

    Fig 8: Inspecting IGCT Relay
    G04441400Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : Go to next step. 

  9. CHECK HARNESS AND CONNECTOR (IGCT RELAY- HV CONTROL ECU, IGCT RELAY - BODY GROUND) 
    1. Check the harness and the connectors between the integration relay and the HV Control ECU.
      1. Remove the IGCT relay from the engine room R/B.
      2. Disconnect the H17 HV Control ECU connector.
      3. Measure the resistance between the wire harness side connectors.

        Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      IGCT relay (1)- MREL (H17-12) Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      IGCT relay (1) or MREL (H17-12) - Body ground 10 kΩ or higher
    2. Check the harness and the connectors between the integration relay and body ground.
      1. Remove the integration relay from the engine room R/B.
      2. Measure the resistance between the wire harness side connector and body ground.

        Standard resistance (Check for open) 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    IGCT relay (2) - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    Fig 9: Disconnecting H17 HV Control ECU Connector Terminal
    G04441401Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: CHECK AND REPAIR HARNESS AND CONNECTOR (TERMINAL +B OF HV CONTROL ECU - BATTERY POSITIVE TERMINAL) 

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