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Home >> Toyota >> 2007 >> Highlander Hybrid, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System (Hybrid) >> SFI System >> ECM Power Source Circuit >> Inspection Procedure

Inspection Procedure

  1. INSPECT HV CONTROL ECU (+B, +B1 VOLTAGE) 
    1. Turn the ignition switch to the ON position.
    2. Measure the voltage between the terminals of the H17 and H14 HV control ECU connectors.
      Fig 1: Identifying H14 HV Control ECU Connector Terminals
      G05200197Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      VOLTAGE SPECIFICATION

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

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

    NG: Go to Next Step 

  2. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - BODY GROUND) 
    1. Disconnect the H14 HV control ECU connector.
      Fig 2: Disconnecting H14 HV Control ECU Connector
      G05200198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open) 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      E1 (H14-5) - Body ground Below 1 Ω
    3. Reconnect the HV control ECU connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  3. INSPECT HV CONTROL ECU (IGSW VOLTAGE) 
    1. Turn the ignition switch to the ON position.
    2. Measure the voltage between the terminals of the H12 and H14 HV control ECU connectors.
      Fig 3: Identifying H14 HV Control ECU Connector Terminals
      G05200199Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      VOLTAGE SPECIFICATION

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

    OK: Go to step  6

    NG: Go to Next Step 

  4. CHECK FUSE (IGN FUSE) 
    1. Remove the 1C and 1G instrument panel J/B connectors.
      Fig 4: Identifying Instrument Panel J/B Connectors
      G05200200Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the IGN fuse resistance.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Condition Specified Condition
      1C-1 - 1G-6 Below 1 Ω
    3. Reconnect the instrument panel J/B connector.

    NG: REPLACE INSTRUMENT PANEL J/B 

    OK: Go to Next Step 

  5. INSPECT IGNITION SWITCH ASSEMBLY 
    1. Check for continuity between the connector terminals shown in the table below.
      Fig 5: Identifying Ignition Switch Connector Terminals
      G05200201Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard 

      CONTINUITY REFERENCE

      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 

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

  6. INSPECT HV CONTROL ECU (MREL VOLTAGE) 
    1. Turn the ignition switch to the ON position.
    2. Measure the voltage between the terminals of the H17 and H14 HV control ECU connectors.
      Fig 6: Identifying H14 HV Control ECU Connector Terminals
      G05200202Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      VOLTAGE SPECIFICATION

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

    NG: REPLACE HV CONTROL ECU 

    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. Fig 7: Identifying IGCT No 2 Fuse
      G05200203Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 

    OK: Go to Next Step 

  8. INSPECT IGCT RELAY 
    1. Remove the IGCT relay from the engine room R/B No. 2.
      2. Fig 8: Inspecting IGCT Relay
      G04975584Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the IGCT relay resistance.

      Standard resistance 

      RESISTANCE SPECIFICATION

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

    NG: REPLACE IGCT RELAY 

    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 No. 2.
      2. Disconnect the H17 HV control ECU connector.
        Fig 9: Disconnecting H17 HV Control ECU Connector
        G05200205Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Measure the resistance according to the value(s) in the table below.

        Standard resistance (Check for open) 

        RESISTANCE SPECIFICATION

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

        Standard resistance (Check for short) 

        RESISTANCE SPECIFICATION

        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 IGCT relay and body ground.
      1. Remove the IGCT relay from the engine room R/B.
      2. Measure the resistance according to the value(s) in the table below.

        Standard resistance (Check for open) 

        RESISTANCE SPECIFICATION

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

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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