HYBRID CONTROL SYSTEM ECU Power Source Circuit

DESCRIPTION

If the power switch is on (IG), the hybrid vehicle control ECU assembly applies current to the MREL terminal to turn the IGCT NO.1 relay on. This supplies power to the +B1 and +B2 terminals.

WIRING DIAGRAM

B000PYZE01
*a IGCT NO.1
*b No. 2 Luggage Room Relay Block
*c Auxiliary Battery
*d Hybrid Vehicle Control ECU Assembly

PROCEDURE


  1. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (+B1, +B2 VOLTAGE)


    1. Turn the power switch on (IG).

    2. B000RSMC92
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      P64-4 (+B1) - Body ground Power switch on (IG) 11 to 14 V
      P65-3 (+B2) - Body ground Power switch on (IG) 11 to 14 V

    3. Turn the power switch off.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (MREL VOLTAGE) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - BODY GROUND)


    1. Disconnect the A21, P64 and P65 hybrid vehicle control ECU assembly connectors.

    2. B000Q39C03
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P64-6 (E1) - Body ground Always Below 1 Ω
      P65-6 (E12) - Body ground Always Below 1 Ω
      A21-2 (E01) - Body ground Always Below 1 Ω
      P64-2 (E02) - Body ground Always Below 1 Ω

    3. Reconnect the A21, P64 and P65 hybrid vehicle control ECU assembly connectors.

      Result
      Proceed to
      OK
      NG

    OK

    GO TO PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (MREL VOLTAGE)


    1. Turn the power switch on (IG).

    2. B000RSMC93
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A22-1 (MREL) - Body ground Power switch on (IG) 11 to 14 V

    3. Turn the power switch off.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here

    OK

  4. CHECK FUSE (PM-IGCT)


    1. B000TGSC02
      *1 No. 2 Luggage Room Relay Block
      *2 PM-IGCT Fuse

      Remove the PM-IGCT fuse from the No. 2 luggage room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      PM-IGCT fuse terminals Always Below 1 Ω

    3. Install the PM-IGCT fuse.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 2 LUGGAGE ROOM RELAY BLOCK) Click here

    OK

  5. CHECK FUSE (IGCT NO.1)


    1. B000NVUC03
      *1 No. 2 Luggage Room Relay Block
      *2 IGCT NO.1 Fuse

      Remove the IGCT NO.1 fuse from the No. 2 luggage room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IGCT NO.1 fuse terminals Always Below 1 Ω

    3. Install the IGCT NO.1 fuse.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (NO. 2 LUGGAGE ROOM RELAY BLOCK) Click here

    OK

  6. INSPECT RELAY (IGCT NO.1)


    1. B000O6UC02
      *1 No. 2 Luggage Room Relay Block
      *2 IGCT NO.1 Relay

      Remove the IGCT NO.1 relay from the No. 2 luggage room relay block.

    2. B000QKLC01
      *1 IGCT NO.1 Relay

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Auxiliary battery voltage not applied between terminals 1 and 2 10 kΩ or higher
      Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω

    3. Install the IGCT NO.1 relay.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RELAY (IGCT NO.1)

    OK

  7. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 2 LUGGAGE ROOM RELAY BLOCK)


    1. Disconnect the P64 and P65 hybrid vehicle control ECU assembly connectors.

    2. B000TGSC02
      *1 No. 2 Luggage Room Relay Block
      *2 PM-IGCT Fuse

      Remove the PM-IGCT fuse from the No. 2 luggage room relay block.

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

      B000RHAC03
      *1 No. 2 Luggage Room Relay Block *2 PM-IGCT Fuse
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      P64-4 (+B1) - 2 (PM-IGCT fuse) Always Below 1 Ω
      P65-3 (+B2) - 2 (PM-IGCT fuse) Always Below 1 Ω

    4. Reconnect the P64 and P65 hybrid vehicle control ECU assembly connectors.

    5. Install the PM-IGCT fuse.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (NO. 2 LUGGAGE ROOM RELAY BLOCK)


    1. B000RYNC02
      *1 No. 2 Luggage Room Relay Block
      *2 PM-IGCT Fuse
      *3 IGCT NO.1 Fuse
      *4 IGCT NO.1 Relay

      Remove the IGCT NO.1 fuse, PM-IGCT fuse and IGCT NO.1 relay from the No. 2 luggage room relay block.

    2. B000R41C02
      *1 No. 2 Luggage Room Relay Block
      *2 PM-IGCT Fuse
      *3 IGCT NO.1 Fuse
      *4 IGCT NO.1 Relay

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (IGCT NO.1 relay) - 2 (IGCT NO.1 fuse) Always Below 1 Ω
      5 (IGCT NO.1 relay) - 1 (PM-IGCT fuse) Always Below 1 Ω

    3. Install the IGCT NO.1 fuse, PM-IGCT fuse and IGCT NO.1 relay.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 2 LUGGAGE ROOM RELAY BLOCK)


    1. Disconnect the A22 hybrid vehicle control ECU assembly connector.

    2. B000O6UC02
      *1 No. 2 Luggage Room Relay Block
      *2 IGCT NO.1 Relay

      Remove the IGCT NO.1 relay from the No. 2 luggage room relay block.

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

      B000QJRC02
      *1 No. 2 Luggage Room Relay Block *2 IGCT NO.1 Relay
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A22-1 (MREL) - 1 (IGCT NO.1 relay) Always Below 1 Ω
      A22-1 (MREL) or 1 (IGCT NO.1 relay) - Body ground and other terminals Always 10 kΩ or higher

    4. Install the IGCT NO.1 relay.

    5. Reconnect the A22 hybrid vehicle control ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (NO. 2 LUGGAGE ROOM RELAY BLOCK - BODY GROUND)


    1. B000O6UC02
      *1 No. 2 Luggage Room Relay Block
      *2 IGCT NO.1 Relay

      Remove the IGCT NO.1 relay from the No. 2 luggage room relay block.

    2. B004B8XC02
      *1 No. 2 Luggage Room Relay Block
      *2 IGCT NO.1 Relay

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (IGCT NO.1 relay) - Body ground Always Below 1 Ω

    3. Install the IGCT NO.1 relay.

      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 2 LUGGAGE ROOM RELAY BLOCK)


    1. B000TGSC02
      *1 No. 2 Luggage Room Relay Block
      *2 PM-IGCT Fuse

      Remove the PM-IGCT fuse from the No. 2 luggage room relay block.

    2. Disconnect the P64 and P65 hybrid vehicle control ECU assembly connectors.

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

      B000RHAC02
      *1 No. 2 Luggage Room Relay Block *2 PM-IGCT Fuse
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      P64-4 (+B1) or 2 (PM-IGCT fuse) - Body ground and other terminals Always 10 kΩ or higher
      P65-3 (+B2) or 2 (PM-IGCT fuse) - Body ground and other terminals Always 10 kΩ or higher

    4. Reconnect the P64 and P65 hybrid vehicle control ECU assembly connectors.

    5. Install the PM-IGCT fuse.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FUSE (PM-IGCT)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

  12. CHECK HARNESS AND CONNECTOR (NO. 2 LUGGAGE ROOM RELAY BLOCK)


    1. B000RYNC02
      *1 No. 2 Luggage Room Relay Block
      *2 PM-IGCT Fuse
      *3 IGCT NO.1 Fuse
      *4 IGCT NO.1 Relay

      Disconnect the IGCT NO.1 fuse, PM-IGCT fuse and IGCT NO.1 relay from the No. 2 luggage room relay block.

    2. B000R41C02
      *1 No. 2 Luggage Room Relay Block
      *2 PM-IGCT Fuse
      *3 IGCT NO.1 Fuse
      *4 IGCT NO.1 Relay

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

      Standard Resistance:
      Tester Connection Condition Specified Condition
      3 (IGCT NO.1 relay) or 2 (IGCT NO.1 fuse) - Body ground and other terminals Always 10 kΩ or higher
      5 (IGCT NO.1 relay) or 1 (PM-IGCT fuse) - Body ground and other terminals Always 10 kΩ or higher

    3. Install the IGCT NO.1 fuse, PM-IGCT fuse and IGCT NO.1 relay.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FUSE (IGCT NO.1)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

  13. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Result
    Proceed to
    NEXT

    NEXT

    REPLACE FUSE (PM-IGCT)

  14. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Result
    Proceed to
    NEXT

    NEXT

    REPLACE FUSE (IGCT NO.1)