HYBRID CONTROL SYSTEM ECU Power Source Circuit

DESCRIPTION

If the ignition switch is on (IG), the power management control ECU applies current to the MREL terminal to turn the IGCT relay on. This supplies power to the +B1 and +B2 terminals.

WIRING DIAGRAM

A01V1H0E10

PROCEDURE


  1. CHECK POWER MANAGEMENT CONTROL ECU (+B1, +B2 VOLTAGE)


    1. Turn the ignition switch to ON (IG).

    2. A01UXOLE02
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A27-5 (+B1) - Body ground Ignition switch ON (IG) 11 to 14 V
      A26-2 (+B2) - Body ground Ignition switch ON (IG) 11 to 14 V

    3. Turn the ignition switch off.


    NG

    CHECK POWER MANAGEMENT CONTROL ECU (MREL VOLTAGE) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)


    1. Disconnect the power management control ECU connectors.

    2. A01UXUAE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F55-5 (E01) - Body ground Always Below 1 Ω
      F55-6 (E1) - Body ground Always Below 1 Ω
      F56-5 (E02) - Body ground Always Below 1 Ω

    3. Connect the power management control ECU connectors.


    OK

    GO TO PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK POWER MANAGEMENT CONTROL ECU (MREL VOLTAGE)


    1. Turn the ignition switch to ON (IG).

    2. A01V18TE01
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A27-6 (MREL) - Body ground Ignition switch ON (IG) 11 to 14 V

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  4. CHECK FUSE (IGCT NO. 2)


    1. A01UY2LE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 IGCT NO. 2 Fuse

      Remove the IGCT NO. 2 fuse from the No. 2 engine 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. 2 fuse terminals Always Below 1 Ω

    3. Install the IGCT NO. 2 fuse.


    NG

    CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 2 ENGINE ROOM RELAY BLOCK) Click here

    OK

  5. CHECK FUSE (IGCT-MAIN)


    1. A01V06QE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 IGCT-MAIN Fuse

      Remove the IGCT-MAIN fuse from the No. 2 engine room relay block.

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

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

    3. Install the IGCT-MAIN fuse.


    NG

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

    OK

  6. INSPECT RELAY (IGCT)


    1. Remove the IGCT relay from the No. 2 engine room relay block.

    2. A01UYTHE01
      Text in Illustration
      *1 IGCT 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 is not applied between terminals 1 and 2 10 kΩ or higher
      Auxiliary battery voltage is applied between terminals 1 and 2 Below 1 Ω

    3. Install the IGCT relay.


    NG

    REPLACE RELAY (IGCT)

    OK

  7. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 2 ENGINE ROOM RELAY BLOCK)


    1. Remove the IGCT relay from the No. 2 engine room relay block.

    2. Disconnect the power management control ECU connectors.

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

      A01UZCRE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block *2 IGCT Relay
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A27-5 (+B1) - 5 (IGCT relay) Always Below 1 Ω
      A26-2 (+B2) - 5 (IGCT relay) Always Below 1 Ω

    4. Install the IGCT relay.

    5. Connect the power management control ECU connectors.


    NG

    REPLACE FUSE (IGCT MAIN)

    OK

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


    1. Remove the IGCT MAIN fuse from the No. 2 engine room relay block.

    2. Remove the IGCT relay from the No. 2 engine room relay block.

    3. A01V1IUE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 IGCT Relay
      *3 IGCT MAIN Fuse

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (IGCT relay) - 2 (IGCT MAIN fuse) Always Below 1 Ω

    4. Install the IGCT MAIN fuse.

    5. Install the IGCT relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 2 ENGINE ROOM RELAY BLOCK)


    1. Remove the IGCT relay from the No. 2 engine room relay block.

    2. Disconnect the power management control ECU connector.

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

      A01V1KIE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block *2 IGCT Relay
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A27-6 (MREL) - 1 (IGCT relay) Always Below 1 Ω
      A27-6 (MREL) or 1 (IGCT relay) - Body ground and other terminals Always 10 kΩ or higher

    4. Install the IGCT relay.

    5. Connect the power management control ECU connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Remove the IGCT relay from the No. 2 engine room relay block.

    2. A01V12WE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 IGCT Relay

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

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

    3. Install the IGCT relay.


    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 2 ENGINE ROOM RELAY BLOCK)


    1. Disconnect connector C23 from the shift lever position sensor.

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

    3. Disconnect the power management control ECU connectors.

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

      A01V1G7E01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block *2 IGCT NO. 2 Fuse
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A27-5 (+B1) or 2 (IGCT NO. 2 fuse) - Body ground and other terminals Always 10 kΩ or higher
      A26-2 (+B2) or 2 (IGCT NO. 2 fuse) - Body ground and other terminals Always 10 kΩ or higher

    5. Install the IGCT NO. 2 fuse.

    6. Connect the shift lever position sensor connector.

    7. Connect the power management control ECU connectors.


    OK

    REPLACE FUSE (IGCT NO. 2)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

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


    1. A01UZ6FE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 IGCT MAIN Fuse
      *3 IGCT NO. 2 Fuse
      *4 PCU Fuse
      *5 IGCT NO. 3 Fuse

      Remove the IGCT MAIN fuse, IGCT NO. 2 fuse, IGCT NO. 3 fuse and PCU fuse from the No. 2 engine room relay block.

    2. Remove the IGCT relay from the No. 2 engine room relay block.

    3. A01V1IUE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 IGCT Relay
      *3 IGCT MAIN Fuse

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (IGCT relay) or 2 (IGCT MAIN fuse) - Body ground and other terminals Always 10 kΩ or higher
    4. A01UYPIE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 IGCT Relay
      *3 IGCT NO. 2 Fuse

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

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

    5. Install the IGCT MAIN fuse, IGCT NO. 2 fuse, IGCT NO. 3 fuse and PCU fuse.

    6. Install the IGCT relay.


    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

  13. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    REPLACE FUSE (IGCT NO. 2)

  14. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    REPLACE FUSE (IGCT MAIN)