HYBRID CONTROL SYSTEM ECU Power Source Circuit

DESCRIPTION

When the power switch is turned on (IG), current flows from the MREL terminal of the power management control ECU to the IGCT relay. This closes the IGCT relay contact points and supplies power to the +B1 and +B2 terminals of the power management control ECU.

WIRING DIAGRAM

A0043BBE03

INSPECTION PROCEDURE

PROCEDURE


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


    1. Turn the power switch on (IG).

    2. A00403RE29
      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 Condition Specified Condition
      A21-5 (+B1) - Body ground Power switch on (IG) 11 to 14 V
      A20-2 (+B2) - Body ground Power switch on (IG) 11 to 14 V

    3. Turn the power 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 L5 and L6 power management control ECU connectors.

    2. A0042JVE12
      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
      L5-5 (E01) - Body ground Always Below 1 Ω
      L5-6 (E1) - Body ground Always Below 1 Ω
      L6-4 (E12) - Body ground Always Below 1 Ω
      L6-5 (E02) - Body ground Always Below 1 Ω

    3. Reconnect the L5 and L6 power management control ECU connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    GO TO PROBLEM SYMPTOMS TABLE Click here

  3. CHECK POWER MANAGEMENT CONTROL ECU (MREL VOLTAGE)


    1. Turn the power switch on (IG).

    2. A00403RE30
      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 Condition Specified Condition
      A21-6 (MREL) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  4. CHECK FUSE (IGCT NO. 2)


    1. Remove the IGCT NO. 2 fuse from the engine room relay block and junction block assembly.

    2. A0043UKE01
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT NO. 2 Fuse

      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 - ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY) Click here

    OK

  5. CHECK FUSE (IGCT)


    1. Remove the IGCT fuse from the engine room relay block and junction block assembly.

    2. A0042GXE01
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT Fuse

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

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

    3. Install the IGCT fuse.


    NG

    CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY (IGCT FUSE - IGCT NO. 2 FUSE)) Click here

    OK

  6. INSPECT RELAY (IGCT)


    1. Remove the IGCT relay from the engine room relay block and junction block assembly.

    2. A0041I6E01
      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 - ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY)


    1. Remove the IGCT No. 2 fuse from the engine room relay block and junction block assembly.

    2. Disconnect the A20 and A21 power management control ECU connectors.

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

      A0043IOE02
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly *2 IGCT No. 2 Fuse
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A21-5 (+B1) - 2 (IGCT No. 2 fuse) Always Below 1 Ω
      A20-2 (+B2) - 2 (IGCT No. 2 fuse) Always Below 1 Ω

    4. Install the IGCT No. 2 fuse.

    5. Reconnect the A20 and A21 power management control ECU connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY (IGCT RELAY - IGCT FUSE))


    1. A0040MKE01
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT Fuse

      Remove the IGCT fuse from the engine room relay block and junction block assembly.

    2. Remove the IGCT relay from the engine room relay block and junction block assembly.

    3. A0042WNE01
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT Fuse
      *3 IGCT Relay

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

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

    4. Install the IGCT fuse.

    5. Install the IGCT relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY)


    1. Remove the IGCT relay from the engine room relay block and junction block assembly.

    2. Disconnect the A21 power management control ECU connector.

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

      A0043XBE02
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly *2 IGCT Relay
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A21-6 (MREL) - 1 (IGCT relay) Always Below 1 Ω
      A21-6 (MREL) or 1 (IGCT relay) - Body ground and other terminals Always 10 kΩ or higher

    4. Install the IGCT relay.

    5. Reconnect the A21 power management control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - BODY GROUND)


    1. Remove the IGCT relay from the engine room relay block and junction block assembly.

    2. A00415NE01
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly
      *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.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  11. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Disconnect the A58 inverter with converter assembly connector.

    3. Disconnect the A22 transmission control ECU assembly connector.

    4. Remove the No. 1 hybrid vehicle battery shield panel Click here.

    5. Disconnect the c5 battery smart unit connector.

    6. A003ZXZE01
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 2 Fuse

      Remove the IGCT No. 2 fuse from the engine room relay block and junction block assembly.

    7. Disconnect the A20 and A21 power management control ECU connectors.

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

      A0043IOE02
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly *2 IGCT No. 2 Fuse
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A21-5 (+B1) or 2 (IGCT No. 2 fuse) - Body ground and other terminals Always 10 kΩ or higher
      A20-2 (+B2) or 2 (IGCT No. 2 fuse) - Body ground and other terminals Always 10 kΩ or higher

    9. Install the IGCT No. 2 fuse.

    10. Reconnect the A20 and A21 power management control ECU connectors.

    11. Reconnect the c5 battery smart unit connector.

    12. Install the No. 1 hybrid vehicle battery carrier bracket sub-assembly.

    13. Reconnect the A22 transmission control ECU assembly connector.

    14. Reconnect the A58 inverter with converter assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

    REPLACE FUSE (IGCT NO. 2)

  12. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY (IGCT FUSE - IGCT NO. 2 FUSE))


    1. A003ZZHE01
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT Fuse
      *3 IGCT No. 3 fuse
      *4 IGCT No. 2 fuse
      *5 PCU Fuse

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

    2. Remove the IGCT relay from the engine room relay block and junction block assembly.

    3. A0042WNE02
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT Fuse
      *3 IGCT Relay

      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 fuse) - Body ground and other terminals Always 10 kΩ or higher
    4. A0042AVE01
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 2 Fuse
      *3 IGCT Relay

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

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

    5. Install the IGCT fuse, IGCT No. 2 fuse, IGCT No. 3 fuse and PCU fuse.

    6. Install the IGCT relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

    REPLACE FUSE (IGCT)

  13. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    REPLACE FUSE (IGCT NO. 2)

  14. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    REPLACE FUSE (IGCT)