HYBRID CONTROL SYSTEM ECU Power Source Circuit

DESCRIPTION

If the power 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

A01FQV9E03

Refer to the wiring diagram for DTC P0A08-264 Click here.

INSPECTION PROCEDURE

PROCEDURE


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


    1. Turn the power switch on (IG).

    2. A01FVOIE16
      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
      A36-3 (+B1) - Body ground Power switch on (IG) 11 to 14 V
      A35-1 (+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 connector from the power management control ECU.

    2. A01FUAOE10
      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
      N91-5 (E01) - Body ground Always Below 1 Ω
      N91-6 (E1) - Body ground Always Below 1 Ω
      N92-4 (E12) - Body ground Always Below 1 Ω
      N92-5 (E02) - Body ground Always Below 1 Ω

    3. Connect the power management control ECU connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  3. CHECK POWER MANAGEMENT CONTROL ECU (MREL VOLTAGE)


    1. Turn the power switch on (IG).

    2. A01FVOIE17
      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
      A35-4 (MREL) - Body ground Power switch on (IG) 11 to 14 V

    3. Turn the power switch off.


    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  4. CHECK FUSE (IGCT NO. 5)


    1. A01FUV9E01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 5 Fuse

      Remove the IGCT No. 5 fuse from the No. 1 engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IGCT No. 5 fuse terminals Always Below 1 Ω

    3. Install the IGCT No. 5 fuse.


    NG

    CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY) Click here

    OK

  5. CHECK FUSE (IGCT NO. 1)


    1. A01FTYME01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 1 Fuse

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

    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.


    NG

    CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY) Click here

    OK

  6. INSPECT RELAY (IGCT)


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

    2. A01FSV8E01
      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. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY)


    1. A01FUV9E01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 5 Fuse

      Remove the IGCT No. 5 fuse from the No. 1 engine room relay block and junction block assembly.

    2. Disconnect the connector from the power management control ECU.

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

      A01FT4ME02
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly *2 IGCT No. 5 Fuse
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A36-3 (+B1) - 2 (IGCT No. 5 fuse) Always Below 1 Ω
      A35-1 (+B2) - 2 (IGCT No. 5 fuse) Always Below 1 Ω

    4. Install the IGCT No. 5 fuse.

    5. Connect the power management control ECU connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY)


    1. A01FU6XE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 1 Fuse
      *3 IGCT No. 5 Fuse
      *4 IGCT Relay

      Remove the IGCT No. 1 fuse, IGCT No. 5 fuse and IGCT relay from the No. 1 engine room relay block and junction block assembly.

    2. A01FU2IE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 1 Fuse
      *3 IGCT No. 5 Fuse
      *4 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 No. 1 fuse) Always Below 1 Ω
      5 (IGCT relay) - 1 (IGCT No. 5 fuse) Always Below 1 Ω

    3. Install the IGCT No. 1 fuse, IGCT No. 5 fuse and IGCT relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY)


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

    2. Disconnect the connector from the power management control ECU.

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

      A01FT29E01
      Text in Illustration
      *1 No. 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
      A35-4 (MREL) - 1 (IGCT relay) Always Below 1 Ω
      A35-4 (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. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - BODY GROUND)


    1. A01FV5WE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT Relay

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

    2. 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

  11. CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY)


    1. A01FQ5ME01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 AMD Terminal
      *3 IGCT No. 1 Fuse

      Disconnect the inverter bus-bar plate sub-assembly from the AMD terminal (No. 1 engine room relay block and junction block assembly side).

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

    3. A01FSEZE02
      Text in Illustration
      *A for LHD
      *B for RHD
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 1 Fuse

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      1L-1 (AMD) - 1 (IGCT No. 1 fuse) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      1K-1 (AMD) - 1 (IGCT No. 1 fuse) Always Below 1 Ω

    4. Install the IGCT No. 1 fuse.

    5. Connect the AMD terminal.


    NG

    Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  12. CHECK FUSIBLE LINK BLOCK ASSEMBLY (DC / DC)


    1. Check the fusible link block assembly (DC/DC) in the No. 1 engine room relay block and junction block assembly for improper installation.

      OK
      The fusible link is installed securely.

    2. Remove the fusible link block assembly from the No. 1 engine room relay block and junction block assembly.

    3. A01FRZUE01
      Text in Illustration
      *1 Fusible Link Block Assembly

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Fusible link block assembly (DC/DC) 1 - 2 Always Below 1 Ω

    4. Install the fusible link block assembly.


    NG

    REPLACE FUSIBLE LINK BLOCK ASSEMBLY (DC / DC)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY)


    1. A01FUV9E01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 5 Fuse

      Remove the IGCT No. 5 fuse from the No. 1 engine room relay block and junction block assembly.

    2. Disconnect the connectors from the power management control ECU.

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

      A01FT4ME02
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly *2 IGCT No. 5 Fuse
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A36-3 (+B1) or 2 (IGCT No. 5 fuse) - Body ground and other terminals Always 10 kΩ or higher
      A35-1 (+B2) or 2 (IGCT No. 5 fuse) - Body ground and other terminals Always 10 kΩ or higher

    4. Install the IGCT No. 5 fuse.

    5. Connect the power management control ECU connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

    REPLACE FUSE (IGCT NO. 5)

  14. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    REPLACE FUSE (IGCT NO. 5)

  15. CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY)


    1. A01FU6XE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 1 Fuse
      *3 IGCT No. 5 Fuse
      *4 IGCT Relay

      Remove the IGCT No. 1 fuse, IGCT No. 5 fuse and IGCT relay from the No. 1 engine room relay block and junction block assembly.

    2. A01FU2IE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 1 Fuse
      *3 IGCT No. 5 Fuse
      *4 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 No. 1 fuse) - Body ground and other terminals Always 10 kΩ or higher
      5 (IGCT relay) or 1 (IGCT No. 5 fuse) - Body ground and other terminals Always 10 kΩ or higher

    3. Install the IGCT No. 1 fuse, IGCT No. 5 fuse and IGCT relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

    REPLACE FUSE (IGCT NO. 1)

  16. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    REPLACE FUSE (IGCT NO. 1)