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

A01I63WE01

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. A01I4SQE49
      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
      A39-3 (+B1) - Body ground Power switch on (IG) 11 to 14 V
      A38-1 (+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 I3 and I4 power management control ECU connectors.

    2. A01I3HDE04
      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
      I3-5 (E01) - Body ground Always Below 1 Ω
      I3-6 (E1) - Body ground Always Below 1 Ω
      I4-4 (E12) - Body ground Always Below 1 Ω
      I4-5 (E02) - Body ground Always Below 1 Ω

    3. Reconnect the I3 and I4 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. A01I4SQE50
      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
      A38-4 (MREL) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  4. CHECK FUSE (PM IGCT)


    1. A01I336E01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 PM IGCT Fuse

      Remove the PM IGCT 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
      PM IGCT fuse terminals Always Below 1 Ω

    3. Install the PM IGCT 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. A01I5T2E01
      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. A01I28XE01
      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. A01I336E01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 PM IGCT Fuse

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

    2. Disconnect the A38 and A39 power management control ECU connector.

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

      A01I340E06
      Text in Illustration
      *1 No. 2 Engine Room Relay Block *2 PM IGCT Fuse
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A39-3 (+B1) - 2 (PM IGCT fuse) Always Below 1 Ω
      A38-1 (+B2) - 2 (PM IGCT fuse) Always Below 1 Ω

    4. Install the PM IGCT fuse.

    5. Reconnect the A38 and A39 power management control ECU connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01I5DQE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 PM IGCT Fuse
      *3 IGCT-MAIN Fuse

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

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

    3. A01I3J4E01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 PM IGCT Fuse
      *3 IGCT Relay
      *4 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
      5 (IGCT relay) - 2 (PM IGCT fuse) Always Below 1 Ω

    4. Install the IGCT-MAIN fuse and PM IGCT 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 A38 power management control ECU connector.

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

      A01I57OE01
      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
      A38-4 (MREL) - 1 (IGCT relay) Always Below 1 Ω
      A38-4 (MREL) or 1 (IGCT relay) - Body ground and other terminals Always 10 kΩ or higher

    4. Install the IGCT relay.

    5. Reconnect the A38 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. A01I48BE01
      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.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

    2. Disconnect AMD terminal from the engine room relay block and junction block assembly.

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

      A01I5JSE01
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly *2 No. 2 Engine Room Relay Block
      *3 IGCT-MAIN Fuse - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      1K-1 (AMD) - 1 (IGCT-MAIN fuse) Always Below 1 Ω

    4. Install the IGCT-MAIN fuse.

    5. Reconnect AMD terminal.


    NG

    CHECK FUSIBLE LINK BLOCK ASSEMBLY (R/B NO. 2) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  12. CHECK FUSIBLE LINK BLOCK ASSEMBLY (R/B NO. 2)


    1. Check the fusible link block assembly (R/B NO. 2) in the 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 engine room relay block and junction block assembly.

    3. A01I4R0E03
      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 1 -2 terminals (R/B NO. 2) Always Below 1 Ω

    4. Install the fusible link block assembly.


    NG

    REPLACE FUSIBLE LINK BLOCK ASSEMBLY (R/B NO. 2)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. A01I336E01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 PM IGCT Fuse

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

    2. Disconnect the A38 and A39 power management control ECU connectors.

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

      A01I340E06
      Text in Illustration
      *1 No. 2 Engine Room Relay Block *2 PM IGCT Fuse
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A39-3 (+B1) or 2 (PM IGCT fuse) - Body ground and other terminals Always 10 kΩ or higher
      A38-1 (+B2) or 2 (PM IGCT fuse) - Body ground and other terminals Always 10 kΩ or higher

    4. Reconnect the A38 and A39 power management control ECU connectors.

    5. Install the PM IGCT fuse.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

    REPLACE FUSE (PM IGCT)

  14. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    REPLACE FUSE (PM IGCT)

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


    1. A01I5DQE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 PM IGCT Fuse
      *3 IGCT-MAIN Fuse

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

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

    3. A01I3J4E01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 PM IGCT Fuse
      *3 IGCT Relay
      *4 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
      5 (IGCT relay) or 2 (PM IGCT fuse) - Body ground and other terminals Always 10 kΩ or higher

    4. Install the IGCT-MAIN fuse and PM IGCT fuse.

    5. Install the IGCT relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

    REPLACE FUSE (IGCT-MAIN)

  16. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    REPLACE FUSE (IGCT-MAIN)