HYBRID CONTROL SYSTEM ECU Power Source Circuit

DESCRIPTION

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

WIRING DIAGRAM

B006IIUE02

PROCEDURE


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


    1. Turn the power switch on (IG).

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

      B006I3NC82
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU)

      		 - -
      Standard Voltage
      Tester Connection Condition Specified Condition
      A41-11 (+B1) - Body ground Power switch on (IG) 11 to 14 V
      I3-1 (+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 (MREL VOLTAGE) Click here

    OK

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


    1. Disconnect the I2 and I3 hybrid vehicle control ECU connectors.

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

      B006IRRC15
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      I3-3 (E1) - Body ground Always Below 1 Ω
      I2-34 (E12) - Body ground Always Below 1 Ω
      I2-12 (E01) - Body ground Always Below 1 Ω
      I2-11 (E02) - Body ground Always Below 1 Ω
      I2-10 (E03) - Body ground Always Below 1 Ω

    3. Reconnect the I2 and I3 hybrid vehicle control ECU 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 (MREL VOLTAGE)


    1. Turn the power switch on (IG).

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

      B006I3NC83
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU)

      		 - -
      Standard Voltage
      Tester Connection Condition Specified Condition
      A41-5 (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 Click here

    OK

  4. CHECK FUSE (PM IGCT)


    1. B006JABC01
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 PM IGCT Fuse

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

    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 (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - HYBRID VEHICLE CONTROL ECU) Click here

    OK

  5. CHECK FUSE (IGCT SCENE)


    1. B006HH1C01
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 IGCT SCENE Fuse

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

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

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

    3. Install the IGCT SCENE fuse.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - NO. 2 RELAY BLOCK ASSEMBLY) Click here

    OK

  6. INSPECT RELAY (IGCT SCENE)


    1. B006IJNC01
      *1 No. 2 Relay Block Assembly
      *2 IGCT SCENE Relay

      Remove the IGCT SCENE relay from the No. 2 relay block assembly.

    2. B006IH1N68

      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 SCENE relay.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RELAY (IGCT SCENE)

    OK

  7. CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - HYBRID VEHICLE CONTROL ECU)


    1. Disconnect the A41 and I3 hybrid vehicle control ECU connectors.

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

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

      B006IY7C01
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 PM IGCT Fuse
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      PM IGCT fuse terminal 2 - A41-11 (+B1) Always Below 1 Ω
      PM IGCT fuse terminal 2 - I3-1 (+B2) Always Below 1 Ω

    4. Reconnect the A41 and I3 hybrid vehicle control ECU 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. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - NO. 2 RELAY BLOCK ASSEMBLY)


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

    2. Remove the IGCT SCENE relay from the No. 2 relay block assembly.

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

      B006J99C01
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 No. 2 Relay Block Assembly
      *3 IGCT SCENE Fuse *4 IGCT SCENE Relay
      Standard Resistance
      Tester Connection Condition Specified Condition
      IGCT SCENE fuse terminal 2 - IGCT SCENE relay terminal 3 Always Below 1 Ω

    4. Install the IGCT SCENE fuse and IGCT SCENE relay.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (NO. 2 RELAY BLOCK ASSEMBLY - NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY)


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

    2. Remove the IGCT SCENE relay from the No. 2 relay block assembly.

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

      B006IHWC01
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 No. 2 Relay Block Assembly
      *3 PM IGCT Fuse *4 IGCT SCENE Relay
      Standard Resistance
      Tester Connection Condition Specified Condition
      IGCT SCENE relay terminal 5 - PM IGCT fuse terminal 1 Always Below 1 Ω

    4. Install the PM IGCT fuse and IGCT SCENE relay.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the A41 hybrid vehicle control ECU connector.

    2. Remove the IGCT SCENE relay from the No. 2 relay block assembly.

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

      B006I3UC01
      *1 No. 2 Relay Block Assembly *2 IGCT SCENE Relay
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      IGCT SCENE relay terminal 1 - A41-5 (MREL) Always Below 1 Ω
      IGCT SCENE relay terminal 1 - A41-5 (MREL) - Body ground and other terminals Always 10 kΩ or higher

    4. Install the IGCT SCENE relay.

    5. Reconnect the A41 hybrid vehicle control ECU connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (NO. 2 RELAY BLOCK ASSEMBLY - BODY GROUND)


    1. Remove the IGCT SCENE relay from the No. 2 relay block assembly.

    2. B006J0QC01
      *1 No. 2 Relay Block Assembly
      *2 IGCT SCENE Relay

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

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

    3. Install the IGCT SCENE relay.

      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - HYBRID VEHICLE CONTROL ECU)


    1. Disconnect the A41 and I3 hybrid vehicle control ECU connectors.

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

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

      B006IY7C01
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 PM IGCT Fuse
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      PM IGCT fuse terminal 2 or A41-11 (+B1) - Body ground and other terminals Always 10 kΩ or higher
      PM IGCT fuse terminal 2 or I3-1 (+B2) - Body ground and other terminals Always 10 kΩ or higher

    4. Reconnect the A41 and I3 hybrid vehicle control ECU 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

  13. CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - NO. 2 RELAY BLOCK ASSEMBLY)


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

    2. Remove the IGCT SCENE relay from the No. 2 relay block assembly.

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

      B006JAJC01
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 No. 2 Relay Block Assembly
      *3 IGCT SCENE Fuse *4 PM IGCT Fuse
      *5 IGCT SCENE Relay - -
      Standard Resistance:
      Tester Connection Condition Specified Condition
      IGCT SCENE fuse terminal 2 or IGCT SCENE relay terminal 3 - Body ground and other terminals Always 10 kΩ or higher
      IGCT SCENE relay terminal 5 or PM IGCT fuse terminal 1 - Body ground and other terminals Always 10 kΩ or higher

    4. Install the IGCT SCENE fuse, PM IGCT fuse and IGCT SCENE relay.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FUSE (IGCT SCENE)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

  14. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Result
    Proceed to
    NEXT

    NEXT

    REPLACE FUSE (PM IGCT)

  15. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Result
    Proceed to
    NEXT

    NEXT

    REPLACE FUSE (IGCT SCENE)