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Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System - Diagnostic Codes (1 Of 6) & Circuit Tests (Hybrid) >> Hybrid Control System >> Circuit Tests >> Ecu Power Source Circuit [11/2016 - ] >> Procedure

Ecu Power Source Circuit [11/2016 - ]: Procedure

  1. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (+B1, +B2 VOLTAGE) 
    1. Turn the power switch on (IG).
    2. Measure the voltage according to the value(s) in the table below.
      GTY701815Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A86-4 (+B1) - Body ground Power switch on (IG) 11 to 14 V
      A85-1 (+B2) - Body ground Power switch on (IG) 11 to 14 V
    3. Turn the power switch off.
      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  3

    Result: 

    OK 

    Go to next step 

  2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - BODY GROUND) 
    1. Disconnect the F136 and F137 hybrid vehicle control ECU assembly connectors.
    2. Measure the resistance according to the value(s) in the table below.
      GTY694679Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      F136-5 (E01) - Body ground Always Below 1 Ω
      F136-6 (E1) - Body ground Always Below 1 Ω
      F137-4 (E12) - Body ground Always Below 1 Ω
      F137-5 (E02) - Body ground Always Below 1 Ω
    3. Reconnect the F136 and F137 hybrid vehicle control ECU assembly connectors.
      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO PROBLEM SYMPTOMS TABLE.  Refer to PROBLEM SYMPTOMS TABLE [11/2016 - ] .

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  3. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (MREL VOLTAGE) 
    1. Turn the power switch on (IG).
    2. Measure the voltage according to the value(s) in the table below.
      GTY734283Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A86-6 (MREL) - Body ground Power switch on (IG) 11 to 14 V
    3. Turn the power switch off.
      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY.  Refer to COMPONENTS [11/2016 - ] .

    Result: 

    OK 

    Go to next step 

  4. CHECK FUSE (PM-IGCT) 
    1. Remove the PM-IGCT fuse from the No. 3 engine room relay block.
      GTY732046Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 PM-IGCT Fuse
    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.
      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  12

    Result: 

    OK 

    Go to next step 

  5. INSPECT RELAY (IGCT) 
    1. Remove the IGCT relay from the No. 3 engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.
      GTY434306Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 IGCT Relay

      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 relay.
      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RELAY (IGCT) 

    Result: 

    OK 

    Go to next step 

  6. CHECK HARNESS AND CONNECTOR (NO. 3 ENGINE ROOM RELAY BLOCK - HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    1. Remove the PM-IGCT fuse from the No. 3 engine room relay block.
      GTY691700Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 PM-IGCT Fuse
    2. Disconnect the A85 and A86 hybrid vehicle control ECU assembly connectors.
    3. Measure the resistance according to the value(s) in the table below.
      GTY720657Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block *2 PM-IGCT Fuse
      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (PM-IGCT fuse) - A86-4 (+B1) Always Below 1 Ω
      2 (PM IGCT fuse) - A85-1 (+B2) Always Below 1 Ω
    4. Reconnect the A85 and A86 hybrid vehicle control ECU assembly connectors.
    5. Install the PM-IGCT fuse.
      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    Go to next step 

  7. CHECK HARNESS AND CONNECTOR (NO. 3 ENGINE ROOM RELAY BLOCK) 
    1. Remove the PM-IGCT fuse and IGCT relay from the No. 3 engine room relay block.
      GTY710472Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 PM-IGCT Fuse
      *3 IGCT Relay
    2. Measure the resistance according to the value(s) in the table below.
      GTY439871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 PM IGCT Fuse
      *3 IGCT Relay

      Standard Resistance

      Tester Connection Condition Specified Condition
      5 (IGCT relay) - 1 (PM-IGCT fuse) Always Below 1 Ω
    3. Install the PM-IGCT fuse and IGCT relay.
      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    Go to next step 

  8. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 3 ENGINE ROOM RELAY BLOCK) 
    1. Disconnect the A86 hybrid vehicle control ECU assembly connector.
    2. Remove the IGCT relay from the No. 3 engine room relay block.
    3. Measure the resistance according to the value(s) in the table below.
      GTY707111Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block *2 IGCT Relay
      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A86-6 (MREL) - 1 (IGCT relay) Always Below 1 Ω
      A86-6 (MREL) or 1 (IGCT relay) - Body ground and other terminals Always 10 kΩ or higher
    4. Install the IGCT relay.
    5. Reconnect the A86 hybrid vehicle control ECU assembly connector.
      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    Go to next step 

  9. CHECK HARNESS AND CONNECTOR (NO. 3 ENGINE ROOM RELAY BLOCK - BODY GROUND) 
    1. Remove the IGCT relay from the No. 3 engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.
      GTY448707Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 IGCT Relay

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (IGCT relay) - Body ground Always Below 1 Ω
    3. Install the IGCT relay.
      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    Go to next step 

  10. CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - NO. 3 ENGINE ROOM RELAY BLOCK) 
    1. Disconnect the No. 2 engine room wire from the AMD terminal (No. 1 engine room relay block and No. 1 junction block assembly side).
      GTY445467Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 AMD Terminal
    2. Remove the IGCT relay from the No. 3 engine room relay block.
    3. Measure the resistance according to the value(s) in the table below.
      GTY424676Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 No. 3 Engine Room Relay Block
      *3 AMD Terminal *4 IGCT Relay

      Standard Resistance

      Tester Connection Condition Specified Condition
      1M-1 (AMD terminal) - 3 (IGCT Relay) Always Below 1 Ω
    4. Install the IGCT Relay.
    5. Reconnect the No. 2 engine room wire.
      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS.  Refer to CHECK FOR INTERMITTENT PROBLEMS [02/2014 - ] .

    Result: 

    NG 

    Go to next step 

  11. CHECK FUSIBLE LINK BLOCK ASSEMBLY (R/B NO. 3) 
    1. Check the fusible link block assembly (R/B NO. 3) in the No. 1 engine room relay block and No. 1 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 No. 1 junction block assembly.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Fusible link block assembly (R/B NO. 3) 1 - 2 Always Below 1 Ω
      GTY448022Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Fusible Link Block Assembly
    4. Install the fusible link block assembly.
      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    REPLACE FUSIBLE LINK BLOCK ASSEMBLY (R/B NO. 3) 

  12. CHECK HARNESS AND CONNECTOR (NO. 3 ENGINE ROOM RELAY BLOCK - HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    1. Remove the PM-IGCT fuse from the No. 3 engine room relay block.
      GTY436902Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 PM-IGCT Fuse
    2. Disconnect the A85 and A86 hybrid vehicle control ECU assembly connectors.
    3. Measure the resistance according to the value(s) in the table below.
      GTY738432Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block *2 PM-IGCT Fuse
      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (PM-IGCT fuse) or A86-4 (+B1) - Body ground and other terminals Always 10 kΩ or higher
      2 (PM-IGCT fuse) or A85-1 (+B2) - Body ground and other terminals Always 10 kΩ or higher
    4. Reconnect the A85 and A86 hybrid vehicle control ECU assembly connectors.
    5. Install the PM-IGCT fuse.
      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FUSE (PM-IGCT) 

    Result: 

    NG 

    Go to next step 

  13. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NEXT 

    REPLACE FUSE (PM-IGCT) 

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