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Home >> Toyota >> 2020 >> RAV4 LE, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 71 (Hybrid Control System (AWD, W/ Nickel Metal Hydride Battery) - Diagnostic Codes (8 Of 8) & Circuit Tests (1 Of 2)) >> HYBRID CONTROL SYSTEM (for AWD with NICKEL METAL HYDRIDE BATTERY) >> ECU Power Source Circuit [02/2019 - ] >> Procedure

ECU Power Source Circuit [02/2019 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (+B1, +B2 VOLTAGE) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage according to the value(s) in the table below.
      GTY894629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU Assembly)      		 - -

      Standard Voltage

      Tester Connection Condition Specified Condition
      A29-11 (+B1) - Body ground Ignition switch ON 11 to 14 V
      A30-1 (+B2) - Body ground Ignition switch ON 11 to 14 V
    3. Turn the ignition switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  3

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - BODY GROUND) 
    1. Disconnect the A30 and A31 hybrid vehicle control ECU assembly connectors.
    2. Measure the resistance according to the value(s) in the table below.
      GTY858124Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A30-3 (E1) - Body ground Always Below 1 Ω
      A31-12 (E01) - Body ground Always Below 1 Ω
      A31-11 (E02) - Body ground Always Below 1 Ω
      A31-34 (E12) - Body ground Always Below 1 Ω
    3. Reconnect the A30 and A31 hybrid vehicle control ECU assembly connectors.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE [02/2019 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  3. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (MREL VOLTAGE) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage according to the value(s) in the table below.
      GTY938605Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU Assembly)      		 - -

      Standard Voltage

      Tester Connection Condition Specified Condition
      A29-5 (MREL) - Body ground Ignition switch ON 11 to 14 V
    3. Turn the Ignition switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY 

    Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

    Result: 

    OK 

    See step  4

  4. CHECK FUSE (IGCT NO. 2) 
    1. Remove the IGCT NO. 2 fuse from the No. 3 relay block and junction block assembly.
      GTY895196Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly
      *2 IGCT NO. 2 Fuse
    2. 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.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  11

    Result: 

    OK 

    See step  5

  5. CHECK FUSE (IGCT) 
    1. Remove the IGCT fuse from the No. 3 relay block and junction block assembly.
      GTY944312Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly
      *2 IGCT Fuse
    2. 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.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  12

    Result: 

    OK 

    See step  6

  6. INSPECT RELAY (IGCT) 
    1. Remove the IGCT relay from the No. 3 relay block and junction block assembly.
      GTY847654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly
      *2 IGCT Relay
    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.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RELAY (IGCT) 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    1. Disconnect the A29 and A30 hybrid vehicle control ECU assembly connectors.
    2. Remove the IGCT NO. 2 fuse from the No. 3 relay block and junction block assembly.
    3. Measure the resistance according to the value(s) in the table below.
      GTY940268Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly *2 IGCT NO. 2 Fuse
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A29-11 (+B1) - 2 (IGCT NO. 2 fuse terminal) Always Below 1 Ω
      A30-1 (+B2) - 2 (IGCT NO. 2 fuse terminal) Always Below 1 Ω
    4. Reconnect the A29 and A30 hybrid vehicle control ECU assembly connectors.
    5. Install the IGCT NO. 2 fuse.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the IGCT fuse, IGCT NO. 2 fuse and IGCT relay from the No. 3 relay block and junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.
      GTY906992Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly *2 IGCT NO. 2 Fuse
      *3 IGCT Relay *4 IGCT Fuse

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 (IGCT relay) - 2 (IGCT fuse terminal) Always Below 1 Ω
      5 (IGCT relay) - 1 (IGCT NO. 2 fuse terminal) Always Below 1 Ω
    3. Install the IGCT fuse, IGCT NO. 2 fuse and IGCT relay.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FUSE HOLDER 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 3 RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the A29 hybrid vehicle control ECU assembly connector.
    2. Remove the IGCT relay from the No. 3 relay block and junction block assembly.
    3. Measure the resistance according to the value(s) in the table below.
      GTY943112Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly *2 IGCT Relay
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A29-5 (MREL) - 1 (IGCT relay) Always Below 1 Ω
      A29-5 (MREL) or 1 (IGCT relay) - Body ground and other terminals Always 10 kΩ or higher
    4. Install the IGCT relay.
    5. Reconnect the A29 hybrid vehicle control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - BODY GROUND) 
    1. Remove the IGCT relay from the No. 3 relay block and junction block assembly
    2. Measure the resistance according to the value(s) in the table below.
      GTY944223Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly
      *2 IGCT Relay

      Standard Resistance

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

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS 

    Refer to CHECK FOR INTERMITTENT PROBLEMS [02/2019 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    1. Remove the IGCT NO. 2 fuse from the No. 3 relay block and junction block assembly.
    2. Disconnect the A29 and A30 hybrid vehicle control ECU assembly connectors.
    3. Measure the resistance according to the value(s) in the table below.
      GTY940268Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly *2 IGCT No. 2 Fuse
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A29-11 (+B1) or 2 (IGCT No. 2 fuse terminal) - Body ground and other terminals Always 10 kΩ or higher
      A30-1 (+B2) or 2 (IGCT No. 2 fuse terminal) - Body ground and other terminals Always 10 kΩ or higher
    4. Reconnect the A29 and A30 hybrid vehicle control ECU assembly connectors.
    5. Install the IGCT No. 2 fuse.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FUSE (IGCT NO. 2) 

    Result: 

    NG 

    See step  13

  12. CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the IGCT fuse, IGCT NO. 2 fuse and IGCT relay from the No. 3 relay block and junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.
      GTY906992Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Relay Block and Junction Block Assembly *2 IGCT NO. 2 Fuse
      *3 IGCT Relay *4 IGCT Fuse

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 (IGCT relay) or 2 (IGCT fuse terminal) - Body ground and other terminals Always 10 kΩ or higher
      5 (IGCT relay) or 1 (IGCT No. 2 fuse terminal) - Body ground and other terminals Always 10 kΩ or higher
    3. Install the IGCT fuse, IGCT NO. 2 fuse and IGCT relay.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FUSE (IGCT) 

    Result: 

    NG 

    See step  14

  13. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE FUSE (IGCT NO. 2) 

  14. REPLACE FUSE HOLDER 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE FUSE (IGCT) 

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