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Home >> Toyota >> 2012 >> Prius V >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System [Diagnostic Codes (P0AA4-232 - U0424-537) & Circuit Tests] >> Hybrid Control System >> Circuit Tests >> ECU Power Source Circuit >> Procedure

ECU Power Source Circuit: Procedure

  1. CHECK POWER MANAGEMENT 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.
      Fig 1: Checking Power Management Control ECU (+B1, +B2 Voltage)
      GTY319296Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A22-5 (+B1) - Body ground Power switch on (IG) 11 to 14 V
      A21-2 (+B2) - Body ground Power switch on (IG) 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Power Management Control ECU)
    3. Turn the power switch off.

    NG → See step   3 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND) 
    1. Disconnect connector L5 and L6 from the power management control ECU.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 2: Checking Harness And Connector (Power Management Control ECU - Body Ground)
      GTY323957Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      L5-5 (E01) - Body ground Always Below 1 Ω
      L5-6 (E1) - Body ground Always Below 1 Ω
      L6-4 (E12) - Body ground Always Below 1 Ω
      L6-5 (E02) - Body ground Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Power Management Control ECU)
    3. Connect the power management control ECU connectors.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   15 

  3. CHECK POWER MANAGEMENT CONTROL ECU (MREL VOLTAGE) 
    1. Turn the power switch on (IG).
    2. Measure the voltage according to the value(s) in the table below.
      Fig 3: Checking Power Management Control ECU (MREL Voltage)
      GTY331118Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A22-6 (MREL) - Body ground Power switch on (IG) 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Power Management Control ECU)

    NG → See step   16 

    OK: Go to next step 

  4. CHECK FUSE (IGCT NO. 2). Refer to  PROCEDURE - Step 2 

    NG → See step   11 

    OK: Go to next step 

  5. CHECK FUSE (IGCT). Refer to  PROCEDURE - Step 4 

    NG → See step   12 

    OK: Go to next step 

  6. INSPECT RELAY (IGCT) 
    1. Remove the IGCT relay from the engine room relay block and junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 4: Inspecting Relay (IGCT)
      GTY318853Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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
      TEXT IN ILLUSTRATION

      *1 IGCT Relay
    3. Install the IGCT relay.

    NG → REPLACE RELAY (IGCT) 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY) 
    1. Remove the IGCT No. 2 fuse from the engine room relay block and junction block assembly.
      Fig 5: Checking Fuse (IGCT No. 2)
      GTY342266Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 2 Fuse
    2. Disconnect connector A21 and A22 from the power management control ECU.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 6: Checking Resistance Of Harness And Connector (Power Management Control ECU - Engine Room Relay Block And Junction Block Assembly)
      GTY326578Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block and Junction Block Assembly *2 IGCT No. 2 Fuse
      *a Rear view of wire harness connector
      (to Power Management Control ECU)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A22-5 (+B1) - 2 (IGCT No. 2 fuse) Always Below 1 Ω
      A21-2 (+B1) - 2 (IGCT No. 2 fuse) Always Below 1 Ω
    4. Install the IGCT No. 2 fuse.
    5. Connect the power management control ECU connectors.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY (IGCT RELAY - IGCT FUSE)) 
    1. Remove the IGCT fuse from the engine room relay block and junction block assembly.
      Fig 7: Checking Fuse (IGCT)
      GTY327610Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT Fuse
    2. Remove the IGCT relay from the engine room relay block and junction block assembly.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 8: Measuring Resistance Of Engine Room Relay Block And Junction Block Assembly (IGCT Relay - IGCT Fuse)
      GTY334398Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 (IGCT relay) - 2 (IGCT fuse) Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT Fuse
      *3 IGCT Relay
    4. Install the IGCT fuse.
    5. Install the IGCT relay.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY) 
    1. Remove the IGCT relay from the engine room relay block and junction block assembly.
    2. Disconnect connector A22 from the power management control ECU.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 9: Checking Harness And Connector (Power Management Control ECU - Engine Room Relay Block And Junction Block Assembly)
      GTY338004Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *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
      A22-6 (MREL) - 1 (IGCT relay) Always Below 1 Ω
      A22-6 (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: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - BODY GROUND) 
    1. Remove the IGCT relay from the engine room relay block and junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 10: Identifying Engine Room Relay Block And Junction Block Assembly & IGCT Relay
      GTY333895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (IGCT relay) - Body ground Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT Relay
    3. Install the IGCT relay.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   17 

  11. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Disconnect connector A59 from the inverter with converter assembly.
    3. Disconnect connector A23 from the transmission control ECU assembly.
    4. Remove the No. 1 hybrid vehicle battery carrier bracket sub-assembly. Refer to REMOVAL - Step 25 .
    5. Disconnect connector c1 from the battery smart unit.
    6. Remove the IGCT No. 2 fuse from the engine room relay block and junction block assembly.
      Fig 11: Checking Fuse (IGCT No. 2)
      GTY342266Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 2 Fuse
    7. Disconnect connector A21 and A22 from the power management control ECU.
    8. Measure the resistance according to the value(s) in the table below.
      Fig 12: Checking Resistance Of Harness And Connector (Power Management Control ECU - Engine Room Relay Block And Junction Block Assembly)
      GTY326578Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block and Junction Block Assembly *2 IGCT No. 2 Fuse
      *a Rear view of wire harness connector
      (to Power Management Control ECU)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A22-5 (+B1) or 2 (IGCT No. 2 fuse) - Body ground and other terminals Always 10 kΩ or higher
      A21-2 (+B1) or 2 (IGCT No. 2 fuse) - Body ground and other terminals Always 10 kΩ or higher
    9. Install the IGCT No. 2 fuse.
    10. Connect the power management control ECU connectors.
    11. Connect the battery smart unit connector.
    12. Install the No. 1 hybrid vehicle battery carrier bracket sub-assembly.
    13. Connect the transmission control ECU assembly connector.
    14. Connect the inverter with converter assembly connector.

    NG → See step   13 

    OK → REPLACE FUSE (IGCT NO. 2) 

  12. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY (IGCT FUSE - IGCT NO. 2 FUSE)) 
    1. Remove the IGCT fuse, IGCT No. 2 fuse, IGCT No. 3 fuse and PCU fuse from the engine room relay block and junction block assembly.
      Fig 13: Checking Engine Room Relay Block And Junction Block Assembly (IGCT Fuse - IGCT No. 2 Fuse)
      GTY335952Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT Fuse
      *3 IGCT No. 3 fuse
      *4 IGCT No. 2 fuse
      *5 PCU Fuse
    2. Remove the IGCT relay from the engine room relay block and junction block assembly.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 14: Measuring Resistance Of Engine Room Relay Block And Junction Block Assembly (IGCT Relay - IGCT Fuse)
      GTY334398Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 (IGCT relay) or 2 (IGCT fuse) - Body ground and other terminals Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT Fuse
      *3 IGCT Relay
    4. Measure the resistance according to the value(s) in the table below.
      Fig 15: Measuring Resistance Of Engine Room Relay Block And Junction Block Assembly (IGCT Relay - IGCT Fuse)
      GTY338530Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      5 (IGCT relay) or 1 (IGCT No. 2 fuse) - Body ground and other terminals Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 2 Fuse
      *3 IGCT Relay
    5. Install the IGCT fuse, IGCT No. 2 fuse, IGCT No. 3 fuse and PCU fuse.
    6. Install the IGCT relay.

    NG → See step   14 

    OK → REPLACE FUSE (IGCT) 

  13. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    NEXT → REPLACE FUSE (IGCT NO. 2) 

  14. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    NEXT → REPLACE FUSE (IGCT) 

  15. GO TO PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  16. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  COMPONENTS 
  17. CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS 
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