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Home >> Lexus >> 2010 >> HS 250h >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control (Diagnostic Codes (P0AA6-526 - U0424-537) & Circuit Tests) >> Hybrid Control System >> EV Drive Mode Switch Circuit >> Procedure

EV Drive Mode Switch Circuit: Procedure

  1. ASK ABOUT VEHICLE CONDITION 
    1. Check if a buzzer sounded and a message was displayed on the multi-information display when attempting to enter EV mode.

      Result

      Result Proceed to
      No buzzer sounded and no message was displayed on multi-information display. A
      A buzzer sounded and a message was displayed on multi-information display. B

      HINT: 

      If a buzzer sounds and a message is displayed on the multi-information display, one or more of the EV mode entry conditions have not been met. Check that all of the EV mode entry conditions have been met before pressing the EV mode switch.

    B → COMPLETED 

    A: Go to next step 

  2. READ VALUE USING TECHSTREAM (BUS CHECK) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: System Select / CAN Bus Check.

      Result

      Result Proceed to
      All of the ECUs and sensors that are currently connected to the CAN communication system are displayed. A
      None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed. B
    4. Turn the power switch off.

    B → See step   10 

    A: Go to next step 

  3. CHECK DTC OUTPUT (ALL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Check for DTCs of all system by following the prompts on the Techstream screen.
      RESULT

      Result Proceed to
      No DTCs are output A
      DTCs are output B
    4. Turn the power switch off.

    B → GO TO DTC CHART DIAGNOSTIC TROUBLE CODE CHART 

    A: Go to next step 

  4. PERFORM ACTIVE TEST USING TECHSTREAM (COMBINATION METER) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (READY).
    3. Enter the following menus: Body Electrical / Combination Meter / Active Test / Indicat. EV Mode.
    4. Perform the "Indicat. EV Mode" Active Test.

      OK

      The EV mode indicator lamp blinks.

    5. Turn the power switch off.

    NG → See step   11 

    OK: Go to next step 

  5. READ VALUE USING TECHSTREAM (EV REQUEST) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Data List / EV request.
    4. Read the value displayed on the Techstream.
      Tester Display Measurement Item/Range Normal Condition
      EV request EV mode switch condition/
      ON or OFF      		 ON: EV switch operated
      OFF: EV switch not operated

      Result

      Result Proceed to
      The Techstream display changes according to the EV mode switch operation. A
      The Techstream display does not change according to the EV mode switch operation. B
    5. Turn the power switch off.

    B → See step   6 

    A → See step   9 

  6. CHECK COMBINATION SWITCH ASSEMBLY (EV SWITCH) 
    1. Remove the combination switch assembly.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 1: Identifying F8 Combination Switch Assembly
      GTY259527Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      F18-8 (S) - F18-3 (E) EV switch operated Below 1 Ω
      F18-8 (S) - F18-3 (E) EV switch not operated 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Component without harness connected
      (Combination Switch Assembly)
    3. Install the combination switch assembly.

    NG → See step   12 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - BODY GROUND) 
    1. Disconnect connector from the combination switch assembly.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 2: Checking Harness And Connector (Combination Switch Assembly - Body Ground)
      GTY262868Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      F18-3 (E) - Body ground Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Combination Switch Assembly)
    3. Connect the combination switch assembly connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - HYBRID VEHICLE CONTROL ECU) 
    1. Disconnect connector A58 from the hybrid vehicle control ECU.
    2. Disconnect connector from the combination switch assembly.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 3: Identifying Check Harness And Connector (Combination Switch Assembly - Hybrid Vehicle Control ECU
      GTY282624Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      A58-36 (EVSW) - F18-8 (S) Always Below 1 Ω
      A58-36 (EVSW) or F18-8 (S) - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
      *2 Front view of wire harness connector
      (to Combination Switch Assembly)
    4. Connect the combination switch assembly connector.
    5. Connect the hybrid vehicle control ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   13 

  9. CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS 
  10. GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING 
  11. REPLACE COMBINATION METER ASSEMBLY. Refer to COMPONENTS 
  12. REPLACE COMBINATION SWITCH ASSEMBLY. Refer to COMPONENTS 
  13. REPLACE HYBRID VEHICLE CONTROL ECU. Refer to COMPONENTS 
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