2008 Lexus LS 600hLFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. CONFIRM DTC 
    1. Turn the power switch OFF and wait 10 seconds
    2. Turn the power switch ON (IG)
    3. Turn the power switch OFF and wait 10 seconds
    4. Connect the intelligent tester to the DLC3
    5. Turn the power switch ON (IG) and turn the tester ON.
    6. Enter the following menus.
      1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
      2. Techstream - Select Powertrain / Engine and ECT / Trouble Codes
    7. Confirm the DTCs

      DTC and Malfunction Cross-Reference 

      DTC REFERENCE CHART

      DTC No. Suspected Malfunction
      P043E, P043F, P2401, P2402 and P2419
      • Reference orifice low flow
      • Reference orifice high flow
      • Leak detection pump OFF stuck
      • Leak detection pump ON stuck
      • Vent valve ON (close) stuck
      P2420 Vent valve OFF (vent) stuck
      P0441 Purge VSV close stuck
      P0441 and P1421
      • Gross leak from canister
      • Purge VSV open stuck
      P1420 Small leak from canister
      P1422 Small leak from fuel tank
      P1423 Gross leak from fuel tank
      P1423 and P2450 FVCV open stuck
      P2451 FVCV close stuck
  2. PERFORM EVAP SYSTEM CHECK (AUTO OPERATION) 
    NOTE:
    • In the EVAP SYSTEM CHECK (AUTO OPERATION) Evaporative System Check (Automatic Mode), a series of 9 Evaporative System Check steps are performed automatically. A maximum of 15 minutes is required.
    • Do not perform the EVAP SYS CHECK (Evaporative System Check) when the fuel tank is more than 90% full because the cut-off valve may be closed and the leak check of the fuel tank is unavailable.
    • Do not run the engine.
    • When the temperature of the fuel is 35°C (95°F) or more, a large amount of vapor forms and any check results become inaccurate. When performing an EVAP SYS CHECK (Evaporative System Check), keep the temperature below 35°C (95°F).
    1. Clear the DTC with the intelligent tester or Techstream.
    2. Remove the fuel tank cap and reinstall the fuel cap.
    3. Enter the following menus:
      1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / EVAP SYS CHECK / AUTO OPERATION.
      2. Techstream - Select: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
    4. After the EVAP System Check is completed, check the DTC.

      Result 

      RESULT REFERENCE

      DTC No. Conclusion Proceed to
      Set A malfunction occurs and troubleshooting can be performed A
      Not set No malfunctions occur and it is difficult to perform troubleshooting B
      DTC is not set and any of the current DTCs (P1422, P1423, or P2450) is set DTCs have set because of the fuel cap loosening C

    B:  Go to step  34

    C: END 

    A: Go to next step 

  3. IDENTIFICATION OF TROUBLE AREAS USING DTC 
    1. Refer to the table below to determine the next procedure according to the output DTCs.

      Result 

      RESULT REFERENCE

      DTC No. Suspected Malfunction Proceed to
      P0441, P1420, P1421, P1422, P1423, P2450 and/or P2451
      • Purge VSV open stuck
      • Purge VSV close stuck
      • Gross leak from canister
      • Small leak from canister
      • Gross leak from fuel tank
      • Small leak from fuel tank
      • FVCV open stuck
      • FVCV close stuck
      		 A
      P043E, P043F, P2401, P2402, P2419 and/or P2420
      • Reference orifice low flow
      • Reference orifice high flow
      • Leak detection pump OFF stuck
      • Leak detection pump ON stuck
      • Vent valve ON (close) stuck
      • Vent valve OFF (vent) stuck
      		 B

    B:  Go to step  11

    A: Go to next step 

  4. IDENTIFICATION OF TROUBLE AREAS USING DTC 
    1. Refer to the table below to determine the next procedure according to the output DTCs.

      Result 

      RESULT REFERENCE

      DTC No. Suspected Malfunction Proceed to
      P0441 Purge VSV close stuck A
      P0441 and P1421
      • Gross leak from canister
      • Purge VSV open stuck
      		 B
      P1420 Small leak from canister
      P1422 Small leak from fuel tank C
      P1423 Gross leak from fuel tank
      P1423 and P2450 FVCV open stuck D
      P2451 FVCV close stuck

    B:  Go to step  18

    C:  Go to step  21

    D:  Go to step  23

    A: Go to next step 

  5. CHECK VACUUM HOSE (PURGE VSV - INTAKE MANIFOLD) 
    1. Disconnect the hose (to intake manifold) from the Purge VSV.
    2. Put the engine in inspection mode (see INSPECTION MODE PROCEDURE ).
    3. Use your finger to confirm that the Purge VSV has suction.
      Fig 1: Identifying Purge VSV And Hose (To Intake Manifold)
      G04942953Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT REFERENCE

      Result Proceed to
      There is suction
      Conclusion EVAP hose between Purge VSV and intake manifold is normal      		 OK
      There is no suction
      Conclusion Problem in intake manifold or hose between Purge VSV and intake manifold      		 NG

    NG:  Go to step  33

    OK: Go to next step 

  6. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (PURGE VSV) 
    1. Disconnect the hose (to canister) from the Purge VSV
      2. Fig 2: Identifying Purge VSV And Hose (To Canister)
      G04942951Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Put the engine in inspection mode (see INSPECTION MODE PROCEDURE ).
    3. Enter the following menus:
      1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / EVAP VSV (ALONE)
      2. Techstream - Select. Powertrain / Engine and ECT / Active Test / Activate the VSV for EVAP Control.
    4. Turn the Purge VSV OFF (Purge VSV. OFF).
    5. Use your finger to confirm that the Purge VSV has no suction
    6. Turn the Purge VSV ON (Purge VSV: ON)
    7. Use your finger to confirm that the purge VSV has suction

      OK: Purge VSV functions normally 

    OK:  Go to step  33

    NG: Go to step 7 

  7. CHECK PURGE VSV 
    1. Remove the purge VSV (see REMOVAL ).
      2. Fig 3: Checking Purge VSV
      G05302467Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Apply compressed air to the purge VSV, confirm that no airflows from A to B as shown in the illustration.
    3. Apply battery voltage to the purge VSV.
    4. While applying compressed air, confirm that air flows from A to B as shown in the illustration

      Result 

      RESULT REFERENCE

      Result Proceed to
      Air flows from A to B
      Conclusion purge VSV is normal      		 OK
      No air flows from A to B
      Conclusion purge VSV is malfunctioning      		 NG

    NG:  Go to step  27

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (PURGE VSV - EFI FUSE) 
    1. Disconnect the E44 purge VSV connector.
      2. Fig 4: Identifying Purge VSV Connector Terminals
      G05771141Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the power switch ON (IG)
    3. Measure the voltage according to the value (s) in the table below.

      Result 

      RESULT REFERENCE

      Tester Connection Result Suspected Trouble Area Proceed to
      E44-2 - Body ground 11 to 14 V Conclusion No problem exists on power source's wires OK
      E44-2 - Body ground Except above Conclusion Problem in wire or connector between purge VSV and battery NG

    NG:  Go to step  32

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM) 
    1. Disconnect the E1 ECM connector and the E44 purge VSV connector
    2. Measure the resistance according to the value (s) in the table below

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      E1-17 (PRG) - E44-1 Always 10 Ω or less
      E1-17 (PRG) - Body ground Always 10 kΩ or more
      E44-1 - Body ground Always 10 kΩ or more
      Fig 5: Identifying Purge VSV And ECM Connector Terminals
      G05771142Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  32

    OK: Go to next step 

  10. REPLACE ECM 
    1. Replace the ECM (see REMOVAL  )

    NEXT: PERFORM EVAP SYSTEM CHECK AGAIN (AUTO OPERATION) 

  11. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (VACUUM PUMP) 
    1. Connect the intelligent tester or Techstream to DLC3.
    2. Turn the power switch ON (IG).
    3. Enter the following menus:
      1. Intelligent tester - Select DIAGNOSIS/ ENHANCED OBD II / ACTIVE TEST / VACUUM PUMP
      2. Techstream - Select. Powertrain / Engine and ECT / Active Test / Activate the Vacuum Pump.
    4. Turn the leak detection pump ON with the tester.
    5. Touch the canister pump module and check if the pump is moving.

      OK: Pump operates 

    NG:  Go to step  13

    OK: Go to next step 

  12. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (VENT VALVE) 
    1. Remove the canister lower cover (see REMOVAL ).
    2. Connect the intelligent tester or Techstream to DLC3.
    3. Turn the power switch ON (IG).
    4. Enter the following menus:
      1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VENT VALVE
      2. Techstream - Select. Powertrain / Engine and ECT / Active Test / Activate the VSV for Vent Valve.
    5. Touch the canister pump module, use the tester to turn the vent valve ON and OFF, and check if the vent valve is moving.

      OK: Vent valve vibration can be felt. 

    OK:  Go to step  28

    NG:  Go to step  16

  13. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (VACUUM PUMP) 
    1. Turn the power switch OFF.
    2. Remove the canister lower cover (see REMOVAL ).
    3. Disconnect the canister pump module connector.
      4. Fig 6: Identifying Canister Pump Module Connector Terminals
      G04942962Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Connect the intelligent tester or Techstream to DLC3.
    5. Turn the power switch ON (IG).
    6. Enter the following menus:
      1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VACUUM PUMP.
      2. Techstream - Select. Powertrain / Engine and ECT / Active Test / Activate the Vacuum Pump.
    7. Turn the leak detection pump ON with the tester.
    8. Measure the voltage between MTRB terminal 1 of the canister pump module connector and body ground when the leak detection pump is turned ON and OFF using the tester.

      Standard voltage: 10 to 14 V 

    NG:  Go to step  15

    OK: Go to next step 

  14. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - BODY GROUND) 
    1. Remove the canister lower cover (see REMOVAL ).
    2. Disconnect the canister pump module connector.
      3. Fig 7: Identifying Canister Pump Module Connector Terminals
      G04942963Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance between MGND terminal of the canister pump module and the body ground.

      Standard resistance: Below 1 Ω 

    OK:  Go to step  28

    NG:  Go to step  32

  15. CHECK HARNESS AND CONNECTOR (ECM - CANISTER PUMP MODULE) 
    1. Disconnect the E1 ECM connector.
    2. Disconnect the canister pump module connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      E1-15 (MPMP) - V1-1 (MTRB) Always 10 Ω or less
      E1-15 (MPMP) or V1-1 (MTRB) - Body ground Always 10 kΩ or higher
      Fig 8: Identifying Canister Pump Module And ECM Connector Terminals
      G05771145Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK:  Go to step  26

    NG:  Go to step  32

  16. INSPECT CANISTER PUMP MODULE (VENT VALVE OPERATION) 
    1. Turn the power switch OFF.
    2. Remove the canister lower cover (see REMOVAL ).
    3. Disconnect the canister pump module connector
      4. Fig 9: Identifying Canister Pump Module Connector Terminals
      G05771146Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Apply the battery voltage to VLVB and VGND terminals of the canister pump module
    5. Touch the canister pump module to confirm the vent valve operation

      Result 

      RESULT REFERENCE

      Test Result Suspected Trouble Areas Proceed to
      Operating
      1. Wire harness between vent valve and ECM
      2. ECM
      		 A
      Not operating Vent valve B

    B:  Go to step  28

    A: Go to next step 

  17. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) 
    1. Disconnect the E1 ECM connector.
    2. Disconnect the canister pump module connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      E1-16 (VPMP) - V1-8 (VGND) Always 10 Ω or less
      E1-16 (VPMP) or V1-8 (VGND) - Body ground Always 10 kΩ or higher
      Fig 10: Identifying Canister Pump Module And ECM Connector Terminals
      G05771147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK:  Go to step  26

    NG:  Go to step  32

  18. LOCATE EVAP LEAK PART (PURGE VSV - CANISTER) 
    Fig 11: Identifying EVAP Tester, Canister And Vent Hose
    G05771148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the vent hose
    2. Connect the EVAP tester to the vent hose with the adapter
    3. Pressurize the EVAP system to 3.2 to 3.7 kPa (24 to 28 mmHg).
    4. Apply soapy water to the piping and connecting parts of the EVAP system.
    5. Look for areas where bubbles appear. This indicates the leak point.
    6. Repair or replace the leak point

      HINT:

      Disconnect the hose between the canister and the fuel tank from the canister Block the canister side and conduct an inspection In this way, the fuel tank can be excluded as an area suspected of causing fuel leaks.

  19. REPLACE MALFUNCTIONING PART 

    NEXT: PERFORM EVAP SYSTEM CHECK AGAIN (AUTO OPERATION) 

  20. CHECK FUEL TANK CAP ASSEMBLY 
    1. Check if the fuel cap is tightened until a few "click" sounds are heard.
    2. If you have the EVAP tester, check the fuel cap using the fuel cap adaptor
      1. Install the fuel cap to the fuel cap adaptor, and connect the hose from the EVAP tester's pump.
      2. Pressurize the fuel cap adaptor to between 24 and 28 mmHg or for 45 seconds.
      3. Stop the pump and seal the fuel cap adaptor.
      4. Wait 2 minutes.
      5. Confirm that the pressure is higher than 15 mmHg

        OK: Higher than 15 mmHg 

    NG:  Go to step  31

    OK: Go to next step 

  21. LOCATE EVAP LEAK PART (FUEL VAPOR-CONTAINMENT VALVE - FUEL TANK) 
    Fig 12: Identifying EVAP Tester, Canister And Vent Hose
    G05771148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the vent hose.
    2. Connect the EVAP tester to the vent hose with the adapter.
    3. Connect the intelligent tester or Techstream to DLC3.
    4. Turn the power switch ON (IG).
    5. Enter the following menus:
      1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FVCV.
      2. Techstream - Select: Powertrain / Engine and ECT / Active Test /Activate the Fuel Vapor-Containment Valve.
    6. Turn the Fuel vapor-containment valve ON with the tester.
    7. Pressurize the EVAP system to 3.2 to 3.7 kPa (24 to 28 mmHg).
    8. Apply soapy water to the piping and connecting parts of the EVAP system.
    9. Look for areas where bubbles appear. This indicates the leak point.
    10. Repair or replace the leak point.

      HINT:

      Disconnect the hose between the canister and the fuel tank from the canister. Block the canister side and conduct an inspection. In this way, the fuel tank can be excluded as an area suspected of causing fuel leaks.

  22. REPLACE MALFUNCTIONING PART 

    NEXT: PERFORM EVAP SYSTEM CHECK AGAIN (AUTO OPERATION) 

  23. CHECK FUEL VAPOR-CONTAINMENT VALVE ASSEMBLY (POWER SOURCE CIRCUIT) 
    1. Disconnect the mS1 wire harness to wire harness connector.
    2. Connect the intelligent tester to the DLC3.
    3. Turn the power switch ON (IG).
    4. Enter the following menus:
      1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FVCV.
      2. Techstream - Select: Powertrain / Engine and ECT / Active Test /Activate the Fuel Vapor-Containment Valve.
    5. Turn the fuel vapor-containment valve ON with the tester.
    6. Measure the voltage between terminals 5 and 6 of the mS1 connector

      Standard voltage: 10 to 14 V 

      Fig 13: Identifying Floor Wire Connector Terminals
      G05771150Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK:  Go to step  29

    NG: Go to step 24 

  24. CHECK HARNESS AND CONNECTOR (FUEL VAPOR-CONTAINMENT VALVE - EFI NO. 2 FUSE) 
    1. Disconnect the mS1 wire harness to wire harness connector
    2. Measure the voltage between terminal mS1-6 and the body ground.

      Standard voltage: 10 to 14 V 

    NG:  Go to step  32

    Fig 14: Identifying Floor Wire Connector Terminals
    G05771150Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  25. CHECK HARNESS AND CONNECTOR (FUEL VAPOR-CONTAINMENT VALVE ASSEMBLY - ECM) 
    1. Disconnect the E1 ECM connector.
    2. Disconnect the mS1 wire harness to wire harness connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      E1-8 (CCV2) - mS1-5 Always 10 Ω or less
      E1-8 (CCV2) or mS1-5 - Body ground Always 10 kΩ or more
      Fig 15: Identifying Floor Wire And ECM Connector Terminals
      G05771152Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  32

    OK: Go to next step 

  26. REPLACE ECM 
    1. Replace the ECM (see REMOVAL  ).

    NEXT: PERFORM EVAP SYSTEM CHECK AGAIN (AUTO OPERATION) 

  27. REPLACE PURGE VSV 
    1. Replace the purge VSV (see REMOVAL ).

    NEXT: PERFORM EVAP SYSTEM CHECK AGAIN (AUTO OPERATION) 

  28. REPLACE CANISTER ASSEMBLY 
    1. Replace the canister assembly (see REMOVAL ).
      NOTE: When replacing the canister, check the canister pump module interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the hose from the canister to the fuel tank.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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