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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0442: Evaporative Emission Control System Leak Detected (Small Leak) Or DTC P0456: Evaporative Emission Control System Leak Detected (Very Small Leak) >> Diagnosis & Repair (Using Hand-Held Tester)

Diagnosis & Repair (Using Hand-Held Tester)

WARNING: This page is about a different car, the 2003 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect the hand-held tester to the DLC3. Select the ENHANCED OBD2/SYSTEM CHECK/EVAP SYS CHECK (or EVAP LEAK TEST) mode on hand-held tester. Perform EVAP SYS CHECK (or EVAP LEAK TEST). If scan tool detects a leak on the fuel tank side or canister side, go to DTC P0441 Or DTC P0446, steps  2 and  24 . If scan tool detects a leak on EVAP system, go to next step.
  2. Check that fuel tank cap is genuine Lexus parts. Replace as necessary. If okay, go to next step.
  3. Check that fuel tank cap is correctly installed. Replace as necessary. If okay, go to next step.
  4. Check fuel tank cap. Replace as necessary. If okay, go to next step.
  5. Check filler neck for damage. Replace as necessary. If okay, go to next step.
  6. Connect the hand-held tester to the DLC3. Select the ACTIVE TEST mode on the hand-held tester. Disconnect the vacuum hose for the VSV for the EVAP from the charcoal canister. Start the engine. Select ACTIVE TEST mode on hand-held tester. When the VSV for the EVAP is operated by the hand-held tester, check whether the disconnected hose applies suction to your finger. See Figure. With VSV ON, disconnected hose applies suction to your finger. With VSV OFF, disconnected hose applies no suction to your finger. If okay, go to step  10. If not okay, go to next step.
  7. Check vacuum hose between intake manifold and VSV for EVAP, and VSV for EVAP and charcoal canister. Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole and damage. Repair as necessary. If okay, go to next step.
  8. Check operation of VSV for EVAP by checking that the air flows with difficulty from ports "E" to "F". Apply battery voltage across the terminals. Check that the air flows without resistance from ports "E" to "F". See Figure and Figure . Replace as necessary. If okay, go to next step.
  9. Check the wire harness between the VSV 2-pin connector for EVAP and ECM connector. Disconnect the V4 VSV 2-pin connector for EVAP. See Figure. Disconnect the E2 ECM connector. Check the continuity between the wire harness side connectors between 2-pin connector terminal No. 1 and ECM E2 connector terminal PRG. Continuity should be present. Ensure no continuity is present between 2-pin connector terminal No. 1 or ECM E2 connector terminal PRG and ECM connector E3 terminal E1. See Figure. Check the wire harness between the VSV for EVAP and EFI relay. Inspect EFI No. 2 fuse. Replace as necessary. Disconnect the V4 VSV 2-pin connector. Remove the EFI relay from the engine room No. 2 relay block. Check continuity between wire harness side of 2-pin connector terminal No. 2 and EFI relay terminal No. 3. If continuity is present, replace ECM. If continuity is not present, repair or replace harness or connector.
  10. Connect the hand-held tester to the DLC3. Disconnect the vacuum hose for the VSV for the CCV from the charcoal canister. Turn the ignition switch ON and push the hand-held tester main switch ON. Select ACTIVE TEST mode on hand-held tester. Check the VSV operation when it is operated by the hand-held tester. When VSV is ON, air does not flow from port "E" to port "F". When VSV is OFF, air from port "E" flows out through port "F". See Figure. If okay, go to step  14. If not okay, go to next step.
  11. Check vacuum hose between VSV for CCV and charcoal canister. Repair as necessary. If okay, go to next step.
  12. Check operation of VSV for CCV by checking that the air flows from ports "A" to "B". See Figure. Apply battery voltage between VSV terminals. Ensure air does not flow from ports "A" to "B". See Figure. If okay, go to next step. If not okay, replace VSV for CCV.
  13. Check the wire harness between the VSV 2-pin connector for CCV and ECM connector. Disconnect the V3 VSV 2-pin connector for EVAP. See Figure. Disconnect the E4 ECM connector. Check the continuity between the wire harness side connectors between 2-pin connector terminal No. 1 and ECM E4 connector terminal CCV. Continuity should be present. Ensure no continuity is present between 2-pin connector terminal No. 1 or ECM E4 connector terminal CCV and ECM connector E3 terminal E1. See Figure. Check the wire harness between the VSV for CCV and EFI relay. Inspect EFI No. 2 fuse. Replace as necessary. Disconnect the V3 VSV 2-pin connector. Remove the EFI relay from the engine room No. 2 relay block. Check continuity between wire harness side of 2-pin connector terminal No. 2 and EFI relay terminal No. 3. If continuity is present, replace ECM. If continuity is not present, repair or replace harness or connector.
  14. Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the ACTIVE TEST mode on the hand-held tester. Check the VSV operation when it is operated by the hand-held tester. If VSV is ON, air from port "E" flows out through port "F". If VSV is OFF, air does not flow from port "E" to port "F". See Figure. If okay, go to step  17. If not okay, go to next step.
  15. Check operation of VSV for pressure switching valve by checking that air flows with difficulty from ports "E" to "F". See Figure. Apply battery positive voltage across the terminals. Check that the air flows from ports "E" to "F". See Figure. Replace as necessary. If okay, go to next step.
  16. Check the wire harness between the VSV 2-pin connector for pressure switching valve ECM connector. Disconnect the V12 VSV 2-pin connector for EVAP. See Figure. Disconnect the E5 ECM connector. Check the continuity between the wire harness side connectors between 2-pin connector terminal No. 1 and ECM E5 connector terminal TBP. See Figure. Continuity should be present. Ensure no continuity is present between 2-pin connector terminal No. 1 or ECM E5 connector terminal TBP and ECM connector E3 terminal E1. Check the wire harness between the VSV for pressure switching valve and EFI relay. Inspect EFI No. 2 fuse. Replace as necessary. Disconnect the V12 VSV 2-pin connector. Remove the EFI relay from the engine room No. 2 relay block. Check continuity between wire harness side of 2-pin connector terminal No. 2 and EFI relay terminal No. 3. If continuity is present, replace ECM. If continuity is not present, repair or replace harness or connector.
  17. Check whether hose close to fuel tank has been modified, and check whether there are signs of any accident near fuel tank. See Figure. Repair as necessary. If okay, go to next step.
  18. Check vacuum hoses between vapor pressure sensor and fuel tank, charcoal canister and VSV for pressure switching valve, and VSV for pressure switching valve and charcoal canister. Repair as necessary. If okay, go to next step.
  19. Check vacuum hoses 4, 5, 7 and 8. See Figure. Repair or replace as necessary. If okay, go to next step.
  20. Check hose and tube between fuel tank and charcoal canister. Check for proper connection of the fuel tank and fuel EVAP pipe, fuel EVAP pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister. Check the hose and tube for cracks, holes and damage. Replace as necessary. If okay, go to next step.
  21. Check charcoal canister assembly for cracks, holes and damage. Replace canister as necessary. If okay, go to next step.
  22. Turn the ignition switch ON. Measure the voltage between terminals VPTK and EPTK of ECM connector E5. See Figure. If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, replace ECM.
  23. Turn the ignition switch ON. Measure the voltage between terminals PTNK and EPTK of ECM connector E5. Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (hand-held vacuum pump), apply a vacuum of 1.18 in. Hg (30 mm Hg) to the vapor pressure sensor. See Figure. Vacuum applied to vapor pressure sensor must be less than 19.7 in. Hg (500 mm Hg). If voltage is 2.9-3.7 volts with vacuum and 0.5 volts or less without vacuum, go to next step. If not, go to step  25.
  24. Disconnect the V11 vapor pressure sensor 3-pin connector. See Figure. Disconnect the E5 ECM connector. Check the continuity between the wire harness side connectors. See VAPOR PRESSURE SENSOR/ECM CONTINUITY CHECK  table. See Figure. If continuity is to specification, replace vapor pressure sensor assembly. If continuity is not to specification, repair or replace harness and connector.
    VAPOR PRESSURE SENSOR/ECM CONTINUITY CHECK

    Terminals No. Specification
    PTNK (V11-2) - PTNK (E5-25) Continuity
    E2 (V11-1) - EPTK (E5-32) Continuity
    VCC (V11-3) - VPTK (E5-27) Continuity
    PTNK (V11-2) Or PTNK (E5-25) - E1 (E3-7) No Continuity
    E2 (V11-1) Or EPTK (E5-32) - E1 (E3-7) No Continuity
    VCC (V11-3) Or VPTK (E5-27) - E1 (E3-7) No Continuity
  25. Check fuel tank over fill check vale assembly for cracks or damage. Replace as necessary. If okay, vehicle owner possibly did not install fuel tank cap correctly.
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