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Test TC-187A - EVAP Monitor Pinched Hose

CAUTION: When performing test procedures keep lighted cigarettes, sparks, flames or other ignition sources away from test area. Ensure test area is well ventilated. Ensure fuel tank contains 3-17 gallons of fuel before performing test. Pressurizing fuel tank with less than 3 gallons of fuel may result in an explosion caused by ignition of the fumes. Wear safety glasses when performing test procedures. If vehicle is not being tested on a hoist, ensure parking brake is applied and all wheels are blocked before performing test procedures.
NOTE: For wiring diagram, see WIRING DIAGRAMS - 2.4L article.
  1. Ensure fuel tank contains at least 3 gallons of fuel. Evaporative System Testing Kit (6872A) is used to perform evaporative system pressure test. Perform pressure pump self-test by using instructions on cover of evaporative system testing kit.
  2. Connect evaporative system pressure pump supply hose to EVAP system test port located near EVAP purge solenoid and passenger's side strut tower. See Fig 1.
    Fig 1: Locating EVAP Purge Solenoid & Typical EVAP System Test Port
    G95B35049
  3. Start engine. Go to LDP system test on scan tool and follow displays on scan tool. Set pressure hold to OPEN position and set vent to CLOSED position on evaporative system testing kit. Turn pump timer on. Allow pressure to increase to at least 14 inches.
  4. Remove fuel tank cap while monitoring the pressure. If pressure decreases when fuel tank cap was removed, go to next step. If pressure does not decrease when fuel tank cap was removed, go to step 8).
  5. Reinstall fuel tank cap. Allow pressure to increase to at least 14 inches again.
  6. Disconnect pressure hose from leak detection pump at EVAP canister while monitoring the pressure. This is the hose that fits between leak detection pump and the EVAP canister. See Fig 2 and Fig 3 . The EVAP canister is located on frame rail, directly below driv-er's seat. Leak detection pump is located below driver's side of steering gear, above engine cradle.
  7. If pressure decreases when pressure hose was disconnected, replace leak detection pump. Perform TEST VER-5A. If pressure does not decrease when pressure hose was disconnected, replace EVAP canister. Perform TEST VER-5A.
    Fig 2: Locating EVAP Canister & Identifying Hoses
    G95E35059
    Fig 3: Locating Leak Detection Pump
    G95C35065
  8. Reinstall fuel tank cap. Ensure pressure is at least 14 inches of water vacuum. Disconnect hose for fuel tank vent port at EVAP canister while monitoring the pressure. See Fig 2. This is the hose from EVAP canister to the fuel tank pressure release/rollover valve. Fuel tank pressure release/rollover valve is located on fuel tank filler tube, just below fuel tank cap. The EVAP canister is located on frame rail, directly below driver's seat.
  9. If pressure does not decrease when hose for fuel tank vent port was disconnected, go to next step. If pressure decreases when hose for fuel tank vent port was disconnected, repair restriction in hose for fuel tank vent port from fuel tank pressure release/rollover valve to the EVAP canister. Perform TEST VER-5A.
  10. Disconnect purge vacuum hose at EVAP canister while monitoring the pressure. See Fig 2. If pressure decreases when purge vacuum hose was disconnected, replace EVAP canister. Perform TEST VER-5A. If pressure does not decrease when purge vacuum hose was disconnected, repair restriction in purge vacuum hose from EVAP canister to the EVAP purge solenoid. Perform TEST VER-5A.
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