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DTC P1486: EVAP Leak Monitor Pinched Hose: Testing

  1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step  6 .
    CAUTION: When performing test procedures, keep lighted cigarettes, sparks, flames and other ignition sources away from test area. 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.
  2. To test EVAP system properly, fuel tank should be 20-80 percent full. Evaporative System Testing Kit (6872A) and Fuel Tank Cap Adapter (8382) are used to perform evaporative system pressure test. Connect EVAP system testing kit positive lead to positive battery terminal and negative lead to negative battery terminal. Perform pressure pump self-test on evaporative system testing kit by using instructions on cover of evaporative system testing kit. Remove gas cap and install fuel tank cap adapter on gas cap. Connect pressure supply hose from EVAP system testing kit to fitting on fuel tank cap adapter. Disconnect vacuum supply hose from LDP. See Figure . Connect a continuous vacuum source (about 20 in. Hg) to LDP. An A/C evacuation unit works well. Turn ignition on. Using scan tool, select LEAK DETECTION PUMP TEST. Read instructions on scan tool, then press ENTER. Select #3 - HOLD PSI. On EVAP system testing kit, set PRESSURE/HOLD switch to OPEN position and set VENT switch to CLOSED position. Turn pump timer on and observe gauge. When gauge pressure reaches 14 in. H2O, turn PRESSURE/HOLD switch to CLOSED position. Turn pump timer off. Disconnect hose from EVAP canister that goes to fuel tank. See Figure . If pressure dropped when hose was disconnected, go to next step. If pressure did not drop when hose was disconnected, repair obstruction in EVAP system between EVAP canister and fuel tank.
  3. Reconnect vacuum hose to EVAP canister. Re-pressurize EVAP system by setting PRESSURE/HOLD switch to OPEN position and VENT switch to CLOSED position. Turn pump timer on and observe gauge. When gauge pressure reaches 14 in. H2O, turn PRESSURE/HOLD switch to CLOSED position. Turn pump timer off. Disconnect LDP-to-EVAP canister hose from EVAP canister. If pressure dropped when hose was disconnected, go to next step. If pressure did not drop when hose was disconnected, replace EVAP canister.
  4. Reconnect LDP-to-EVAP canister hose. Re-pressurize EVAP system by setting PRESSURE/HOLD switch to OPEN position and VENT switch to CLOSED position. Turn pump timer on and observe gauge. When gauge pressure reaches 14 in. H2O, turn PRESSURE/HOLD switch to CLOSED position. Turn pump timer off. Disconnect EVAP hoses from purge solenoid. See Figure . If pressure dropped when hoses were disconnected, go to next step. If pressure did not drop when hoses were disconnected, repair or replace EVAP hose/tube as necessary.
  5. Disconnect and remove LDP pressure hose. LDP pressure hose connects EVAP canister to LDP. Inspect hose for obstructions and physical damage. Replace hose as necessary. If hose is okay, replace LDP.
  6. At this time, conditions required to set this DTC are not present. Using scan tool, read FREEZE FRAME data while attempting to duplicate conditions that caused DTC to be set. Refer to any technical service bulletins that may apply. Using scan tool, select SYSTEM TESTS, then LDP MONITOR TEST. This will force PCM to run LDP monitor. If monitor fails, further diagnosis is required. If monitor passes, test is complete.
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