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DTC P1486: EVAP Leak Monitor Pinched Hose: Testing

NOTE: Replacing PCM will not correct this problem.
  1. Turn ignition on, with engine off. Using scan tool, read DTCs. If GLOBAL GOOD TRIP counter is displayed and displayed count is "0", go to next step. If GLOBAL GOOD TRIP counter is not displayed or displayed count is not "0", 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 have 3-9 gallons of fuel. Evaporative System Testing Kit (6872A) and Fuel Tank Cap Adapter (8382) are used to perform evaporative system pressure test. Perform pressure pump self-test on evaporative system testing kit by using instructions on cover of evaporative system testing kit. Connect scan tool to Data Link Connector (DLC). Using EVAP system testing kit, fuel tank cap adapter and instructions printed on EVAP system testing kit cover, perform EVAP system pressure pump self-test. Start engine. Using scan tool, go to LEAK DETECTION PUMP TEST and instructions on scan tool. Remove fuel tank cap and install fuel tank cap adapter to fuel tank. Install fuel tank cap to fuel tank cap adapter. Connect hose from evaporative system testing kit to fuel tank cap adapter. Connect EVAP system testing kit positive lead to positive battery terminal and negative lead to negative battery terminal. Set EVAP system testing kit PRESSURE/HOLD valve to OPEN. Set VENT valve to CLOSED. Turn pump timer on and monitor gauge on evaporative system testing kit. When gauge reaches 14 in. H2O, disconnect fuel tank-to-EVAP canister vacuum hose (at EVAP canister) while monitoring gauge on evaporative system testing kit. EVAP canister is located on top of fuel tank. See Figure. If pressure decreases when vacuum hose is disconnected, go to next step. If pressure does not decrease when vacuum hose is disconnected, repair obstruction in EVAP system between fuel tank and EVAP canister.
  3. Reconnect vacuum hose to EVAP canister. With engine still running and pump timer turned on, allow evaporative system testing kit to obtain 14 in. H2O of vacuum again. Ensure PRESSURE/HOLD valve on evaporative system testing kit is in OPEN position and VENT valve is in CLOSED position. When gauge reaches 14 in. H2O, disconnect EVAP canister-to-Leak Detection Pump (LDP) vacuum hose (at EVAP canister) while monitoring gauge on evaporative system testing kit. LDP is located on top of fuel tank. See Figure. If pressure decreases when vacuum hose is disconnected, go to next step. If pressure does not decrease when vacuum hose is disconnected, replace EVAP canister.
  4. Reconnect vacuum hose to EVAP canister. With engine still running and pump timer turned on, allow evaporative system testing kit to obtain 14 in. H2O. Ensure PRESSURE/HOLD valve on evaporative system testing kit is in OPEN position and VENT valve is in CLOSED position. Disconnect EVAP purge solenoid-to-EVAP canister vacuum hose (at EVAP canister) while monitoring gauge on evaporative system testing kit. If pressure does not decrease when vacuum hose is disconnected from EVAP canister, repair restriction in hose between EVAP canister and EVAP purge solenoid. If pressure decreases when vacuum hose is disconnected from EVAP canister, go to next step.
  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 for EVAP leak monitor pinched hose found does not exist or is an intermittent problem. Using scan tool, read FREEZE FRAME data while attempting to duplicate the condition that caused DTC to be set. If DTC P1486: EVAP LEAK MONITOR PINCHED HOSE FOUND resets, go to step  2. If DTC P1486: EVAP LEAK MONITOR PINCHED HOSE FOUND does not reset, no problem is indicated at this time. Test is complete.
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