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DTC P1486: EVAP Leak Monitor Pinched Hose Found: Testing

  1. Turn the ignition on. With the DRBIII®, read DTCs. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step  6.
    2. NOTE: To continue testing, a Miller EVAP System Pressure Pump (6872A) and Gas Cap Tester Adapter (8382) is required.
    WARNING: The test equipment is designed to be used to pressurize the vehicles evaporative system only. Using the equipment in a manner for which it was not designed could be harmful. Keep lighted cigarettes, sparks, flames, and other ignition sources away from the test area to prevent the ignition of explosive gases. Keep the test area well ventilated.
  2. The fuel tank should be 20-80 percent of full to properly test the EVAP system. Attach the power source Red clip of Miller EVAP System Pressure Pump to Battery (+) and the ground Black clip to Battery (-). Perform the Evaporative System Pressure Pump self-test that is specified on the tester cover. Remove gas cap and install Gas Cap Tester Adapter on vehicle. Install gas cap to Gas Cap Tester Adapter. Attach the pressure supply hose from Miller EVAP System Pressure Pump to the fitting on Gas Cap Tester Adapter. Disconnect the vacuum supply hose at the Leak Detection Pump. Connect and apply a continuous vacuum supply (i.e., 20 in. Hg) to the Leak Detection Pump. A vacuum pump such as an A/C recovery unit works well. Turn the ignition on. With the DRBIII® in System Tests, select Leak Detect Pump Test. Read instructions and then press Enter. Select: #3 - HOLD PSI. On Miller EVAP System Pressure Pump, set the Pressure/Hold switch to Open and set the Vent switch to Closed. Turn the pump timer On and watch gauge. When the gauge pressure reaches 14 in. H2O, turn the Pressure/Hold Valve to Closed. Turn the pump timer off. Disconnect the hose at the EVAP Canister that goes to the Fuel Tank. Did the pressure drop when the hose was disconnected? If yes, go to next step. If no, repair obstruction in the EVAP system between the EVAP Canister and the fuel tank.
  3. Reconnect all previously disconnected hose(s). Re-pressurize the EVAP System. Using Miller Special Tool (8404), hold down the Remote Smoke/Air Start button and monitor the gauge. The flow meter gauge on the Evaporative Emissions Leak Detector (EELD) reads 0 LPM the EVAP system completely pressurized. Disconnect the LDP Pressure hose at the EVAP Canister. The LDP Pressure hose is the hose that connects the EVAP Canister to the Leak Detection Pump. Did the pressure drop when the hose was disconnected? If yes, go to next step. If no, replace the EVAP Canister.
  4. Reconnect all previously disconnected hose(s). Re-pressurize the EVAP System. Using Miller Special Tool (8404), hold down the Remote Smoke/Air Start button and monitor the gauge. The flow meter gauge on the EELD reads 0 LPM the EVAP system completely pressurized. Disconnect the EVAP hoses at the Purge Solenoid. Did the pressure drop when the hose was disconnected? If yes, go to next step. If no, repair or replace the hose/tube as necessary.
  5. Disconnect and remove the LDP pressure hose. The LDP pressure hose is the hose that connects the EVAP Canister to the Leak Detection Pump. Inspect the LDP pressure hose for any obstructions or physical damage. Is the LDP pressure hose free from defects? If yes, replace the Leak Detection Pump. If no, repair/replace hose as necessary.
  6. At this time, the conditions required to set the DTC are not present. Use the Freeze Frame Data to help you duplicate the conditions that set the DTC. Pay particular attention to the DTC set conditions, such as, VSS, MAP, ECT, and Load. A thorough visual inspection of the EVAP system hoses, tubes, and connections may save time in your diagnosis. Look for any physical damage or signs of wetness at connections. The strong smell of fuel vapors may aid diagnosis also. Refer to any Technical Service Bulletins (TSB) that may apply. With the DRBIII® in System Tests, perform the LDP Monitor Test. This will force the PCM to run the LDP Monitor. If the monitor fails, further diagnosis is required to find faulty component. If the monitor passes, the condition is not present at this time. Were any problems found? If yes, repair as necessary. If no, test is complete.
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