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DTC P1486: EVAP Leak Monitor Pinched Hose Found: Testing

  1. Turn the ignition on. With the DRBIII(R), 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. WARNING: 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.
    NOTE: The fuel tank should have 20-80 percent of fuel tank capacity to properly test the EVAP system. To continue testing, you will need Miller EVAP Emission Leak Detector (EELD) tool (8404).
  2. Disconnect the vacuum supply hose at the LDP. Connect and apply a continuous vacuum supply of about 20 in. Hg to the LDP. A vacuum pump such as an A/C recovery unit works well. Using the DRBIII(R), select Engine, System Tests and actuate the LDP Test (Option 3/Hold PSI). This energizes the LDP solenoid and allows the constant vacuum source to apply vacuum to the LDP pump diaphragm. This lifts the diaphragm up and seals the atmospheric canister vent valve at the bottom of the LDP. Connect the Red power lead of EELD to the battery positive terminal and the Black ground lead to battery negative terminal. Connect shop air to the EELD. Set the Smoke/Air control switch to Air. Insert the EELD air supply tip (Clear hose) into the appropriate calibration orifice on the EELD control panel (based on DTC leak size). Press the remote Smoke/Air Start button. Position the Red flag on the air flow meter so it is aligned with the indicator ball. When the calibration is complete, release the remote button. The EELD has now calibrated the flow meter in liters per minute to the size leak indicated by the DTC set in the PCM. Install the Service Port Adapter (8404-14) on the vehicle's service port. Connect the Air supply hose from the EELD to the service port. Press the remote button to activate Air flow. Larger volume fuel tanks, and/or those with less fuel, may require 4-5 minutes to fill. The flow meter gauge on the EELD will read zero LPM when the EVAP system is completely pressurized. Disconnect the hose at the EVAP canister that goes to the Fuel Tank. If yes, go to next step. If no, repair the obstruction in the EVAP system between the EVAP canister and the fuel tank.
    3. NOTE: Reconnect all previously disconnected hose(s).
  3. Repressurize the EVAP system. Using the EELD, hold down the remote Smoke/Air Start button and monitor the gauge. The flow meter gauge on the EELD reads zero LPM when the EVAP system is 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 LDP. Did the pressure drop when the hose was disconnected? If yes, go to next step. If no, replace the EVAP canister.
    4. NOTE: Reconnect all previously disconnected hose(s).
  4. Repressurize EVAP system. Using the EELD, hold down the remote Smoke/Air Start button and monitor the gauge. The flow meter gauge on the EELD reads zero LPM when the EVAP system is completely pressurized. Disconnect the EVAP hoses at the purge solenoid. Did pressure dropped when hoses were disconnected. If yes, go to next step. If no, repair or replace EVAP hose/tube as necessary.
    5. NOTE: Reconnect all previously disconnected hose(s).
  5. Disconnect and remove the LDP pressure hose. The LDP pressure hose is the hose that connects the EVAP canister to the LDP. Inspect the LDP pressure hose for any obstructions or physical damage. Is the LDP pressure hose free from defects? If yes, replace the LDP. If no, repair or replace the hose as necessary.
    6. NOTE: Use the Freeze Frame Data to help 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.
  6. Conditions that set DTC are not present at this time. Refer to any Technical Service Bulletin (TSB) that may apply. With the DRBIII(R) 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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