DTC P1486: EVAP Leak Monitor Pinched Hose Found: Testing
- Turn ignition on, engine not running. With the DRBIII®, read DTCs. Is the DTC Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step 5.
- Reconnect all previously disconnected hose(s). Re-pressurize the EVAP System. On Miller Special Tool (8404), set the Pressure/Hold switch to Open and set the Vent switch to Closed. Turn the pump timer On and watch the gauge. When the flow meter gauge on the Evaporative Emissions Leak Detector (EELD) reads zero LPM, 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 Leak Detection Pump. Did the pressure drop when the hose was disconnected? If yes, go to next step. If no, replace the EVAP Canister.
- Reconnect all previously disconnected hose(s). Re-pressurize the EVAP System. On Miller Special Tool (8404), set the Pressure/Hold switch to Open and set the Vent switch to Closed. Turn the pump timer On and watch the gauge. When the flow meter gauge on the EELD reads zero LPM, the EVAP system is 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 hose/tube as necessary.
- 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.
- The conditions required to set the DTC are not present at this time. 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.