Evaporative Emission System Purge Vapor Line Restricted/Blocked
Table of contents
- Possible Causes
- How To Fix
- Tech Notes
- Cost To Diagnose
- When is the code detected
- Possible Symptoms
- Description
P144A MERCURY Possible Causes
- Faulty Evaporative Emission System Purge Valve
- Evaporative Emission System Purge Valve harness is open or shorted
- Evaporative Emission System Purge Valve circuit poor electrical connection
- Blocked fuel vapor tube between the Fuel Tank Pressure (FTP) sensor and the fuel tank
How do I fix code P144A MERCURY?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- There is a factory service bulletin for the following Mercury models:
- 2010-2011 Mercury Milan
- 2009-2011 Mercury Mariner
- Mercury Factory Service Bulletin OBDII Code P144A
Cost of diagnosing the P144A MERCURY code
The cost of diagnosing the P144A MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the code detected
If the intrusive test confirms a blockage a counter is incremented and once the counter reaches a calibrated number of completions, the P144A code is set
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P144A MERCURY Description
The Powertrain Control Module (PCM) monitors the Evaporative Emission (EVAP) system for a blocked fuel vapor tube between the Fuel Tank Pressure (FTP) sensor and the fuel tank. During the initial phase of the EVAP monitor, the PCM closes the canister vent and a vacuum develops in the fuel vapor tubes and lines and in the fuel tank. The PCM monitors the FTP sensor to determine the amount of vacuum and how quickly the vacuum increases. The rate at which the vacuum increases is compared to an expected value. If the vacuum increases quicker than expected, a blocked fuel vapor tube is suspected and an intrusive test is carried out in the final phase of the EVAP monitor.