P144A - Evaporative Emission System Purge Vapor Line Restricted/Blocked - DTC Chart
P144A - EVAPORATIVE EMISSION SYSTEM PURGE VAPOR LINE RESTRICTED/BLOCKED - DTC CHART
| Description: The PCM monitors the evaporative emission (EVAP) system for a restricted 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 restricted fuel vapor tube is suspected and an intrusive test is carried out in the final phase of the EVAP monitor. This DTC sets when the intrusive test confirms a blockage a counter is incremented and the counter reaches a calibrated number of completions. | |||
Possible Causes:
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| Diagnostic Aids: Check the fuel vapor tube for blockage between the FTP sensor and the fuel tank. | |||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to Pinpoint Test HX . | ||