DTC P144A:00 [MZI-3.7]

id0102d2303000

DTC P144A:00 | Evaporative emission system purge vapor line restrict/blocked
--- | ---
DETECTION CONDITION | • The PCM monitors the 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. If the intrusive test confirms a blockage a counter is incremented and once the counter reaches a calibrated number of completions, the DTC is set.
POSSIBLE CAUSE | • Blocked fuel vapor tube between the FTP sensor and the fuel tank

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | VERIFY RELATED PENDING CODE OR STORED DTCS • Turn the ignition switch off, then to the ON position (engine off). • Verify related PENDING CODE or stored DTCs. • Is the DTC P0453:00 present? | Yes | Go to the appropriate DTC troubleshooting procedures. (See DTC P0453:00 [MZI-3.7].)
No | Go to the next step.
4 | INSPECT FOR BLOCKED FUEL VAPOR TUBE BETWEEN FTP SENSOR AND FUEL TANK • Turn the ignition switch off. • Remove the fuel vapor tube component (See FUEL TANK REMOVAL/INSTALLATION [MZI-3.7].) • Visually inspect the fuel vapor tube for a blockage between the FTP sensor and the connection to the fuel tank. • Visually inspect the connection at the fuel tank for a blockage. • Attempt to manually remove the blockage. • Is the blockage visible and can be removed? | Yes | Remove the blockage, then go to the next step.
No | Replace a fuel vapor tube component, then go to the next step.
5 | VERIFY TROUBLESHOOTING OF DTC P144A:00 HAS BEEN COMPLETED • Verify that all disconnected connectors are reconnected. • Clear the DTC from the PCM memory using the M-MDS. • Perform the OBD DRIVE MODE up to EVAP (Step 6). (See OBD DRIVE MODE [MZI-3.7].) • Is the PENDING CODE for this DTC present? | Yes | Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZI-3.7].) Go to the next step.
No | Go to the next step.
6 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZI-3.7].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7].)
No | Troubleshooting completed.