Vehicle

2013 Mitsubishi L200 2.5L Diesel

Title

P1498, Regenerated Diesel Particulate Filter

Complaint

The customer states the check engine light is on, the vehicle is in limp home mode and the diesel particulate filter light is flashing.

Cause

Confirmed customer complaint engine light on. Connected a scan tool and found code P1498 – DPF overloading. At idle, used the scan tool to monitor live data and found the diesel particulate filter pressure sensor signal parameter was not within specification due to component fault or diesel particulate filter blockage. Inspected the diesel particulate filter pressure sensor and found no faults. Used the scan tool to check the diesel particulate filter parameter for soot content and found the level was too high. With the key on, engine off, used a multi-meter to check for the presence of voltage and ground at the diesel particulate filter pressure sensor and found both were present. With the key on, engine off, used the multi-meter to measure the resistance of the diesel particulate filter pressure sensor circuit by disconnecting the control component connector and probed the respective connector terminals. Found the measured resistance was within specifications, which indicated there was continuity through the diesel particulate filter pressure sensor and the diesel particulate filter pressure sensor circuit. Performed a visual inspection of the diesel particulate filter and found no obvious faults. Disconnect the diesel particulate filter pressure sensor pipes and used a vacuum gauge to apply a vacuum to the diesel particulate filter, the results of this test were not within specifications. These test results verified there was a blockage in the diesel particulate filter.

Correction

Regenerated the diesel particulate filter, cleared codes, performed a road test and verified the vehicle operated properly. The check engine light did not illuminate and no fault codes returned.

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A Scan tool revealed code P1206 – Diesel Particulate Filter Efficiency Below Threshold, and after monitoring live data the filter pressure sensor signal revealed erratic parameters. This indicates a potential fault in the sensor or circuitry. Continue reading to discover the multi-meter tests and other procedures used to complete the fix.