SureTrack Real Fix: Feeling The Pressure

Real Fixes from the SureTrack® expert information resource are documented issues from actual shop repair orders and community discussions. Read on to see how SureTrack can help you correct issues that are not easily diagnosed using OEM information alone. SureTrack is currently available free with the purchase of a current Snap-on® diagnostic software version.

Due to the global pandemic, garages have seen an increase in D.P.F related issues. This SureTrack community member got to the root cause of this issue by first using live data from the scan tool, and then testing the related components with a multimeter for a first time fix. A great result for both the customer and the garage.

Vehicle
2017 Suzuki Swift 1.3L Diesel

Title
P1901, P2003, Replaced Diesel Particulate Filter Pressure Sensor

Complaint
The customer states the check engine light is on.

Cause
Connected a scan tool and found code P1901 – Clogged Diesel Particulate Filter and P2003 – Diesel Particulate Filter Efficiency Below Threshold Bank 2. At idle, used the scan tool to monitor live data and found the diesel particulate filter pressure sensor signal parameter was erratic. Using a lab scope, backprobed the diesel particulate filter pressure sensor signal circuit at the control module and found the signal parameter was erratic, which indicated there was a fault in the sensor or circuitry. Used a multi-meter to check for the presence of a short or open in the diesel particulate filter pressure sensor wiring harness and found there were no shorts or opens present. Disconnected the diesel particulate filter pressure sensor connector, visually inspected the connector and terminals and found no obvious signs of damage. Visually inspected the diesel particulate filter pressure sensor pipe and found no obvious signs of damage. Used the multi-meter to measure the resistance of the diesel particulate filter pressure sensor and found the measured resistance was not within specifications. The results of these tests verified the diesel particulate filter pressure sensor was faulty.

Correction
Replaced the diesel particulate filter pressure sensor, 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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About the Author

Nick Taylor

Nick Taylor is the SureTrack Community Administrator and a Senior Applications Specialist at Mitchell 1 with over 25 years of experience with electronic repair data systems. Nick previously worked in the automotive dismantling and engine rebuilding industries.