AUTOLOGIC SUPPORTS TECHNICIAN WITH DPF BLOCKAGE

The blockage was on a Ford Mondeo Diesel Engine 2.0 Duratorq TDCi

Autologic’s OEM-Trained Master Technician recently supported a customer with a blocked Diesel Particulate Filter on a Ford Mondeo 2.0 Duratorq TDCi variant, however, the same diagnostic procedure can be applied to the Ford Diesel 1.6 Duratorq TDCi and 2.2 Duratorq TDCi which share the same DPF system.
Using Autologic diagnostic software and extensive product knowledge for Ford, Autologic says it identified the following cause and steps needed to fix the problem.

Issue
The Diesel Particulate Filter (DPF) was blocked and failing regeneration.
The customer indicated that the Malfunction Indicator Lamp (MIL) warning light was shown on the instrument panel cluster, and the car was experiencing restricted performance.

Fault codes presented
• P244C (Exhaust Temperature Too Low for Particulate Filter Regeneration) and/or,
• P26A1 (Exhaust Aftertreatment Glow Plug Circuit/Open)

Cause
The Autologic OEM-Trained Master Technician identified that possible causes were that the vaporiser was physically blocked, or a blown fuse due to a vaporiser component internal short circuit caused by the vaporiser glowplug overheating, or pump failure.

Action
Autologic provided the customer with the following actions to find the fault and make the necessary repairs:
1. Gain access to the vaporiser, connect a vacuum pump (Mityvac) and see if the vaporiser holds a vacuum. If so, then the vaporiser is blocked and will need replacing.
2. If the fuse for the vaporiser glowplug or pump has blown, then test the glowplug resistance (Nominal 1.1 Ohms, if less than 0.8 Ohms or greater than 1.3 Ohms then the vaporizer glow plug is faulty and will need to be replaced).
3. If the value is within spec, then disconnect the fuel line from the pump and place the end of the fuel line in a clean container and run the bleed/prime routine. If the pump is noisy, or does not run, then check the wiring to pump and that the fuel lines are not blocked. Replace pump and bleed as necessary.

Result
After clearing all fault codes and road testing the vehicle, the Malfunction Indicator Lamp (MIL) warning light is no longer displayed on the instrument panel cluster, and the vehicle performance has returned to normal. No fault codes have returned.

For more information, visit www.autologic.com