This case study is adapted from an submission sent in by Mechanic.com.au member Ryan McGibbony from Peter Atkin Mechanical.
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In keeping with our video on Diagnostic Monitors last week, it's important to remember to investigate the conditions required for an operation to run and investigate them first before condemning a certain part or system as we will see demonstrated in this article.
After driving for approximately 20km, a fault related to the Diesel Particulate Filter appears on the iDrive Display.
In order for the vehicle to carry out a Diesel Particulate Filter Regeneration, the Engine Coolant Temperature must be higher than 75 Degrees Celcius.
In this instance, the vehicles thermostat had failed causing the engine to run at around 70 Degrees Celcuis Operating Temperature which prevented the Diesel Particulate Filter Regeneration cycle from operating, subsequently causing the error message to be displayed.
A forced Diesel Particulate Filter Regeneration could not be performed due to the insufficient Engine Coolant Temperature.
The faulty thermostat was diagnosed and replaced and was now operating at 89 Degrees Celcius.
The workshop performed a forced Diesel Particulate Filter Regeneration, however due to the fact that the vehicle had travelled 20,000km between Diesel Particulate Filter Regenerations, the exhaust pressure sensor had been blocked/damaged and also required replacement.
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