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6.6 Diesel Particle Filter (DPF) Service
The Diesel Particle Filter (DPF) function manages DPF regeneration, DPF component
replacement teach-in and DPF teach-in after replacing the engine control unit.
The ECM monitors driving style and selects a suitable time to employ regeneration.
Cars driven a lot at idling speed and low load will attempt to regenerate earlier than cars
driven more with higher load and speed. In order for regeneration to take place, a
prolonged high exhaust temperature must be obtained.
In the event of the car being driven in such a way that regeneration is not possible, i.e.,
frequent short journeys, a diagnostic trouble code will eventually be registered in
addition to the DPF light and “Check Engine” indicators displaying. A service
regeneration can be requested in the workshop using the diagnostic tool.
Before performing a forced DPF regeneration using the tool, check the following items:
⚫ The fuel light is not on.
⚫ No DPF-relevant faults are stored in system.
⚫ The vehicle has the specified engine oil.
⚫ The oil for diesel is not contaminated.
IMPORTANT
Before diagnosing a problematic vehicle and attempting to perform an emergency
regeneration, it is important to obtain a full diagnostic log and read out relevant
measured value blocks.
NOTE
1. The DPF will not regenerate if the engine management light is on, or there is a
faulty EGR valve.
2. The ECU must be re-adapted when replacing the DPF and when topping up the
fuel additive Eolys.
3. If the vehicle needs to be driven in order to perform a DPF service, a second
person is needed for the function. One person should drive the vehicle while the
other person observes the screen on the Tool. Do not attempt to drive and observe
the scan tool at the same time. This is dangerous and puts your life and the lives of
other motors and pedestrians at risk.
6.7 Immobilizer (IMMO) Service
An immobilizer is an anti-theft mechanism that prevents an automobile’s engine from
starting unless the correct ignition key or other device is present. This device prevents
thieves from starting the car by a method known as hot wiring. Most new vehicles have
an immobilizer as standard equipment. An important advantage of this system is that it
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