#Peugeot 407 problems how to#

The fuel correction deviation seemed abnormal and this was the clue for me that started to put the whole problem into perspective. I suppose this could be likened to the short term fuel trim of a petrol engine management system. This seemed to indicate that the engine management system was trying to subtract a significant amount of fuel from its mapped values. Each of these values showed a large negative figure of between -350% and -400%. Whilst browsing through the available live data values looking for clues, I noticed four values relating to injection correction, one for each cylinder. Again this is where a good understanding of system basics and the ability to think laterally is essential. It is even more difficult knowing what values to expect particularly with an unfamiliar vehicle. But with so many different vehicle variants out there, it is a job to know exactly what to look for. To increase engine speed, the system adds fuel to reduce engine speed, the system reduces fuel a healthy diesel engine runs with an abundance of air and uses the heat of compression to produce combustion.Д¬lues to a problem can be gleaned from looking at live data. So what next? To answer this question, consider what makes a diesel engine tick. In this case, my quick health check did indeed show the system to be healthy. The quick health check is also a good way of establishing a healthy common rail diesel fuel system, thereby enabling it to be quickly eliminated as the cause of the problem. Based upon test results, further tests can then be carried out tailored to the system variant(whether it be metering control, two point rail control, with or without electric lift pump in tank etc).

#Peugeot 407 problems how to#

No expensive equipment is required, just a thorough understanding of the system and how to manipulate it to conduct the required test. Knowing what to expect is the key to the test. I have found this health check extremely useful for highlighting a variety of problems from low pressure fuel supply to transfer pump failure and excessive leak back from injectors. The system produces a characteristic pressure waveform which is displayed nicely as a graph. The purpose of the test is to establish what rail pressure the system is capable of producing during engine cranking, at engine idle speed and during a snap acceleration. This test takes just a few minutes using nothing more than the graphing function of a diagnostic scan tool to evaluate fuel rail pressure against engine speed. Due to the nature of the problem, the vehicle had been kept in overnight so that we had a fresh start under the right conditions.ДЄfter checking that the engine oil level was satisfactory, I decided to carry out my quick health check of the fuel system. There were no diagnostic trouble codes stored or pending in the engine ECM and the malfunction indicator lamp (MIL) was not illuminated. The injectors had been sent away to be tested and returned with no fault found. After a couple of minutes, the diesel knock subsided but the smoky exhaust continued. All of its essential components and connections are illustrated by graphic symbols arranged to describe operations as clearly as possible but without regard to the physical form of the various items, components or connections.The symptoms were severe diesel knock when the engine was started from cold and greyish/white smoke from the exhaust. ДЎ991 f150 front axle diagram - Wiring diagram is a technique of describing the configuration of electrical equipment installation, eg electrical installation equipment in the substation on CB, from panel to box CB that covers telecontrol & telesignaling aspect, telemetering, all aspects that require wiring diagram, used to locate interference, New auxillary, etc.ДЎ991 f150 front axle diagram This schematic diagram serves to provide an understanding of the functions and workings of an installation in detail, describing the equipment / installation parts (in symbol form) and the connections.ДЎ991 f150 front axle diagram This circuit diagram shows the overall functioning of a circuit.