Still learning with these pieces of kit yet. Had a Citreon C3 in today with a customer complaint EML intermittently on. So using SP checked fault codes and found;
P0 204 - Injector Control 2 OC - SC
P0 300 - Random / multiple cylinder misfire detected
P1336 - High combustion misfiring on several cylinders.
Asked customer specifically if any driving conditions were known like loss of power, misfiring etc, customer said no?
So I looked at these codes and asked is it really possible to have a fault on all three circuits?
I decided that I would check the ignition system first using the VP and the flags for the coils operations. The results are shown;
I thought looking at the ignition trace that the number four cylinder was faulty, although i could not notice a misfire. I was also concerned about the number four injector being faulty, or read a code as a fault, so I looked at the wiring diagram which shows that both the injector and the coils share the same power supply. My view at the moment is that the injector is possibly the cause of the fault being seen on the scope with the coils, if for some reason the injector is malfunctioning and the supply voltage is being lost then the coil will also malfunction. I road tested the car and found in my opinion that I thought the car was under powered, but did not misfire. When I spoke to the customer again later, I was advised that a misfire had been noticed
Anyway I advised the customer that given the way the car was running I did not wish to change any parts until I was completely satisfied that a compoent was faulty and contributing to the other circuit. Given Wednesday is a half day for me the car is coming back next week for another play
David
P0 204 - Injector Control 2 OC - SC
P0 300 - Random / multiple cylinder misfire detected
P1336 - High combustion misfiring on several cylinders.
Asked customer specifically if any driving conditions were known like loss of power, misfiring etc, customer said no?
So I looked at these codes and asked is it really possible to have a fault on all three circuits?
I decided that I would check the ignition system first using the VP and the flags for the coils operations. The results are shown;
I thought looking at the ignition trace that the number four cylinder was faulty, although i could not notice a misfire. I was also concerned about the number four injector being faulty, or read a code as a fault, so I looked at the wiring diagram which shows that both the injector and the coils share the same power supply. My view at the moment is that the injector is possibly the cause of the fault being seen on the scope with the coils, if for some reason the injector is malfunctioning and the supply voltage is being lost then the coil will also malfunction. I road tested the car and found in my opinion that I thought the car was under powered, but did not misfire. When I spoke to the customer again later, I was advised that a misfire had been noticed
Anyway I advised the customer that given the way the car was running I did not wish to change any parts until I was completely satisfied that a compoent was faulty and contributing to the other circuit. Given Wednesday is a half day for me the car is coming back next week for another play
David
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