Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Audi A4 2007. 1,8T BFB engine . NO FUEL, NO SPARK, Crank ok.
Engine is same. the enginecode is BFB. replacement engine with all sensors and harness.
I used the original ECU because it is encoded to the cars immobilizer.
Can not connect to ecu OBD2 port. can connect to cars dash computer in car.
don't have tools to test trigger signal.
but I have tried to change the crankshaft sensor and camshaft sensor from the old engine.
Sounds like the harness is not the same...
Disconnect the new harness at the pcm and check if this reestablishes comunicación with the clster/other modules.
An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing.
Please check your fuel pump relay (J17) at pin 3, you must have power from fuse 243. Then check whether you have a PCM controlled ground at pin 5 of the J17, it comes from pin 65 of PCM. You can do these checks using a test light. These checks are on the control side of the relay.
In the event that you do not have the above, you will have to check the PCM powers and grounds.
PCM Grounds Pin 1,2
PCM Powers Pin 62, 3
This is just a quick way of checking, whether you have a computer issue.
Please let me know how it goes.
Hi i have Power on j17 fuel relay on 30 and 86. without relay i read 8v from 85 and same 8v from PCM pin 65.but when i read pin 65 with rely attach it's 0v and the relay is not active.
Please ensure that you have a good battery. Then check the voltage at the fuse, whether it is 12V. If not you have a voltage drop and you must find it.
In relation to Pin 65, that is a computer controlled ground. KOEO you will have 12V, due to the coil on the relay. When you crank the car, the PCM must ground that leg of the circuit.
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