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We have a customer come in with a 2013 BMW 320i 2.0L , they had replaced plugs coils and all 4 injectors but its running on 2 cylinders and throwing codes.
(please see attachment.) l'm lost where to start we tried a new intergrated power supply module that BMW tech said to try but still does the same thing. please help.
Try checking the power feed to the fuel pump at the fuel pump control module. If it is still not there, you will have to check power(s), ground(s) and communication lines to the module. If the vehicle runs, I would assume that the pump has power and ground.
The module is not powering the low pressure fuel pump with key on. Did you check for voltage at the module itself? We are just trying to see if there is a wiring integrity problem. If you don't get voltage at the module, you isolate the circuit and check for a short to ground. If everything checks out, you will have to check power, ground and communication lines to the module. Good luck
we tried to program the new module today the set up used was you setup this box module with power supply built in can;t remember the namew but it was snapon. the guy called back ran the test and said he can't program it , we put the old one back in and he said it tested fine and that there was a wireing issue with the DME
i'm having a hard time with identifix finding what wire on the DME controls power feeds to the injectors and voltage on them pins should be with key on or in crank mode
If we have the same wiring diagram: pins 9,10,11 and 12 (all white wires) at the DME, connector 6B should be power feed to the injectors. You can check voltages on the ones that work to know what to expect on the ones that do not work. Battery voltage should be expected. Have you tried erasing the codes and see which ones that come back?
Are you missing sparks on 3 and 4? If yes, check coil wirings integrity. If everything checks out, swap 3 and 4 with 1 and 2 and see if the misfires move. If you are not missing sparks, swap the injectors.
I replaced two brand new coils in a friend's car. Both of them were bad. You can have bad new parts. The thing is that if you have powers and grounds to the injectors, good compressions, powers, grounds and transistor controls to the coils, you either have bad coils or bad injectors unless you a a vacuum leak affecting the 2 cylinders which would probably get better as engine warms up.. If you have weak drivers in the DME or the DME cannot process some information properly, you can have a bad DME.
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