Technical > Wiring & Sensors

pinout questions

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richard s:
i have been advised that for a neater install and a better understanding of the wiring to the ecu that i build my own loom but need help with econoseal plugs
i am using a 4cylinder engine that is going to be converted from k/jet to efi
are the fuel injectors on pins 7/8/19/20
also what are the ignition outputs for on pins 10/11/12/24/33/34/35/36
cheers

Jorgen:
Hi,

The questions you ask is a bit basic, have you read the installation guide found here: http://www.vems.hu/wiki/index.php?page=MembersPage%2FPhatBob%2FUserGuide

It is in no way simple to install an engine management system the first time and if a question like that comes up after reading the manual you may want to talk to a VEMS installer about doing the install. Where are you located?

At the very least you should buy from a certified and experienced VEMS reseller that can give you proper support for the product. Those who buy from the www.vems.hu webshop should primarily use the www.vems.hu Wiki for support.

The 2.3-16 Cosworth Mercedes is also one of the hardest engines to convert, on most engines you can use most of the components but on the Mercedes Cosworth engines you can't use a single component. We have done a large number of installs on these cars here in Gothenburg and we have developed some good solutions.

Jörgen Karlsson
Gothenburg, Sweden.

richard s:
hi jorgen thanks for the reply
i have not read the installation guide as i dont realy get much time on my pc so when i look at the wiki it is realy a quick look but then again i dont look at the members page
i have been on the mercedes 190 forum and this is where i learned about the efi conversion and to be honest it is the wiring and configuration part of the conversion that i am most unsue of
outside of wiring up a couple of alarms and doing the odd wiring repair i have not done any serious wiring this is why i post questions that may seem simple but i am at the learning stage
i am located in sheffield in the uk
thanks again for the link to the user guide and if there is anything else that you can think of that would help me get a better understanding  i would appreciate it
cheers

richard s:
could you tell me if i have the basic jist of it
for tps switch i would need to use pin1 for letting ecu know how open throttle is
pin28 for live feed to switch
and a earth
for injectors pins 7 8 19 20 and flyback lead with diode and a earth
this is not a list of switches etc it is all i can remember without having the pin out diagram in front of me
all its for is for you to tell me if am heading in the right direction
cheers

rob@vems.co.uk:

--- Quote from: richard s on February 14, 2008, 08:56:07 pm ---could you tell me if i have the basic jist of it for tps switch i would need to use pin1 for letting ecu know how open throttle is
pin28 for live feed to switch and a earth
--- End quote ---

Thats about right, the +5V from pin 28 is okay, but we have a TPS specific output on pin29, either will do if you're not looking to power much with the main +5V supply.  The feed to pin1 tells the ECU the position of the throttle, part of the configuration of the system is setting the open and closed limits of the throttle.  And the third pin of the TPS goes to the ground cluster 10-15cm from the VEMS.


--- Quote from: richard s on February 14, 2008, 08:56:07 pm ---for injectors pins 7 8 19 20 and flyback lead with diode and a earth this is not a list of switches etc it is all i can remember without having the pin out diagram in front of me
all its for is for you to tell me if am heading in the right direction
--- End quote ---

The key to remember with VEMS, and almost all other ECUs is that they switch a live feed to ground - so the injectors are fed +12v, but until VEMS closes the circuit the current cant flow, so the injectors do not activate.  This is why we have so many grounds and why they must be connected up in the prescribed manner as a lot of high current devices (injectors, ignition coils, and other solenoids) can be grounding at any time.
The flyback lead from pin23 will have a connected internal to the ECU - if you get a recent box.  The trouble with the UserGuide is that some of the information changes, but you have to cater for the earlier ECUs too!

Cheers

Rob

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