19 replies to this topic

[xrocketengineer]

You are correct but apparently it is stated here instead:

 

http://www.minipeopl...3/rovermems.pdf

 

"When the ignition is switched on, a voltage

supply is made to MFU terminal 6/2, and the

ECM briefly earths MFU contact 6/1 at ECM

terminal 20. This energises the fuel pump

relay, and causes the fuel pump relay contacts

to close. Terminal 8/6 is thus connected to

terminal 8/4, and voltage is thereby output

to the fuel pump circuit.  After approximately

one second, the ECM opens the circuit, and

the pump stops.  This brief running of the

fuel pump allows pressure to build within

the fuel pressure lines, and provides for an

easier start. The fuel pump circuit will then

remain open until the engine is cranked

or run. Once the ECM receives a speed

signal from the CAS, the fuel pump winding

will again be energised by the ECM, and

the fuel pump will run until the engine is

stopped."

 

 

Edited by xrocketengineer, 03 June 2015 - 10:02 PM.

[tmsmini]

Thank you for finding that. I knew I read it, just was not sure where.

Terry

[Mart!]

still not getting any!

 

here's a brief recap of what we did:

 

- We ordered the complete wiring for a 1999 mini spi
- We connect the complete  wiring to the motor including all ground, power,  the wiring  in relation with the ignition switch, the cluster, the fuel pump, fuse box and relay needed for the engine to crank and start.
- We put the ignition to the "on" position and we notice the fuel pump running for 3 second, the idle control motor moving.
- We crank the engine and it will start right away but stall after 4-5 second. we tried a couple of times after and it didn’t start at all.
- We made some test and noticed that there was no fuel coming out from the injector but after some test, the fuel pump is running and still no fuel.
- We check for the spark at a plug and there is fire while we crank.
- Something seems to reset or cool down because when we stop trying for a while we’re able to start it again for 4-5 seconds, the fuel injector gives 1-2 second of fuel and stops again, stalling the engine.
- Even if we had spark, we checked the crank sensor signal with a scope and it's ok.
- After looking for a voltage drop on every ground and power to the computer, we then checked the injector signal with a scope and got 2-3 pulse when cranking after leaving the key in the off position for a while, otherwise we get nothing.
- The injector driver and ground is completely controlled by the ECU.
- maybe a driver for the injector is not working properly in the ECU?
- We decided to open the ECU and we found on one transistor some of the welding different (dirty or not well done) . We brought it to an electronic specialist and he said without a doubt that the ECU was refurbished. the fix has been well done and that transistor is in relationship with the pin of the injector. He unfortunately wasn't able to know if the ECU was functioning properly.
- In conclusion, the ECU was not new old stock like it was supposed to be.

before we order another one, is there any way to test the ECU to be sure its the source of our problem?

 

thanks again for your help!

[FlyingScot]

The only way if your not a specialist ECU company is with a code reader, then you can check 1) the sensors and 2) live data.

FS

[xrocketengineer]

I do not know what options or plans you have but my experience was to have mine rebuilt by http://atpelectronics.co.uk/ .  I had a MNE101070 that was draining the battery and an MNE101170 provided by the car seller that I could not use since the car had no alarm (Japanese Mini). They rebuilt the MNE101170 and removed the alarm code so it behaves like the MNE101070.  It has worked with no problems for almost six years. I am still debating if rebuilding the original one or not.