7 replies to this topic

[nickcx500]

Hi

I have spent the last 6 years restoring my MPI, 1998 and 1 previous owner.

This is the issue I have;

Switch on and fuel pump runs...main relay operates...stepper motor doesn't operate...starter relay doesn't click in but you can make it work by pressing the relay by hand and then car tries to start.

I have replaced the wire red/white from the EMS to C8 on the fuse box and the brown wire EMS to C7 fuse as they were open circuit.

The starter relay tests about the same resistance as the other 3 but there is no live getting to it. There is live to the plug as it comes from fuse C8. I can't see any break in the printed circuit board but I don't have a diagram for it.

Can someone help please?

thanks Nick

 

[Quinlan minor]

I have had a similar sounding problem. Replaced the ignition switch. Problem solved.

Might be worth checking the output from yours.

Edited by Quinlan minor, 28 February 2024 - 05:29 PM.

[mab01uk]

Some of this Car Mechanics article I posted a while back may help.

 

Mini Mpi Diagnostics - Car Mechanics Magazine (PDF files) :-

https://www.theminif...anics-magazine/

 

 

Edited by mab01uk, 28 February 2024 - 07:53 PM.

[nickcx500]

Thanks guys, I will let you know how I get on. cheers Nick

[Deeppockets]

If you haven't already done so you may want to check that the immobiliser is being deactivated. As well as the +ve being switched from the ignition switch (crank), the starter relay is also switched on the -ve  by the ECU. From Rover's Mini Electrical Library (RCL 0424ENG):

 

Engine Immobilisation

The engine is immobilised when the perimetric alarm is set, inhibiting the engine primary

electrical circuits. Immobilisation is removed when the LH handset button is pressed. The

alarm ECU provides an earth on the W/R wire (via the automatic inhibitor switch on the W/

LG wire in the case of vehicles fitted with automatic gearbox) to one side of the starter relay

coil. Since the other side of the coil is receiving battery voltage from fuse C8 the passenger

compartment fuse box on the W/R-W/K wire, the relay is energised. Once this occurs,

battery voltage is switched from link 4 in the engine compartment fuse box on the N wire via

the MEMS relay module to the starter motor on the N/R wire, with an immobilisation signal

being sent to the MEMS ECM on the W/S wire.

Edited by Deeppockets, 02 March 2024 - 04:50 PM.

[viz139]

If the car has been resprayed I would double check the earth beside the expansion bottle. If it is not 100% it throws up lots of problems with the mems system.

[nickcx500]

If I connect an earth wire to one side of the starter relay and turn the key the relays operates. How can I check that the earth, which I believe is supplied by the ECU?

[nickcx500]

All Done! The red/white wire from the EMS to the Alarm ECU was broken between the EMS plug and the multiplug behind the engine. Just need to find out why the fuel isn't coming through.