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Unable To Communicate

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#1 Chris M

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Posted 10 June 2018 - 12:16 PM

I’ve borrowed a Rover T4 fault code reader & a Mac tools reader. Neither will communicate with my MPI.
With the T4 I have managed to programmed a new remote.
Is there a common issue if there is no communication? Any help would be great.

#2 humph


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Posted 11 June 2018 - 08:08 AM

You sure you've got them plugged into the correct port on the car? There are two sockets, one for the ECU, one for the alarm (green). You need to connect to the white/cream socket which is to the left hand side of the air filter in the area of the relay pack. The green socket is for the alarm. Have had a few garages connect to the wrong one before.

#3 viz139


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Posted 11 June 2018 - 08:25 PM

Spi has two plugs, MPi has only one. 

If your trying to find an actual fault maybe its caused by a bad earth which may also affect the communication with the reader.

#4 Wiggy


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Posted 11 June 2018 - 09:03 PM

Does your Horn work? They share the same fuse.

#5 Chris M

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Posted 12 June 2018 - 11:59 AM

Mines an MPI so has the 1 plug.
Thanks guys I’ll check the horn & earths.
I’ve already cleaned the earths in the engine bay & made no difference.

#6 FlyingScot


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Posted 23 June 2018 - 04:44 AM

The wiring to the MPi plug is awful, likewise the poor job Rover did in creating two different earths on pin 4&5.
Make sure the ignition is on, as MPi keeps the ECU awake making you think it’s on when it’s not.


#7 ukcooper


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Posted 04 July 2018 - 07:44 PM

Flat/low/duff battery

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