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Author Topic: One for the management system experts  (Read 1293 times)

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AndyD_1961

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One for the management system experts
« on: 13 April 2012, 16:45:51 »
Hi
Been looking today for the cause of a 0230 fuel pump primary circuit high on my 3.2 V6.
I have found the wire that operates the fuel pump from the ecu has been cut and
spliced into the ignition controlled 12v feed for the coil packs so  the pump runs all the time while the ignition is on.

The wire from the ecu that is supposed supply the relay with 12v when cranking and running has no power even with the engine running.

So a few questions
1. Would this cause the 0230
2. Could this have been done to bypass a duff crank sensor
3. Does the crank sensor only control the fuel pump relay or does it control the injectors or sparks

I can rebuild an engine no problem but when it comes to management systems i am lost

Thanks
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doz

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Re: One for the management system experts
« Reply #1 on: 13 April 2012, 16:54:24 »
It's not been done because the crank sensor is duff. Crank sensor for spark, cam sensor for injectors. You need to trace the fuel pump wire back to the ECU and check it for breaks. If it's ok then the output on the ECU which controls the pump is knackered. Can't say it wise to run pump from that feed. Purely from the safety angle. If you have a accident it's designed to stop pumping fuel if the engine has stalled. In your current configuration it would still keep pumping if the ignition is switched on.
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AndyD_1961

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Re: One for the management system experts
« Reply #2 on: 13 April 2012, 17:09:36 »
The wire has been cut about 6 inches  from the ecu plug so the that is the only bit that could have breaks
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doz

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Re: One for the management system experts
« Reply #3 on: 13 April 2012, 17:19:53 »
Doesn't sound good for the ECU  :(
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Kevin Wood

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Re: One for the management system experts
« Reply #4 on: 13 April 2012, 18:03:20 »
The ECU connector doesn't supply power to the relay. One side of the relay coil is at 12v, the other side gets pulled down to 0V by the ECU to activate the relay.

I would put the wiring back as standard and take it from there.

Having a constant running fuel pump is not a good idea, as it won't stop in the event of an accident.
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AndyD_1961

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Re: One for the management system experts
« Reply #5 on: 13 April 2012, 19:08:28 »
Just been out with a multimeter and one side of the relay coil is grounded by a brown wire so the cut ecu wire must supply the 12v
the brown wire is original untouched
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