200hp VMAX EFI-- no start

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craigmanns

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Sep 9, 2008
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23
Re: 200hp VMAX EFI-- no start

So far the main thing I know is I am not getting the intial ground path from the ECU, thus pump OOS and the Injectors are not working (presumably no ground from ECU).

Any ides what I should check next?
 
R

rodbolt

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Sep 1, 2003
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Re: 200hp VMAX EFI-- no start

what type of multimeter are you using?
do a forum search on a home made spark tester.
I have never seen an ECU failure on the 3.1L motors.
 
C

craigmanns

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Messages
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Re: 200hp VMAX EFI-- no start

It's a Fluke 83-3 Multimeter. I have a spark tester I bought at Advanced Discount auto. Got spark on all cyl. Just no Petro.
 
R

rodbolt

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Re: 200hp VMAX EFI-- no start

the size thing is the issue I had, at least the later manuals give it in color.
as you have 12V on the pump red wire to ground it indicates the fuel pump fuse and the main relay are turning on.
I looked up the specs on your fluke, move the red lead to the 10A fused hole and the selector to the mA and A position. unplug the pump bullit connector and insert the leads in series with the connector.
the meter will now measure current flow up to 10 amps.
max draw should be less than 6.
if its more than 10 you will now need a replacement fuse for your meter :).
 
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jeffersondodson561

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Re: 200hp VMAX EFI-- no start

Have you checked this connector for proper connection?
click on the image and press ctrl & the + button to make bigger. (ctrl & -) to make smaller.

fuel problem.jpg
 
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rodbolt

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Re: 200hp VMAX EFI-- no start

what is shown is the pump resistor, its the brown wire and blue wire two pin connector.
the brown wire is circut path through the resistor,the blue wire is the resistor bypass circuit. depends on engine speed as to which wire controls the path back to the ECU ground.
you can always unplug the ECU, find the blue pump ground and the brown pump ground pins, test from that pin to the blue bullet conector, blue pin to blue bullit should have less than an ohm,brown pin to blue bullet should have about a .6ohm higher reading.
#10 is the resistor, its under that black ventilated holder with a caution sticker on top of the throttle body.
 
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craigmanns

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Re: 200hp VMAX EFI-- no start

Thanks Gents,
I'll check this this hopefully this eve. I unplugged the connector right at the resistor ant tested blue to brown and got .8 ohms. But from what Rodbolt wrote, I need to recheck with new reference points.
 
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craigmanns

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Re: 200hp VMAX EFI-- no start

Jeff. I got the email thanks...That pic is actually usable. Would you mind sending the picture in post #25?

Thanks again,
CM
 
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craigmanns

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Sep 9, 2008
Messages
23
Re: 200hp VMAX EFI-- no start

Finally got it fixed yesterday. It was the yellow wire between the 10 pin connector and the CDI box that branches in 3 different directions. Could not have got it done without help from Rodbolt and Jeffersondodson. THANK YOU for all the help! You both saved me big bucks that I can now use to catch fish.

Can't thank you guys enough.

CM
 
9

99yam40

Fleet Admiral
Joined
Sep 7, 2008
Messages
9,077
Re: 200hp VMAX EFI-- no start

What did you find?
Broken wire
Corrosion
Unplugged wire
It may help others if you say what your problem was that you found
 
C

craigmanns

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Joined
Sep 9, 2008
Messages
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Re: 200hp VMAX EFI-- no start

All of the above. The wire had see through heat shrink (factory). You could see very little green corrosion though this connection, but it had no continuity using an ohmmeter. tugged it a little and the wires pretty much fell out of the connection. Re terminated with heat shrink butt connectors and elect grease and the pump started running like a champ.
 
R

rodbolt

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Sep 1, 2003
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Re: 200hp VMAX EFI-- no start

and your multi-meter would have told you.
thats also why you had 12V on the red wire with nop load but when the injectors tried to cycle it dropped everything.
always remember voltage is simply a measure of electrical pressure between 2 points.
one strand of that yellow wire is enough to read 12V on an inactive circuit but not enough to allow current flow so the circuit dies.
an example, take your garden hose, place an on off valve at the sprayer end and turn it off. stretch the hose out fully in a straight line.
open the supply valve.
the hose now has full water pressure, well call it 12 PSI(V).
now open the on/off valve, water is now flowing from a source back to ground.
still at 12 PSI.
now close the on off valve, we still have 12 PSI in the hose(wire) no flow,(current)
now close the supply valve. (bad point in the circuit.) open the on/off valve.
see the spurt then nothing.
now close the on/off valve, gently crack open the supply valve about 1/4 turn and wait.
in a bit we now have our 12PSI back in the hose(inactive circuit) now with the supply valve still at 1/4 open, open the on/off valve and attempt to water the lawn.
thats about how simple 12V DC circuits work.
 
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