Re: Why my '81 16v won't start? (part 2)

[Night Shadow <soltwede@ucsub.colorado.edu>]

Just a thought, but isn't there a DIFFERENT fuel pump relay used in CIS-E
systems vs CIS?

Eric


On Mon, 31 Jan 2000, Dave Novak wrote:

> >YES!!!!  This is the problem. I would suspect the wire has worn through 
> >somewhere and is shorting out. I'd pull a new wire to replace it. Make sure 
> >that the short is from this wire first though. (i.e. disconnect from both 
> >ends, and then test again for continuity to chassis ground.
> 
> Ok, I took some time yesterday to check this out...
> 
> I get continuity from D15 on the fuse box to T14/4 (at the instrument 
> cluster), meaning signal gets from the fuse box to the instrument cluster 
> (tach), BUT that circuit has NO continuity with chassis ground.
> 
> I now know my problem lies in the fuel pump relay.
> 
> When I turn the ignition on, the fuel pump is supposed to prime. It doesn't. 
> However, if I remove power from coil terminal #15 (which also disconnects 
> power from the CIS-E computers), the fuel pump primes.
> 
> Yeah, really screwed up.
> 
> Now (Brian), correct me if I'm wrong, but don't I have to have terminal 10 
> of the knock box hooked up to the solenoid of the fuel pump relay? I know 
> this is the rev limiter, but in the Jetta Bentley that wire is the only 
> thing grounding the fuel pump relay.
> 
> In the Scirocco CIS system, terminal 1 of the coil goes to both the fuel 
> pump relay and tach, but in the Jetta terminal 1 goes only to the tach, 
> while that knock box terminal 10 goes to the fuel pump relay.
> 
> When I turn the ignition to start, the fuel pump relay does not kick on and 
> give the engine any fuel.
> 
> I'm eyeing that odd problem where the fuel pump relay primes when power is 
> disconnected as a possible culprit.
> 
> This is a mad weird electrical problem, I know.. i just wanna have this 
> licked soon, so maybe I can hit up some VW shows this summer and see what 
> that's all about.
> 
> Thanks for your help, everyone...
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