[T3] 1970 Fastback FI won't start
Jim Adney
jadney at vwtype3.org
Fri Feb 16 15:34:20 PST 2018
On 16 Feb 2018 at 10:26, William J wrote:
> I've never heard the power relay click . I do hear the fuel pump relay
> always have.
>
> I wouldn't go by hearing clicks .
Listening for the 2 clicks, coming ~1 second apart is a really important
diagnostic tool. If you don't hear both clicks, you know that there's something
basic wrong with the FI system. It gives you a starting point for
troubleshooting.
If you don't hear any clicks, you know that there is either a problem with
power to the brain or the wiring between the brain and the relays.
If you hear the first click but not the second, you know that there's either a
problem IN the brain, or in the wiring to the pump relay, or someone has
bypassed the pump relay.
If you do hear both clicks, you know:
The brain is getting power.
The brain is telling the fuel pump relay to close and open, so at least part of
the brain is working.
If you hear both clicks, but the engine still won't run, you know that you don't
need to check those things.
--
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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