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fuel pump relay circuit problem 200 1983

uid 18083's pic
posted by  lucid on  Fri Jul 15 00:37 CST 2005
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

Guri,

You checked the right terminals, but to detect voltage presence, I always ground one meter or test light connection.

Terminal 30 should always be hot from fuse #7. That's the voltage that the relay passes on to all the FI stuff (Pumps, etc.) when the relay gets "picked".

Terminal 15 should have voltage (from fuse #13) as soon as the Key is turned on. This goes to the plus side of the relay coil, which is already grounded by terminal 31.

BUT the coil does NOT get energized until it "feels" Ignition Pulses at terminal 31b. These pulses come on the White-Red wire from Ignition Coil terminal #1. If they are there when cranking. I think a test light will glow dimly.

(NOTE: Some K-jet relays will "buzz the pumps" for a second at Key ON. But I'm not sure if this is a reliable indication of a good relay.)
--
Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.






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