The Hall Effect Switch is a disc under the rotor in the distributor. It just lifts off, and has three wires attached. It's a very high failure item, but its his pulses that tell the Engine Computer the engine is rotating and to turn on the ASD relay. Since you have spark, the Hall Effect Switch is working as well as the ASD relay.
I can't remember about your car specifically, but many models use a separate fuel pump relay. Some of them are turned on BY the ASD relay. Some of them are turned on along WITH the ASD relay.
I can only find a '92 service manual. I know there are some differences from '91, but I think the fuel system is the same. There are obvious mistakes too but I think I can figure the circuit out. It appears the coils of the ASD and fuel pump relays are in parallel so they should both turn on at the same time.
Since you're already back there by the fuel tank, ground one lead of your voltmeter or the lead of the test light to a good clean part of the body, then use the other probe to measure the voltage on the dark green wire with the black stripe. That's the feed wire for the fuel pump. 12 volts should be there during engine cranking. If you find 0 volts, try grounding at a different spot. A poor ground for the voltmeter or test light could give a false reading and send us down the wrong road.
Let me know what you find there and whether you're using a voltmeter or test light.
Caradiodoc
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Monday, March 8th, 2010 AT 1:22 AM
