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test analysis
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Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Wed, 9 Feb 2005 08:33:50 Share Post by Email
In Reply to: Re: starts fine but it won't run, Paul Broeckx, Wed, 9 Feb 2005 06:44:23
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The hazard light trick doesn't test the CPS, at least not directly.

The hot side of the hazard lights fuse is hot all the time. The low side goes through the hazard light switch to the lights. So the hot side of the fuse is a nice place to pick up power any time. The low side of the fuse (load side) is a convienent way to tell if voltage is present. A meter works well, too.

The fuel pump fuse is the last part before the fuel pump. Supplying the fuel pump fuse is the fuel pump relay. The fuel pump relay is controlled by the ECU. The ECU closes the fuel pump relay when power is applied (key on) AND it senses the engine is turning. The way the ECU tells the engine is turning is the CPS.

So jumpering the HOT side of fuse 14 to the fuel pump fuse (22) turns the fuel pump on because you've tied 12 volts from the battery directly to the fuel pump.

The HOT side of fuse 22 should be 12 volts if the ECU commands the fuel pump relay on, and if the fuel pump relay successfully closes. So if you pull out fuses 14 and 22, and connect the HOT side of fuse 22 to the LOAD side of fuse 14, and turn the flashers on, the flashers should flash when the engine is cranked.

It's critical to get the Hot and Load sides of the fuses figured out here.

The best approach to testing the CPS is to actually stick a meter on the CPS signal to the ECU, and see if you get pulses when the engine cranks.

posted by 192.249....

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