What sensor controls the injector pulse?

2009 SMART CAR
126,000 MILES • 1.0L • 3 CYL • 2WD • AUTOMATIC
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JULIUS RUTTY
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hi, i have injector pulse for about 5 cranks, then no pulse, turn the key off, then back on has injector pulse, good spray for about 5 cranks. What sensor controls the injector that would cause this?
Aug 21, 2023 at 9:34 AM
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STRAILER
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This would be the crankshaft sensor, but it sounds more like a bad PCM, SAM control unit or main relay. Have you run the codes?

This guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Check out the images (below). Please let us know how it goes.
Aug 21, 2023 at 2:05 PM
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JULIUS RUTTY
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no codes, has spark will run till injectors stop tested crank sensor test good it seems to me if the ECM sprays the injectors for 3 to 4 cranks. why would it quit working don't have a scan tool and can't find what else could cause it with no codes.
Aug 22, 2023 at 4:28 PM
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STRAILER
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It sounds like a fuel pump problem. If you turn the key on without cranking the engine over, can you hear the fuel in the tank run for about 5 seconds?
Aug 24, 2023 at 10:36 AM
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JULIUS RUTTY
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well, hear what i have done so far check for spark ok check for fuel ok check for injector pulse ok check compression 150 per last time the plugs were fouled rechecked number on plug according to online wrong plug also possible stale gas added octane booster oil pressure test does read but low waiting for spark plugs and coils have no information from previous owner will try to keep posting and thanks for all the reply's will post if i figure it out can't find a lot of information online engine cranks and wants to start but won't.
Aug 24, 2023 at 1:02 PM
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STRAILER
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If the spark plugs are fouled that could be the problem, let me know once you get it back together.
Aug 25, 2023 at 11:44 AM