Question about 2004 Saturn VUE

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No current from crank sensor to ECM

Changed the crank sensor but won't start. Vehicle was sitting for a year and not bring used.

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You don't get current from a crank sensor just signal. been sitting a while smell the gas, smells like varnish u need to drain it and new gas and go from there.

Posted on Apr 30, 2015

Testimonial: "Thanks. I also meant to say that when we checked wiring diagram everything checked out ok. The only thing we saw was little or no voltage at the ECM."

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Hey Bob how's it going ? What engine does it have 2.2 3.5 L ? An how did you test for current ? This is a AC voltage .
The crankshaft position (CKP) sensor is a permanent magnet generator, known as a variable reluctance sensor. The CKP sensor produces an AC voltage of different amplitude and frequency. The frequency depends on the velocity of the crankshaft. The AC voltage output depends on the crankshaft position and the battery voltage. The CKP sensor works in conjunction with a 7X reluctor wheel attached to the crankshaft. The CKP sensor produces seven pulses for each revolution of the crankshaft. The pulse from the 10-degree notch is known as the sync pulse. The sync pulse is used to synchronize the coil firing sequence with the crankshaft position. The CKP sensor is used for ignition timing, the fuel injector timing, misfire diagnostics and tachometer display. The CKP sensor is connected to the ECM by a signal circuit and a low reference circuit.
The best way to test is with a lab scope !
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