Question about 2004 Saturn VUE

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It won't start. No current from crank sensor to ECM. Wiring diagram checks out.

Vehicle sat for a year without use

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  • Saturn Master
  • 14,045 Answers

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 !
Crankshaft position sensor

Posted on May 02, 2015

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Posted on Jan 02, 2017

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Free wiring diagrams here
http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size . Under system click on engine ,then under subsystem click on starting . Click the search button ,then click the blue link .
If you look at the diagram you will see the ignition switch ,when in start it sends B+ voltage to the ECM/PCM or depending on which system or engine to the BCM . When it see's this input it will energize the starter relay located in the under hood fuse box. This happens if the control module in charge see's another input from the PNP- park neutral position sensor and if no anti-theft system problems .
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https://s10.postimg.org/3ufs1il6x/fuel_pump.jpg

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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.

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