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Test crank sensor - Harley Davidson Motorcycles

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Hi Anonymous, please visit the websites below:
how to test crank position sensor Harley Davidson Forums
HarleyTechTalk

Posted on May 08, 2015

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Posted on Jan 02, 2017

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Crank sensor or coil. Rare instances, could be the ECM or wiring.

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I have no spark at ht lead. how do i test cdi box and crank sensor


Use a multimeter to test for continuity to ground on one of the crank sensors wires. Depending on the bike there should be 2~4 wires coming out of the crank sensor. At least one of these wires should have oscillating continuity (1/0, repetitively) when tested against ground (stick one lead to the frame). To get the oscillation, crank the engine while looking at the multimeter.

I'm not sure exactly how to test the cdi box. You'll still want to use the multimeter, but you will be testing for continuity and resistance on different wires. Check a workshop manual for the exact procedure.

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2003 s10 blazer cranks no start . when I was trying to test the crank sensor signal wire I found 10 volts present with ignition on not cranking. the ground wire has 12.5 with the key off and 12.21 volts...


Will a scan tool communicate with it or on the screen does it say NO COMM ! That's how you test a PCM/ECM . If no comm ,check power an ground's ,that's it .
Why were you messing with the crank sensor ? If the fuel pump primes for two seconds there is nothing wrong with it . When cranking the engine the PCM/ECM will only energize the fuel pump if it see's an input from the crank sensor ! You will not see 12 volts on the crank sensor signal return wire ! Crankshaft Position (CKP) Sensor
The CKP sensor is a three wire sensor based on the magneto resistive principle. A magneto resistive sensor uses two magnetic pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The PCM supplies a 12-volt, low reference, and signal circuit to the CKP sensor. The sensor returns a digital ON/OFF pulse 3 times per crankshaft revolution for the V6 engine, 4 times for the V8 engine. The CKP sensor reads the crankshaft mounted reluctor wheel to identify pairs of cylinders at top dead center (TDC).

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1 Answer

Troubleshoot crank position sensor location


For testing crank sensor,check the help link below:---How to test Crankshaft Position Sensor? http://fordrepairhelp.blogspot.in/2012/03/how-to-test-ford-focus-crankshaft.html
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How to test Crankshaft Position CKP Sensor?

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Crankshaft Position Sensor Operation?

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Replace Camshaft position sensor and Crankshaft Position Sensor? http://technoanswers.blogspot.in/2012/06/2005-dodge-durango-replace-camshaft.html
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GMC Crankshaft Position (CKP) Sensor Replacing? http://schematicsdiagram.blogspot.com/2011/12/gmc-crankshaft-position-ckp-sensor.html

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These details will help.
Thanks.

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Hello it is not easy to use a computer with a 4 year old constantly trying to get your attention.Anyhow i said disconnect your battery wait 5 minutes to reboot the computer i have gone through your situation a dozen times if it doesn't start it should trip your check engine light and you will be able to scan and retrieve keep me posted.John

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Honestly....the only way to properly test the crank sensor is with an ocilliscope. Because it is a magnet that sends the signal off of the spaces with the crank, an ocilliscope is the only proper way to test the sensor.

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connect a test light to the plug on the ignition coil with it disconnected and crank the engine. if the light flashes the crank sensor is ok and you should replace the ignition coil. if it doesnt i would replace the crank sensor.

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If you don't have the van, it will be very difficult to test the Camshaft Position Sensor. Most reliable tests involve cranking the engine with the sensor installed and testing the sensor's output ranges. Most CPS's are magnetic and therefore testable conditions will be most difficult to achieve outside of the vehicle.

However, if you use a voltmeter, you can test if there is any resistance between terminals 2 and 3 (on a three terminal CPS). If the resistance is zero, this will only tell you that it is probably dead, but will not test if it has any other faults.

I hope this helps.

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you will need a volt meter and know the voltage of the crank sensor so you will know if the voltage is good when you read it and try autozone.com for diagrams pictures and step by step instructions or your local library carries manuals for copies also

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