ZJ Crankshaft position sensor
10-30-2019, 04:08 PM
#1
Newbie
Thread Starter
ZJ Crankshaft position sensor
Greetings,
I have a Grand Cherokee ZJ, with a crankshaft position sensor (PN 56027963) and I was wondering what is the resistance of this particular part?
Thanks in advance.
I have a Grand Cherokee ZJ, with a crankshaft position sensor (PN 56027963) and I was wondering what is the resistance of this particular part?
Thanks in advance.
10-30-2019, 07:02 PM
#2
Banned
Welcome Martetos
I think you may have posted in the wrong section. There is a section for the ZJ. Its the ZJ, WJ, and WK combined section. This section is for the XJ's.
I believe except for maybe the very early model years XJ's, the rest of the years of the XJ all still have the same CPS sensor though either way?
The ZJ crank CPS sensor is a type called a Hall effect sensor. There is no reliably accurate test available to test it for resistance..
Its an on/off signal sensor based off measurements of the magnitude of a magnetic field. It's 5V
You can test it though. Turn the key on and hand crank it to see it provide 5V on/off as you rotate the crank by hand. Or, test it with the engine running to see an average reading. I believe you should see it fluctuating at about 500 milivolts when you do. Its a square wave voltage.
You can test it for ground and for power feed. Ground is less than 100 milivolts with key on, and also less than 100 milivolts with the engine on and running. If you pull the ASD relay, the ground will greatly increase if you test it while you are cranking the engine. It could read up to 200 milivolts You should probably see around 10 milivolts normaly.
The power feed is 5V. It is a shared power feed with the other sensors too, which is good to know. You should see a 5v reading on a DVOM with the key turned on. You should verify that the power feed to the CPS remains at 5V while you are cranking it too, to be extra certain it is a good power feed... If you want to, just pull the ASD relay first to test it while you turn the key to crank it.
Black DVOM lead to a good ground point (neg battery terminal works), and the DVOM red lead to probe the sensor for all the readings.
I think you may have posted in the wrong section. There is a section for the ZJ. Its the ZJ, WJ, and WK combined section. This section is for the XJ's.
I believe except for maybe the very early model years XJ's, the rest of the years of the XJ all still have the same CPS sensor though either way?
The ZJ crank CPS sensor is a type called a Hall effect sensor. There is no reliably accurate test available to test it for resistance..
Its an on/off signal sensor based off measurements of the magnitude of a magnetic field. It's 5V
You can test it though. Turn the key on and hand crank it to see it provide 5V on/off as you rotate the crank by hand. Or, test it with the engine running to see an average reading. I believe you should see it fluctuating at about 500 milivolts when you do. Its a square wave voltage.
You can test it for ground and for power feed. Ground is less than 100 milivolts with key on, and also less than 100 milivolts with the engine on and running. If you pull the ASD relay, the ground will greatly increase if you test it while you are cranking the engine. It could read up to 200 milivolts You should probably see around 10 milivolts normaly.
The power feed is 5V. It is a shared power feed with the other sensors too, which is good to know. You should see a 5v reading on a DVOM with the key turned on. You should verify that the power feed to the CPS remains at 5V while you are cranking it too, to be extra certain it is a good power feed... If you want to, just pull the ASD relay first to test it while you turn the key to crank it.
Black DVOM lead to a good ground point (neg battery terminal works), and the DVOM red lead to probe the sensor for all the readings.
Last edited by Noah911; 10-30-2019 at 07:08 PM.
The following 2 users liked this post by Noah911:
318SixPack (10-30-2019),
Martetos (10-31-2019)
10-31-2019, 06:24 AM
#3
CF Veteran
Also watch out that the throttle cable does not rest on the back of the sensor, this will pull the magnetism away from the direction it needs to be, towards the flywheel ..just my own experience
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