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2001 chevy pick up 2500 8.1 engine

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12 Feb 2019 15:28 - 12 Feb 2019 15:47 #27005 by autojoe
2001 chevy pick up 2500 8.1 engine was created by autojoe
Does anyone know if both cam and crank needed for starting and if crank sensor is pull up or pull down design. It has three wire signal 12 volt feed and ground. I am assuming because it has 12 volt feed that it is a pull up design. What's confusing is that I know it is a hall effect sensor but in alldata is says The Crankshaft Position (CKP) sensor is a magneto resistive type sensor which I have seen on newer vehicles for abs wheel speed sensors which are only two wires. I can't believe that alldata info system says this for 2001. I don't know if newer vehicles are using magneto resistive type sensors for cam and crank sensors.
Last edit: 12 Feb 2019 15:47 by autojoe. Reason: New information added

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12 Feb 2019 18:04 #27010 by Tyler
Replied by Tyler on topic 2001 chevy pick up 2500 8.1 engine

autojoe wrote: What's confusing is that I know it is a hall effect sensor but in alldata is says The Crankshaft Position (CKP) sensor is a magneto resistive type sensor which I have seen on newer vehicles for abs wheel speed sensors which are only two wires. I can't believe that alldata info system says this for 2001. I don't know if newer vehicles are using magneto resistive type sensors for cam and crank sensors.


Sounds like a misprint, IMO. No one that I know of is using magneto resistive sensors for cam or crank signals. You're absolutely right to call BS. ;)

Does anyone know if both cam and crank needed for starting and if crank sensor is pull up or pull down design. It has three wire signal 12 volt feed and ground. I am assuming because it has 12 volt feed that it is a pull up design.


I don't know to a certainty - just don't see many 8.1s around any more. :lol: But if it's anything like the 5.3s and 6.0s, they'll start without the cam sensor. The CKP signal is detailed enough that the PCM can figure it out with a long enough crank time.

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12 Feb 2019 20:09 #27014 by autojoe
Replied by autojoe on topic 2001 chevy pick up 2500 8.1 engine
Thanks Tyler. Do you know if pull up or pull down circuitry?

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13 Feb 2019 07:03 #27016 by juergen.scholl
Replied by juergen.scholl on topic 2001 chevy pick up 2500 8.1 engine

autojoe wrote: Do you know if pull up or pull down circuitry?


Disconnect the sensor and measure voltage on the signal wire coming from the pcm with koeo. Voltage present = pull down. No voltage present = pull up.

An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing.

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13 Feb 2019 08:24 #27017 by autojoe
Replied by autojoe on topic 2001 chevy pick up 2500 8.1 engine
Thanks I know how to determine pull up pull down but there may be a signal wire issue.

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