Pcm voltages.
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Pcm voltages.
I am going to leave out a little of unnecessary details. Can anyone accurately say what the voltage for the crank and cam sensors are. (Logically thinking should be 5vref. And what should the resistance be acros the terminals at the cam plug. I am thinking I am not getting voltage out of pcm to get rpm signal.
Fleet Owner
Joined: Apr 2012
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From: Spanaway
To see the singles you need a scope. They work like a tiny generator.
The proper name is Variable reluctance sensor.
https://en.wikipedia.org/wiki/Variab...uctance_sensor
Here is the quick and dirty.
A variable reluctance sensor (commonly called a VR sensor) is a transducer that, when combined with very basic electronic circuitry, detects the change in presence or proximity of ferrous objects.
The proper name is Variable reluctance sensor.
https://en.wikipedia.org/wiki/Variab...uctance_sensor
Here is the quick and dirty.
A variable reluctance sensor (commonly called a VR sensor) is a transducer that, when combined with very basic electronic circuitry, detects the change in presence or proximity of ferrous objects.
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I am not looking to how to test these sensors. Just need to know for sure if on the 6.0 cam and crank need a 5 volt going to them.? A wiring diagram I found says there is + and - for each sensor with the common twisted wire ground in the loom.
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Have you physically taken a multimeter to the terminals? If it's creating it's own voltage why do you need a "signal" and ground.any hall effect sensor I have seen has some sort input voltage. I need specs according this application not youtube videos.
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Token Redneck
Joined: Jun 2007
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From: Breckenridge, TX
Maybe you should add those unnecessary details to clarify this request. You can go back probe the sensors yourself to get an answer, so what are you trying to get at?
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The issue is no rpm to keep the truck from starting. If these sensors create their own voltage why do they need a "signal" if they have a ground. I am trying to diagnose before throwing unnecessary parts at it. Aka a pcm.
Fleet Owner
Joined: Apr 2012
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From: Spanaway
The signal is the voltage coming from the sensor. It stills needs a return path
and that is why the Ground or - line.
Signal would be the + and the Ground will be the -.
I am not going to really mess you up with proper electrical flow stuff.
The best way to think of this is as an electrical isolated device with 2 wires that carry a signal to
the PCM. The PCM looks at the signal and with some basic components and some software it can
then determine how fast the the cam or crank is moving and with the index tooth that is missing
can tell what degree the two are at any given moment.
The harness to the cm and crank sensors will have a shield foil on them do to the fact that stray
voltage cam be picked up and confuse the PCM. The voltage that the sensor creates will be very
small down in the millivolt range.
Here is a decent video. He talks about both types of sensors.
NOTE Ignore the Vref in this as we are not using it in the two sensors.
We are not using a HALL EFFECT Sensor in this case. You also
have the same type of sensor in the 2 ABS sensors and the one in the rear diff.
and that is why the Ground or - line.
Signal would be the + and the Ground will be the -.
I am not going to really mess you up with proper electrical flow stuff.
The best way to think of this is as an electrical isolated device with 2 wires that carry a signal to
the PCM. The PCM looks at the signal and with some basic components and some software it can
then determine how fast the the cam or crank is moving and with the index tooth that is missing
can tell what degree the two are at any given moment.
The harness to the cm and crank sensors will have a shield foil on them do to the fact that stray
voltage cam be picked up and confuse the PCM. The voltage that the sensor creates will be very
small down in the millivolt range.
Here is a decent video. He talks about both types of sensors.
NOTE Ignore the Vref in this as we are not using it in the two sensors.
We are not using a HALL EFFECT Sensor in this case. You also
have the same type of sensor in the 2 ABS sensors and the one in the rear diff.
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
I will just add that a 6.0 gets it tach (rpm) signal from the crank sensor which is on the passenger side of the block. If you have no crank signal, then you will not have crank/cam sync. If No cam/crank sync, then no Ficm sync so you'll have a NO start.
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