Help needed with Crank Position Sensor
Are you getting crank position circuit code? I just went thur this on my car, pull the number one plug ground it have someone turn the motor over. If you do not have spark you have the 58x reluctor wheel. LPE sell the coinvertor box that you need to wire along with that you will need to buy the LS3 front timing cover, LS3 timing set with cam sprocket, and new cam position sensor.
Maybe i will try that this weekend but i doubt that is it.
That is definitely a 24X wheel!
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Teching In
Joined: Nov 2010
Posts: 1
Likes: 0
I'm going through the same problem!... So far we have swapped out 2 sensors, 2 pcm's and checked the reluctor to p/up gap. I've gone over the sensor voltages and the only thing that seems incorrect is the cam sensor volts are @ 12.84v where the table shows it should be 5v... The code that keeps coming up is P0103 (crankshaft position sensor performance A)
I clear and it re-appears but not always straight away.
I have been told that a CASE relearn will fix but so far no success...
Can you verify if your cam volts and crank sensor volts are correct? ie 5volts/12volts
Thanks
mike
I clear and it re-appears but not always straight away.
I have been told that a CASE relearn will fix but so far no success...
Can you verify if your cam volts and crank sensor volts are correct? ie 5volts/12volts
Thanks
mike
TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
You need to find someone who has (and knows how to use) an automotive oscilloscope, to look at the CKP and CMP waveforms (referenced to #1 ignition primary/secondary) to see if they are phased correctly and have the correct shape/amplitude.
I'm going through the same problem!... So far we have swapped out 2 sensors, 2 pcm's and checked the reluctor to p/up gap. I've gone over the sensor voltages and the only thing that seems incorrect is the cam sensor volts are @ 12.84v where the table shows it should be 5v... The code that keeps coming up is P0103 (crankshaft position sensor performance A)
I clear and it re-appears but not always straight away.
I have been told that a CASE relearn will fix but so far no success...
Can you verify if your cam volts and crank sensor volts are correct? ie 5volts/12volts
Thanks
mike
I clear and it re-appears but not always straight away.
I have been told that a CASE relearn will fix but so far no success...
Can you verify if your cam volts and crank sensor volts are correct? ie 5volts/12volts
Thanks
mike
i took some readings with my volt meter and wrote down the voltage as soon as i get out of work i will post it up
but i might take it to a shop if they are open tommrow!
TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
Ask the shop to show you their oscilloscope and to show you any crank/cam waveforms they captured from other vehicles...
if they can't do that, or if the waveforms have poor resolution (i.e. you can't measure the time between crank pulses on the waveform), then goto another shop.
if they can't do that, or if the waveforms have poor resolution (i.e. you can't measure the time between crank pulses on the waveform), then goto another shop.
TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
This is what the 24x/1x CKP/CMP waveforms should look like (attached).
This waveform was captured using a Picoscope which is a deep buffer high resolution automotive oscilloscope.
I borrowed this from the Autonerdz forum (I annotated it to show the relationships between the waveforms).
This waveform was captured using a Picoscope which is a deep buffer high resolution automotive oscilloscope.
I borrowed this from the Autonerdz forum (I annotated it to show the relationships between the waveforms).
This is what the 24x/1x CKP/CMP waveforms should look like (attached).
This waveform was captured using a Picoscope which is a deep buffer high resolution automotive oscilloscope.
I borrowed this from the Autonerdz forum (I annotated it to show the relationships between the waveforms).
This waveform was captured using a Picoscope which is a deep buffer high resolution automotive oscilloscope.
I borrowed this from the Autonerdz forum (I annotated it to show the relationships between the waveforms).
Did you ever get this straightened out??
__________________
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!