efi connection people won't start throwing code
05-13-2012, 05:45 AM
#22
TECH Regular
Join Date: Jan 2005
Posts: 456
Likes: 0
Received 0 Likes
on
0 Posts
Oh my...I need to straighten out this thread.
This DTC ("code") is typical. It is an idicator that the PCM is either new or has a new flash (calibration). CASE (crank learn) is data the PCM acquires related to crank reluctor/sensor variation. It's a learning procedure that, if the PCM has lost because of a reflash, must be performed by a GM Tech2 scan tool or other tool capable of initiating the procedure (like EFILive). It is used for misfire detection only. It is unrelated to an engine not running. You may experience some who say, "My engine is not running quite right yet...it needs a crank learn." No, it doesn't, because the PCM will always fire injectors/coils based on the 24x waveform coming from the crank (and the 1x waveform from the cam).
No, you won't be able to perform a crank learn procedure while cranking the engine. Part of the procedure requires normal operating coolant temp and the ability to achieve about 4500 rpm.
The two ways to check for a crank signal are by observing RPMs with a scan tool and by watching the crank sensor signal with an oscilloscope. You can have a bad crank signal and still register RPMs with a scan tool. There is no PID (data to monitor) for the crank sensor.
The two ways to check for a cam signal are by observing the Cam Counts High to Low and Cam Counts Low to High PIDs and by watching the cam sensor signal with an oscilloscope. The cam count PIDs should increment one after the other without missing a digit.
The learn producedure takes only a few seconds to do. Your scan tool must be capable of doing it (Tech2, SnapOn, EFILive). No, a $50.00 scan tool cannot perform crank learn. No, an AutoZone scan tool cannot perform crank learn.
You cannot change the firing order in the PCM.
The car will fire without the cam signal. However, it may assume the wrong stroke.
You cannot change the firing order in the PCM.
No, I said that there are varying thicknesses of aftermarket crankshaft timing sprockets. I did not say that aftermarket cranks are all different.
No, I said that the reluctor is just forward of center of the hole. That is where the sensor gets its signal.
car is throwing a code 1336 crank relearn. Does anyone know what this is or why?
the only time i have ever done relarns is with the car firing. but you might be able to do it while cranking the bitch for a while
how would we know if we have crank and cam signals?
The two ways to check for a cam signal are by observing the Cam Counts High to Low and Cam Counts Low to High PIDs and by watching the cam sensor signal with an oscilloscope. The cam count PIDs should increment one after the other without missing a digit.
at work i have a snap on soltice. but you hit relearn on the scanner and bring the rpm up for 30 sec or something
how did you switch the firing order? in the harness or pcm
you need the crank and cam single to get a injector pulse and coil pulse. if you dont have them the car will not fire
the firing order from a ls and lt are diffrent you eather have to change it in the harness or ecu
on my 24x swap i had to get the lower timming sprocket thayed down to get a crank single. i called efi and they said aftermarket cranks are all diffrent...
...and to make sure the wheel is right in the middle of the sensor hole
05-13-2012, 05:49 AM
#23
TECH Regular
Join Date: Jan 2005
Posts: 456
Likes: 0
Received 0 Likes
on
0 Posts
The 24x conversion was designed using a stock engine. We used a 1994 LT1. More often than not, when someone has a problem with no start, intermittent spark, or no spark, it is because an aftermarket crank timing sprocket has moved the reluctor forward and out of the sensor range.
All 24x customers have received a troubleshooting guide with the purchase of the 24x hardware. In that troubleshooting guide are measurements to take from the face of the reluctor to the face of the block to determine if the crank timing sprocket is thicker than GM's crank timing sprocket.
When you took that measurement before installing the timing cover, what was it?
All 24x customers have received a troubleshooting guide with the purchase of the 24x hardware. In that troubleshooting guide are measurements to take from the face of the reluctor to the face of the block to determine if the crank timing sprocket is thicker than GM's crank timing sprocket.
When you took that measurement before installing the timing cover, what was it?
Last edited by S10Wildside; 05-13-2012 at 07:00 AM.
05-13-2012, 08:51 AM
#24
TECH Fanatic
Thread Starter
iTrader: (7)
Join Date: Sep 2008
Location: hamilton nj
Posts: 1,830
Likes: 0
Received 0 Likes
on
0 Posts
never measured it. Are we able to tell by looking through the sensor hole? we have a leak in the back of the water pump from the freeze plug for the ewp so that has to come off. If thats the issue i guess we can correct it then 
05-13-2012, 03:26 PM
#28
TECH Regular
Join Date: Jan 2005
Posts: 456
Likes: 0
Received 0 Likes
on
0 Posts
Occasionally I receive email from double row timing set installations with a picture attachment of the reluctor shown through the sensor hole. There is no way I can say the installation is good or not without taking measurements with the timing cover removed. I can say, "it looks about right", but that's the best I can do.
05-17-2012, 08:53 PM
#29
TECH Fanatic
Thread Starter
iTrader: (7)
Join Date: Sep 2008
Location: hamilton nj
Posts: 1,830
Likes: 0
Received 0 Likes
on
0 Posts
we have spark could our issue still be from the reluctor wheel being out of range? We can't figure out why the firing order is so messed up and can't figure out how to get it fixed.
05-17-2012, 09:23 PM
#30
Teching In
Join Date: Jul 2010
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
S10Wildside can correct me i am wrong, but I think you would orient the coil harness just like you would if it were installed on an LSx engine. With this being said your problem could be that the harness is flipped and/or installed in the wrong direction. You should be able to verify the proper coil pigtail location by tracing it back to the pin at the ECU (using wire diagram, etc.)
05-18-2012, 10:21 PM
#31
S10Wildside can correct me i am wrong, but I think you would orient the coil harness just like you would if it were installed on an LSx engine. With this being said your problem could be that the harness is flipped and/or installed in the wrong direction. You should be able to verify the proper coil pigtail location by tracing it back to the pin at the ECU (using wire diagram, etc.)
OP: I am throwing the same code but my car runs great. It still needs to get the crank relearn done but no GM dealer by me will touch it because None of them know what there doing! and nobody that i know has a tech2. Im going the EFI route and saying Ef it lol
05-19-2012, 12:30 AM
#32
HP tuners will do a case learn to get rid of the 1336 code. SoxXpupPeT, lmk if you want to take a ride over the GW, I can fix that for you. IIRC, it doesn't even require a licence (read free).
PCM will default to waste fire if it doesn't have a good cam signal so it will not fire off 180, it will run with an extra spark. If it doesn't have a good crank signal, it will decline to spark at all.
I am wondering WTF is going on with a plug and play efi connection harness plus an ltcc harness.
PCM will default to waste fire if it doesn't have a good cam signal so it will not fire off 180, it will run with an extra spark. If it doesn't have a good crank signal, it will decline to spark at all.
I am wondering WTF is going on with a plug and play efi connection harness plus an ltcc harness.
05-19-2012, 01:42 AM
#33
TECH Fanatic
Thread Starter
iTrader: (7)
Join Date: Sep 2008
Location: hamilton nj
Posts: 1,830
Likes: 0
Received 0 Likes
on
0 Posts
The coil harness on the even side of the motor was all mixed up. I got the coils and coil harnesses from an old ltcc set up. We got those correct and it fired right up
05-19-2012, 07:22 AM
#34
Teching In
Join Date: Jul 2010
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
It would be very difficult to cross over the harness. It can only go on one way in the car and the coils are wired to work with the sparkplug that it sits over. Unless theirs something wrong with his coils and there wired improperly and its causing them all to fire wrong.
05-22-2012, 08:23 PM
#39
HP tuners will do a case learn to get rid of the 1336 code. SoxXpupPeT, lmk if you want to take a ride over the GW, I can fix that for you. IIRC, it doesn't even require a licence (read free).
PCM will default to waste fire if it doesn't have a good cam signal so it will not fire off 180, it will run with an extra spark. If it doesn't have a good crank signal, it will decline to spark at all.
I am wondering WTF is going on with a plug and play efi connection harness plus an ltcc harness.
PCM will default to waste fire if it doesn't have a good cam signal so it will not fire off 180, it will run with an extra spark. If it doesn't have a good crank signal, it will decline to spark at all.
I am wondering WTF is going on with a plug and play efi connection harness plus an ltcc harness.
Find one! Lol Hows she running ? Im glad you were able to figure it out! i just got mine squared away and i broke the snout off of a coil
Last edited by SoxXpupPeT; 05-22-2012 at 08:29 PM.
