OT:GM relearn procedures for diesel and gassers for most required systems - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
Home Forum Market Place Garage Tuning Library DTC Tool Register Vendors
Go Back   Diesel Place : Chevrolet and GMC Diesel Truck Forums > GM Diesel Engines > 6.5L Diesel Engine
Register FAQ Forum Rules My Replies My Threads Mark Forums Read Advertise

6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

DieselPlace.com is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools
Old 12-07-2014, 10:15 AM   #1 (permalink)
racer55
6.5TD Post Addict
 
racer55's Avatar
 
Join Date: Jul 2010
Location: Scugog Island Ontario Canada
Posts: 9,885
iTrader Score: 0 reviews

Ontario Diesel Place Chapter Member

Old School Oil Burners (Old SOBs) Member

OT:GM relearn procedures for diesel and gassers for most required systems

Found this nugget during a search and thought I would pass it along for required procedures following these repairs:

Powertrain Control Computer replacement with a nontransferable PROM
Powertrain Control Computer reprogramming
Body Control Computer
Instrument Cluster replacement
Engine replacement
Crankshaft replacement
Crankshaft harmonic balancer replacement
Crankshaft position sensor replacement
Diesel Engine controller
Diesel engine PCM with or without injection pump replacement
Diesel engine front cover replacement.


GM Computer Relearn Procedure (including Crankshaft relearn)

__________________
No longer a 6.5 owner
2005 Chev K3500 CCLB Dmax

Diagnostic Checklist 2.0
OBD1 Codes
OBD2 Codes
6.5 FAQ
Carcode & TDCO Instructions
Offline  
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 12-07-2014, 10:27 AM   #2 (permalink)
aprr454
Diesel Head
 
Join Date: Oct 2004
Location: Northern Illinois
Posts: 541
iTrader Score: 1 reviews

I replaced my harmonic balancer and crank postions sensor, did the TDC relearn as described in your link, and either I didn't notice the rpm stumble or it didn't work. The truck runs very well regardless with no codes.

__________________
'06 GMC CCLB, 2500HD, 4x4, LLY/Allison
DSP2 Spade, Magnaflow 3" DP, Magnaflow 4" DP Back , High Idle Mod, CAT Filter Adapter(using Donaldson filters), FASS Titanium 150, B&W gooseneck hitch, Curt 18k receiver hitch

'96 GMC ECSB 2500, 6.5, 4l80e, 4x4, 4.10, PMD relocate, 4" Diamond Eye Exhaust, 9' Western Plow

'03 Chevy ECLB, 2500HD, 4x4, D/A SOLD

"Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery" Winston Chruchill

"Underlying most arguments against the free market is a lack of belief in freedom itself." Milton Friedman
Offline   Reply With Quote Quick reply to this message
Old 12-07-2014, 10:39 AM   #3 (permalink)
Freddyack
Lead Moderator
Diesel Guru
 
Freddyack's Avatar
 
Join Date: Jul 2011
Location: Denver, CO
Posts: 9,491
iTrader Score: 0 reviews

CT Smoke Member

Old School Oil Burners (Old SOBs) Member

DieselPlace.com Lifetime Premium Member

The Suburban Club Member

Quote:
Originally Posted by racer55 View Post
Found this nugget during a search and thought I would pass it along for required procedures following these repairs:

Powertrain Control Computer replacement with a nontransferable PROM
Powertrain Control Computer reprogramming
Body Control Computer
Instrument Cluster replacement
Engine replacement
Crankshaft replacement
Crankshaft harmonic balancer replacement
Crankshaft position sensor replacement
Diesel Engine controller
Diesel engine PCM with or without injection pump replacement
Diesel engine front cover replacement.


GM Computer Relearn Procedure (including Crankshaft relearn)
Added to Reference Manuals on first page of FAQs
__________________
Offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 01-13-2017, 03:45 AM   #4 (permalink)
EppNation
Diesel Head
 
EppNation's Avatar
 
Join Date: Dec 2015
Location: Tampa
Posts: 558
iTrader Score: 0 reviews

The Suburban Club Member

Original link to FSC is dead.

Did anyone save the document (assuming it was a .pdf) while link was live?
__________________
97 K2500 Suburban LT
Acquired Nov '12 @ 199k
285k as of Feb '19 (daily driver)
6.5L L65, 4L80E, 14BFF @ 3.73 gears
Opti-Lube Diesel XPD
Heath Turbo Master, Vac Pump Delete, Dual AD244 Alternators, PTWS Battery Cables, Power Steering Cooler & FF Filter, Coolant Bypass Filter, ScanGaugeII, 235/85/16 Michelin LTX A/T^2s on GMT800 PYOs
Offline   Reply With Quote Quick reply to this message
Old 01-13-2017, 09:52 AM   #5 (permalink)
OkDually
Moderator
 
OkDually's Avatar
 
Join Date: Jul 2013
Location: N.E. Oklahoma
Posts: 12,892
iTrader Score: 0 reviews

DieselPlace.com Lifetime Premium Member

Quote:
Originally Posted by EppNation View Post
Original link to FSC is dead.

Did anyone save the document (assuming it was a .pdf) while link was live?
Here is a copy and paste from another site:

GENERAL MOTORS VEHICLE COMPUTER RELEARN PROCEDURES

Performing any of the following repairs may require you to initiate a computer relearn procedure in order to restore proper vehicle operation.

Powertrain Control Computer replacement with a nontransferable PROM
Powertrain Control Computer reprogramming
Body Control Computer
Instrument Cluster replacement
Engine replacement
Crankshaft replacement
Crankshaft harmonic balancer replacement
Crankshaft position sensor replacement
Diesel Engine controller
Diesel engine PCM with or without injection pump replacement
Diesel engine front cover replacement.

Here are some helpful tips to perform the system relearn, depending upon the particular repair that you have performed.

Powertrain Control Computer Replacement with a nontransferable PROM

All computers being replaced must be reprogrammed or reflashed, This is so the replacement computer has the most up-to-date information for that particular vehicle. This information is specific for the vehicle based on the vehicle identification number, and cannot be used on another vehicle, even though they may appear to be similar. Relearn procedures involve: Crankshaft Variation (CASE Learn), Engine Idle speed, Theft Deterrent password, and Transmission adaptive shift points.

Powertrain Control Computer Reprogramming

If diagnostics reveal that a reprogram or re-flash of the computer is necessary, relearn procedures involve:

Crankshaft Variation (CASE Learn), Engine Idle speed, Theft Deterrent password, and Transmission adaptive shift points. Body Control Computer &/or Instrument Cluster replacement Theft deterrent password relearn is necessary. Engine, crankshaft, harmonic balancer, and crankshaft position sensor. If any of the above items are replaced, then a Crankshaft Variation relearn is necessary.

RELEARN PROCEDURES

IMPORTANT: Please note that the Theft Deterrent Password Relearn must be performed first, otherwise the vehicle may not start.

THEFT DETERRENT PASSWORD RELEARN

General Motors uses three different types of vehicle theft deterrent systems in their cars and trucks manufactured from 1986.

They are:

1. Pass-key or Passkey 2 (PK2)
2. Passlock
3. Passkey 3 (PK3) or Passkey 3+

Instead of listing all of the vehicles and the systems that they use, we will simplify the identification process by taking a look at the vehicle ignition key (Refer to page 8 for key identification). There is one other system, referred to as VATS (Vehicle Anti-theft System) that is used by GM. This system is similar to Passkey, but since a relearn is not necessary, we will not elaborate on this system in this article. By referring to the chart and matching the correct key, you can safely identify the system that the vehicle uses, and, in turn, determine the correct relearn procedure. Just remember, that this article pertains only to those vehicles with a re-programmable or re-flashable PCM.


PASSKEY & PASSKEY 2

This system consists of: the Powertrain Control Module (ECM or PCM), Body Control Module (BCM) or Passkey theft deterrent module, and the ignition lock and key. In most cases, the theft deterrent duties are handled by a Passkey module. In those vehicles, if you are replacing a key, all you must do is match the resistance of the existing key that is in use. If you replace the theft deterrent module, then the module will learn the existing key resistance with the first start up sequence. At that point, the resistance is permanently memorized by the module, and can no longer be changed. No relearn is necessary. In this situation, the vehicle will start and run with no problem. If the vehicle won't start, check your scan tool for a VTD (Vehicle Theft Deterrent) Fail-Enable Mode trouble code, or if the security light on the dash is illuminated. If you have this code, then the vehicle probably is equipped with a BCM, and you must perform a relearn.

The next section applies only to those vehicles that use a BCM.

For those vehicles that use a BCM, the BCM can learn the resistance value of the existing key by using the relearn process. In order for the vehicle to start, the BCM (as well as the Passkey module in other vehicles) must identify the resistor pellet in the key, then the BCM sends a password to the PCM. If this password matches the password stored in the PCM, the system enables fuel delivery. So you can see that if either the BCM or PCM are replaced, a relearn procedure is necessary. This same relearn procedure can be used if an ignition key with a different resistance value is used to replace the existing key. Before beginning the relearn, make sure there is a fully charged battery in the vehicle, and both the BCM and PCM are properly powered up and in communication with each other. Now you're ready to initiate the relearn procedure.

1. First, insert the ignition key and turn the ignition switch to the On position (Do not start the engine). Leave the switch on for 11 minutes. The security light may flash or be on steady during this 11 minute period. Make sure the light is no longer on or flashing before proceeding to #2 .
2. Turn the ignition switch off for 30 seconds.
3. Turn the ignition switch to the On position (as in step #1) for 11 minutes again.
4. Turn the ignition switch off for another 30 seconds.
5. Turn the ignition switch to the On position for 11 minutes a third time.
6. Turn the ignition switch off for 30 seconds one final time.
7. Turn the ignition switch to the On position one final time and wait 30 seconds.
8. Attempt to start the engine. If the engine starts and runs normally, the relearn is complete. If the engine does not start, check for trouble codes and address them before attempting the relearn procedure again.


PASSLOCK

The Passlock system is designed to prevent vehicle operation if the key is not used to start the vehicle. The key, which does not contain a resistor will turn the Passlock lock cylinder. The Passlock lock cylinder will relay a resistance code to the instrument panel cluster (IPC). It does this by rotating a magnet past a stationary hall effect sensor, creating a resistance code. At this point the IPC will determine if the resistance code is correct and within an acceptable time frame. If the code is correct, the IPC will send a coded password to the powertrain control module (PCM). If the PCM receives the correct password, it will allow the fuel injectors to operate normally and the vehicle will start and run normally. If the correct resistance code from the lock cylinder is not received within the acceptable time frame, the vehicle will go into a short tamper mode during which the theft deterrent system will not allow the vehicle to operate for approximately 4 seconds. When this occurs, the security indicator will flash. After three consecutive failed tries, the system will enter into a long tamper mode. In this mode, the fuel injectors will be disabled for approximately 10 minutes, and the security indicator will be flashing. Please note that in any of the tamper modes, the vehicle may start, but it will quickly stall.

Default
The Passlock system is designed to prevent vehicle theft even if any of the theft deterrent parts are replaced. Passlock eliminates the need for the key mounted resistor. Parts that can no longer be replaced without the possibility of the system going into a tamper mode and prevent starting are: the lock cylinder, the instrument panel cluster (IPC), and the powertrain control module (PCM).

In order to initiate the relearn:

1. Hook up your scan tool to erase any of the passlock/vehicle theft deterrent trouble codes. If there are any other codes, note them before you erase them, so you may address them after the relearn has been completed.
2. With the ignition key in the On position from the code-clearing step, attempt to start the vehicle. At this point, if the vehicle starts, and the security light has not illuminated, a relearn is not necessary, and you're done. If the vehicle starts and stalls, leave the key in the Run position and wait for the Security light to turn off. This will take approximately 10 minutes. At any time during this relearn, the light may flash or be on steady. If the ignition switch is turned off at any time during this relearn cycle that the security light is illuminated, the entire cycle must be restarted from the beginning. For most cars, one cycle will be sufficient for the relearn. If the vehicle will not start after the first cycle, then continue the process from step #3 to the end. Most trucks will require that you continue from step #3 to the end.
3. When the light turns off, turn the ignition switch to the Off position for approximately ten seconds.
4. Next, repeat steps 2 and 3 two more times for a total of three cycles. After the third time, the new code will be relearned on the next start attempt when the ignition switch is rotated from the Off position.
5. From the Off position, start the vehicle, observing the security light. If the vehicle starts and runs normally, and the security light is off, the relearn is complete. If the vehicle does not start, check for trouble codes before proceeding further.

PASSKEY 3 AND PASSKEY 3+

In this system, the vehicle theft deterrent functions are provided by the theft deterrent control module. There is a transponder embedded in the head of the key that becomes energized by the exciter coils in the ignition lock cylinder when the ignition switch is turned on. The energized transponder now transmits a signal containing a unique value to the theft deterrent control module. If the module accepts this value, then there is an additional communication that takes place between the module and the key. If the module and the key agree, then the module sends the fuel enable password to the PCM. If the PCM recognizes the password, then the vehicle starts and runs normally. If any of the communication between the module and the key is incorrect or the PCM does not recognize the password, then the fuel injectors are disabled. The ignition key is a normal looking key with no visible contacts as in the Passkey or VATS systems. The transponder is located in the key head. The transponder value is fixed and cannot be changed. These keys are usually identified by the letters PK3, or PK3+ stamped into the steel body. A relearn will be necessary if any of the following have been replaced: any key, the theft deterrent control module or the powertrain control module (PCM). When the theft control module is being replaced, the module will learn the existing keys immediately. However, the PCM must learn the new fuel enable password from the new module. If you are replacing a PCM with a PCM that has been used in another vehicle or has been remanufactured, then a relearn must be performed in order for the PCM to learn the fuel enable password. Keep in mind that when you perform a relearn on this system, all previously learned keys will be erased from the theft deterrent control module's memory. Any additional keys may be relearned immediately after the first relearn has been performed by inserting the additional key and turning the ignition switch to the €œOn€ position within ten seconds of removing the previously learned key.

In order to initiate the relearn process:

1. Insert a master key (black head) into the ignition switch.
2. Turn to the On position without starting the engine. The security light should illuminate and stay on.
3. Wait approximately 10 minutes or until the security light turns off.
4. Turn off the ignition switch and wait 5 seconds.
5. Repeat steps 2 through 4 two more times with the same key.
6. Turn the ignition off. The vehicle will now learn the key transponder information on the next start cycle.
7. Start the vehicle. If vehicle starts and runs normally, and security light is off, the relearn is complete.

If additional keys are to be relearned:

8. Turn the vehicle off.
9. Insert the next key to be learned and turn the ignition switch to the On position within 10 seconds of removing the previously used key.
10. Wait for the security light to turn off. It should happen quickly. You may not even notice the light come on, because it will learn the key transponder immediately.
11. Repeat steps 8 through 10 for any additional keys.

Default
CRANKSHAFT VARIATION RELEARN (CASE Learn)

CASE means: crankshaft angle sensor error. A crankshaft variation relearn must be performed if:

A diagnostic trouble code of P1336 is present.
The computer has been replaced or re-programmed.
The crankshaft position sensor has been replaced.
The engine, harmonic balancer, clutch, or flywheel have been: disassembled, removed, or replaced.
The crankshaft position variation learning feature enables the computer to compensate for part manufacturing tolerances. This allows the computer to accurately detect an engine misfire throughout the engine RPM range. The learning process is stored in the computer's memory and does not have to be repeated unless one or more of the above conditions are present.


To perform the relearn, proceed as follows:

Connect a scan tool to make sure there are no trouble codes stored in the computer's memory. If there is any power train trouble code other than P1336 (Crankshaft Position Variation not learned), the computer will disable the relearn function until the problem that aused the code has been eliminated. Also, make sure that the engine coolant (check it when the engine is cold) and oil levels are at an acceptable level.

1. Set the parking brake and block the drive wheels. Make sure that the hood is closed.
2. Start the engine and make sure that the engine coolant temperature is at least 158 degrees F. (70 degrees C.)
3. Turn the engine off for at least 10 seconds.
4. Select the crankshaft position variation learn procedure (CASE Learn)on your scan tool.
5. Make sure that the transmission is in Park. Start the engine.
6. Apply the brakes and hold the pedal firmly.
7. Follow the scan tool instructions.

Remember: That you are going to increase the engine speed to approximately 3000 RPM, 4000 RPM, or 5150 RPM. That's the variation learn fuel cutoff RPM (depending upon the engine), and that it's important to release the throttle when the engine RPM starts to decrease as a result of the fuel cutoff going into effect. Failure to do such will result in over revving of the engine, causing possible engine damage.

8. Once the engine has returned to idle, check the status of Diagnostic trouble code P1336. If the scan tool indicates that the CASE has been learned, the relearn procedure is now complete. If CASE has not been learned, check for the presence of other power train codes. If any exist, correct the problem, then repeat this procedure.

NOTE: If the Crankshaft Variation Relearn is not accessible through your scan tool (some truck applications 1998 & later), perform the relearn in the following manner:

1. Turn off all of the accessories. With the Air temperature sensor and Coolant temperature within 5 degrees (Centigrade) of each other, start the engine and let it idle in Park or Neutral for two minutes.
2. Accelerate the vehicle to 55 mph at part throttle. Cruise at 55 mph for 8- 10 minutes until the engine reaches operating temperature.
3. Cruise at 55 mph for another 5-6 minutes.
4. Decelerate to 45 mph without using the brakes, and maintain 45 mph for 1 minute.
5. Perform 4 deceleration cycles, without using the brakes, of 25 seconds each where no specific speed is necessary. Returning to 45 mph for 15 seconds in between deceleration cycles.
6. Accelerate to 55 mph and cruise for 2 minutes.
7. Stop the vehicle and idle for 2 minutes with the brake applied and the transmission in Drive (automatic trans.) or Neutral (manual trans.) with the clutch depressed. Refer to diagram A on page number 8.

BASE IDLE RELEARN


The Computer will reset the idle air control valve whenever the ignition switch is turned to the On position, then to the Off position. However, before you return the car to the customer, it is best to bring the engine up to operating temperature in Park with the air conditioning off. Then, turn the air conditioning on. Next, turn the air conditioning off. Next, place the transmission selector in drive. Finally, with the car in Drive, turn the air conditioning on. That's it!
__________________
1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube summer + Formula


Proud member #1039 of The 3500 Dually Club


Last edited by OkDually; 01-13-2017 at 09:56 AM.
Online   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Diesel Place : Chevrolet and GMC Diesel Truck Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

PLEASE READ! You must check your email inbox for the confirmation link to complete registration. Please check your spam box if you do not see the email in your inbox.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Insurance
Please select your insurance company (Optional)

Log-in


Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
6.5L Diesel Engine Tdc Offset Relearn Procedures Phiberoptik 6.5L Diesel Engine 18 01-20-2016 09:48 PM
Don't you hate it when gassers take the diesel pump!?! tjZ06 Off Topic 36 03-21-2011 08:43 PM
Help , whats the relearn process for the ppe tranny relearn illduramax Fourth Generation Duramax Electronics/Tuners 3 08-24-2007 02:17 PM
Tranny Relearn Procedures? mr._bowtie Allison OEM 7 05-03-2007 10:04 AM
2006 Low Sulfur Diesel Required !!!!???? Ferreira Maintenance & Fluids 3 08-15-2006 03:30 PM


All times are GMT -4. The time now is 11:21 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Shoutbox provided by vBShout v6.2.1 (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
© AutoGuide