Crank/Cam Position Sensor Relearn
Thread Starter
Racer
Joined: Aug 2006
Posts: 439
Likes: 0
From: Joppa MD
Crank/Cam Position Sensor Relearn
I changed a bad cam sensor and now my car starts and runs at its leisure. I know I need to do a relearn on the system. Does anyone know the steps in which to perform or does this have to be done at the dealer?
Your help is appreciated!
Your help is appreciated!
Safety Car
Joined: Jun 2004
Posts: 3,552
Likes: 738
From: panama city beach florida USA
St. Jude Donor '09
it looks like you will need a good scan tool like tech 11 or snapon to do the relearn or dealer. ive got a snapon and you dont want to be there when they do the relearn
Racer
Joined: May 2006
Posts: 402
Likes: 3
Yes a Scanner, and here is how it's done. The WOT part is what Patton is referring to. 
Install a scan tool.
Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
Select the crankshaft position (CKP) variation learn procedure with a scan tool.
The scan tool instructs you to perform the following:
4.1. Accelerate to wide open throttle (WOT).
4.2. Release throttle when fuel cut-off occurs.
4.3. Observe fuel cut-off for applicable engine.
4.4. Engine should not accelerate beyond calibrated RPM value.
4.5. Release throttle immediately if value is exceeded.
4.6. Block drive wheels.
4.7. Set parking brake.
4.8. DO NOT apply brake pedal.
4.9. Cycle ignition from OFF to ON.
4.10. Apply and hold brake pedal.
4.11. Start and idle engine.
4.12. Turn A/C OFF.
4.13. Vehicle must remain in Park or Neutral.
4.14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:
• CKP sensors activity--If there is a CKP sensor condition, refer to the applicable DTC that set.
• Camshaft position (CMP) sensor activity--If there is a CMP sensor condition, refer to the applicable DTC that set.
• Engine coolant temperature (ECT)--If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
Enable the CKP system variation learn procedure with a scan tool.
Important: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete.
Accelerate to WOT.
Release when the fuel cut-off occurs.
Test in progress
The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315 . If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:
• A CKP sensor replacement
• An engine replacement
• A ECM replacement
• A harmonic balancer replacement
• A crankshaft replacement
• Any engine repairs which disturb the CKP sensor relationship
Install a scan tool.
Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
Select the crankshaft position (CKP) variation learn procedure with a scan tool.
The scan tool instructs you to perform the following:
4.1. Accelerate to wide open throttle (WOT).
4.2. Release throttle when fuel cut-off occurs.
4.3. Observe fuel cut-off for applicable engine.
4.4. Engine should not accelerate beyond calibrated RPM value.
4.5. Release throttle immediately if value is exceeded.
4.6. Block drive wheels.
4.7. Set parking brake.
4.8. DO NOT apply brake pedal.
4.9. Cycle ignition from OFF to ON.
4.10. Apply and hold brake pedal.
4.11. Start and idle engine.
4.12. Turn A/C OFF.
4.13. Vehicle must remain in Park or Neutral.
4.14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:
• CKP sensors activity--If there is a CKP sensor condition, refer to the applicable DTC that set.
• Camshaft position (CMP) sensor activity--If there is a CMP sensor condition, refer to the applicable DTC that set.
• Engine coolant temperature (ECT)--If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
Enable the CKP system variation learn procedure with a scan tool.
Important: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete.
Accelerate to WOT.
Release when the fuel cut-off occurs.
Test in progress
The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315 . If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:
• A CKP sensor replacement
• An engine replacement
• A ECM replacement
• A harmonic balancer replacement
• A crankshaft replacement
• Any engine repairs which disturb the CKP sensor relationship
Intermediate
Joined: Feb 2012
Posts: 36
Likes: 0
Will the new bluetooth scan tools like the obdlink mx from scantool.net offer the ability to launch these learning procedures?
Are there specific snapon scanners that work, or can I just get their cheapest one if they all have this feature?
Are there specific snapon scanners that work, or can I just get their cheapest one if they all have this feature?
Yes a Scanner, and here is how it's done. The WOT part is what Patton is referring to.
Install a scan tool.
Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
Select the crankshaft position (CKP) variation learn procedure with a scan tool.
The scan tool instructs you to perform the following:
4.1. Accelerate to wide open throttle (WOT).
4.2. Release throttle when fuel cut-off occurs.
4.3. Observe fuel cut-off for applicable engine.
4.4. Engine should not accelerate beyond calibrated RPM value.
4.5. Release throttle immediately if value is exceeded.
4.6. Block drive wheels.
4.7. Set parking brake.
4.8. DO NOT apply brake pedal.
4.9. Cycle ignition from OFF to ON.
4.10. Apply and hold brake pedal.
4.11. Start and idle engine.
4.12. Turn A/C OFF.
4.13. Vehicle must remain in Park or Neutral.
4.14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:
• CKP sensors activity--If there is a CKP sensor condition, refer to the applicable DTC that set.
• Camshaft position (CMP) sensor activity--If there is a CMP sensor condition, refer to the applicable DTC that set.
• Engine coolant temperature (ECT)--If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
Enable the CKP system variation learn procedure with a scan tool.
Important: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete.
Accelerate to WOT.
Release when the fuel cut-off occurs.
Test in progress
The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315 . If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:
• A CKP sensor replacement
• An engine replacement
• A ECM replacement
• A harmonic balancer replacement
• A crankshaft replacement
• Any engine repairs which disturb the CKP sensor relationship
Install a scan tool.
Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
Select the crankshaft position (CKP) variation learn procedure with a scan tool.
The scan tool instructs you to perform the following:
4.1. Accelerate to wide open throttle (WOT).
4.2. Release throttle when fuel cut-off occurs.
4.3. Observe fuel cut-off for applicable engine.
4.4. Engine should not accelerate beyond calibrated RPM value.
4.5. Release throttle immediately if value is exceeded.
4.6. Block drive wheels.
4.7. Set parking brake.
4.8. DO NOT apply brake pedal.
4.9. Cycle ignition from OFF to ON.
4.10. Apply and hold brake pedal.
4.11. Start and idle engine.
4.12. Turn A/C OFF.
4.13. Vehicle must remain in Park or Neutral.
4.14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:
• CKP sensors activity--If there is a CKP sensor condition, refer to the applicable DTC that set.
• Camshaft position (CMP) sensor activity--If there is a CMP sensor condition, refer to the applicable DTC that set.
• Engine coolant temperature (ECT)--If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
Enable the CKP system variation learn procedure with a scan tool.
Important: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete.
Accelerate to WOT.
Release when the fuel cut-off occurs.
Test in progress
The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to DTC P0315 . If any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:
• A CKP sensor replacement
• An engine replacement
• A ECM replacement
• A harmonic balancer replacement
• A crankshaft replacement
• Any engine repairs which disturb the CKP sensor relationship
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Drifting
Joined: Sep 2000
Posts: 1,492
Likes: 12
From: Milwaukee, WI / NYC, NY
I just was at the dealer trying this procedure on my LS3 that has been cammed. The car is a race car, and I had to replace the ECU after it got fried for an unrelated reason.
Car had a new ECM installed, but the car was not happy idling with the stock tune that was associated with my VIN and uploaded to the ecm by the dealer.
We tried the relearn procedure with the car running on the stock tune, but no dice. I reflashed the ecm using HPTuner with my cal for the cam, and the car idled and revved fine.
Went to finish and do the relearn, and it keeps asking me to do the wide open throttle deal. This is at the dealer, with the GM tech using a tech 2.
Couldn't get it to learn.
Anyone hAve this experience, and how did you solve?
Car had a new ECM installed, but the car was not happy idling with the stock tune that was associated with my VIN and uploaded to the ecm by the dealer.
We tried the relearn procedure with the car running on the stock tune, but no dice. I reflashed the ecm using HPTuner with my cal for the cam, and the car idled and revved fine.
Went to finish and do the relearn, and it keeps asking me to do the wide open throttle deal. This is at the dealer, with the GM tech using a tech 2.
Couldn't get it to learn.
Anyone hAve this experience, and how did you solve?
Melting Slicks
Joined: Oct 2010
Posts: 2,220
Likes: 16
From: Sugarhill Ga
i don't understand why you have to relearn a cam sensor signal. I changed mine when my cam gear broke and never had this problem. Are you sure you have it plugged in ? Both conectors ? Don't forget there is an extension harness.
1st Gear
Joined: Sep 2018
Posts: 1
Likes: 0
I just was at the dealer trying this procedure on my LS3 that has been cammed. The car is a race car, and I had to replace the ECU after it got fried for an unrelated reason.
Car had a new ECM installed, but the car was not happy idling with the stock tune that was associated with my VIN and uploaded to the ecm by the dealer.
We tried the relearn procedure with the car running on the stock tune, but no dice. I reflashed the ecm using HPTuner with my cal for the cam, and the car idled and revved fine.
Went to finish and do the relearn, and it keeps asking me to do the wide open throttle deal. This is at the dealer, with the GM tech using a tech 2.
Couldn't get it to learn.
Anyone hAve this experience, and how did you solve?
Car had a new ECM installed, but the car was not happy idling with the stock tune that was associated with my VIN and uploaded to the ecm by the dealer.
We tried the relearn procedure with the car running on the stock tune, but no dice. I reflashed the ecm using HPTuner with my cal for the cam, and the car idled and revved fine.
Went to finish and do the relearn, and it keeps asking me to do the wide open throttle deal. This is at the dealer, with the GM tech using a tech 2.
Couldn't get it to learn.
Anyone hAve this experience, and how did you solve?
I have the same issue wi5h my tech 2 on my ls3 it doesnt cutt off not sure what I'm doing wrong
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,605
Likes: 4,060
From: Cape Coral, Florida
Last edited by C5 Diag; Mar 2, 2019 at 04:01 PM.
