Anybody have a nice bidirectional scan tool that can do a crank case relearn on GM (2005 Chevy Silverado 2500HD)? I'm in Normandy Park which is just south of Burien. I'd like to either borrow it or spend a few minutes of intimate time with your scan tool in your driveway. I'd bring you the beverage of your choice.
I'm holding off putting in a new crank case position sensor until I figure out where I'll get the relearn done. Like to avoid dealership or mechanic if at all possible. Though if you have a recommendation of a local pro that could do it quick, good and cheap....
To my understanding, no. It's based on having the computer in "learn mode" with the engine revving. I've read every possible article on "relearn without scan tool" and I'm "internet confident" that I should do it within 250 miles of changing it.
This from my alldatadiy subscription...
CKP SYSTEM VARIATION LEARN PROCEDURE
Install a scan tool.
Monitor the powertrain control module (PCM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information for the applicable DTC.
Select the crankshaft position variation learn procedure with a scan tool.
The scan tool instructs you to perform the following:
Accelerate to wide open throttle (WOT).
Release throttle when fuel cut-off occurs.
Observe fuel cut-off for applicable engine.
Engine should not accelerate beyond calibrated RPM value.
Release throttle immediately if value is exceeded.
Block drive wheels.
Set parking brake.
DO NOT apply brake pedal.
Cycle ignition from OFF to ON.
Apply and hold brake pedal.
Start and idle engine.
Turn the A/C OFF.
Vehicle must remain in Park or Neutral.
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:
Crankshaft position (CKP) sensors activity-If there is a CKP sensor condition, refer to the applicable DTC.
Camshaft position (CMP) signal activity-If there is a CMP signal condition, refer to the applicable DTC.
Engine coolant temperature (ECT)-If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
Enable the CKP system variation learn procedure with the scan tool.
Accelerate to WOT.
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.
Release throttle when fuel cut-off occurs.
The scan tool display reads 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 in Vehicle DTC Information for the applicable DTC.
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 or not DTC P0315 is set:
An engine replacement
A PCM replacement
A harmonic balancer replacement
A crankshaft replacement
A CKP sensor replacement
Any engine repairs which disturb the crankshaft to CKP sensor relationship.
Wouldn't unplugging the battery for a spell essentially do the same thing?