Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Whenever Crankshaft Position Sensor is replaced:Perform the CKP system Variation Learn Procedure
Install a scan tool. Monitor the 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.
With a scan tool, select the CKP system variation learn procedure and perform the following:Observe the fuel cut-off for the applicable engine. Block the drive wheels. Set the parking brake. Place the vehicle's transmission in Park or Neutral. Turn the air conditioning (A/C) OFF. Cycle the ignition from OFF to ON. Apply and hold the brake pedal for the duration of the procedure. Start and idle the engine. Accelerate to wide open throttle (WOT). The engine should not accelerate beyond the calibrated fuel cut-off RPM value noted in step 3.1.
Release the throttle immediately if the value is exceeded.
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 the throttle when fuel cut-off occurs.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.
You will need to scan for Trouble Codes firstClear the Trouble Codes & then check for the starting issue.Could be Security, Crank Sensor, Spark, Fuel, etc.
you can clear the code even if it does not start. right now the car is a the dealer it is not under warranty . also do you need to reflash for the stage 2 or does this take care of both when it is relearned.
Use of Scan Tool should do both as long as the stage 2 is accepted by Computer
If it was running before you replaced the 2 sensors & now it is notIt could be the Sensors, esp[ecially if you used another brand other than GM Parts.Trouble Codes should have been read prior to any other repair when the problem started
Use of scan tool should be able to find the problem & testing of the different circuits & modules will be needed.If it never started after the Sensor was installed, Sensor could have crack when installed, Reluctor could have been damaged, Security System, Fuel Pressure, etc.
at this point, from what you are describing, it could be as simple as clearing Trouble Codes & getting engine to start, then program Sensor/s.It can be something serious as the reluctor, but this should be able to be seen by Scan Tool when testing
so what you are saying that the code need to be cleared and then the car should start .then if not the computer needs to be reflashed. I just don't want this dealer to hand me a story. This car is a nightmare
Trouble Codes need to be displayed, checked, problem fixed, before clearing Codes.Start vehicle, program Sensor/s
I understand....................sorry for the trouble.Most Dealers will do it straight & try not to go overboard