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What is your question?
I was getting three OBD codes on my car, PO300,302,304. I had the crank sensor replaced, then the ignition coil and then a manifold gasket. The misfire codes went away and then I started getting a code PO315. I took it into a mechanic to do the crank relearn on a tech 2 scanner and it will say it is learned, the check engine light goes off but as soon as the key is put into the ignition, the check engine light comes right back on. I need to know what to do now? I need to get it fixed to pass the emissions test!
3 Replies
FIRST:::: Why was the crank sensor replaced to start with???? NOW....Were the codes cleared before crank relearn was performed?... Top quality sensor? ... Wiring and connector ok?...Check engine light 'flashing' while driving?? just don't make sense as you stated the scanner confirmed relearn!!
Only thing is it didn't have the relearn code to start with as far as what I've read here!... Can't help much online, just wish I could take a shot at it with my own equipment!... That don't help...but it's got to be related to the work that was done... Possible sensor tone ring issue!
The original mechanic was trying to tell me that I need a crankshaft pulse wheel, I thought the same thing, if the problem was PO315 to begin with maybe but otherwise that does not make sense. That is what led to switching mechanics. I do appreciate your time.
hey i seem to be having the same issue as you where having with this car did you ever get the issue figured out and if so what was the solution
The below is from Alldata...Note it says the relearn may have to be done 5 times....Hope it helps. DTC P0315 DTC DESCRIPTOR DTC P0315 Crankshaft Position (CKP) System Variation Not Learned DIAGNOSTIC FAULT INFORMATION Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: A L L Diagnostic Trouble Codes ( DTC ) > Testing and Inspection CIRCUIT/SYSTEM DESCRIPTION The crankshaft position (CKP) system variation learn feature is used to calculate reference period errors caused by slight tolerance variations in the crankshaft, and the crankshaft position sensor. The calculated error allows the engine control module (ECM) to accurately compensate for reference period variations. This enhances the ability of the ECM to detect misfire events over a wider range of engine speed and load. The CKP system variation compensating values are stored in ECM memory after a learn procedure has been performed. If the actual CKP variation is not within the CKP system variation compensating values stored in the ECM, DTC P0300 may set. If the CKP system variation values are not stored in the ECM memory, DTC P0315 sets. CONDITIONS FOR RUNNING THE DTC - DTCs P0016, P0106, P0107, P0108, P0117, P0118, P0122, P0123, P0132, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0324, P0325, P0335, P0336, P0340, P0351, P0352, P0402, P0404, P0405, P0406, P0488, P0502, and P0700 are not set. - The engine coolant temperature (ECT) is more than 65°C (149°F). - DTC P0315 runs continuously once the above conditions are met. CONDITIONS FOR SETTING THE DTC The ECM detects that the CKP system variation values are not stored in memory. ACTION TAKEN WHEN THE DTC SETS DTC P0315 is a Type B DTC. CONDITIONS FOR CLEARING THE DTC DTC P0315 is a Type B DTC. CIRCUIT/SYSTEM TESTING IMPORTANT: The CKP System Variation Learn Procedure may have to be repeated up to 5 times before the procedure is learned. Perform the CKP System Variation Learn Procedure. 1. If the scan tool displays NOT learned this ignition, inspect for the following conditions: - A worn or damaged crankshaft or crankshaft bearings - Debris between the CKP sensor and the reluctor wheel - A damaged reluctor wheel - Excessive crankshaft runout - Any interference of the CKP sensor or CKP sensor signal to the control module 2. If the control module is unable to complete the learn procedure, replace the control module. 3. If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List. REPAIR INSTRUCTIONS Perform the Diagnostic Repair Verification after completing the diagnostic procedure. See: A L L Diagnostic Trouble Codes ( DTC ) > Verification Tests
I am having this issue we run a repair shop and this car sat in the yard over winter we brought it in did some brake work charged the battery and we replaced the crank sensor and did the relearn the scan tool snap on solus does not support chevy optra not with my latest up date any way so i went in under a suzuki forenza and i am able to complete the relearn it says relearn successful and the CEL goes out but when i turn the car off and start it again it comes right back on if i clear the code while engine is running the light only blinks then back on solid i have done the successful relearn over 20 times still when i shut off and back on the light comes right back if there was a mechanical issue i dont think i would get a successful learn do you have any tips?
I am having the same problem with my 2006 Aveo. Help!!! Have you or anyone had any success with this issue? I would appreciate any info.. Thanks
The misfire codes cleared after the manifold gasket was replaced. The sensor was replaced because the mechanic told me it was needed, he bought it from Autozone. I took it to a different mechanic and he put the original sensor back on but did crank relearn with both. He got the exact same readings and error codes with both of the sensors. He told me that the tech scanner will say relearn, the check engine light goes out but comes back on when the key is put into the igntion. Same thing with disconnecting the battery, the CEL goes out but when you put the key in ignition it comes back on. He thought that it needs to be reflashed but admitted to being stumped