Harmonic balancer/crankshaft relearn?
04-19-2016, 02:51 PM
#1
Instructor
Thread Starter
Harmonic balancer/crankshaft relearn?
Does a "crankshaft relearn procedure" need to be done after replacing the harmonic balancer on my 2010 GS? If so, will this affect the tune I have? Is a relearn the same as PCM/ECM flash or is this a procedure that can be done without flashing PCM/ECM?
Last edited by legalins; 04-19-2016 at 03:23 PM.
04-19-2016, 03:33 PM
#2
Melting Slicks
did you change to under drive or over drive or factory diameter pulley?
If factory diameter, you shouldnt have to do anything.
If under or overdrive, you might, im not familiar with them.
If factory diameter, you shouldnt have to do anything.
If under or overdrive, you might, im not familiar with them.
04-19-2016, 03:45 PM
#3
Instructor
Thread Starter
I'm staying with OEM size/pulley. So it looks like I don't have to worry about anything with the PCM/ECM, correct? I was worried about messing up my tune, thanks.
04-19-2016, 04:05 PM
#4
Melting Slicks
Nothing done to change the tune or crankshaft positioning sensor when you put the damper bolt back use thread lock and torque to 240 lbs. You are good to go last step (very important) cause the bolt does come lose and is not fun.
04-19-2016, 05:51 PM
#5
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St. Jude Donor '15
No.
04-19-2016, 06:48 PM
#6
Instructor
Thread Starter
04-20-2016, 10:17 AM
#8
Safety Car
yes
according to the factory service manual a crank relearn procedure should be performed even if system does not set a CEL after component replacement.it does not affect your tune.page 6-793 in your factory service manual
Last edited by irok; 04-20-2016 at 10:35 AM.
04-20-2016, 12:25 PM
#9
Instructor
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04-20-2016, 09:41 PM
#10
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St. Jude Donor '13
My Service Manual agrees with irok, they just replaced my balancer and I'm hoping they did the crank relearn procedure. Correctly.
What would the symptoms be if they didn't do it?
What would the symptoms be if they didn't do it?
04-21-2016, 06:34 PM
#13
Safety Car
possible
basically sensors possibly out of sync with each other and ECM.long crank to start but doesn't necessarily mean you will have an issue.if crank relearn not learned it shows as not complete
Last edited by irok; 04-21-2016 at 06:37 PM.
04-21-2016, 09:08 PM
#14
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St. Jude Donor '13
Ours seems to be running normally after the work. Good.