Crank Relearn ?
07-13-2007, 12:38 PM
#1
12 Second Club
Thread Starter
iTrader: (1)
Join Date: Oct 2006
Location: Oil City, La.
Posts: 553
Likes: 0
Received 0 Likes
on
0 Posts
Crank Relearn ? What would cause my 02 SS to not take a crank relearn? Car has been misfireing PO300 & now a PO306. I changed the plugs, wires, & number 6 coil. Still have a PO306 code, so I took it to shop to have diagnostic check done and it would not take a crank relearn. Any help ?
07-13-2007, 05:02 PM
#2
A number of conditions have to be met in order for the crank relearn procedure to take place. Maybe the shop missed one of them?
CKP System Variation Learn Procedure-
1. Install the scan tool.
2. Apply the parking brake.
3. Block the drive wheels.
4. Close the hood.
5. Place the transmission in Park if the vehicle has an automatic transmission, or in Neutral if the vehicle has a manual transmission.
6. Idle the engine until the engine coolant temperature reaches HC (150°F).
7. Turn OFF all of the accessories.
8. Apply the brakes for the duration of the procedure.
9. Use the scan tool in order to enable the Crankshaft Position System Variation Learn Procedure.
10. Slowly raise the engine speed to 4,000 RPM.
11. Immediately release the throttle when the engine speed decreases.
12. Turn OFF the ignition for 15 seconds after the learn procedure is completed successfully.
If the crankshaft position system variation learn procedure cannot be performed successfully, inspect for the following conditions and correct as necessary:
- A damaged reluctor wheel
- Excessive crankshaft runout
- A damaged crankshaft
- Interference in the signal circuit of the CKP sensor
- A coolant temperature that is not within the Conditions For Running the
DTC
- The ignition switch is in the ON position until the battery is drained
- A PCM power disconnect with the ignition ON may erase the stored value
and set the DTC P1336
CKP System Variation Learn Procedure-
1. Install the scan tool.
2. Apply the parking brake.
3. Block the drive wheels.
4. Close the hood.
5. Place the transmission in Park if the vehicle has an automatic transmission, or in Neutral if the vehicle has a manual transmission.
6. Idle the engine until the engine coolant temperature reaches HC (150°F).
7. Turn OFF all of the accessories.
8. Apply the brakes for the duration of the procedure.
9. Use the scan tool in order to enable the Crankshaft Position System Variation Learn Procedure.
10. Slowly raise the engine speed to 4,000 RPM.
11. Immediately release the throttle when the engine speed decreases.
12. Turn OFF the ignition for 15 seconds after the learn procedure is completed successfully.
If the crankshaft position system variation learn procedure cannot be performed successfully, inspect for the following conditions and correct as necessary:
- A damaged reluctor wheel
- Excessive crankshaft runout
- A damaged crankshaft
- Interference in the signal circuit of the CKP sensor
- A coolant temperature that is not within the Conditions For Running the
DTC
- The ignition switch is in the ON position until the battery is drained
- A PCM power disconnect with the ignition ON may erase the stored value
and set the DTC P1336
07-13-2007, 09:31 PM
#3
Originally Posted by caddobass
What would cause my 02 SS to not take a crank relearn? Car has been misfireing PO300 & now a PO306. I changed the plugs, wires, & number 6 coil. Still have a PO306 code, so I took it to shop to have diagnostic check done and it would not take a crank relearn. Any help ?
As far as what would keep it from relearning, a misfire would. Also a rev limiter set higher than stock will keep it from relearning.
07-14-2007, 02:20 PM
#4
12 Second Club
Thread Starter
iTrader: (1)
Join Date: Oct 2006
Location: Oil City, La.
Posts: 553
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by edcmat-l1
It doesnt matter if it'll run a crank relearn or not. If its misfiring, fix whats causing the misfire. Not completing the crank relearn will not make it misfire. Now, if its fixed, and it wont relearn, thats a little different. But still not an issue. You can turn that off in the computer.
As far as what would keep it from relearning, a misfire would. Also a rev limiter set higher than stock will keep it from relearning.
As far as what would keep it from relearning, a misfire would. Also a rev limiter set higher than stock will keep it from relearning.
07-14-2007, 02:36 PM
#5
Originally Posted by caddobass
The guy at the shop wanted to start the process of fixing the misfire with a crank relearn, then a smoke test on the intake to look for intake leak. The cause of this misfire has been puzzling.
I been doin this for 20 plus years. I've been a diag specialist 10+ years. The crank relearn is not causing the misfire, nor will it help the misfire to complete it. It will not help in the diagnostic process. I would, as politely as you can, recommend he treat the problem as if it were a car that didnt have to go thru the crank relearn.
Or tell him to call me. ASE master tech for over 15 years. ASE advanced engine performance certified for 12 years. I been doin this forever.
Send me a pm and I'll give you my #.
PS the smoke machine is a good idea. Then scope the ignition. Ask him if he can flow test the injectors. Then if all thats good, time to start looking at the mechanical condition of the motor. Compression, valve springs, rockers, pushrods, etc.
An analytical, methodical approach will pin point it every time.
Trending Topics
07-15-2007, 09:45 AM
#8
Moderator
iTrader: (11)
Join Date: Mar 2002
Location: East Central Florida
Posts: 12,604
Likes: 0
Received 6 Likes
on
6 Posts
Some codes inhibit the crank relearn from running
and I had one that wouldn't even show up on the
Predator, do this. Some fuel system thingy back at
the tank. Dealer fixed it under warranty and I never
got a real good idea of what it was.
If you have a P0306 then check #6, swap ignition
and fuel parts one at a time with #4 until the misfire
moves. I guess start with the injector since electrical
parts are new.
Might see if a cylinder balance test also points out #6
as weak.
and I had one that wouldn't even show up on the
Predator, do this. Some fuel system thingy back at
the tank. Dealer fixed it under warranty and I never
got a real good idea of what it was.
If you have a P0306 then check #6, swap ignition
and fuel parts one at a time with #4 until the misfire
moves. I guess start with the injector since electrical
parts are new.
Might see if a cylinder balance test also points out #6
as weak.
07-16-2007, 07:45 AM
#9
12 Second Club
Thread Starter
iTrader: (1)
Join Date: Oct 2006
Location: Oil City, La.
Posts: 553
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by jimmyblue
Some codes inhibit the crank relearn from running
and I had one that wouldn't even show up on the
Predator, do this. Some fuel system thingy back at
the tank. Dealer fixed it under warranty and I never
got a real good idea of what it was.
If you have a P0306 then check #6, swap ignition
and fuel parts one at a time with #4 until the misfire
moves. I guess start with the injector since electrical
parts are new.
Might see if a cylinder balance test also points out #6
as weak.
and I had one that wouldn't even show up on the
Predator, do this. Some fuel system thingy back at
the tank. Dealer fixed it under warranty and I never
got a real good idea of what it was.
If you have a P0306 then check #6, swap ignition
and fuel parts one at a time with #4 until the misfire
moves. I guess start with the injector since electrical
parts are new.
Might see if a cylinder balance test also points out #6
as weak.
07-18-2007, 01:05 AM
#11
12 Second Club
Thread Starter
iTrader: (1)
Join Date: Oct 2006
Location: Oil City, La.
Posts: 553
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by cainsw
Did you figure it out yet? I have electrical gremlins attacking me now
