throwin codes

**grouch0jr** · 07-05-2009, 12:57 PM

hey, i threw a code last weekend, but didnt get around to checking it till today. p1336 - manufacturer control system misfire. its listed twice, one of them is "pending" and wont let me clear it.

what does this mean and what can i do about it?

http://www.gearchatter.com/viewtopic9118.php

this doesnt seem to help me much

**2001NBMZ28** · 07-06-2009, 07:15 AM

Did the battery die with the ignition on or was PCM disconnected with the ignition on, etc like asked in the link? If it just came on out of nowhere I'd try resetting the PCM manually and see what happens.

**grouch0jr** · 07-06-2009, 03:53 PM

Originally Posted by 2001NBMZ28

Did the battery die with the ignition on or was PCM disconnected with the ignition on, etc like asked in the link? If it just came on out of nowhere I'd try resetting the PCM manually and see what happens.

how do i manually reset the pcm? my engine did not die.

**grouch0jr** · 07-07-2009, 09:07 AM

do you mean just disconnecting the battery?

**2001NBMZ28** · 07-07-2009, 09:58 AM

PCM Reset

Turn key on, don't start car
Pull PCM BATT and PCM IGN fuses in engine compartment
Wait 5-10 min
Turn ignition off
Replace fuses

Idle will be a little erratic until it relearns.

**Melissa@NP** · 07-07-2009, 10:45 AM

Heres some more information on DTC P1336

Originally Posted by RedHeartbeat

The CKP System Variation Learn procedure concerning the relationship of the Crankshaft Postion Sensor, or CKP, to the crankshaft reluctor was introduced in 1997 on some applications and use more broadly in 1998.

DTC P1336 indicates that CKP System Variation is not learned. This learn procedure is needed to compensate for minor variations in manufacturing tolerances that might alter the CKP signal relationship of the crankshaft position sensor to the reluctor wheel, possibly resulting in a false misfire DTC and MIL illumination.

CKP System Variation must be relearned when any of these part are removed or replaced...
1.) CKP sensor
2.) Crankshaft
3.) Engine block
4.) Engine assembly
5.) PCM

If a PCM is replaced without performing the CKP learn procedure, the P1336 will not set and it is possible that a Misfire DTC P0300 might later set falsely. This is due to an incorrect CKP System Variation value being stored in the PCM and being used in misfire calculation.

CKP System Variation is only relearned with a scan tool. It does not relearn on it's own.
1.) Make sure no DTCs are set. If DTCs are set set, service them before performing the procedure.
2.) The service brake must be firmly applied and the transmission in "PARK" for an automatic or "NEUTRAL" for a manual.
3.) The A/C must be "OFF" and the hood closed
4.) At this point, use the Tech 2 and CKP System Variation Learn
5.) Open the accelerator to the identified fuel cutoff speed and release it as soon as the PCM cuts off the fuel and the engine begins to decelerate
6.) The scan tool will identify when the procedure is complete

Diagnostic Aids

If the Crankshaft Position System Variation Learn Procedure cannot be learned, check for the following conditions...
1.) a chipped or damaged reluctor wheel
2.) Incorrect alignment of the CKP sensor to the reluctor wheel
3.) Excessive crankshaft run-out
4.) Interference in the signal circuit to the CKP sensor
5.) Incorrect ratio of crankshaft to camshaft pulses

Functional Check

After performing the Idle Learn procedure and/or the CKP Variation Learn procedure, perform a functional check of the PCM.

1.) Use a Tech 2 to "Capture Info"
2.) Clear Diagnostic Trouble Codes (DTCs), if any are stored
3.) Perform the On-Board Diagnostic System Check
4.) Start engine and let it idle for one (1) minute
5.) Use a scan tool to check for DTCs
6.) Service any DTCs according to service information procedures

**grouch0jr** · 07-09-2009, 08:53 AM

Originally Posted by 2001NBMZ28

PCM Reset

Turn key on, don't start car
Pull PCM BATT and PCM IGN fuses in engine compartment
Wait 5-10 min
Turn ignition off
Replace fuses

Idle will be a little erratic until it relearns.

will this kill my tune? should i replace my stock pcm?

Originally Posted by Melissa@NP

Heres some more information on DTC P1336

i have a code reader, but have no idea what a 'tech 2' is...

**2001NBMZ28** · 07-09-2009, 09:17 AM

Resetting the PCM manually, or disconnecting the battery won't change your tune.

**grouch0jr** · 07-09-2009, 04:27 PM

Originally Posted by 2001NBMZ28

PCM Reset

Turn key on, don't start car
Pull PCM BATT and PCM IGN fuses in engine compartment
Wait 5-10 min
Turn ignition off
Replace fuses

Idle will be a little erratic until it relearns.

ok. i did this. as you mentioned the idle was a little erratic. i waited until the it smoothed out for a few minutes. then i tried to give it some gas. if i gave it just a little the rpms would dip down low, so i turned off the ignition and restarted the car. now its acting fine, but i still have the damn SES light and code.

now what?

do all hand held code scanners do the "On-Board Diagnostic System Check" like the tech 2?

**grouch0jr** · 07-12-2009, 09:06 AM

is this the wrong section for this thread?

i have no idea how to approach this problem...

**2001NBMZ28** · 07-12-2009, 12:14 PM

A code scanner won't help, you need software or a tech2 to do the CKP relearn procedure and see if it takes. A dealership or tuning shop can do it. If the relearn doesn't work something else is wrong. Think gearchatter has a link explaining how to do it, I'll look....

**Frost** · 07-12-2009, 08:55 PM

I only ever see this when people swap PCMs, never seen an OEM PCM/engine combo set this code.

**grouch0jr** · 07-12-2009, 10:48 PM

Originally Posted by Frost

I only ever see this when people swap PCMs, never seen an OEM PCM/engine combo set this code.

i swapped my pcm, had a mail order tune.

ive still got my factory PCM, should i try putting it back in?

**Frost** · 07-13-2009, 04:49 AM

I thought so!

That's THE reason that I don't typically tune via exchange.

You don't even need to test this, if you put the stock one back in, the code will clear. Maybe ask your tuner if he can reflash your OEM PCM with just the data-table part of your tune. Once you get your stock PCM back, switch it back out.

**2001NBMZ28** · 07-13-2009, 07:14 AM

Ah that explains it - a relearn is needed after a PCM replacement according to the link you posted.

**grouch0jr** · 07-13-2009, 08:41 AM

Originally Posted by Frost

I thought so!

That's THE reason that I don't typically tune via exchange.

You don't even need to test this, if you put the stock one back in, the code will clear. Maybe ask your tuner if he can reflash your OEM PCM with just the data-table part of your tune. Once you get your stock PCM back, switch it back out.

Originally Posted by 2001NBMZ28

Ah that explains it - a relearn is needed after a PCM replacement according to the link you posted.

ive had my pcm switched out for about 6 months now. this happened sort of randomly. if it went on due to a pcm replacement, wouldnt the light have gone on immediately when i installed it?

**Frost** · 07-13-2009, 10:54 AM

I have seen it pop late like yours did. There are differences in setup to setup in the reluctor's signal back to the PCM. This procedure 'marries' the PCM to your reluctor and pickup.

If you don't want to have your tuner load your original PCM, you will have to go to a dealership (some tuners can do it too) and have a crank-relearn performed with a TechII. It should be $100 or less.