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throwin codes

This is a discussion on throwin codes within the Computer & Tuning forums, part of the LSx Technical Help Section category; hey, i threw a code last weekend, but didnt get around to checking it till today. p1336 - manufacturer control ...

  1. #1
    Senior Member grouch0jr's Avatar
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    throwin codes

    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

  2. #2
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    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.

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    Senior Member grouch0jr's Avatar
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    Quote Originally Posted by 2001NBMZ28 View Post
    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.

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    Senior Member grouch0jr's Avatar
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    do you mean just disconnecting the battery?

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    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.

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    Heres some more information on DTC P1336
    Quote Originally Posted by RedHeartbeat View Post
    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

  7. #7
    Senior Member grouch0jr's Avatar
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    Quote Originally Posted by 2001NBMZ28 View Post
    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?

    Quote Originally Posted by Melissa@NP View Post
    Heres some more information on DTC P1336
    i have a code reader, but have no idea what a 'tech 2' is...

  8. #8
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    Resetting the PCM manually, or disconnecting the battery won't change your tune.

  9. #9
    Senior Member grouch0jr's Avatar
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    Quote Originally Posted by 2001NBMZ28 View Post
    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?

  10. #10
    Senior Member grouch0jr's Avatar
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    is this the wrong section for this thread?

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

  11. #11
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    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....

  12. #12
    TunedbyFrost.com Tuner Frost's Avatar
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    I only ever see this when people swap PCMs, never seen an OEM PCM/engine combo set this code.

  13. #13
    Senior Member grouch0jr's Avatar
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    Quote Originally Posted by Frost View Post
    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?
    Last edited by grouch0jr; 07-13-2009 at 04:08 AM.

  14. #14
    TunedbyFrost.com Tuner Frost's Avatar
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    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.
    Last edited by Frost; 07-13-2009 at 06:21 AM.

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

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    Senior Member grouch0jr's Avatar
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    Quote Originally Posted by Frost View Post
    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.
    Quote Originally Posted by 2001NBMZ28 View Post
    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?

  17. #17
    TunedbyFrost.com Tuner Frost's Avatar
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    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.

  18. #18
    Veteran Hi-Po's Avatar
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    Kind of off topic, and im sorry

    What can a Tech II do that HP Tuner cant? It cant have nearly as good of a scanner can it?

  19. #19
    TunedbyFrost.com Tuner Frost's Avatar
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    The TechII is GM's diagnostic and PCM tool for our cars. HPTuner's can also do a relearn, but you need to have some patience with it

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