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Erased trouble codes. Now it won't start

This is a discussion on Erased trouble codes. Now it won't start within the Technical / Maintenance forums, part of the General Discussion category; I bought a pocket obd2 scanner from autzone and came home and erased the codes from my 97 2500 350 ...

  1. #1
    Registered User ovrebo1's Avatar
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    Unhappy Erased trouble codes. Now it won't start


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    I bought a pocket obd2 scanner from autzone and came home and erased the codes from my 97 2500 350 vortec and now the truck wont start

  2. #2
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    Re: Erased trouble codes. Now it won't start

    What did the codes say?
    Is it cranking?
    If so check to see if you have fuel and fire.


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    Registered User dave89iroc's Avatar
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    Re: Erased trouble codes. Now it won't start

    if one of the codes was a cam sensor code, it won't start till the problem is fixed now

    when it looses the cam referance, it sets the code and goes to a default, but if the code is cleared, it goes back to normal, and without a cam ref., it won't start
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    Registered User ovrebo1's Avatar
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    Re: Erased trouble codes. Now it won't start

    it showed codes P:0107 0122 1345

    there is one little connector on the passengers side with three pins that I dont know what it is saposed to be connected to. could it have anything to do with the cam sensor

  5. #5
    Registered User ovrebo1's Avatar
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    Re: Erased trouble codes. Now it won't start

    here is the connector that isnt connected to anything


    Is this the crank position sensor or the cam sensor

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    Registered User dave89iroc's Avatar
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    Re: Erased trouble codes. Now it won't start

    Quote Originally Posted by ovrebo1
    here is the connector that isnt connected to anything


    Is this the crank position sensor or the cam sensor
    second pic is the crank sensor


    cam sensor is in the distributor, feel at the back of it, just below the cap, see if it is plugged in


    also, see if the MAP sensor is plugged in(small square 1x1" plastic on top of the plastic part of the intake manifold


    also, heck to see if the coil and ICM are plugged in




    if none of those, tell me what color wires are in the connector
    Last edited by dave89iroc; 03-15-2008 at 04:52 PM.
    ASE Master Certified Technician

    2000 Silverado 6.0 4L80E 2wd
    *RIP*1994 Z71 SCLB 355, Dart Heads, 10.5:1 CR, PM rods, CC XR270HR

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    Registered User ovrebo1's Avatar
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    Re: Erased trouble codes. Now it won't start

    Are any of these code MAP or cam sensor codes P:0107 0122 1345

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    Registered User dave89iroc's Avatar
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    Re: Erased trouble codes. Now it won't start

    Quote Originally Posted by ovrebo1
    Are any of these code MAP or cam sensor codes P:0107 0122 1345
    P0107 is MAP sensor low voltage
    P0122 is TPS low voltage
    P1345 is CMP/CKP correlation


    DTC P1345 Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation

    Circuit Description
    This diagnostic trouble code (DTC) monitors the crankshaft position (CKP) and the camshaft position (CMP) signals to determine if they are synchronized. If both signals are not observed by the control module within a narrow time window, the vehicle control module (VCM) will determine that an error has occurred.

    Conditions for Running the DTC
    The engine is running

    Conditions for Setting the DTC
    When the engine is running, the cam sensor reference pulse is not detected at the correct position relative to the crankshaft position sensor pulse.

    Action Taken When the DTC Sets
    The control module illuminates the malfunction indicator lamp (MIL) the first time the diagnostic runs and fails.
    The control module will set the DTC and records the operating conditions at the time the diagnostic fails. The control module stores the failure information in the scan tools Freeze Frame/Failure Records.
    Conditions for Clearing the MIL or DTC
    The control module turns OFF the MIL after 3 consecutive drive trips when the test has run and passed.
    A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles. A warm-up cycle occurs when the coolant temperature has risen 22C (40F) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 70C (158F) during the same ignition cycle.
    Use a scan tool in order to clear the DTCs.
    Diagnostic Aids
    Check the following items:

    A loose CMP sensor causing a variance in the sensor signal
    Excessive free play in the timing chain and gear assembly
    Incorrectly installed distributor - 1 tooth off in either advance or retard positions
    A loose distributor rotor on the distributor shaft
    A loose or missing distributor hold down bolt
    An intermittent may be caused by any of the following conditions:

    A poor connection
    Rubbed through wire insulation
    A broken wire inside the insulation
    ASE Master Certified Technician

    2000 Silverado 6.0 4L80E 2wd
    *RIP*1994 Z71 SCLB 355, Dart Heads, 10.5:1 CR, PM rods, CC XR270HR

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    Registered User ovrebo1's Avatar
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    Re: Erased trouble codes. Now it won't start

    1st so do you think if I turned the distributor while someone cranked it I could get lucky and it might fire

    2nd If the Timing chain is extremely loose will it cause everything to not be allighned and not start is what you are saying

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    Re: Erased trouble codes. Now it won't start

    Quote Originally Posted by dave89iroc
    if one of the codes was a cam sensor code, it won't start till the problem is fixed now

    when it looses the cam referance, it sets the code and goes to a default, but if the code is cleared, it goes back to normal, and without a cam ref., it won't start
    Not true. I had a cam sensor code for 6 months. Started everytime.
    97 Gmc Sierra 1500
    Current mods: Flowmaster 40's, K&N FIPK, S10 converter, wait4me tune, LT1 fans, 2" drop shackles, Alpine CDA-9856 head unit.

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    Registered User dave89iroc's Avatar
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    Re: Erased trouble codes. Now it won't start

    Quote Originally Posted by dalejrfan8
    Not true. I had a cam sensor code for 6 months. Started everytime.
    did you ever clear the code with a scanner?
    ASE Master Certified Technician

    2000 Silverado 6.0 4L80E 2wd
    *RIP*1994 Z71 SCLB 355, Dart Heads, 10.5:1 CR, PM rods, CC XR270HR

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    Re: Erased trouble codes. Now it won't start

    Probably about 50 times. But it would come right back.
    97 Gmc Sierra 1500
    Current mods: Flowmaster 40's, K&N FIPK, S10 converter, wait4me tune, LT1 fans, 2" drop shackles, Alpine CDA-9856 head unit.

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    Registered User ovrebo1's Avatar
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    Re: Erased trouble codes. Now it won't start

    1st so do you think if I turned the distributor while someone cranked it I could get lucky and it might fire

    2nd If the Timing chain is extremely loose will it cause everything to not be allighned and not start is what you are saying

  14. #14
    loose nut behind da wheel JeremyB's Avatar
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    Re: Erased trouble codes. Now it won't start

    Did you have an intake manifold gasket replaced sometime recently before the P1345 code showed up? If you haven't had the gasket replaced and haven't tried to time the vehicle by turning the distibutor, the distributor gear may be worn and needs replaced. One way to check to see if it close is to get the motor to tdc on the compression stroke of cylinder 1 and see where the rotor is pointing. Here is another thread with a picture of where the rotor should point at tdc #1 http://www.fullsizechevy.com/forums/...r-install.html

  15. #15
    Registered User ovrebo1's Avatar
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    Re: Erased trouble codes. Now it won't start

    I had the manifold off and the gasket looked fine. It wasn't hard or anything. I'm going to crank the truck over while turning the distributor today.

  16. #16
    loose nut behind da wheel JeremyB's Avatar
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    Re: Erased trouble codes. Now it won't start

    Do it as I described in the other post, or at least check rotor position before messing with the distributor, if its way off you could cause engine damage

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    Registered User ovrebo1's Avatar
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    Re: Erased trouble codes. Now it won't start

    which way does the rotor turn so i make sure to turn it the opisit way to advance it first

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    Registered User dave89iroc's Avatar
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    Re: Erased trouble codes. Now it won't start

    Quote Originally Posted by ovrebo1
    which way does the rotor turn so i make sure to turn it the opisit way to advance it first
    rotor turns cw
    ASE Master Certified Technician

    2000 Silverado 6.0 4L80E 2wd
    *RIP*1994 Z71 SCLB 355, Dart Heads, 10.5:1 CR, PM rods, CC XR270HR

  19. #19
    Registered User ovrebo1's Avatar
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    Re: Erased trouble codes. Now it won't start

    Quote Originally Posted by dave89iroc
    rotor turns cw
    thanks

  20. #20
    Registered User ovrebo1's Avatar
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    Re: Erased trouble codes. Now it won't start

    I advanced the distributor and it fired right up. It still gives me a code 0107

 

 
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