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Thread: Camshaft Position Sensor

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    Camshaft Position Sensor

    Hey does the l61 have a cps?
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    From my understanding, only in the 2007+ L61s.

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    So the l61 doesnt have sequential fuel injection?
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    You have made a jump from one topic to another there.

    Every Ecotec has multi port (sequential as you say) injection. But before this year, it did it using a GM system called Waste-Spark, Compression Sense Ignition.

    Read this:

    http://www.findarticles.com/p/articl...69461#continue

    That describes the system.

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    Yes 2007 L61's have a camshaftp sensor(CMP, not CPS)
    2000-2006's used the ignition module to determine cam position.

    Fuel control is based off the crankshaft position sensor, one of severl reasons GM switched to a 58x resolution crank trigger in '07 for all ECO's (the 00-06 L61's were only 7x resolution)
    I know stuff about ECOTECS

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    Maven, would U mind explaining why they switched the cmp and the resolution crank trigger in 07+? Are there benefits?
    Car Previously Owned: 2002 Pontiac Grand Am 2.2L Ecotec 5 speed SOLD
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    The original desigin was based on mechanical simplicity. It works perfectly well in fact. You do get a higher level of control with a traditional crank and cam sensor. GM wanted to switch to a coil-on-plug ignition along with other things with the current model, which required the change.

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    58x and an actual cam sensor provide benefits of quicker start times and reduce amount of time the fuel control system is "guessing" on what injector to fire, realize were talking in the fraction of a second range when talking about shorter or longer crank times. Having both sensors also provides redundancy in case of failure, if a 7x L61 loses its crank sensor signal it wont run. If a 58x/CMP L61 loses its crank signal it can still run. 58x also gives better diagnostic capabilites as the ECM is able to more accurately diagnose misfires. Switching to 58x also brings all ECOs in USA(except Saab) to the same fuel/ignition control strategies and even aligns these engines with all other current new generation gasoline engines in the USA from the Z06's LS7 all the way down to the 1.2L Aveo/G3(Canada) engines.


    Also CSI(what the 00-06 L61's ignition type is called) requires tight electrical tolerances in all four spark plugs and coils which operate under constantly changing conditions and extremely high potentially unstable temperatures(which affects resistance) and in extremely close proximity to very high electromagnetic interfernce. A cam sensor lives in the head resulting in much lower temps and has only 3 wires which are (relatively speaking) in a pretty nice stable environment.
    Last edited by maven; 04-13-2007 at 02:56 PM.
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    The original desigin ....... It works perfectly well in fact.
    Halfcent Quoted Post
    True, well but not precisely enough.


    You do get a higher level of control with a traditional crank and cam sensor.
    100%

    GM wanted to switch to a coil-on-plug ignition ....... which required the change.
    Basically. The 58x and its imporved diag capabilites and reduced start times and greater accuracy of fuel/spark control(emissions) are what GM was after, once you switch to the 58x CKP/CMP system its pretty much pointless to a waste spark system. So the C-O-P goes with the 58x not the other way around, but Halfcent got it damn near 100 cent.
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    Ok now doesnt megasquirt use the same system to control their ignition? And thats why the 96-99 2.4 had to switch to the old style coil setup to run megasquirt? Ohh and Im not switching subjects I'm just doing some reserach.
    Last edited by sayno2vtec; 04-13-2007 at 06:03 PM.
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    Most aftermarket ECM's (standalones) will require a cam and crank signal to operate. Hence the reason people have a lot of trouble using piggybacks on this car.

    MSD does make the necessary parts to produce a cam and crank signal from an Ecotec. However, in doing so, you now make the factory ECM unable to run the engine, which creates a whole other problem.

    MSD is said to be working a system that would replace the stock ignition coil pack. They use their cam trigger system that is in the distributor they make for the Ecotec and attach it to a new Ignition control module. The trigger signal then replaces the CSI signal at the module. Then, as a result, the coil pack can also be replaced with a traditional COP. I would love to see this happen, but so far MSD has not produced it.

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    But, megasquirt is designed to run timing off the crank signal and controls the injectors through the ignition coil. Me and a friend were discussing this and we came to the conclusion that the only difference between the way megasquirt runs the injectors and the way the ecotec runs the injectors is that the ecotec ecu is programmed to run the four injectors seperatly(sequential) off the one ignition signal and megasquirt cant untill they design a circuit thats able to utilize the one reference signal and run all four injectors...correct?...Hence having to install the old style ignition system to run megasquirt...correct?
    It'S OFFICIAL IM NOW AN ECOTEC OWNER ....
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