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Thread: AEM 30-0334-type direct OBDII wideband for older vehicles. Any takers ?

  1. #21
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    Any changes on PIN-6 ? or PIN-10 (if present )

    I can detect the battery voltage > 13v to know when the engine is running. But, I still do not know how to tell when the IGN in in RUN or ACC.

    This would be fine, except that I think people would want their gauges to turn on, with the key. I know how to make the gauge wait until the engine starts, to start heating up the sensor. And, I can, eve, let one of the gauge buttons override the wait state.

    My worst case scenario is to wake the device up, once, every second or so and, query the ECU state. Then, go back to sleep... Functional, but, not a good look

  2. #22
    I have 4 wires pinned into my 2004 Silverado OBDII port

    PIN-2
    PIN-4
    PIN-5
    PIN-16

    I ignored PIN-2 because what I looked up described it as "Serial Data Link - Class 2 - Purple"

  3. #23
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    That's what I figured. PIN-2 would be the one to look at, then. Looking for some change, when the ECU powers up.

    I did, BTW, decide to go ahead and add the power terminals, for the WBs.

  4. #24
    Okay, so I checked PIN-2 (Using PIN-5 as a ground) and found a few things. I don't know how this PIN normally reads, but what I found is that maybe VATS seems to "wake up" whatever is on PIN-2....

    Truck totally at rest with no key in the ignition - 0.00v

    Sliding the key into the ignition results in a "surge" (for lack of a better term, I'll use surge) of about 1.36v, and then settles down to around 0.31v

    Key just sitting in the ignition, with the ignition OFF will yield somewhere close to 0.31v

    Changing the key from the OFF, to the ON position (engine off), voltage will surge to around 3.83v and then settle back to 0.46v to 0.51v

    Going from key OFF, to cranking, and RUN (normal start) will yield a surge in voltage around 3.74v to 3.91v and then it will settle into a constantly changing range of 0.38v to 0.69v while the engine is running

  5. #25
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    Interesting Maybe I can add an A/D on PIN-2. And, add a wake-up mode, when the value is over 200mv

    Good data. I will get my 2002 2500HD back next week. I will see if this is consistent.

    thanks

    -mike

  6. #26
    Sounds good. I also have a 99 Silverado here with a 2002 2500HD PCM and a 6.0L 4L80E swap. I will be working on the tune tomorrow. Checking the readings on it shouldnt be a problem for a 3rd source

  7. #27
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    It would be really great if someone with a Ford 1996-2007 (J8150-PWM) vehicle could check the state of PIN-10 with the key off vs. on.

    Additionally, it would be nice to know the resistance between PIN-2 and PIN-10 WITH THE IGNITION OFF, going both ways.

    I am guessing that PIN-10 goes to 2.5v to 5.0v, when the ignition is on ? That would help immensely
    Last edited by dr.mike; 2 Weeks Ago at 03:29 PM.

  8. #28
    Dr Mike has this progressed any?

  9. #29
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    Yes. I have the initial electronics design done. I got the simulators for the J1850 VPW( GM/MOPAR) and PWM(FORD) ECUs.

    It looks like I will need to go to a slightly larger housing, to accommodate the extra terminals for the WB power wires. But, it's only about 1/2" difference.

    I also got my 2002 2500HD back to verify the voltage readings on the OBD2 port, for wake-up conditions.

    I am still looking for someone with a 1996-2006 Ford, to check the wake-up conditions for the PWM type ECUs.

    So far, so good.

  10. #30
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    I just did some testing on the Chevy 2500HD. It looks like I can pull a good wake-up signal from the OBDII port.

    So, i should be good to finish up the electrical design