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Thread: M2-ATX cuts right after ignition is turned off.

  1. #1
    riv
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    M2-ATX cuts right after ignition is turned off.

    When ignition goes off - PSU immediate halts. The same time, when I put the switch in between ignition and system - it works right, also I tied to connect the system directly to battery power (both - red and white) and it worked fine too, so there is no primary power outages. Any idea what could cause this issue?

    The PSU is configured to 10 min for shutdown and I believe 30 minutes or so for hard off. The same was for 30 sec + 2 hours

    Funny that the USB ports still are getting a power supplied, as I can see the led on the power hub is on (no external power to the hub is connected). So it sounds to me something signaled to the PSU cut the power but keep 5V supply to the motherboard.

    Maybe something related to the specifics of the car? I have Nissan Pathfinder 2001.

    It is the second M2-ATX with the same behavior:

    Another issue which I notice - second power supply give me 12V for AMP, but as soon as I connect to the amp - it drops to ~ 5V, which is not enough to turn the amplifier, previous power supply handled to turn it on. I tried to connect to automobile relay (30A/40A, which requires 12V and not more then 100mA) - no luck, the same time simple 12V LED lighted successfully on AMP pins). Any ideas?

  2. #2
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    Quote Originally Posted by riv View Post
    When ignition goes off - PSU immediate halts. The same time, when I put the switch in between ignition and system - it works right, also I tied to connect the system directly to battery power (both - red and white) and it worked fine too, so there is no primary power outages. Any idea what could cause this issue?

    The PSU is configured to 10 min for shutdown and I believe 30 minutes or so for hard off. The same was for 30 sec + 2 hours

    Funny that the USB ports still are getting a power supplied, as I can see the led on the power hub is on (no external power to the hub is connected). So it sounds to me something signaled to the PSU cut the power but keep 5V supply to the motherboard.

    Maybe something related to the specifics of the car? I have Nissan Pathfinder 2001.

    It is the second M2-ATX with the same behavior:

    Another issue which I notice - second power supply give me 12V for AMP, but as soon as I connect to the amp - it drops to ~ 5V, which is not enough to turn the amplifier, previous power supply handled to turn it on. I tried to connect to automobile relay (30A/40A, which requires 12V and not more then 100mA) - no luck, the same time simple 12V LED lighted successfully on AMP pins). Any ideas?
    Has your custom pic arrived yet? I am hoping that my code will fix your shutoff issue because shutdown is implemented more precisely and after the button press the psu will wait for the mobo to signal to cut power. If the psu does cut power without a graceful shutdown, at least it will tell you why. It also includes a debounce time so fluctuations on the 12V supply line should not have an effect unless they cause the pic on the m2 to lose power completely. The reason that your usb hub is staying on is because the psu can power the 5V standby rail separately. Please let us know when it arrives and you get a chance to test it. If you can get to your pc case it should only take a minute to replace the pic.

    Also, what model amp are you using? I am powering the remote input of 2 amps with the m2 by using a relay, so I may be able to help double check your wiring.

  3. #3
    riv
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    How will it tell me/diagnoses, any guides?

    I will replace the PIC hopefully next week and do the diagnoses. I just have max Mon-Thu for that, as Friday I am leaving for vacation and will be only available after new year holidays.

    Amp - I am using original OEM Nissan Pathfinder model, which I believe some sort of Boss. It requires (measured) about 100mA to kick it and less then 50mA for run on the ignition pin. I tried to connect it to simple automotive relay, which you can get on ebay and which rated to 30A/40A, 12V. The relay is required something like 30mA for run on coil.... again no luck. What heck is it ? I give me ~12V when nothing is connected to it, but as soon as I connect AMP pins to even single LED - it drops to ~5V on them? I already purchases "project" relays which is rated 5V-13V for the coil, it will arrive from Hong Kong after new year.

  4. #4
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    I seem to have the same issue (or similar) with my M2-ATX. When the ignition is switched off the power is cut to the PSU but the strange thing is the power LED on the case is flashing when this happens.

    Any ideas as to what would cause this type of behavior?

  5. #5
    Low Bitrate dvwjettaiii's Avatar
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    I've been having the same problem for a long time now. Though I noticed that when I turn off the ignition, the PC attempts to hibernate but power gets cut and there is some sort of oscillation running through the system. I can tell because the CPU fan pulses for about 30 seconds after power is cut. Everything works fine on the test bench. Last night I decided to completely isolate the PC from my other audio amplifiers, HD radio, and monitor. It turns out that one of my audio amplifiers was causing the problem. Once I removed it, the pc hibernates perfectly. The amp was lousy anyway and I had plans on taking it out, so no loss for me.
    NOTE: I tried the diode trick earlier but that didn't do it for me.

  6. #6
    Newbie Exstatica's Avatar
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    I have this same problem. I've been contemplating on getting a new power supply, but I'm going to try and hook up the ignition to a relay and then the psu to the relay for the start. I've been having some problems with powered usb hubs not working correctly because they don't get powered off all the time.

    I also needed to solve the problem with my power ant. I have an HD radio and never been able to use it.

    I'll let you know how it goes.
    2002 Toyota 4Runner CarPC aptly named WhoreRunner

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