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How to tell if the VVL solenoids are on

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  • How to tell if the VVL solenoids are on

    This is a really stupid question I know. I have in my haltech elite the solenoids "active state High" "driver type high side" and at idle they make no difference (sound wise) at idle when I have them "active". Shouldn't they induce a lope when they are activated at idle since I would be on the high cams? The Ecu is showing them activated, but now I'm super confused to say the least.

    Things I've already checked.

    -wiring - good. One wire on each grounded to the head, the other wire is fed by the output from the Ecu. Hence they are going "active" as programmed.

    -I've confirmed the routing of the lines, the solenoids are correct from images I've reviewed. Anyone with experience please input.

  • #2
    You should hear a loud click when they activate (sitting in front of the engine bay that is).

    www.2LiterTurbo.com (Personal Site)
    96 240SX SE: Track Car | 90 Skyline GTR: Bucket List Car | 07 Legacy Spec B: The DD

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    • #3
      Yeah I figure I'll pull the block and test the solenoids off the car and then check the activation from the Ecu/harness actively to see if it's that the Ecu isn't driving with enough amperage. The output is a 1A.

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      • #4
        That's not enough, the solenoids are ~7 ohms.

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        • #5
          Oh snap

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          • #6
            Can the solenoids be powered independently of the ECU??

            For anything that needs an independent source, I bought a 0-18 Volt/0-3A power supply from Amazon and power then up to the required voltage and test the solenoids or whatever apparatus I am testing.

            May be worth a thought, unless you can use the standalone to set solenoid activation (RPM activation for example with RPM @ 0 RPM or something like that for instance).

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            • #7
              Yeah it can do it, but per his input of them being 7 ohms I would need almost 2 amps per output. The outputs I'm using are 1amp max.

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              • #8
                Aren't the solenoids independent?? If so, can't you power them individually??

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                • #9
                  You can, but a lot of people don't.

                  www.2LiterTurbo.com (Personal Site)
                  96 240SX SE: Track Car | 90 Skyline GTR: Bucket List Car | 07 Legacy Spec B: The DD

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                  • #10
                    I would definitely run these off a relay. That's how I have mine setup.

                    In general the only direct loads my ECU sees are relays and then LEDs and really low current stuff like that.
                    '18 Chevrolet Volt - Electric fun hatch for DD duty!


                    DefSport Koni Sleeve and Spring Perch Buy!!!
                    http://www.nissanroadracing.com/showthread.php?t=5902

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                    • #11
                      Originally posted by RalliartRsX View Post
                      Aren't the solenoids independent?? If so, can't you power them individually??
                      Yes, they are and they are always powered, your enabling a ground to switch them on, therefore whatever you use has to sink around 2A each.

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                      • #12
                        BEXE - Disconnect your solenoid plug and measure the impedance between the pins, Ive seen and read anywhere from 7-13 ohms. My comment above (2A each) is the safe number.

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                        • #13
                          Yeah I disconnected the common ground and changed it to a supplied 12v 10amp. Then changed the haltech for signal ground. @ roughly 50 psi and 1500 rpm they kicked in fine. They won't kick at idle due to the lack of pressure.

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                          • #14
                            Make sure it's not leaking oil inside the solenoid plug. it's common for them to go bad that way too.

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                            • #15
                              I figured out I had the supply/trigger wired wrong due to the haltech having low amp outputs. It could have possibly been the beers I had while wiring and it being late at night. They work now though. Crossing my fingers I'm in town next Friday for some dyno time.

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