Apexi Neo AFC Help
Apexi Neo AFC Help
James S Right, have tried what rabster has suggested, by trying the unit straight off the battery. And the unit still reads 3.94v so am at a loss. Maybe there is a problem with the unit?
3.9v suggets to me that you are using a power source for a sensor as opposed to direct 12v feed.
Funny that I've had a brand new one here for years. Just connected to battery and no joy.
FunkMasterJay
19-03-2018, 06:33 AM #41James S Right, have tried what rabster has suggested, by trying the unit straight off the battery. And the unit still reads 3.94v so am at a loss. Maybe there is a problem with the unit?
3.9v suggets to me that you are using a power source for a sensor as opposed to direct 12v feed.
Funny that I've had a brand new one here for years. Just connected to battery and no joy.
Quote:ALL VFD ELECS - MY SCREEN ILLUMINATES BUT MY BUTTONS DON’T, WHAT CAN I CHECK? The most common cause of either the display or buttons not illuminating is related to the grounding wires that much be separated by at least one-half inch.
I know thats not your issue, but it does seem to have a big effect on the unit
EDIT:
Oh and one more thing that might be worth checking is if the plugs that connect the NEO's short harness to the long engine bay harness are OK? I.E measure the voltage going to the NEO side of the harness?
Have a go at running both neo positives off the battery, but putting the neo ground wires at different points in your engine bay. The Neo manual and Apexi website are quite specific on making sure that the ground points are at least 1 inch apart.
Quote:ALL VFD ELECS - MY SCREEN ILLUMINATES BUT MY BUTTONS DON’T, WHAT CAN I CHECK? The most common cause of either the display or buttons not illuminating is related to the grounding wires that much be separated by at least one-half inch.
I know thats not your issue, but it does seem to have a big effect on the unit
EDIT:
Oh and one more thing that might be worth checking is if the plugs that connect the NEO's short harness to the long engine bay harness are OK? I.E measure the voltage going to the NEO side of the harness?
Its out the car at the min. Think I might just get it up on Ebay, might have one more try wiring it in. But to be honest I think its a bit beond me.
My currenty thought is that the fact the unit has four wires for power, two poss/two neg. Could these be needed to connect to different parts of the power wiring circuit? I.e. one wire pulling pre-ignition power and the other drawn off the ECU power.
Thought about connecting one of the grounds to the car earth rather then the ECU earth, but would have thought this should have been mentioned in the instructions.
Just to re-cap the problem though. I think because the unit isn't powering properly, the memory on the unit is still full of Jimxms's IS300 data, and the unit can't rewrite this untill on full power. Either that or something has blown inside the AFC if I have connected it to the wrong wire at some point.
Spent the last hour or so trawlling through google trying to find someone with a similar problem. With no joy.
I have checked the harness today with a multi-meter, run off the ECU, and managed to get 12v on each of the terminals.
My currenty thought is that the fact the unit has four wires for power, two poss/two neg. Could these be needed to connect to different parts of the power wiring circuit? I.e. one wire pulling pre-ignition power and the other drawn off the ECU power.
Thought about connecting one of the grounds to the car earth rather then the ECU earth, but would have thought this should have been mentioned in the instructions.
Just to re-cap the problem though. I think because the unit isn't powering properly, the memory on the unit is still full of Jimxms's IS300 data, and the unit can't rewrite this untill on full power. Either that or something has blown inside the AFC if I have connected it to the wrong wire at some point.
Spent the last hour or so trawlling through google trying to find someone with a similar problem. With no joy.
As for 2 positives, that makes plenty of sense for most in-car devices - one permanent live and one ignition live, the same as you have on car stereos. This is basically because the ignition 'on' circuit isn't meant to have much power drawn over it, it's just meant to switch on relays and low current devices. Other devices just use this signal as a 'turn on' signal and draw their main power from the battery.
That's all very generic information though, I don't know the ins and outs of the AFC itself.
It's a bit of a funny one because you are playing with sensors. Sensors have to have clean grounds/negative connections to read accurately, so (unlike any other part of the electrics in the car) they don't ground to the car chassis but the ECU runs a separate grounding circuit for them. The AFC's 'altered' response from the MAP sensor would have to be on this circuit otherwise you could create a ground loop which would muck up the signal, so I presume one of the grounds is going to form a power circuit for the AFC device itself, and the other is to become a part of the 'closed' sensor/ECU circuit.
As for 2 positives, that makes plenty of sense for most in-car devices - one permanent live and one ignition live, the same as you have on car stereos. This is basically because the ignition 'on' circuit isn't meant to have much power drawn over it, it's just meant to switch on relays and low current devices. Other devices just use this signal as a 'turn on' signal and draw their main power from the battery.
That's all very generic information though, I don't know the ins and outs of the AFC itself.
The Apexi site has very little info on it. It could do with a forum or something similar to ask about set up options. I have found a local garage that have a rolling road for power tuning. I shall give them a call see if they have any experience using an AFC, but they are closed today.
Yeah, the thing is though, this is real basic. I am simply trying to get the power into device. Not even touching the sensors at the min.
The Apexi site has very little info on it. It could do with a forum or something similar to ask about set up options. I have found a local garage that have a rolling road for power tuning. I shall give them a call see if they have any experience using an AFC, but they are closed today.
The only thing I've noticed is that from the manual it says that the power and ground wires are connected 1cm apart on the same wires, in a specific order (i.e. one closer to the ECU than the other). It's also very clear about not connecting them to the chassis ground. That leads me to think that they are doing something more specific than just powering the unit, and they are *very* clear that it won't function properly unless connected up like that.
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