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Autometer Air Fuel gauge faulty?

boomnvn

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Hey all, fitted my Autometer air fuel ratio gauge into my VT V6 auto tonight, and encountered a problem of numerous LED's lighting up at once. Has anyone come across this before?

It's the same when the engine is stopped as well as running.

I've wired up the oxy sensor wire to pin D15 (violet) according to here -> http://memcals.com/pdf/VTV6 Auto Wiring Diagram.pdf and pos/neg are supplied from the cig lighter.

The gauge is second hand, and was working when it came out of my mate's car as well.. I did test it outside the car and it worked ok (went straight to the richest green LED), then installed and now have this problem.

Has anyone here encountered this?

Cheers,
Spudley.
 

axemurderer101

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when you tested it out of the car did you have the o2 sensor wire connected with just the positive and negative? when i had one in my vs it did the same thing wher one led would be bright and a couple of the ones around that one were a little dull.
 

boomnvn

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nope, I had all 3 wires connected outside the car and was working.
can anyone confirm if the D15 (purple) wire is the correct wire to hook it up to, in the VT V6 auto? (link above for pinout)
 

IBLOWN

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ALL the connections have to be DEAD clean and connected the abosulte best you can. Must use solder. The guage is very sensitive and really only 1 LED should be lit at one time.
 

boomnvn

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thanks mate. didn't have the soldering iron at home when i did it, but will fix that up and see what happens :)
 

boomnvn

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ok i've soldered the joints and I'll post a vid soon of what's happening..
I can see there's one dead LED in the orange area but that doesn't bother me, I just wanna make sure it's wired correct for when I eventually replace it.

can anyone actually confirm if i'm even connecting to the right wire at the ecu?
 

boomnvn

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IBLOWN

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Thats pretty good. Thats about how they look, same as mine. I would still use solder and use a really good earth.

Dunno why that LED isnt working though. Is it new?
 

boomnvn

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nah not new, got it from my mates car when he parted out. it was working when we removed it but it's been kicking about for about a year so i'm not surprised it has a damaged led...

it's more that when cruising at under 2k rpm, it just like bounces from red to green and not sure if it's supposed to do that. under hard acceleration it goes to the rich end, and to lean upon backoff, but any other time it just bounces.

cheers.
 

Cheap6

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Sounds normal. Closed loop - steady cruise and light load - the A:F mixture oscillates either side of stoichiometric, accel. goes rich, decel fuel cuts off or at least leans out.
 
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