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Air / Fuel Ratio gauge wiring... 

 

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 Post subject: Air / Fuel Ratio gauge wiring...
Posted: Wed Oct 04, 2006 8:32 am 
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i bought an air / fuel ratio gauge for my EB..theres one signal wire on the gauge but theres 3 wires on the oxygen sensor.....which wire do i connect the signal wire to....thanks...
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Posted: Wed Oct 04, 2006 6:41 pm 
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may need a bit of detective work. one wire will be earth. one will be the signal wire, with a multimeter you should get less than a volt. you need to run the gauge in parralell with the ecu

oh and the other will be a heating coil wire 50w of heat. 12v for 2 mintues when the engines cold. DONT HOOK IT UP TO THIS ONE!!!

 

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Posted: Wed Oct 04, 2006 6:45 pm 
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or tap in at the ECU

 

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Posted: Wed Oct 04, 2006 7:29 pm 
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Yeah tap into the ecu man.

One will be a +12v wire
One will be a HEGO signal
One will be a HEGO GND

+12v to an acc power source.

HEGO signal to the HEGO signal wire in the ECU loom

HEGO GND tol HEGO ground wire in the ECU loom (<--- VERY IMPORTANT. DO NOT JUST USE ANY GROUND)

 

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Posted: Wed Oct 04, 2006 7:43 pm 
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umm...how the hell do i find those wires in the ECu
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Posted: Wed Oct 04, 2006 7:49 pm 
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take the ECU out, the numbers are written above the pins.
The wire you need for the oxy sensor with have a voltage output between 0-1V
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Posted: Wed Oct 04, 2006 7:54 pm 
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Look it up on a chart of the wiring loom, then find the appropriate wire number.

 

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Posted: Wed Oct 04, 2006 8:50 pm 
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4.9 EF Futura wrote:
HEGO GND tol HEGO ground wire in the ECU loom (<--- VERY IMPORTANT. DO NOT JUST USE ANY GROUND)


hmmm, this could explain my funny a*** readings on my AFR gauge, i just tapped into the ECU ground for mine

 

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Posted: Sat Oct 07, 2006 2:26 am 
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so has anyone got a straight answer i need the info for an EL

which wire goes where ??

 

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Posted: Sat Oct 07, 2006 10:06 am 
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on the EB (duno if EF is the same) theres a green wire with a blue stripe on it...thats the feed wire...your gauge should have 3 wires on it...ones an ignition feed and the other ones an earth, although the Autometer instructions stipulate to use an engine earth....duno if it makes a different but...
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