question on air/fuel gauge

**808celicagt** · 09-20-2004, 03:22 PM

someone please help. which o2 sensor do i connect the wire from the gauge to? primary or secondary? or is there a way to splice it in the ecu. thanks

**MartinGouda** · 09-20-2004, 03:24 PM

good question.. ithough it was the primary... but what about if you have a 3-4-5 wire O2

and does it's load effect your ecu reading?

**Pineapple** · 09-20-2004, 04:43 PM

1 Wire O2 - easy, don't even ask :P
2 Wire O2 - One is signal, one is ground. Use a ohm meter to find the ground.
3,4 Wire - 1 signal, 1 heater power, 1/2 ground. Ohm meter to find ground, volt meter to find +12V heater with ignition on. Don't knoe if you need to start the engine.
A good gauge should be high resistanct which means it won't affect the signal. It doesn't matter where you tap the wire. Easier to find wire on the sensor, no need to drill hole on ECU. You'll need wiring diagram to tap on ECU.

**808celicagt** · 09-21-2004, 03:13 PM

Quote:

Originally Posted by Pineapple

1 Wire O2 - easy, don't even ask :P
2 Wire O2 - One is signal, one is ground. Use a ohm meter to find the ground.
3,4 Wire - 1 signal, 1 heater power, 1/2 ground. Ohm meter to find ground, volt meter to find +12V heater with ignition on. Don't knoe if you need to start the engine.
A good gauge should be high resistanct which means it won't affect the signal. It doesn't matter where you tap the wire. Easier to find wire on the sensor, no need to drill hole on ECU. You'll need wiring diagram to tap on ECU.

ok. thanks for the info

**MartinGouda** · 09-21-2004, 03:34 PM

1 heater power?

so what does that do?...keep the o2 sensor warm?

**Pineapple** · 09-21-2004, 04:02 PM

Yes. O2 doesn't work until it get warm. Old one will need longer to heat up also. Newer engine have heated O2 to help emission when engine is cold. It also help milage. ECU go close loop and run rich until O2 warm up.

**808celicagt** · 09-22-2004, 03:04 PM

Quote:

Originally Posted by Pineapple

Yes. O2 doesn't work until it get warm. Old one will need longer to heat up also. Newer engine have heated O2 to help emission when engine is cold. It also help milage. ECU go close loop and run rich until O2 warm up.

so which wire in the sensor do i exactly hook it up to. thanks

**Pineapple** · 09-22-2004, 03:29 PM

You gotta test it yourself or trial and error.

09-20-2004, 03:22 PM	#1 (permalink)
808celicagt Location: HAWAII Posts: 7 Join Date: Sep 2004 Last On: 04-21-2005 03:42 AM	question on air/fuel gauge someone please help. which o2 sensor do i connect the wire from the gauge to? primary or secondary? or is there a way to splice it in the ecu. thanks

09-20-2004, 03:24 PM	#2 (permalink)
MartinGouda USE THE SEARCH FEATURE!!! Location: Streetsville Posts: 12,023 Join Date: Oct 2003 Last On: 06-02-2008 01:41 PM Vehicle: DelsolTurboN2O 2nd Vehicle: Talon TSI AWD	good question.. ithough it was the primary... but what about if you have a 3-4-5 wire O2 and does it's load effect your ecu reading? __________________ www.martingouda.com.... the rumors are all true...

09-20-2004, 04:43 PM	#3 (permalink)
Pineapple Location: Toronto Posts: 4,250 Join Date: Jan 2004 Last On: Today 05:01 AM	1 Wire O2 - easy, don't even ask :P 2 Wire O2 - One is signal, one is ground. Use a ohm meter to find the ground. 3,4 Wire - 1 signal, 1 heater power, 1/2 ground. Ohm meter to find ground, volt meter to find +12V heater with ignition on. Don't knoe if you need to start the engine. A good gauge should be high resistanct which means it won't affect the signal. It doesn't matter where you tap the wire. Easier to find wire on the sensor, no need to drill hole on ECU. You'll need wiring diagram to tap on ECU. __________________ http://photos.yahoo.com/fredericklaw http://members.rankmyride.com/pineapplelaw

09-21-2004, 03:34 PM	#5 (permalink)
MartinGouda USE THE SEARCH FEATURE!!! Location: Streetsville Posts: 12,023 Join Date: Oct 2003 Last On: 06-02-2008 01:41 PM Vehicle: DelsolTurboN2O 2nd Vehicle: Talon TSI AWD	1 heater power? so what does that do?...keep the o2 sensor warm? __________________ www.martingouda.com.... the rumors are all true...

09-21-2004, 04:02 PM	#6 (permalink)
Pineapple Location: Toronto Posts: 4,250 Join Date: Jan 2004 Last On: Today 05:01 AM	Yes. O2 doesn't work until it get warm. Old one will need longer to heat up also. Newer engine have heated O2 to help emission when engine is cold. It also help milage. ECU go close loop and run rich until O2 warm up. __________________ http://photos.yahoo.com/fredericklaw http://members.rankmyride.com/pineapplelaw

09-22-2004, 03:29 PM	#8 (permalink)
Pineapple Location: Toronto Posts: 4,250 Join Date: Jan 2004 Last On: Today 05:01 AM	You gotta test it yourself or trial and error. __________________ http://photos.yahoo.com/fredericklaw http://members.rankmyride.com/pineapplelaw

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