help on A/F gauge
03-29-2002, 04:14 PM
#1
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help on A/F gauge
Hi
I just hooked up my A/F meter to the ECU yesterday. It seems to behave very erratically and also my CEL light keeps coming on! I get 0303 as error code, which happens to be the O2 sensor I hooked up to. I have read of one other person having the same problem. how should I fix this? Try to hook it directly to O2? I am thinking of just disconnecting it altogether and selling the damn gauge! I was worried today cos my fuel pressure went up to over 100 psi. When I realized it was because of this, I felt a little better.
Nigel
I just hooked up my A/F meter to the ECU yesterday. It seems to behave very erratically and also my CEL light keeps coming on! I get 0303 as error code, which happens to be the O2 sensor I hooked up to. I have read of one other person having the same problem. how should I fix this? Try to hook it directly to O2? I am thinking of just disconnecting it altogether and selling the damn gauge! I was worried today cos my fuel pressure went up to over 100 psi. When I realized it was because of this, I felt a little better.
Nigel
03-29-2002, 04:35 PM
#2
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Join Date: Oct 2001
Posts: 162
i just hooked up an autometer a/f ratio gauge in my '95. it act's pretty funny too. i haven't had any sort of check engine codes bc of it, but it reads VERY lean most of the time. (like 1 bar red, 1 bar stoich.) and it pegs out rich when i get over 3800rpms. i tapped mine on both o2 sensors, and it reads the same. if i were you, i'd try running it under the hood to the sensor itself. i don't know for sure, but i think the sensors go to something else before they reach the ecu...
i'd try to hook it up under the hood if it were me. there should be 3 wires going to each o2 plug: a red, a white, and a blue. (the rear sensor wires have stripes on them, but still the same scheme.) tap into the blue wire on which ever one you decide to use. the red is a hot wire that goes to the heater for the sensor. the white wire is a ground of some sort...maybe for the heater element. and the blue wire is the sender to the ecu.
try that and let me know what happens.
-Jason
i'd try to hook it up under the hood if it were me. there should be 3 wires going to each o2 plug: a red, a white, and a blue. (the rear sensor wires have stripes on them, but still the same scheme.) tap into the blue wire on which ever one you decide to use. the red is a hot wire that goes to the heater for the sensor. the white wire is a ground of some sort...maybe for the heater element. and the blue wire is the sender to the ecu.
try that and let me know what happens.
-Jason
03-29-2002, 06:12 PM
#3
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Join Date: Mar 2002
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Originally posted by j-95G
i just hooked up an autometer a/f ratio gauge in my '95. it act's pretty funny too. i haven't had any sort of check engine codes bc of it, but it reads VERY lean most of the time. (like 1 bar red, 1 bar stoich.) and it pegs out rich when i get over 3800rpms. i tapped mine on both o2 sensors, and it reads the same. if i were you, i'd try running it under the hood to the sensor itself. i don't know for sure, but i think the sensors go to something else before they reach the ecu...
i'd try to hook it up under the hood if it were me. there should be 3 wires going to each o2 plug: a red, a white, and a blue. (the rear sensor wires have stripes on them, but still the same scheme.) tap into the blue wire on which ever one you decide to use. the red is a hot wire that goes to the heater for the sensor. the white wire is a ground of some sort...maybe for the heater element. and the blue wire is the sender to the ecu.
try that and let me know what happens.
-Jason
i just hooked up an autometer a/f ratio gauge in my '95. it act's pretty funny too. i haven't had any sort of check engine codes bc of it, but it reads VERY lean most of the time. (like 1 bar red, 1 bar stoich.) and it pegs out rich when i get over 3800rpms. i tapped mine on both o2 sensors, and it reads the same. if i were you, i'd try running it under the hood to the sensor itself. i don't know for sure, but i think the sensors go to something else before they reach the ecu...
i'd try to hook it up under the hood if it were me. there should be 3 wires going to each o2 plug: a red, a white, and a blue. (the rear sensor wires have stripes on them, but still the same scheme.) tap into the blue wire on which ever one you decide to use. the red is a hot wire that goes to the heater for the sensor. the white wire is a ground of some sort...maybe for the heater element. and the blue wire is the sender to the ecu.
try that and let me know what happens.
-Jason
Just curious though. I hooked up to pin 49 or 50 (can't remember which exactly), but it was white at the ECU. I will try to hook it into the sensor itself. Fortunately, I ran extra wires to the engine through the firewall so I can make use of one of those.
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