All Information in this section is courtesy of Auto Meter Products, Inc., and has been copied from the Auto Meter Website (clicking will open a new window).
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Hooking Up the A/F Ratio Gauge
Can you give me any tips for hooking up my A/F meter?
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This listing has been updated with more specific guideline information. It is not the whole answer; if you do not see your specific application listed, or have any doubt as to the termination of the wiring in your own vehicle, please contact us directly first. We recommend you email us at: service@autometer.com for the fastest response.
This information only pertains to the upstream catalytic converter, which means you are looking for the O2 sensor somewhere between the catalytic converter and the exhaust manifold. Also, the newest additions to this list, denoted by *** are referring the termination point to the PCM side of the O2 sensor connector (fig.1) not at the O2 sensor direct (fig.2). Please refer to the picture(s) for reference and more info.
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This is normal operation for most computer controlled vehicles.
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***87-90 Mustangs
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The signal wire off the O2 sensor harness will go to either the dark blue wire w/ light green stripe for the left side and for the right side it will be a dark green wire with a purple stripe.
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***90 and up Mustangs
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The signal wire off the O2 sensor harness will go to either the red wire w/ a black stripe for the left side and the right side uses a gray wire w/ light blue stripe. This information actually holds true for the next 6 years, up through the '99 MY.
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87-93 Mustangs
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There are three wires off of the oxygen sensor itself. There are two white wires and one black wire. The black wire will be the signal wire.
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94-96 Mustangs
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There are two options for this particular hookup, being the left or right oxygen sensors. The best spot to make this hookup is right sensor at the PCM. This is located above or behind the passenger side kick panel. There will be a 104-pin connector in that location. To hook up to the left sensor, go to pin 43 which is a red wire with a black stripe. In order to hook up to the right sensor, go to pin 44 which is a gray wire with a light blue stripe.
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97-99 Mustangs (2000?)
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There are two options for this hookup as well, again it's the left or right sensors. Locate the PCM, which is above or behind the passenger side kick panel. Look for the 104-pin connector. For the left sensor you will go to pin 87 which is a red wire with a black stripe. For the right sensor you will go to pin 60 which is a gray wire with a light blue stripe.
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***93-95 F-Series Trucks
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There is a single O2 sensor connection; it is the gray wire with a light blue stripe.
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***96 and up F-Series Trucks
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The signal wire off the O2 sensor harness will go to either the red wire w/ a black stripe and the right side has a gray wire w/ a light blue stripe.
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***95-99 Neon
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The signal wire off the O2 sensor harness will be the black wire with a dark green stripe.
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***94 and up Camaros and Firebirds, V-8 only
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The signal wire for the O2 sensor remains the same for both vehicles, and is good up through the 99 MY. The connection for the left side is a purple wire w/ a white stripe, and for the right side it is a solid purple wire.
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***92 and up Civics, almost all body styles
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The signal wire off the O2 sensor harness will almost always be a solid white wire; however, in some instances, especially on 98's and newer, this wire may have a black stripe on it. The only variation would be the VX models - either email or call for details.
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92-95 Civics
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Look for the computer which is located above or behind the passenger side kick panel. Go to pin C18 on the connector. The other way is to go directly to the sensor, there will be four wires off of the sensor. Those wires are green, white, and two that are black. The white wire is the correct signal.
***94 and 95 Integras, including the following body styles: GS, GS-R, LS, and RS
The signal wire off the O2 sensor harness will be a white wire w/ a red stripe on it.
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***96 and up Integras, including the following body styles: GS, GS-R, LS, and RS
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For the most part, as with the Honda's, the O2 sensor signal wire will be a white wire, possibly w/ black stripe on it.
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94-98 Integra 1.8L
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Look for the computer of the vehicle or PCM. Go to pin D14 which is a solid white wire, or go directly to the sensor and tap into the white wire there.
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***90 - 94/95 Eclipse - including the following: 1.8L, 2.0L, or 2.0Lw/ Turbo
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The signal wire off the O2 sensor harness will be a white wire.
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***95 and up Eclipse - including the following: 1.8L, 2.0L, or 2.0L w/ Turbo
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The signal wire will be either a solid white wire or a white with a black stripe. However, it appears that some certain 97 models may have a white wire w/ a green stripe on it, instead of the black stripe.
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90-94 Eclipse 1.8L
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Go to the computer, which is located in the center console. Using the passenger side for access, locate the largest connector and go to pin 4 which is a white wire.
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91-94 Eclipse 2.0L/Turbo
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Same as the 90-94 Eclipse 1.8L.
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96-98 Eclipse 2.0L
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There are two sensors on this vehicle which are noted as either the front or rear. You will need to locate the computer of the vehicle which is located on the driver's side fender well between the shock tower and the front grill. Go to pin A30, which is for the front sensor. This will be your best reading. The color of the wire is white with a black stripe.
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Again, as previously stated, this is not a complete list for every car out there, but it will help in many cases. If you have any reservation as to the install of the A/F ratio gauge, please do not hesitate to contact us, as the O2 sensors themselves are not cheap to replace if the gauge is incorrectly installed. So, if you want to double check, or have an application not listed here, please either email us at: service@autometer.com, or call us directly at the following phone number: (815) 895-8141.
A couple of things to look for when connecting your A/F ratio gauge to your vehicle are the O2 sensor itself, and it's current condition. Normally, an oxygen sensor is designed to last about 50,000 miles. However, its life can be shortened by contamination, blocked outside air, short circuits, and/or poor electrical connections.
The oxygen sensor can become contaminated by, but not limited to the following:
- Leaded fuel - leaded fuel is the most common cause of O2 sensor contamination. Lead particles can coat the ceramic element and the sensor cannot produce enough voltage output for either the computer or the gauge.
- Silicone - Sources are antifreeze, RTV silicone sealers, waterproofing sprays, and gasoline additives. Silicone tends to form a glassy coating.
- Carbon - Carbon contamination results from an excessively rich fuel mixture. Carbon in the fuel can coat the sensor, too.
With this in mind, you may want to visually inspect the O2 sensor itself. When doing so, check to make sure that the outside of the sensor and its electrical connection(s) are free of oil, dirt, undercoating, and other deposits. If outside air cannot circulate through the O2 sensor, it simply will not be able to function.
Also keep in mind that the O2 sensor only generates anywhere from 0-1 volt, and averages around .5 volts. A poor or deteriorating electrical connection is not only frustrating but could also prevent this small voltage from reaching the computer and the gauge, too. Always be sure to check the electrical connections as well.
Testing the O2 sensor output is another way to ensure proper operation. A digital voltmeter can be used to test the output of an O2 sensor. WARNING! Be sure to only use a high impedance digital multimeter to measure the O2 sensor voltages. A conventional analog or low resistance meter can draw too much current and potentially damage the sensor itself. So, for testing, be sure to warm the engine to full operating temperature to shift the computer into closed loop. The sensor must be hot(at least 600 degrees or hotter) to operate properly. You may have to warm the engine at fast idle for 5-10 minutes with some cars to reach the target temp. Note that a few systems can drop out of closed loop at idle, so you may have trouble keeping the engine at a hot enough temp to see the readings you are looking for.
Just to reiterate, we STRONGLY recommend that when you make termination to the A/F ratio input wire on your vehicle that you solder the wires together, so that the connection is permanent, and also there is no potential for wire breakage or contamination of the signal transfer. PLEASE also be sure to test the signal wire BEFORE you solder the wires together, by twisting the wiring together; this will work for testing to ensure proper connection prior to the final termination.
See our Narrow Band and Wide Band A/F Gauges.
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