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Old 08-13-2001, 04:35 PM   #1
Jon [in CT]
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Join Date: Nov 2000
Chapter/Region: NESIC
Location: Connecticut, USA
02 WRX Sedan

Default WRX Front Air/Fuel Sensor Info

I've concluded that the WRX's front A/F sensor is, in fact, a Denso 4-wire wideband A/F sensor. I've located a packaging and manufacturing process patent for a Denso sensor (US5859361 / EP0823631) whose illustration is essentially identical to the one given in the WRX shop manual, Vol 8, page FU-17 (DOHC). I've included the one from the European patent at the end of this post and laid it on its side to make comparisons easier.

I know that Minnesotta WRX (Todd) is attempting to obtain data sheets for this A/F sensor from a contact within Subaru, but I suspect that either the data will not be forthcoming or will be found inadequate for the purpose of designing a circuit that can translate the ECU/sensor voltages and currents into a linear voltage signal that could drive a meter. It may be possible, however, for a bright electrical engineer (I am neither) to study the patents filed by Denso describing how to control a wideband sensor and then design a circuit that can drive an A/F meter.

US5993641A1 / EP0851108 Air-fuel detection system using a limit current sensor
EP0974835 Gas concentration measuring apparatus producing current signal as a function of gas concentration
EP0984275 Gas concentration sensing apparatus capable of suppressing sensor voltage oscillation
EP0995986 Gas concentration sensing apparatus
US5719778 / EP0695983 Heater control apparatus for oxygen sensor

The list above is hardly exhaustive. Anyone out there understand this stuff?
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Old 08-14-2001, 01:34 AM   #2
Minnesota WRX
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Join Date: Mar 2001
Location: Waconia, Mn, USA
2002 WRX Wagon


If you missed it in the 4 in 1 gauge thread....

My Subaru contact called FHI and they said they didn't receive the e-mail asking for the info. FHI said they would forward the info in about a week.

I'm going to personally talk to an engineer in charge of the USA Impreza's on Wednesday. He should be able to get us the info needed.

Don't give up hope. It looks like it will be a simple milliamp amperage gauge. Simple to build and use.

Got to run

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Old 08-14-2001, 02:25 PM   #3
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I wonder if it would stand to reason the rex Catalyst Temperature Sensor ( or what is being referred to as the EGT ) in the up pipe would be denso as well?
'DENSO's Catalyst Temperature Sensor has high accuracy ( 5 to 10C), a wide detection range (up to 1000C), and a quick response time (equivalent to 2.3 thermocouple) with high reliability.

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