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Old 12-10-2012, 06:27 PM
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EBP scanner reading

Just a simple question about the EBP reading on my scanner - I'm getting a reading of 13 psi, KOEO. Should it not be 0 ? KOER at idle the reading is 14 psi. KOEO with the sensor unplugged I get 43 psi. My truck is a stock, early 99 F250, calif., auto, 4x4. There are no codes or symptoms, just happened to see the reading while familiarizing myself with the truck with the scanner - I'm a gas mechanic(40 years), not familiar with diesel diagnostics/parameters yet. Should I assume the sensor is out of range/bad ? I removed the steel tube and checked/cleaned it, was not totally clogged and the opening in the sensor wasn't clogged either but I would assume these sensors have a fairly good failure rate with age like the DPFE sensors on the gas engines. This truck has 186k on it and the sensor could very well be the original for all I know. Thanks for any advice on this.
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Old 12-10-2012, 06:40 PM
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Koeo it is reading barometric pressure just like the map sensor. Normal pressure is right around what you read. With koer the engine might be just that little bit to flop over to that 14. With it unplugged, it might be thinking it is a open cicuit when sensor is fully pressurized... That's all I can think of without tinkering with it myself
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Old 12-11-2012, 08:14 PM
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I wouldn't think it would be reading in psi if it were reading baro pressure, it would be in in/Hg. If it's reading baro KOEO, it is actually a MAP sensor in use. I'm thinking it reads true pressure in psi and maybe the sensor is corroded/stuck at this 13 psi range and since the truck still has the factory cat & muffler & all it really does generate about 1 psi more pressure at idle. I just thought maybe someone knew what a new sensor reads KOEO and/or with the sensor unplugged, like if you unplugged the old GM CTS on a gas engine it would read -40 F when reading it on a scanner. Mine is a Snap-On MT2500 that I've been using since 1988.
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