ChaserDream Posted March 17, 2018 Report Share Posted March 17, 2018 We switched a running driving car from a toyota st185 Map sensor to a GM 3bar sensor. Checked the wiring a dozen times. When we try to calibrate it using the Map sensor calibration, we get this error "Calibration failed, sensor is <5hg or >5hg" Run time values look normal and sensor does show proper change in voltage when running vs off vs sensor disconnected. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 18, 2018 Report Share Posted March 18, 2018 For a MAP sensor to successfully calibrate, it must read within 5KPa of the factory calibrated BAP sensor. You can go to the "General" tab of the runtimes screen to see both those parameters. I assume you have changed the calibration on the analog input settings? Where did the sensor come from? does it have a part number on it? There are a lot of very poor quality "fakes" of these sensors around so you possibly found one. Can you tell me what the BAP and MAP read with ignition on, engine off. Quote Link to comment Share on other sites More sharing options...
ChaserDream Posted March 18, 2018 Author Report Share Posted March 18, 2018 Thank you Adam for the explanation. I suspected this "new never used" sensor from Rock auto might be too good for the price I paid. I did change the input settings to reflect the Gm3bar. This sensor does NOT have a part number on it. Here is the BAP and Map IG on Eng Off Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 19, 2018 Report Share Posted March 19, 2018 The GM 3bar sensor should output around 1.58V at atmosphere, yours is only showing 0.68V. Either your sensor is bung, or you have the wiring wrong. Can you confirm you have it wired like below: Quote Link to comment Share on other sites More sharing options...
ChaserDream Posted March 19, 2018 Author Report Share Posted March 19, 2018 Mine is wired that same way. Ordered a new sensor. We will see it Tuesday Thanks Adam. Quote Link to comment Share on other sites More sharing options...
Grant Baker Posted March 30, 2018 Report Share Posted March 30, 2018 There are some 3 and 4 bar GM sensors around that are not "GM"... The 4 bar non genuine one works well and I do have the calibration information for that one at work. The 3 bar non genuine one also works well but I don't recall if I have the calibration details for it. Will look. Quote Link to comment Share on other sites More sharing options...
ChaserDream Posted March 31, 2018 Author Report Share Posted March 31, 2018 Up and running I ended up ordering a genuine a.c. Delco map sensor. Calibrated just fine. Quote Link to comment Share on other sites More sharing options...
Grant Baker Posted March 31, 2018 Report Share Posted March 31, 2018 Probably the best option! Quote Link to comment Share on other sites More sharing options...
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