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Car left me stranded. Towed it home and changed the ignition control module. starts right up but now has an SES light. I took a data log to try and get an idea (attached) I'm scratching my head. my O2 sensor starts going crazy at about 40 seconds in. I cant confirm it wasn't doing that before as its been a long time since I hooked up to the EBL and checked things out but why the SES light all of the sudden? I changed a Map sensor a couple weeks ago and the car ran fine. then I changed the map sensor connector in the process of pulling the distributor to change the ignition control module.
IAT/MAT low, did you unplug the sensor and not plug it back in? A low error on IAT/MAT is basically an open circuit. Can see in the WUD Diagnostic display that it is an open circuit. Reporting -40°F/°C to the ECM.
I'm seeing something different than you are Rbob. Maybe i have an outdated version of the WUD? Im showing oil temp at -40 but CTS and IAT at 59/63 degrees.
To see the raw, real, actual sensor values use the WUD Diagnostic display. Otherwise you are looking at default values that the ECM creates and uses when there is a bad sensor.
