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Hello! I have a 1990 Cadillac Deville, 4.5L V8 PFI, 75,068 Miles. Today I was driving and all of a sudden the SERVICE ENGINE SOON light came on and both the Fuel In Tank and Electronic Climate Control read outs started showing a “d”. (See pictures in links below). https://i.imgur.com/urkMrQF.jpg https://i.imgur.com/jnIw9xU.jpg https://i.imgur.com/VXwOqxk.jpg Gallery On top of this the Air conditioning fan started blowing air from the dash, not hot or cold, just ambient temperature air and I can’t change the Climate Control or see the fuel level anymore. When I got home I unhooked the battery to reset it then turned the ignition on without starting the car and pressed “Off” and “Warm” on the climate control so see if I could get a code it looked like a code flashed (to fast for me to read), then it read 000 and would blink over to .7.0 occasionally. I replaced some vacuum hoses that were kind of bridle as well as replaced the o-ring that goes between the air filter housing and the carburetor since it was cracked. I hooked the battery back up and the dash read-outs still showed “d”, SERVICE ENGINE SOON light, and the air was still blowing from the dash. I called around and neither Auto Zone or O’rilleys has the OBD 1 connector to scan the older (pre 1996) cars. The car runs great so it’s hard to trouble shoot whats going on, and I cant find anything at all online about this specific problem. Any ideas or suggestions?
I hope this problem could help somebody else who may have the same problem. So all these lights have come on and also it is limited to 90MPH. I have researched and have written down the error codes below. Please could someone indicate where the fault may be on the car, how to diagnose and possibly fix each code (clean sensor, maybe connector or check make sure good connection - maybe check crimping). Whether it be a sensor or connector. Hopefully the following codes will provide a check list of what to check and where it is on the car so me and anyone else with the same problem can just work through each stage and hopefully in the end come out with having fixed it anyway thanks for your help in advance here are the error codes in order: Displayed on dash: EXP ID 113 EXP ID 84 EXP ID 25 EXP ID 54 EXP ID 50 Service Stability SYS Restricted to 90 MPH ERROR CODES: ABS C1242 C - Pump Motor Circuit Open ABS C1252 C - Left Front Normal Force Malfunction PCM P1153 C - HO2S Insufficient Switching Bank 2 Sensor 1 PCM P1189 C - Pump Motor Circuit Open PCM P1350 C - Left Front Normal Force Malfunction RIM B1009 C - EEPROM Checksum Error RSS C1711 C - DAMPER ACTUATOR SHORT CKT GROUND RSS C1761 C - Right Front Position Sensor Input Fault RSS C1782 C - ICCS2 DL Left Output Short Circuit to Bat RSS C1783 C - Road Sensing Suspension - ICCS2 DL Left Output Short Circuit to GND