To test the PCM disconnect the batteries for 30 minutes to clear all codes then reconnect.Well, still stuck after a new optical sensor change. NO CHANGE AT ALL. Starts ok after 5-10 sec of cranking and instantly get check engine light with codes 17,18, 35,36... Any new suggestions? I have a OBD1 cable and working on getting a laptop to put the software on. Are there other grounds that I'm not aware of? 3 on the back of the passenger side head, 2 battery grounds and one under the exhaust manifold on the passenger side? Could the PCM be bad? Any help is greatly appreciated...
Insert IGN key and turn the key to the ON position but do not start the vehicle.
Now check for any codes.
If any codes appear and the vehicle is not started, the PCM is bad.