Cadillac Repair: codes 4 91 caddy, switch problem, absolute pressure
Questioni have 3 codes e-31,e-91, e-98 what do thay mean
AnswerE31 = shorted MAP (Manifold Absolute Pressure) sensor fault.
E91 = PRNDL switch problem.
E98 = Park/Neutral to Drive/Reverse Idle Speed Control motor problem.
You will need simple electrical schematics, Test procedures and picture locations of the components within the system that is causing you problems of which can't be done on this website which only allows one picture. I do not have a website so you will have to e-mail: onlineautohelp@msn.com in order to obtain the information.
