Ford Repair: electrical ground problem, crown vic, ground positions

Question
Hello Eric,
I have a 1990 Crown Vic with a 5.0L engine and automatic trans that has been giving me some electrical problems.  The check engine light comes on when I apply the brakes rapidly and/or turn left.  The 4 hand held trouble codes are 22-MAP sensor out of range, 51-ECT sensor circuit open, 53-TP sensor open or above max, and 54- circuit open. The check engine light is only on when, as mentioned befor, the brakes are applied and the left turn.  When the steering wheel is staitened out and the gas is applied the light goes off. I have replaced all of the sensors and still have the same problem.  I called a shop and found out that all of these sensors should have a common ground. So my question is given the information above is there anything else that you can think of that could cause this unusual situation? Also where would these sensors be grounded together? I need to know where they are grounded in both the steering column and the engine compartment. Any help you can offer would be greatly appreciated.


Answer
Hello and thanks for the question...I'll try to help.
I'm sorry but I'm not going to look through several wiring diagrams to locate ground positions. What you can do is go to www.alldata.com and get a subscription for your vehicle. They will have ALL the information that you need to remedy this problem.
Erik