How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask EricFromCT Your Own Question
EricFromCT, Ford Technician
Category: Ford
Satisfied Customers: 3957
Experience:  20 years dealership exp., ASE A1-A9 L1 L2, Ford Lincoln Mercury Senior Master, Diesel Certified
Type Your Ford Question Here...
EricFromCT is online now
A new question is answered every 9 seconds

Mercury grand marquis: What needs to be replaced

Customer Question

What needs to be replaced
Submitted: 2 years ago.
Category: Ford
Expert:  EricFromCT replied 2 years ago.
Hi. What is the problem you are having with your Grand Marquis?
Customer: replied 2 years ago.
Run good. The engine light come on. My code is p1633 l replaced battery cable
Customer: replied 2 years ago.
(Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  EricFromCT replied 2 years ago.
There is a circuit called keep alive power to the pcm. It is located on pin 55 of your pcm (engines computer). P1633 indicates that power on that circuit has been lost to the pcm. Generally it is from a broken wire. It can also be caused by a faulty pcm. What you should do first is access this pin on the pcm and check it for power.
Expert:  EricFromCT replied 2 years ago.
Have you checked this circuit for power yet? Do you have any more questions?