Origin of MAP sensor voltage
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Junior User
Joined: Aug 2001
Posts: 99
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From: Clearwater, FL
Origin of MAP sensor voltage
I ran the codes on my Dad's '85 E150, 302, carb van and it came back with a bad MAP code along with others but that is the first code generated and that's where I am starting. Checked the supply voltage first and no 5V. I suspect that there is no supply voltage to the other sensors that have generated a code also (TPS, EGR). Can anyone tell me where the 5V power to these sensors originate? I checked for ground continuity and that's OK.
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Origin of MAP sensor voltage
[updated:LAST EDITED ON 07-Dec-02 AT 02:44 PM (EST)]The SIGNAL RETURN wire comes from the computer, which generates the supply voltage to all the sensors. Trace that wire & make sure it's continuous, including across the big connector at the computer. If it's dead, your computer is probably shot, but they're only about $160 reman at any parts store (except THE ZONE... 
). $250 straight from Ford.
). $250 straight from Ford.
Thread Starter
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Junior User
Joined: Aug 2001
Posts: 99
Likes: 0
From: Clearwater, FL
Origin of MAP sensor voltage
Thanks, Steve83. I was afraid of that. I just called locally and they are $103 and have to order it. I chased the wires and there is no 5V supply to anything. Thanks for the quick response.
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Origin of MAP sensor voltage
It's the Bk/Wh wire from pin #46 off the EEC, so start there.
BTW Where is your EEC? Under the driver's seat, in the dash behind the radio, or somewhere else? Just curious...
BTW Where is your EEC? Under the driver's seat, in the dash behind the radio, or somewhere else? Just curious...
