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Old 06-09-2010, 02:08 PM   #1
1988 f150 xlt lariat 4x4
 
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Default relay and ecm wiring

i have an 1988 f150 with a 5.0 engine and someone who had the vehicle before me did his own wiring now i cant check the check engine light codes because the self input wire is missing i tried looking down the wire harness but cant find one cut there is a spliced wire going into one of my relays can anyone tell me what color wires are supposed to go into the two relays (brown and green) thank you

my truck will drive fine for 20 minutes and then will get a power surge and the check engine light comes on and goes off and then on again a few minutes later
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Old 06-09-2010, 07:52 PM   #2
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The STI is there somewhere. They couldn't have removed it completely. Find it at the main computer plug at the drivers side firewall and trace it down.

EEC- yellow, red ('88 also shows this as a fusible link), black, red/green
Fuel pump- yellow, red, brown, tan/green
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Old 06-11-2010, 01:46 PM   #3
1988 f150 xlt lariat 4x4
 
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relay and ecm wiring-update-eec-relay.jpg

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Old 06-11-2010, 08:04 PM   #4
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That is beautiful. lol

Either get a Haynes manual (it has decent wiring diagrams) or go to the junkyard and get a harness.
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Old 06-11-2010, 11:20 PM   #5
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thanks i am going to the junkyard tommorow
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Old 06-14-2010, 04:54 PM   #6
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Default i got codes

i got a 33 and a 24 as my codes koeo i dont know how to test koer i have a new tps but still got the 33 aND I DONT KNOW WHAT A 24 IS
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Old 06-14-2010, 08:59 PM   #7
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33= EGR valve opening not detected. It may be stuck or may not be getting vacuum through/from the control solenoid.
24= ACT sensor out of self test range.
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Old 06-14-2010, 09:25 PM   #8
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where is the location of the air charge temp sensor
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Old 06-14-2010, 09:27 PM   #9
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is it under the throttle body going into the block? if so i removed it and it looks fine is there another reason it would throw that code
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Old 06-14-2010, 09:31 PM   #10
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are the coolant temp sensor and the act sensor the same
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Old 06-14-2010, 09:31 PM
 
 
 
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