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Old Jul 18, 2011 | 11:47 AM
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Originally Posted by CheapoSteveo
Sorry fellas, finally had a weekend off, spent with my wife and kids, instead of under the hood of this &%$#@ truck. F150,1991, 4.9L, FI,with an E4OD. tran..Changed out MLPS due to hard shifts and error codes. New part required removing pins from connector and re-inserting them in the new. Thought I had taken batt. off-line but the cable had fallen and was barely touching the post. Hence my surprise at the spark. Now truck will only start in neutral, still shifts hard and temp guage inop. Will no longer pull codes either. Wiring diagram shows everything on grey-red circuit inop. Any thoughts. ECM is F1TF-AMA. Very hard to find, can another ecm be used?


Is this your set up?

What were the exact codes originally?

No codes now during Key on/ Engine off?
No codes now during Key on/ Engine on?
No codes Both?

What is "everything" on Grey/Red circuit?
Last edited by ymeski56; Jul 18, 2011 at 04:11 PM.
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Old Jul 18, 2011 | 03:45 PM
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Not the same. Mine has hash mark to line up for neutral, no holes for bit, wires extend from top of sensor. Grey / red=temp sensor, Map, E4OD, it shows to be #46 (signal return)on harness.
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Old Jul 18, 2011 | 04:14 PM
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Originally Posted by CheapoSteveo
Not the same. Mine has hash mark to line up for neutral, no holes for bit, wires extend from top of sensor. Grey / red=temp sensor, Map, E4OD, it shows to be #46 (signal return)on harness.
What were the exact codes originally?

No codes now during Key on/ Engine off test?

OR

No codes now during Key on/ Engine on test?

OR

No codes during either test?
Last edited by ymeski56; Jul 18, 2011 at 04:17 PM.
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Old Jul 19, 2011 | 07:24 PM
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Original codes 624-625. Code reader will not show any codes KOEO,KOER.All circuits affected- MAP, TPS, EGR Position, Air Charge Temp, Self test output, Knock sensor Eng. Coolant, MLPS.
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Old Jul 19, 2011 | 08:00 PM
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Originally Posted by CheapoSteveo
Original codes 624-625. Code reader will not show any codes KOEO,KOER.All circuits affected- MAP, TPS, EGR Position, Air Charge Temp, Self test output, Knock sensor Eng. Coolant, MLPS.
Electronic pressure control solenoid circuit fault code(s) is a shift solenoid. Not the MLPS.

Those affected circuits mentioned aren't on the same power feed. Or are they? Remove some of the connectors & w/ key on, check for voltage going to ground from their harnesses. Looking for 5v.
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Old Jul 19, 2011 | 09:01 PM
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Unsure about power feed, not the best at reading wiring diagrams. Was told by retired Ford trans. mech.,that the first thing to do is replace original MLPS, they are a source of multiple problems in early E4OD's.
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Old Jul 19, 2011 | 09:26 PM
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Originally Posted by CheapoSteveo
Unsure about power feed, not the best at reading wiring diagrams. Was told by retired Ford trans. mech.,that the first thing to do is replace original MLPS, they are a source of multiple problems in early E4OD's.
Not sure why unless no start in park/neutral or start's in gear. The shift solenoid however, is part of engine/ shift synchronicity.
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Old Jul 19, 2011 | 09:29 PM
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Starts in neutral, not in gear, not in park.
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Old Jul 19, 2011 | 09:32 PM
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Originally Posted by CheapoSteveo
Starts in neutral, not in gear, not in park.
That was the symptom before, of after you worked on the MLPS?
Last edited by ymeski56; Jul 19, 2011 at 09:52 PM.
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Old Jul 19, 2011 | 11:22 PM
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After. Before was just hard shift.
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