Codes after rebuild

2004 FORD MUSTANG
208,000 MILES • 3.9L • 6 CYL • RWD • AUTOMATIC
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ZELLDOG93
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Purchased vehicle with know blown heads, did all work properly and started fine. With the first start since purchase i have noticed coolant temperature gauge unresponsive to engine temperature oil pressure gauge reading normal then dropping to 0, tachometer and speedometer swept the planes one time that i saw and i and getting returning codes p0128, u1073 and one other which maybe a fluke or not i will post in a response. just to add when i drained engine i ran approximately two quarts of clean oil and let slowly drain for forty five minutes. I am curious to see the oil tomorrow.
Sep 11, 2017 at 11:21 PM
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ZELLDOG93
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Sorry correct codes are as follows p1289 u1073 and p1284.
Sep 11, 2017 at 11:23 PM
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STEVE W.
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P1289 - Coolant temperature sensor reading out of self test range. :IE the sensor is either out from the original overheating that took out the engine or it is shorted or disconnected. That would cause the lack of temperature reading on the dash. Testing involves looking at the live data from the sensor on the scan tool and wiggling and tapping on the sensor to see if the voltage changes rapidly. Then proceeding up the wiring harness flexing and moving that as well.

U1073 and P1284 do not show up relative to the Mustang.


U1073 does show as a valid code on the V8 in the trucks. It reads that there is a failure in the coolant data system, which could mean the ECT is unplugged like the P1289 code indicates.

P1284 does show as injection control pressure failure on the power-stroke diesels though.
Sep 12, 2017 at 12:10 AM
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ZELLDOG93
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This is what i was able to pull.
Image (Click to enlarge)
Attached Media
Sep 12, 2017 at 10:55 AM
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STEVE W.
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Okay, did find the C1284 as a cluster code,(not a power-train code).
The test for it is simple, install a new oil pressure switch, and check the wiring.

U Codes are normally network failure codes, I would check that the current cluster matches the VIN.
Sep 12, 2017 at 1:06 PM
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ZELLDOG93
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That is what i figured when i first saw the codes then i started to over think it. i am going to try this and let you know what i come across.
Sep 12, 2017 at 2:35 PM
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STRAILER
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Please let us know :)

Cheers, Ken
Sep 13, 2017 at 11:14 AM