Codes after rebuild

ZELLDOG93

MEMBER
2004 FORD MUSTANG
3.9L
6 CYL
RWD
AUTOMATIC
208,000 MILES

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.

6 Replies

ZELLDOG93

MEMBER
111 POSTS

Sorry correct codes are as follows p1289 u1073 and p1284.

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Monday, September 11th, 2017 AT 11:23 PM

STEVE W.

MECHANIC
12,961 POSTS

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.