Evening all

I have a year 2000 Ford KA that came to me with a bad hesitation. This motor employs a TMAP set-up, as opposed to the MAF type as seen on the earlier ones.

No fault codes were present, but live data showed an issue with the intake air temperature. At 123 degrees C, it was clear that something was a miss. After supplying a substitute voltage of approx 3.0v (from memory) the scan tool showed a more plausible, 20 degrees & the engine revs sweet.

We were lucky enough to have a donor car available & a swap of the TMAP was made. The readings were just the same, so I checked the data on the donor car & it was a plausible 18 degrees.

I have a good ground & a 5 volt feed & two output signals (MAP & IAT). Continuity & short tests checked out ok. I have even re wired from the TMAP to the PCM using new terminals (to eliminate the TMAP connector) & the readings are just the same.

It seemed fair to blame the ECU at this point, so I obtained a second hand unit (with key & antenna). Guess what! Its still got the same high IAT (Intake Air Temp) readings

I am starting to clutch at straws now & I am wondering if this has had an ECU swap previously. I sourced my replacement, based on the part number on the unit in the car. What if someone had previously "chucked" any old ECU on it, that was at hand? Would that even work?

The engine looks like the original & the wiring harness doesn't look like its been messed with.

Anyone else ever seen this?

Cheers

Dave

PS. As an interesting side note. Non of my scan tools have a PID (Parameter Identification) for the MAP value on this (Not even IDS). It could be the case that the MAP readings are screwy also, but with no way to view them ARRRRRGGG!