Re: NF Fairlane V8 Automatic Transmission Problems
I had a problem with the transmission that didn't generate any fault codes (same as you said you had none), which appeared to be a loss of throttle position. This occurred after an extended period of driving, at a constant speed (across the nullabor actually). The symptoms were: Transmission reluctant to shift to a higher gear (especially at very light throttle), and delaying or doesn’t lock-up the converter. It was possible to manually select any gears, and the ‘fault’ occurred in either power or economy modes. I reset the throttle position, using the following procedure, and the "fault" was cleared. I think this is only valid for V8's.
With the engine at correct operating temperature, carry out the following:
(a) Allow engine to idle in ‘D’, with A/C off, for 60 seconds. This sets the closed throttle reference point for the ECU.
(b) Switch the engine off, but leave the ignition on. Hold the accelerator pedal to the floor for 60 seconds. This sets the wide open throttle position reference point for the ECU.
These are sort of similar to your symptoms, but either way, it only takes a couple of minutes to do, and costs nothing, so maybe try this, as it worked for me!