I don't know for sure, but I'm wondering if you 'need' to engage the "Hill Descent" for low range engine braking to function like we all would expect?
I'll try mine next chance I get and report back.
Oh, Throttle Position Sensor...not likely I would think. If the TPS was faulty, your vehicle wouldn't drive right.
In fact I can't think of any individual sensor that would cause that. To my thinking, it's the software in the ECU that is not doing what it should based on the input it is receiving from the various sensors: Wheel speed via ABS rings, Engine RPM via Crank Angle Sensor, Throttle position from TPS, Gearbox Pressure sensors from Valve Body & Gear / 4WD selection switches.
If ABS or RPM were faulty your Dash Tacho and Speedo would be jumping around all over the place, which I HAVE seen.
Anything else should throw a fault code. Actually, that would be the best place to start if you haven't checked already. See what OBDII codes are logged, if any?
|