Recently, my grey Smart car (I presently own four Smarts - long story) threw me a hard curve ball: it drove to work just fine but would not go into gear 8 hours later. I had it towed home and have so far done the following, to no avail:
- removed and lubricated the clutch actuator
- (as per Tolsen's online advise to others) removed the wiring harness and did both a continuity test and a load test on each of the 17 wires
- bought Electrical Connection cleaner (Canadian Tire) and exhaustively cleaned every connection, including the harness/ECU interface
- removed and checked the Gear Position Module (it was truly spotless inside, but thoroughly cleaned the engine block region before re-assembly anyways
- reset the P0702 error code (no other codes thrown)
Of importance, when I removed the clutch actuator, I put a thin screwdriver into the fork cup, inside the clutch housing, and noticed it was able to pass through (suggesting the dreaded actuator-rod-wear-through-fork issue). Unwilling to drop the transmission (to change the fork), I firstly rammed and twisted a large crayon in the fork cup to get a good idea of the full fork cup dimensions. I then "simply" tapped the end of the actuator rod with a 7/16" NC die and threaded on a stainless steel acorn nut (from Fastenal), which was just a bit narrower than my crayon mold. After re-installing the clutch actuator, with its new acorn nut extension, I watched from underneath as my wife (carefully with foot on brake) shifted through some gears. The actuator rod modification seems to work very well.
But, alas, I've made no real progress. When I start the car and then select first gear, the car makes the same rhythmic clicking sound (and I think I sense a a very very slight forward rocking) that it did that fateful first day at work. When I select reverse, the clicking is louder and about twice as quick.
I would be humbly grateful for any suggestions.