I am new to the forum and was reading some of the Allison transmission threads. I no longer have my RV, but I had a 1996 Allegro with Cummins and Allison combination. The transmission began to shift oddly or not at all. I was able to get it to shift by manually pressing the transmission controller pad. I was out of town on a trip and stopped in a diesel truck shop. They scanned it and told me something needed to be replaced (I don't remember what, this is 15 years ago) at a cost of nearly $2000. I asked questions and got the fault codes.
I went out to the RV and got on the internet and began searching. The code had something to do with the Throttle Position Sensor (TPS). I began to think about this. TPS fault code..., but I was having transmission problems. Thus, the throttle pedal and transmission MUST be linked somehow. I crawled underneath and found the throttle cable. I followed it to everything it physically connected to. I found and followed all the transmission linkage. The two did appear to intersect at one point. However, there was a small rod hanging loose at this apparent intersection. It turns out that a small C-Clip had broken and allowed this connection to fall apart.
I went to an auto parts store, bought an appropriate C-Clip, installed it and never had another problem.
I hope this helps someone.
I went out to the RV and got on the internet and began searching. The code had something to do with the Throttle Position Sensor (TPS). I began to think about this. TPS fault code..., but I was having transmission problems. Thus, the throttle pedal and transmission MUST be linked somehow. I crawled underneath and found the throttle cable. I followed it to everything it physically connected to. I found and followed all the transmission linkage. The two did appear to intersect at one point. However, there was a small rod hanging loose at this apparent intersection. It turns out that a small C-Clip had broken and allowed this connection to fall apart.
I went to an auto parts store, bought an appropriate C-Clip, installed it and never had another problem.
I hope this helps someone.
