Originally Posted by Scott526
Update - The manual showed me how to get into the diagnostics on the shift panel. It reported a 21 12 code and no other codes. This is "Throttle position sensor failed low and ECU signals 100 percent throttle". So, I called NAPA and they have a TPS for about $450. I locate the TPS in the coach and it looks nothing like the new one from NAPA. I found a youtube video that says new technology has replaced the old sliding contactor/resistor type TPS. Has anyone installed this new tech? I am concerned about taking the old TPS off before having the right part.
Your existing TPS is reporting continuous operation at full throttle , so the trans doesn't shift till the engine revs to the governed limit .
Removing the TPS will not change that ; it actually may make for short shifting .
Have you examined the TPS control cable to the engine throttle linkage , to ensure the cable isn't bound up on something ?
Do you have a NAPA part number or photo of the replacement ?
Is there any indication that wiring and installation instructions are included , with the up-dated part ?