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P1502 Throttle Jacking Unit, Spring Test – Above Limit Clean the connectors, check the wiring for damage - clear the code and see if it comes back. If it does, you will likely need a new throttle jacking unit. Thanks for the quick reply, I have seen other posts where this problem manifested itself solely due to disconnecting the battery or by having the battery become low. I have also read of several other's replacing the e-throttle assembly itself without success. Hopefully someone can chime in with an actual successful repair.
I've searched and seen several older posts on this topic but no solution. I have a 2000 Boxster S. Replaced bad fuel pump, had to remove battery of course to do it. Hooked everything back up and I have a P1502 stored as a pending error code and car won't rev past 1200 rpm, scan indicates that elec throttle is not opening past 5.8% in fact it is not moving at all, just stuck at 5.8%. I can go through the throttle adaption procedure with no change whatsoever. If I clear the code I can hear the elec throttle begin to buzz immediately and car runs fine until it is shut down. Upon restart code is set again. Anyone ever come with a solution for this??