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Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 8612
Experience:  Mitsubishi employed and Factory trained ASE certified technician
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Diamante: Doug. My 92 Diamante Suddenly won't change gears.

Customer Question

Hi Doug. My 92 Diamante Suddenly won't change gears. Its stuck in 3rd, I believe (3k rpm at 60mph).
Submitted: 2 years ago.
Category: Mitsubishi
Expert:  Doug replied 2 years ago.
If the vehicle is stuck in 3rd gear (fail safe) and there are NO error codes at all (steady flash from code check), check your park position switch is reading correctly, passing voltage only to one pin at a time etc (if you don't have an OBD1 scan tool to read it). Otherwise there is very little that can cause this apart from an internal transmission ecu malfunction. Your pulse generators etc should all indicate a fault if one was reading wrong and so forth.
If however you have either low or high output on the test wires (12V or 0V when checking codes), this is pretty much a guarantee of an internal problem in the ecu.