From the Ross Tech wiki
http://wiki.ross-tech.com/wiki/index...3/P1545/005445
17953/P1545/005445 - Throttle Valve Controller: Malfunction
Possible Symptoms
Increased Idle Speed
Bucking at Load Change
Possible Causes
Throttle Body dirty
Throttle Body Wiring faulty
Throttle Body faulty
Possible Solutions
Clean Throttle Body
Check Throttle Body Wiring
Check Throttle Body