Sticky ECU Code 14
 

Hello, a friend's 1996 Honda City (with an engine almost identical to
the D16Y7, 4cyl SOHC manual) recently had an uncontrollable high idle.
The ECU said code 14 (IAC), so they replaced the IAC valve (3-pin,
rotary).

However it still keeps blinking the same code, and I tried resetting
the ECU (overnight!) and even pulling other sensors, but it keeps
blinking code 14, and won't blink any other error even when other
sensors are disconnected.

What could be the problem? Thanks so much.