I was looking thru teggar's igniter (ignition module) test and noticed
a contradiction in reference on this line, "The igniter... will only switch
off when grounded, but not when Terminal 4 is floating." is
contradicting with the service manual.
The 90 Prelude service manual (link below) says, "If the WHT wire
[comparable to Terminal 4] is shorted the igniter may be damaged"
needs some explanations why a short will damage the igniter.
Note that a 90 prelude igniter has three terminals and a ground.
Coil/Battery/ECU and ground.
The service manual seems to imply that a ground short may
damage the igniter, although Hondas are known as electronic
ground safe vehicles, such that accidental grounding of circuits
isn't likely to be harmful. Already, the ECU grounds terminal 4
to produce a spark so why bother. Ground or not, the question
still stands. Should grounding terminal 4 on a standard 4
terminal igniter (ignition module) cause damage?