Honda Acura NSX 1991 Service Manual page 1065

If the starter still does not crank the engine, re-
move the starter and diagnose its internal
problems.
in the BLKIWHT wire circuit between the starter
and ignition switch, and connectors. Check the
ignition switch.
On cars with automatic transmission, check the
shift position console switch (neutral safety
switch) and connector.
On cars with manual transmission, check the
starter relay, clutch interlock switch and con-
nectors.
NOTE: Check the No. 29 (50A) fuse and the start-
er cut relay, and investigate the security alarm
system.
3. Check for wear or damage:
The starter should crank the engine smoothly and
steadily.
If the starter engages, but cranks the engine errati-
cally, remove the starter motor. Inspect the starter,
drive gear and flywheel ring gear for damage.
Check the drive gear overrunning clutch for binding
or slipping when the armature is rotated with the
drive gear held. Replace the gears if damaged.
4. Check cranking voltage and current draw:
Voltage should be no less than 8.5 volts.
Current should be no more than 350 amperes.
If voltage is too low, or current dravy too high, check
for:
Open circuit in starter armature commutator
l
segments.
Starter armature dragging.
l
l Shorted armature winding.
5. Check cranking rpm:
Engine speed during cranking should be above 100
rpm.
Loose battery or starter terminals.
l
Excessively worn starter brushes.
l
l Open circuit in commutator segments.
Dirty or damaged helical spline or drive gear.
l
Defective drive gear overrunning clutch.
l
6. Check the starter disengagement:
Press the clutch pedal all the way (M/T only), turn
the ignition switch to "Start" and release to "Run."
The starter drive gear should disengage from the
flywheel ring gear.
If the drive gear hangs up on the flywheel ring gear,
check for:
l Solenoid plunger and switch for malfunction.
Drive gear assembly for dirt or damaged overun-
l
ing clutch.