Honda Acura NSX 1991 Service Manual page 256

Idle Control System
Troubleshooting Flowchart - Clutch Switch Signal
This signals the PGM-Fi ECU when the clutch is engaged.
Inspection of clutch
signal.
1
Measure voltage between C7 (-I-)
terminal and A26 (-1 terminal.
is voltage less than 1 V?
Y E S
Depress the clutch pedal.
Measure voltage between C7 (+)
terminal and A26 H terminal.
1 I-80
switch
I
I
I
N O
Turn the ignition switch OFF.
the A terminal and B terminal on
the clutch switch.
Measure voltage between PNK
Is there approx. 10 V?
Repair open in BLK wire be-
tween the clutch switch and
0 4 0 1 .
I
Replace
switch.
Y E S
Repair open in PNK
w i r e b e t w e e n E C U
switch.
Y E S
BLK (-)
the clutch