Honda Acura NSX 1991 Service Manual page 456

Electrical
Troubleshooting Flowchart (cont'd)
Self-diagnosis D indicator light
to normal operating temperature.
Turn the ignition switch OFF.
Connect the ECU test harness be-
tween the control unit and con-
nectors.
Turn the ignition switch ON and
wait for at least two seconds.
Using an analog voltmeter, meas-
ure the voltage between the D 16
Is there approx. 5 V for over five
seconds?
Raise the car.
Start the engine.
Shift to
Raise the engine to over 2,000
rpm (over 40 mph in 4th gear) for
five seconds.
t
Release and depress the throttle
so that the transmission down-
shifts and upshifts.
Using an analog voltmeter, meas-
ure the voltage between D16 I+ 1
and A25 (- 1 terminals
To page 14-69
Troubleshooting
YES
q
position.
lifts are placed properly. (See page l-6.1
While testing, be careful of the rotating rear wheels.
A26
ECU TEST HARNESS TERMINAL
4 V approx. every four seconds?
NO
NO
Turn the ignition s&itch OFF.
Disconnect the A connector from
the PGM-FI ECU.
Check for continuity on the PNK
wire between the D 16 terminal on
To page 14-69
Y E S
Signal (Section 11).
Repair the PGM-FI Sys-
tem (Section 11).