Honda Acura NSX 1991 Service Manual page 444

Electrical Troubleshooting
Troubleshooting Flowchart (cont'd)
Self-diagnosis D indicator light
blinks three times.
Turn the ignition switch ON.
Check whether the PGM-FI self-
indicator blinks (Section
Does the Self-diagnosis indicator
blink?
N O
Turn the ignition switch OFF.
Disconnect the 26P and 22P con-
nectors from the control unit.
Turn the ignition switch ON.
Measure the voltage between the
D18 (BLU) and A25 (BRN/WHT)
terminals.
Is the voltage 4.75-5.25 V?
Y E S
Turn the ignition switch OFF.
Connect the ECU test harness be-
tween the connectors and the
'control unit.
Turn the ignition switch ON.
Measure the voltage between the
D7 and A25 terminals.
Is the voltage 0.44-0.56 V?'
Check for loose control unit con-
14-56
Y E S
Repair the PGM-FI Sys-
tern. See Section 11.
4.76-5.25
Repair open short in
NO
D18 terminal of the
PGM-FI ECU.
Repair open or short In
between
the D7 terminal and the
throttle angle sensor.
NOTE: View from terminal side.
A26
ECU TEST HARNESS TERMINAL
D7