Honda Acura NSX 1991 Service Manual page 454

Troubleshooting Flowchart (cont'd)
Self-diagnosis D indicator light
blinks ten times.
Turn the Ignition switch ON.
Check whether the PGM-FI self-
diagnosis indicator blinks (Section
1 1 ) .
the self-diagnosis indicate
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 (BRNIWHT)
terminals.
Is the voltage 4.75-5.25
Connect the ECU test harness be-
Start the engine and warm it up
to normal operating temperature.
Measure the voltage between the
D5 and A25 terminals.
Is the voltage 0.50-
Y E S
Check for loose control unit con-
nectors. If necessary, substitute
a known-good control unit and
recheck.
14-66
Y E S
Repair the PGM-FI Sys-
tern. See Section 11.
Repair open or short in
BLU wire between the
NO
D18 terminal of the
PGM-FI ECU.
Repair open or short In
w i r e b e -
N O
tween the D5 terminal
and the coolant temper-
ature sensor.
NOTE: View from terminal side.
ECU TEST HARNESS TERMINAL