Honda Acura NSX 1991 Service Manual page 202

PGM-FI Control System
-Troubleshooting Flowchart
Check Engine light never comes
Is the oil pressure light on?
YES
Turn the ignition switch OFF.
Connect the ECU test harness
between the ECU and connector
(page 11-21).
Connect Al3 terminal to body
g r o u n d .
Turn the ignition switch ON.
I s Check Engine light on?
YES
ground and the following ter-
l
minals individually:
l
A2B, 082.
Is there less than 1 V?
YES
S u b s t i t u t e a k n o w n - g o o d
ECU and recheck. If symp-
tom/ indication goes
replace the original ECU.
N O
bulb.
wire between ECU
assembly.
A23, ,A24
o p e n i n w i r e
between ECU and in-
take manlfold (0101)
that had more than IV.
away,
E C U
Inspect No. 5 fuse.
Repair open in YEL between
No. 5 fuse and gauge assembly.
I
A l 3
and gauge