nsxe11026a.pdf

PGM-FI Control System
Troubleshooting Flowchart ECU
Check Engine light never comes
on (even for two seconds) after
ignition is turned on.
Is the oil pressure light on?
Turn the ignition switch OFF.
Inspect No. 5 fuse.
Is No. 5 fuse OK? Replace fuse.
Connect the ECU test harness
between the ECU and connector
(page 11-21).
Connect A13 terminal to body
ground.
Repair open in YEL between
No. 5 fuse and gauge assembly.
A13
Turn the ignition switch ON.
Replace the light
bulb.
Repair open in BLU
wire between ECU
(A13) and gauge
assembly.
A23
A24 A26 B2
G101
Less than 1 V
Is Check Engine light on?
Measure voltage between body
ground and the following ter-
minals individually: A23, A24,
A26, B2.
Is there less than 1V?
Repair open in wire
between ECU and in-
take manifold (G101)
that had more than 1V.
Substitute a known-good
ECU and recheck. If symp-
tom/ indication goes away,
replace the original ECU.