Honda Acura NSX 1991 Service Manual page 216

PG M- FI Control System
-Troubleshooting Flowchart
Self-diagnosis check Engine light indicates code 3: Most likely an elektrical
, Pressure (MAP) Sensor system.
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Self-diagnosis check Engine light indicates code 5: Most likely mechanical problem (broken hose) in the Manifold
Absolute Pressure (MAP) Sensor System.
,
The MAP sensor converts manifold absolute pressure into electrical
SILICON
reported on.
jumped (page II-18). CODE
3 is indicated.
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Do the ECU Reset Procedures
(page 1 l-19).
Start the engine and allow it to
idle.
does it indicate CODE 37
YES
Turn the ignition switch OFF.
Turn the igniti; switch ON.
MAP Sensor
VACUUM
OUTPUT
CAVITY
VOLTAGE
3 . 0
2 . 5
2 . 0
1 . 6
1 . 0
0 . 6
Intermittent failure,
system is OK at this
time (test drive may be
necessary).
Check for poor con-
nection or loose wires
at MAP sensor C534
and ECU.
problem in the Manifold Absolute
and
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0 10 15 20
,
100 2 0 0 3 0 0 400
CONTROL BOX
W H T
25
3 0
(in. Hg) GAUGE
700
(mm Hg) READING