Honda Acura NSX 1991 Service Manual page 220

reported on.
jumped (page II-18). CODE
5 is indicated.
Do the ECU Reset Procedures
(page 1 I-19).
Start the engine and keep engine
Is Check Engine light on and does
it indicate CODE 57
YES
I
Stop the engine.
Disconnect #4 hose from the
throttle body, connect vacuum
pump to the hose and apply
vacuum.
Does it hold vacuum?
YES
Connect a T-fitting from a
vacuum gauge between the
throttle body and MAP sensor.
(To page II-451
MAP Sensor (cont'd)
-Intermittent failure, system is
OK at this time (test drive may
be necessary).
-Check vacuum hoses, pipes
and connections.
secure.
VACUUM PUMP/
G A U G E
Connect a vacuum pump to the
N O
MAP sensor and apply vacuum.
Does it hold vacuum?
Replace #4 hose.
Replace MAP sensor.
Y E S