Honda Acura NSX 1991 Service Manual page 308

Emission Control System
(From page 1 l-l 31)
I
Measure voltage between WHT
minal.
Is there approx 1 .2 V 7
YES
I
While watching the voltmeter,
slowly apply a continuous 8" of
vacuum to the EGR valve. Repeat
several times, completely
vacuum between.
YES
I
Does the voltage consistent1
increase/decrease as the vacuum
increases/decreases ?
YES
h o s e t o t h e
Turn the ignition switch OFF.
Connect the ECU test harness
between the ECU and connector
(page 1 I-21).
Start the engine and allow it to
idle.
(To page 1 l-l 33)
II-I 32
wire between ECU (D12) and
EGR valve lift sensor.
Substitute
ECU and recheck. If prescrib-
ed voltage is now available.
replace the original ECU.
releasing
\
Replace EGR valve.
Replace EGR valve.
a known-good
1