Honda Acura NSX 1991 Service Manual page 212

, Sensor circuit or a problem in the Front Fuel Supply System.
, I
Self-diagnosis Check Engine light indicates code 44: Most likely a problem in the Rear Oxygen (02)
Sensor circuit or a problem in the Rear Fuel Supply System.
reported on.
jumped (page 11-18). CODE
43 and/or 44 are indicated.
2.
I
I
W a r m u p e n g i n e t o n o r m a l
operating temperature (cooling
fan comes on).
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Hold engine at 3,000 rpm for 2
q
minutes.
(A/T: Transmission is
Is the Check Engine light on and
does it indicate CODE 43 or
447
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With the ignition switch OFF,
wait for at least two minutes.
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Install a jumper wire on the ECU
test harness between A10 and
A26 (front): or Al2 and A26
( r e a r ) .
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Turn the ignition switch ON.
Measure voltage between D14
minal and A26 t-1 terminal as
soon as the ignition switch is
turned on.
(To page 1 I-37)
1 l-36
Flowchart - Fuel Supply System
NOTE: If 43 or 44 code are accompanied by the Check Engine light and
poor driveability, go to page 1 l-86 Fuel Supply System.
I
or B .)
Intermittent failure, system is OK
at this time (test drive may be
necessary).
Check for poor connections or
loose wires at 02 sensor C144,
Cl48 and ECU.
1
NOTE:
equivalent.
Voltage should start at
A28 i-1
0.4-0.5 V when the
ignition switch is first
turnedon. anddecrease
to below 0.1 V in less
than two minutes.
D14 (+I D16 (+I