Hyundai Sonata 1991 Shop Manual page 285

MPI SYSTEM
Engine
Oxygen sensor
Remarks
output voltage
Increase RPM
Min.O.6V Richens air/fuel mixture
Tightening torque
Oxygen sensor .
39-49 Nm (400-500 kg.cm. 29-36 Ib.lt)
(fo' U.S.A.)
31Y109
The vehicle speed sensor uses a reed type switch. The speed
sensor built in the speedometer converts the speedometer gear
revolution (vehicle speed) into pulse signals. which are sent to
the ECU.
Vehicle Speed Sensor
Inhibitor Switch (For A/T)
Refer to Group 45.
Injectors
Y31EKOA
Z31ELOA
Z31EMOA
I
Rotor
~
ffi
-==-
::>
~t·
- u
I
w
<-
~
~
31Z044
Operation Check
Using a multi-use tester. check as described below.
o Cut off the fuel injection of the injectors in sequence.
o Check the operation time of the injectors.
Operation Sound Check
using a stethoscope. check the operation sound (tick. tick) during
idle or cranking. Check that the sound is produced at shorter
intervals as the engine speed increases.
NOTE
1) Other injectors may produce sound as they operate even
if the injector being checked does not operate.
2) Ensure that the sound from an adjacent injector is not
being transmitted along the delivery pipe to an inoperative
injector.
31-60