Hyundai Sonata 1991 Shop Manual page 286

MPI SYSTEM
Resistance Measurement Between Terminals
1. Disconnect the connector for the injector.
2. Measure the resistance between the terminals.
Standard value 13-16 !1 [at 20°C (68°F)]
3. Connect the connector for the injector.
o
o
31Y113
Idle Speed control (ISC) Servo
Z31ENOB
1. Measure resistance between terminal 1 and 2 using an
ohmmeter.
Standard value
5-35!1 [at 20°C (68°F)]
Reverse {-I
2
Forward
(+)
2. Connect 6V DC to terminals 1 and 2 and check that the idle
speed control servo extends and retracts by itself.
Idle speed control
servo motion
When terminal 2 is
+
Retracts
When terminal 1 is +
Extends
If the idle speed control servo does not move, replace the
idle speed control servo assembly.
CAUTION
Apply only a 6V DC or lower voltage. Application of higher
voltage could cause locking of the servo gears.
4. If the servo does not operate, replace it as an assembly.
ISC
motor connector
side
(Front view)
31Z271
ISC motor connector side
Forward Reverse
1,1, '1'1
(Front view)
31Z272
31-61