Chapter 4 Fuel and exhaust systems
Idle speed control
servo connector
21.2 Using an ohmmeter or multimeter at the connector
terminals, check the continuity of the ISC servo coil and
compare your measurement with the resistance listed in
this Chapter’s Specifications (2.4L engine)
21.5 On the 3.OL engine, the ISC servo is located under
the throttle body
.21.8 Using an ohmmeter or multimeter, check the continuity
of the ISC servo connector at the indicated terminals and
compare your measurements with the resistance listed in this
Chapter’s Specifications (3.OL engine)
21 Idle Speed Control (ISC) servo-check and replacement
Check
2AL.engine
Refer to illustration 21.2
1 Unplug the electrical connector for the Idle Speed Control (ISC) ier-
vo.
2 Using an ohmmeter or multimeter at the connector terminals (1 and
2), check the resistance of the EC servo
coil (see
illustration). Compare
your measurement with the resistance
listed in this Chapter’s Specifica-
tions.
3 Hook ~?p a 6V DC battery between terminal 1 and terminal 2 of the
connector for the ISC servo and verify that the ISC servo is operating.
Caution: Don’t use a more powerful battery or you may lock the gears in-
side the /SC servo.
4 If the ISC servo fails to operate when powered up by a 6V DC battery,
or if the indicated resistance is outside the specified resistance, replace
the servo as an assembly.
3.OL engine
Refertoillustrations21.5,21.8and21.12
5 Listen to the ISC servo (see illustration) while an assistant turns the
ignition switch to On (not to Start). The servo should make an audible
sound.
6 If the servo is silent, inspect the electrical circuit. If the circuit is in good
shape, the likely cause is a malfunction of the servo or the engine control
unit.
7 Unplug the ISC servo electrical connector.
21.12 Holding the ISC servo as shown, power it up with a 6V
DC battery by touching the terminals of the electrical
connector in the sequence described in the accompanying text
8 Measure the resistance between terminals 2 and 1, and between ter-
minals 2 and 3 (see illustration) and compare your reading to the resis-
tance listed in this Chapter’s Specifications.
9 Measure the resistance between terminals 5 and 6, and between ter-
minals 5 and 4 and compare your reading to the resistance listed in this
Chapter’s Specifications.
IO Remove the throttle body (see Section 20).
11 Remove the ISC servo (see below).
12 Hook up the positive terminal of a 6V DC battery to terminals 2 and 5
(see illustration).
13 Holding the ISC servo as shown in the preceding illustration, hook up
the negative terminal of the6V DC battery to each terminal of the connec-
tor in the following sequence and note whether there’s any vibration (a
very slight shaking of the servo) as the motor is activated.
1) Connectthe negative battery terminal toconnectorterminals3 and 6.
2) Connect the negative battery terminal tqconnectorterminals 1 and6.
3) Connectthenegative batteryterminaltoconnectorterminals 1 and4.
4) Connect the negative
battery terminal toconnectorterminals3and4.
5) Connectthenegative batteryterminaltoconnectorterminals3and6.
6) Repeatthe above five steps in the reverse sequence (5 through 1).
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