Isuzu 1999 RODEO Workshop Manual page 724

Idle Air Control (IAC) System Check (Cont'd)
Step
6 1. Install the appropriate IAC noid light from J
39027–A into the powertrain control module
harness.
2. Cycle the IAC motor analyzer J 39027–A and
observe the noid lights.
3. Both the lights should cycle red and green, but
never OFF, as the RPM is changed over its range.
Do the noid lights cycle red and green?
7 1. Use the other connector on the IAC motor analyzer
J 39027–A pigtail.
2. Check the resistance across the IAC coils. Measure
the resistance between terminal A and terminal B.
3. Measure the resistance between terminal C and
terminal D.
Is the resistance within the specified range?
8 If the circuits did not test green and red, check the
following:
f
Faulty connector terminal contacts
f
Open circuits, including connections
f
Circuits shorted to ground or voltage
f
Faulty powertrain control module connector(s) or
powertrain controlmodule.
Are repairs necessary?
9 1. Check the resistance between the IAC terminal B
and terminal C.
2. Check the resistance between the IAC terminal A
and terminal D.
Is the resistance infinite?
10 Replace the IAC. Refer to On–Vehicle Service, Idle Air
Control Valve.
Is the action complete?
11 Check the IAC valve and circuit.
Are the IAC valve and circuit OK?
12 Replace the IAC. Refer to On–Vehicle Service, Idle Air
Control Valve.
Is the action complete?
13 Repair or replace the faulty component(s).
Is the action complete?
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Action Value(s) Yes
— Go to Step 7
40–80 W
Go to Step 9
Go to Step 13
—
Go to Step 11
—
— Go to Step 7
Refer to
Diagnostic
Aids
—
— Go to Step 9
— Go to Step 6
6E1–97
No
Go to Step 8
Go to Step 10
—
Go to Step 12
—
Go to Step 12
—
—