Engine General Information and Diagnosis: 1A-64
2 1) Measure the resistance between terminals “A” and “C”,
terminals “B” and “D”.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
ISC valve resistance
Approx. ∞
(Terminal “A” – Terminal “C”)
(Terminal “B” – Terminal “D”)
2) If OK, then measure the resistance between terminals
“A” and “B”, terminals “C” and “D”.
ISC valve resistance
Approx. 31 kΩ at 20 °C
(Terminal “A” – Terminal “B”)
(Terminal “C” – Terminal “D”)
Is the resistance OK?
If wire is OK,
intermittent trouble or
faulty ECM.
Replace the ISC valve
with a new one.
Step Action Yes No
(A)
“A”
“C”
“B”
“D”
I831G1110066-02
(A)
“A”
“D”
“B”
“C”
I831G1110067-03
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