ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5E-8190-823225--1 1096
Idle Air Control Functional Test
(2 of 2)
• START ENGINE, ALLOW IDLE TO STABILIZE, AND RECORD ENGINE RPM.
• PLACE ENGINE IN BASE TIMING OR SERVICE MODE.. DOES A
NOTICEABLE DROP IN RPM OCCUR OR DOES ENGINE DIE? SEE
NOTE.
YES
YES
NO
1A
2
1B
NOTE
IN STEP 1A:
A 502/BLACKHAWK MAY NOT
DIE, BUT IDLE WILL DROP
DRASTICALLY.
IAC CIRCUIT FUNCTIONING PROPERLY.
NO
YES
EXIT SERVICE MODE AND
RESTART ENGINE. ENGINE SPEED SHOULD
GRADUALLY RETURN WITHIN 75 RPM OF
RECORDED RPM WITHIN 30 SECONDS.
DOES IT?
• IGNITION “OFF” FOR 10 SECONDS.
• UNPLUG IAC CONNECTOR
IF CONNECTED.
• RESTART ENGINE WITH A TEST LIGHT
CONNECTED TO GROUND.
• PROBE EACH ONE OF THE FOUR IAC
TERMINALS, AND THE TEST LIGHT
SHOULD BLINK WHEN TOUCHED TO
ALL TERMINALS. DOES IT?
CHECK IAC CIRCUIT
THAT DID NOT BLINK FOR
OPEN OR SHORTED
FROM IAC HARNESS TO
J-2 CONNECTOR
CIRCUIT. IF OK,
REPLACE ECM.
STICKY OR
FAULTY
IAC VALVE.
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