Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Idle Air Control (IAC) System Test

This test is conducted check to IAC system for proper operation. Tech 2 must be used for this test.

Test Procedure:
1. Connect Tech 2 to the vehicle DLC.
2. Run the Engine at idle.




3. Select F3: Miscellaneous Test in the Application Menu.




4. Select F3: IAC System Test in the Miscellaneous Test.




5. Select F1: IAC Control Test.




6. Push Increase or Decrease soft key.
7. Control IAC system and check a data list.
F0: IAC Control
8. Select F1: IAC Reset.
9. Push Reset IAC soft key.
10. Control IAC Reset and check data list.




11. If data list changes, the IAC has been Reset.