Component Inspection
- Ignition "OFF".
- Remove ISCA from Throttle body and Check for throttle bore, throttle plate and the ISCA passages for chocking and for any foreign objects. Repair or clean as necessary.
- Ignition "ON" & Engine "OFF".
- Connect scan tool and select "IDLE SPEED ACTUATOR" parameter on the "ACTUATION TEST" mode.
- Activates ISCA by pressing "STAT" key.
- Check the ISCA for clicking sound and visually verifying valve closes and opens.NOTE: Repeat numerous times to ensure valve reliability.
- Is ISCA OK?
YES:
- Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure
NO:
- Check ISCA valve for contamination, deterioration, or damage. Substitute with a known-good ISCA valve and check for proper operation. If the problem is corrected, replace ISCA valve and then go to "VERIFICATION OF VEHICLE REPAIR " procedure