Component Inspection
- Ignition "OFF".
- Remove ISCA Valve from Throttle body. Check for throttle bore, throttle plate and the ISCA passages for chocking and for any foreign objects. Repair or clean as necessary.
- Install the ISCA valve.
- Ignition "ON" & Engine "OFF".
- Install scan tool and select "IDLE SPEED ACTUATOR" parameter on the "Actuation Test" mode.
- Activates ISCA valve by pressing "STAT" key.
- Check the ISCA valve for clicking sound and visually verifying valve closes and opens.NOTE: Repeat numerous times to ensure valve reliability.
- Is ISCA Valve OK?
YES:
- Check for poor connection between PCM 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 for contamination, deterioration, or damage. Substitute with a known-good ISCA and check for proper operation. If the problem is corrected, replace ISCA and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.