- Connect Super Star II scan tool to diagnostic connector. Enter KOER self-test. See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section below. Observe scan tool readout. After Code 11 or 111 has been displayed, unlatch and then, within 4 seconds, latch STI button. «TESTS W/CODES - EEC-V (4.6L)»(ref-22907) (for Cougar & Thunderbird) «TESTS W/CODES - EEC-IV (4.6L)»(ref-22908) (all others)
- A single pulse tone indicates that entry mode has been successfully entered. If a constant tone, solid light or STO LO is displayed, base idle speed is within range and adjustment is not necessary. Exit self-test.
- If a beeping tone, flashing light or STO LO at 8 Hz is displayed, Throttle Position (TP) sensor is out of range and should be checked. See THROTTLE POSITION (TP) SENSOR. Repeat KOER self-test.
- If a beeping tone, flashing light or STO LO at 4 Hz is displayed, base idle speed is too high. DO NOT clean throttle bore. Turn air trim screw clockwise until conditions in step 2) are obtained. (Scheme 4) Go to step 6).
- If a beeping tone, flashing light or STO LO at one Hz is displayed, base idle speed is too low. DO NOT clean throttle bore. Turn air trim screw counterclockwise until conditions in step 2) are obtained. (Scheme 4) Go to step 6).
- Perform KOEO self-test to ensure trouble codes do not exist in PCM memory. See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section below. Move throttle plate to ensure it is not stuck in bore and linkage is not keeping throttle from closing. «TESTS W/CODES - EEC-V (4.6L)»(ref-22907) (for Cougar & Thunderbird) «TESTS W/CODES - EEC-IV (4.6L)»(ref-22908) (all others)
Scheme 4
Note. If electric cooling fan comes on, discontinue testing until fan goes off.