Idle Speed/Throttle Actuator - Electronic: Testing and Inspection

NOTE: Bypass Air Control (BAC) Valve consists of the air valve and idle air control valve.

SYSTEM OPERATION

Tachometer Hook-Up:

NOTE: Check idle speed with coolant fan not operating.

1. Warm engine to operating temperature.
2. Turn all electrical loads "OFF."
3. Connect tachometer to data link connector terminal IG-.
4. Verify idle speed is within specification under conditions described on image chart:

Idle Speed Table:

BAC VALVE

Air Valve

SST Connection / Air Valve Check:

NOTE: Inspection must be done with engine cold - coolant temperature below 68°F (20°C).

1. Connect SST. Set system select to position 1 and test switch to SELF TEST.
2. Start engine and verify idle speed decreases gradually as engine warms up.

Idle Air Control Valve

Idle Air Control Valve Resistance:

1. Remove throttle body.
2. Measure resistance across valve terminals.

RESISTANCE: 10.7 - 12.3 Ohms @ 68°F (20°C)

3. If not as specified, replace BAC valve.