DTC 2-2-3 Idle Air Control Valve Signal

2-2-3 IDLE AIR CONTROL VALVE SIGNAL

Condition(s) for DTC
^ The MFI module supplies pulsed ground signals to both coils of the Idle Air Control (IAC) Valve, one to the opening coil and the other to the closing coil, to maintain a constant idling speed. The DTC is recorded if the module senses a fault in the IAC valve or its wiring.

Substitute value
^ None. The control module will attempt to close the valve if the speed exceeds 1400 rpm.

Fault source(s)
^ Signal lead open-circuit.
^ Signal lead short-circuited to ground or supply.
^ Open-circuit in valve supply lead.
^ Contact resistance in connections.
^ Faulty IAC valve.

Fault symptom(s)
^ Engine is difficult to start or fails to start.
^ Low or high idling speed.