Idle Speed Control Check

CIRCUIT DESCRIPTION

Engine Control Schematics: MAF/IAT Sensor And IAC Valve:

Refer to MAF/IAT Sensor and IAC Valve for an electrical diagram of this circuit.

The Idle Speed Control Check verifies proper IAC valve operation.

DIAGNOSTIC AIDS
Reviewing the Failure Records may help diagnose an intermittent failure by showing how long ago and under what conditions a DTC has set.

TEST DESCRIPTION

Steps 1 - 3:

The number below refers to the step number on the diagnostic table.
3. This check test the IAC valve to make sure that it is moving in and out without binding. When the IAC valve is commanded the PCM adjusts the IAC position and spark advance for a desired RPM.