RPM Too Low When Warm

Check in Order Listed:

^ Engine Control Module
Check Malfunction Indicator Light (MIL) action (see How to Display and Read Diagnostic Trouble Codes). Is MIL coming on/are codes stored/is light on steady?

^ Idle RPM is below Specification (No Load)
Idle Air Control (IAC) Valve - Perform Idle Air Control Valve tests as shown for Diagnostic Trouble Code (DTC) 14.
Idle Adjusting Screw - Perform inspection/adjustment procedure for Idle Adjusting Screw.

^ Idle speed does not increase after initial start up
Idle Air Control Valve IAC - Perform Idle Air Control Valve tests as shown for DTC 14.

^ On models with automatic transmission, the idle speed drops in gear
A/T Shift Position Signal - Perform test of Shift Position Signal system.
IAC - Perform IAC Valve tests as shown for DTC 14.

^ Idle speed drops when air conditioner is on
Air Conditioning Signal - Perform test of Air Conditioning Signal.
IAC Valve - Perform IAC Valve tests as shown for DTC 14.

^ Idle speed drops when steering wheel is turning
Power Steering Pressure Switch Signal - Perform test of Power Steering Pressure Switch.
IAC - Perform IAC Valve tests as shown for DTC 14.

^ Idle speed fluctuates with electrical load
Alternator FR Signal - Perform test of Alternator FR Signal.
Idle Air Control Valve IAC - Perform Idle Air Control Valve tests as shown for DTC 14.

^ Idle speed drops when applying brakes.
Brake Switch Signal - Perform test of Brake Switch Signal.
IAC Valve - Perform Idle Air Control Valve tests as shown for DTC 14.