Idle Control System

NOTE:
- Across each row in the chart, the sub-systems that could be sources of a symptom are ranked in the order they should be inspected, starting with "1". Find the symptom in the left column, read across to the most likely source, then refer to that "1" source listed at the top of that column. If inspection shows the system is OK, try the next system "2", etc..

- If the Idle Speed is out of specification and the Malfunction Indicator Lamp (MIL) does not blink Diagnostic Trouble Code (DTC) 14, inspection the following items:




Adjust the Idle Speed. Idle Speed
Air Conditioning Signal. A/C Signal
Alternator FR Signal. Alternator (ALT) FR Signal
Automatic Transmission (A/T) Gear Position Signal.
Brake Switch Signal. Brake Signal
Starter Switch Signal. Starter Switch Signal
Power Steering Pressure (PSP) Switch Signal. Power Steering Pressure (PSP) Switch Signal
Hoses and Connections.
IAC Valve and its mounting 0-Rings. Idle Speed/Throttle Actuator - Electronic

If the above items are normal, substitute a known-good IAC Valve and re-adjust the idle speed.

If the idle speed still can not be adjusted to specification and the MIL does not blink code 14 after IAC Valve replacement, substitute a known-good ECM and recheck. If symptom goes away, replace the original ECM.