Idle Air Control Functional Testing
IDLE AIR CONTROL INSPECTION1. Start the engine and run it at idle.
2. Disconnect the Idle Air Control (IAC) valve connector and verify that the engine rotation changes.
3. If the engine condition will not change, do as follows.
A. Connect the Special Service Tools (SST)s New Generation Star (NGS) tester to the data link connector-2.
B. verify that diagnostic trouble code No. P0505 is not displayed. If code No. P0505 is shown, carry out troubleshooting of the code No. P0505.
C. Select the SIMULATION TEST function on the NGS display.
D. Change the duty value of the IAC valve to 100% by using the "IACV and verify that the idle speed increases.
I. If the idle speed increases, replace the PCM.
II. If the idle speed does not change. Replace the IAC valve.
4. Warm up the engine to normal operating temperature and run it at idle.
Idle Speed Under Load:
5. Turn the electrical loads ON and verify that the engine speed is with in the specification.
Engine Speed 700 - 800 rpm Under Load.
NOTE: Excludes temporary idle speed drop just after the electrical loads are turned on.
6. If not as specified, check the related switches and wiring harnesses.