Protege LX L4-1489cc 1.5L DOHC MFI (1998)
Idle Speed: Testing and Inspection
IDLE AIR CONTROL INSPECTION
1. Start the engine and run it at idle.
2. Disconnect the IAC valve connector and verify that the engine rotation changes.
3. If the engine condition will not change, do as follows.
(1) Connect the SSTs (NGS) to the data link connector-2.
(2) Verify that diagnostic trouble code No. P0505 is not displayed. If code No. P0505 is shown, carry out troubleshooting of the code No. P0505.
(3) Select the SIMULATION TEST function on the NGS display.
(4) Change the duty value of the IAC valve to 100% by using the "IACV" and verify that the idle speed increases.
(1) If the idle speed increases, replace the PCM.
(2) 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.
5. Turn the electrical loads ON and verify that the engine speed is within the specification.
Engine speed (rpm)
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.
