Leganza CDX L4-2.2L DOHC D-TEC MFI (1999)
Steps 11 - 19
Test Description
The number(s) below refer to step(s) on the diagnostic table.
2. The idle air control (IAC) valve is extended and retracted by the IAC driver. IAC valve movement is verified by an engine speed change. If no
change in engine speed occurs, the valve can be removed from the throttle body and tested. Connect the IAC driver to the removed IAC valve and
turn the ignition ON. Do not start the engine.
5. This step checks the quality of the IAC valve movement in step 2. Fully extending the IAC valve may cause an engine stall. This may be normal.
6. Steps 2 and 5 verify proper IAC valve operation. This step checks the IAC circuit for a wiring or engine control module (ECM) fault.
Idle Air Control Valve Reset Procedure
Whenever the battery cable or the engine control module (ECM) connector or the ECM fuse EF22 is disconnected or replaced, the following idle learn
procedure must be performed:
1. Turn the ignition ON for 5 seconds.
2. Turn the ignition OFF for 10 seconds.
3. Turn the ignition ON for 5 seconds.
4. Start the engine in park/neutral.
5. Allow the engine to run until the engine coolant is above 85 °C (185 °F).
6. Turn the A/C ON for 10 seconds, if equipped.
7. Turn the A/C OFF for 10 seconds, if equipped.
8. If the vehicle is equipped with an automatic transaxle, apply the parking brake. While pressing the brake pedal, place the transaxle in D (drive).
9. Turn the A/C ON for 10 seconds, if equipped.
10. Turn the A/C OFF for 10 seconds, if equipped.
11. Turn the ignition OFF. The idle learn procedure is complete.
