Initial Inspection and Diagnostic Overview

- Initial conditions:
- Engine at normal operating temperature.
- Idle speed set correctly.
- Transmission in neutral position.
- Turn the A/C switch ON.





- Using SST 09843-18020, connect terminals TE1 and E1 of the DLC1, check that idle-up occurs for approx. 3 seconds.
- Valve operation is faulty if during the idle-up period the engine speed drops by 100 rpm or more, rough idle occurs, or the engine stalls.
- Observe the idle speed for approx. 3 to 15 seconds. During this time the idle-up valve should go off, the Idle Air Control (IAC) valve half-open and idle-up should occur.
- After approx. 15 seconds, check that the idle speed does not vary greatly from the idle speed observed in previous step. The idle-up valve should now be in ON position.





- If the idle speed is increased by more 100 rpm, use a 4 mm hexagon wrench, turn the idle-up valve adjustment screw to correct the idle-up valve.
- Remove the SST 09843-18020 from the DLC1.
- Turn the A/C switch OFF.