Initial Inspection and Diagnostic Overview

INSPECT A/C IDLE-UP VALVE OPERATION.
- Initial conditions:
- Engine at normal operating temperature.
- Idle speed set correctly.
- Transmission in neutral position.
- A/C switch ON.





- Using SST, connect terminals TE1 and E1 of the DLC1, check that idle-up occurs for approx. 3 seconds. SST 09843-18020
- 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 IAC valve half-open and idle-up should occur.
- Check that the idle speed after approx. 15 seconds, does not vary greatly from the idle speed observed in step (c)
- The idle-up valve should now be in ON position.





- If the idle speed is increased by more 100 rpm. using a 4 mm hexagon wrench, turn the idle-up valve adjustment screw to correct the idle-up valve.
- Remove the SST from the DLC 1.
- A/C switch OFF.