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 a jumper wire, 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 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 jumper from the DLC1.
- A/C switch OFF.


A/C IDLE-UP VALVE INSPECTION

1. REMOVE A/C IDLE-UP VALVE.
- Disconnect the idle-up valve connector



- Disconnect the 2 air hoses.
- Remove the 2 bolts and idle-up valve.

2. INSPECT A/C IDLE-UP VALVE.
^ Inspect idle-up valve for open circuit



- Using an ohmmeter, check that there is continuity between the terminals.

Resistance @ 2O°C (68°F): 30 - 33 Ohms

- If there is no continuity, replace the idle-up valve.

^ Inspect A/C idle-up valve for ground.



- Using an ohmmeter, check that there is no continuity between each terminal and the body.
- If there is continuity, replace the idle-up valve.

^ Inspect A/C idle-up valve operation



- Check that air does not flow from port E to port F.
- Apply battery positive voltage across the terminals.



- Check that air flows from port E to port F. If operation is not as specified replace the idle-up valve.

3. REINSTALL A/C IDLE- UP VALVE.



- Install the idle-up valve with the 2 bolts.
- Connect the 2 air hoses.
- Connect the idle-valve connector.