Idle Up Control Valve: Testing and Inspection
ON-VEHICLE INSPECTIONINSPECT 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 (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 1OO 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 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
A. Inspect idle-up valve for open circuit.
- Using an ohmmeter, check that there is continuity between the terminals.
Resistance: At 20°C (68°F): 30 - 33 Ohms
- If there is no continuity, replace the idle-up valve.
B. 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.
C. 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.