Idle-Up System
- To check vacuum switching valve, remove vacuum switching valve from vehicle. See IDLE-UP VACUUM SWITCHING VALVE LOCATIONS table. Air should not flow through vacuum switching valve ports. Connect 12 volts to one wire terminal on valve and ground other terminal. Air should flow through ports. See Fig 1. Resistance between vacuum switching valve terminals should be 37-44 ohms.CAUTION: There are 2 idle-up vacuum switching valves on Vans with A/C. One valve is controlled by the A/C amplifier. When A/C idle-up valve is turned on, signal is input to ECU "ACV" terminal.
- On vehicles with A/C, check coolant temperature switch. When coolant is below 217°F (103°C), there should be no continuity between temperature switch terminal and body of switch. There should be continuity when coolant temperature is above 230°F (110°C). Replace switch if defective.
NOTE:
Coolant temperature switch has single Green wire and is connected to "TSW" terminal on ECU. It is not the same as ECU coolant temperature sensor.
IDLE-UP SYSTEM VACUUM SWITCHING VALVE LOCATIONS
| Model | Location |
|---|---|
| Van | Right side of engine compartment (Black & Yellow/Red wires) |