Heater Control Valve: Testing and Inspection

1. Disconnect the 2P connector from the heater valve control solenoid valve.




2. Check for continuity between the No. 1 and No. 2 terminals of the heater valve control solenoid valve.




3. Disconnect the #2 vacuum hose from the intake manifold, then connect a vacuum pump to the #2 vacuum hose.
4. Connect battery power to the No. 2 terminal of the heater valve control solenoid valve, and ground the No. 1 terminal.
5. Check that the rod of the heater valve is pulled toward the diaphragm when vacuum is applied to the heater valve control solenoid with a vacuum pump.
6. Check that the rod is returned to the original position when power is disconnected.