Switching Solenoid Valve Signal Check
- Warm engine to normal operating temperature. Connect tachometer to engine. Connect voltmeter to negative terminal (Light Gray) of switching solenoid valve connector.
- Disconnect throttle sensor connector and connect a jumper wire between terminals "A" and "C" of connector. Start engine and run at 2000 RPM. Voltmeter should read near 0V. Slowly decrease engine speed and watch voltmeter.
- Voltmeter should read near 12V when engine speed is 1000-1200 RPM. Disconnect No. 1 water temperature switch (located behind alternator) and connect a jumper wire between both terminals in connector.
- Pull out choke knob and check that voltmeter reads near 12V. Push choke knob back in. Remove jumper wire from throttle sensor connector and reconnect connector.
- Slowly increase engine speed from idle. Voltmeter should read near 12V at any engine speed. Quickly accelerate engine; there should be NO current flow to switching valve. If switching valve does not respond as outlined, replace switching solenoid valve.