Relief Solenoid Valve Signal Check
- Warm engine to normal operating temperature. Connect tachometer to engine. Connect voltmeter to relief solenoid valve connector terminals.
- Disconnect connector from throttle sensor and connect a jumper wire between terminals "A" and "C" of connector. See Fig 1 . Start engine and increase engine speed.
- Voltmeter should read near 0V when engine speed is 3600-4400 RPM. Set engine speed at 2000 RPM. Disconnect No. 2 water temperature switch (located on radiator) electrical connector.
- Slowly decrease engine speed from 2000 RPM and watch voltmeter. When engine speed is 1000-1200 RPM, voltmeter should read near 12V. Decrease engine speed to idle.
- Remove jumper wire from throttle sensor connector and reconnect throttle sensor connector. Slowly increase engine speed from idle (with throttle) and watch voltmeter. The voltmeter should read 12V at any engine speed.
- The voltmeter should read near 0V if engine is accelerated quickly. Disconnect electrical connector from No. 1 water temperature switch (located behind alternator) and connect a jumper wire between both terminals of connector.
- Pull out choke knob and check that NO current flows to relief solenoid valve. Push choke knob back in. Reconnect No. 1 and No. 2 water temperature switch and disconnect jumper wire.
- Remove passenger seat and fold back carpeting to expose heat hazard sensor wiring. Disconnect heat hazard sensor connector and connect a jumper wire to both terminals in the connector.
- Voltmeter should read 0V at any engine speed. Reconnect heat hazard sensor. If relief solenoid valve does not operate as outlined, check heat hazard sensor and retest relief solenoid valve.