Relief Solenoid Valve Signal Check
- Warm engine to normal operating temperature. Connect tachometer to engine. Disconnect connector from throttle sensor and connect a jumper wire between terminals "A" and "C" of connector. See Fig 1 .
- Disconnect the vacuum sensing tube (from relief solenoid valve to pipe) at the pipe. Place a finger over the vacuum sensing tube opening. Start engine. Air should be sucked into the tube.
- Increase engine speed. Air should not be sucked into the tube when engine speed is 3600-4400 RPM or higher. Disconnect the connector from the catalyst thermosensor. Gradually increase the engine speed and make sure that air is not sucked into the tube when the engine speed is 1000-2000 RPM or higher.
- Reconnect the connector to the catalyst thermosensor. Disconnect the jumper wire and connect the connector to the throttle sensor. Disconnect the sensor from the heat hazard sensor and connect a jumper wire to both terminals of the connector. Make sure that air is not sucked into the tube at any engine speed.
- Disconnect the jumper wire and connect the connector to the heat hazard sensor. Stop the engine and disconnect the connector from the number 2 water temperature switch on the radiator. Disconnect the connector from the number 1 water temperature switch.
- Connect a jumper wire to both terminals of the connector. Pull the choke knob out about .6" (15 mm). Start the engine. Gradually increase the engine speed and make sure that air is not sucked into the tube when the engine speed is 1000-2000 RPM or more.
- Connect the vacuum sensing tube to the pipe. Stop the engine and connect the jumper wire. Connect connector to the number 1 water temperature switch.