Secondary Air Control System

1. Operate engine until normal operating temperature is obtained, then switch engine off.
2. Connect a suitable tachometer to engine.
3. Connect a voltmeter to relief solenoid valve electrical connector terminals.
4. Disconnect electrical connector from throttle and connect a jumper wire to (A) and (C) terminal in the electrical connector.
5. Start engine and increase engine speed. Ensure current begins to flow to terminal at 3600 - 4400 RPM.
6. Disconnect electrical connectors from No. 2 water temperature switch on the radiator. Slowly decrease engine speed from 2000 RPM and ensure current stops flowing to terminal when engine speed is 1,000 - 1,100 RPM.
7. Disconnect jumper wire and connect electrical connector to the throttle sensor.
8. Slowly increase engine speed from idle with throttle and ensure current does not flow to terminal at any engine speed.
9. Disconnect electrical connector from No. 1 water temperature switch and connect a jumper wire to both electrical connector terminals. Completely pull out choke knob and ensure current flows to terminal. Push back choke knob.
10. Disconnect electrical connector from heat hazard sensor and ensure current flows to terminal at all engine speeds.
11. Disconnect jumper wire and connect electrical connector from No. 1 water temperature switch.

Relief Solenoid Valve
1. Disconnect vacuum hose from solenoid valve and vacuum pipe.
2. Blow air through the solenoid valve from the vacuum hose. Ensure air flows through the solenoid valve and out the vacuum pipe.
3. Disconnect the electrical connector from relief solenoid valve and connect battery voltage to valve terminals. Blow air through the relief solenoid valve, ensure air flows through relief solenoid valve and out from the air filter valve.


Air Control Valve
1. Operate engine until normal operating temperature is obtained, then switch engine off.
2. Connect a suitable tachometer to the engine and disconnect air hose from air cleaner.
3. Disconnect vacuum hoses from relief solenoid valve and connect a suitable vacuum hose to the vacuum pipe so manifold vacuum can be directed to the air valve.
4. Start and operate engine at idle. Place a finger over air hose opening and ensure air does not flow out from the hose opening. Ensure air flow, when vacuum hose is disconnected.
5. Connect vacuum hose and increase engine speed to 2,500 RPM with the throttle. Ensure air flows out from vacuum hose when disconnecting vacuum hose from switching solenoid valve. Ensure no air flows when the vacuum hose is disconnected.