System Inspection
Test Harness Installed On Engine:
SYSTEM INSPECTION SOLENOID VALVE (SWITCH)
NOTE: Check the condition of the wiring harness and/or vacuum lines and connectors before checking the sensors or switches.
1. Warm up the engine and run it at idle.
2. Connect a tachometer to the engine.
3. Connect the SST (Special Service Tool, Mazda Part # 49 F018 001, or equivalent) to the check connector (Green: 3-pin).
Checking For Vacuum At Air Control Valve:
4. Disconnect the vacuum hose (solenoid valve (switch) to air control valve) at the switching solenoid valve.
5. Place a finger over the pipe opening.
6. Note the operation of the red lamp of the SST (Mazda Part # 49 F018 001, or equivalent) and the presence or absence of vacuum at that vacuum is felt.
Engine condition Checker lamp illumination Sucking air
Idle Red lamp does not illuminate Yes
Half throttle Red lamp illuminate No
SOLENOID VALVE (RELIEF)
1. Warm up the engine and run it at idle.
2. Connect a tachometer to the engine.
Test Harness Installed On Engine:
3. Connect the SST (Mazda Part # 49 F018 001, or equivalent) to the check connector (Green: 3-pin).
Checking For Vacuum At Solenoid Valve:
4. Disconnect the vacuum hose (Solenoid valve (Relief) to air control valve) at the relief solenoid valve.
5. Place a finger over the pipe opening.
6. Note the operation of the green lamp of the SST (Mazda Part # 49 F018 001, or equivalent) and the presence or absence of vacuum that is felt.
Engine condition Checker lamp illumination Sucking air
Idle Green lamp illuminated No
Above 3,600 rpm Green lamp does Yes
(Except deceleration) not illuminate
NOTE: The checker lamp may turn OFF at approx. 1,200 rpm. This is normal.
Heat Hazard Sensor:
7. Disconnect the heat hazard sensor connector, and connect a jumper wire to the terminals in the connector.
8. Verify that the Green lamp does not illuminate and that air sucks from the port opening at any engine speed.
9. Disconnect the jumper wire and reconnect the heat hazard sensor.
10. Start the engine and gradually increase the rpm. Check that the Green lamp does not illuminate and that air flows from the port opening when the engine speed is over 1,000-1,200 rpm.