Content .. 28 29 30 31 ..

Mazda RX7. Manual - part 30

AIR INJECTION SYSTEM

Article Text (p. 4)

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:57PM

Fig. 3: Testing Relief Solenoid Valve

RELIEF SOLENOID VALVE SIGNAL CHECK TEST

1) Warm engine to normal operating temperature. Connect
tachometer to engine. Connect voltmeter to relief solenoid valve
connector terminals.
2) Disconnect connector from throttle sensor and connect a
jumper wire between terminals "A" and "C" of connector. See Fig. 4.
Start engine and increase engine speed.
3) 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.
4) 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.
5) 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.
6) 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.

AIR INJECTION SYSTEM

Article Text (p. 5)

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:57PM

7) 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.
8) 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.
9) 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.

Fig. 4: Testing Relief Solenoid Valve Signal

SWITCHING SOLENOID VALVE TEST

1) Disconnect vacuum sensing tubes from switching solenoid
valve and vacuum pipe. Blow through switching valve from vacuum
sensing tube "B" in Fig. 5. Air should pass through valve and escape
from front port.
2) Disconnect electrical connector from switching valve and
connect battery power to terminals on valve.
3) Blow through hose again; air should pass through valve
and escape through filter at rear of valve. If switching valve does
not respond as described, replace switching solenoid valve.

SWITCHING SOLENOID VALVE SIGNAL CHECK TEST

1) Warm engine to normal operating temperature. Connect
tachometer to engine. Connect voltmeter to negative terminal (Light
Gray) of switching solenoid valve connector.
2) 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

AIR INJECTION SYSTEM

Article Text (p. 6)

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:57PM

speed and watch voltmeter.
3) 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.
4) 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.
5) 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.

Fig. 5: Testing Switching Solenoid Valve

HEAT HAZARD SENSOR TEST

1) Turn ignition on; "Overheat Exh. System" warning light
should glow. Start engine and warning light should go out. Remove
passenger seat, fold back carpeting and disconnect heat hazard sensor
connector.
2) Warning light should glow when jumper wire is connected
to both terminals of the connector. If warning light does not respond
as outlined, remove and test sensor. Wrap sensor and a thermometer in
aluminum foil (electrical connector must be exposed for access).

AIR INJECTION SYSTEM

Article Text (p. 7)

1983 Mazda RX7

For www.iluvmyrx7.com

Sunday, August 26, 2001 04:57PM

3) Place sensor and thermometer (wrapped in aluminum foil)
in container filled with oil. Place a second thermometer in container
of oil. See Fig. 6.
4) Connect a battery and test lamp to sensor connector. Test
lamp should glow. Gradually heat oil. Test lamp should go OFF when
temperature inside aluminum foil is 248-284

F (120-140

C). If sensor

does not respond as outlined, replace heat hazard sensor.

NOTE: Do not heat oil above 302

F (150

C).

Fig. 6: Testing Heat Hazard Sensor

END OF ARTICLE

Content .. 28 29 30 31 ..