Mazda RX7. Manual — part 31

AUXILIARY CONTROL DEVICE

Article Text

1983 Mazda RX7

For www.iluvmyrx7.com

Copyright © 1998 Mitchell Repair Information Company, LLC

Sunday, August 26, 2001 04:58PM

ARTICLE BEGINNING

1983 Exhaust Emission Systems
MAZDA RX7 AUXILIARY CONTROL DEVICE

DESCRIPTION

In addition to the regular exhaust emission control systems
previously described, RX7 models use an auxiliary control device.
This unit works in conjunction with emission systems previously
explained.
The components of the auxiliary control device include the
control unit, choke switch, choke magnet, choke relay, and 2 water
temperature switches.

TESTING

CONTROL UNIT

1) Engine must be at normal operating temperature and
transmission in Neutral (Park on A/T models). Check the control unit
according to Control Unit Testing chart.
2) When more than 1 Checking Condition is listed, all
conditions must be checked. Connect the negative probe of voltmeter
to terminal "P" and positive probe to other terminals as described.
3) If a problem exists, check circuit to which terminal is
connected. If circuit is normal, replace control unit.

NOTE : Disconnect electrical coupler from throttle sensor
on carburetor and connect a known good throttle sensor
to coupler.

Fig. 1: Terminal Locations of Control Unit & Throttle Sensor
Unit is located under left side of dashboard.

AUXILIARY CONTROL DEVICE

Article Text (p. 2)

1983 Mazda RX7

For www.iluvmyrx7.com

Copyright © 1998 Mitchell Repair Information Company, LLC

Sunday, August 26, 2001 04:58PM

CHOKE RELAY

1) Disconnect coupler from relay. With engine off and no
power applied, check continuity of terminals.
2) There should be continuity between No. 1 and No. 2. There
should be no continuity between No. 3 and No. 4.
3) Connect a wire from battery positive post to terminal No.
6 and battery negative post to terminal No. 5. There should be
continuity between No. 3 and No. 4. There should be no continuity
between No. 1 and No. 2.

Fig. 2: Choke Relay Terminal Locations

CHOKE SWITCH

1) Unplug connector from choke switch. Check continuity
between numbered terminals in connector using an ohmmeter.
2) Continuity should exist between terminals No. 3 and No. 7
when choke knob is pulled to about 0.4" (10 mm.). Continuity should
exist between terminals No. 6 and No. 8 when choke knob is at any
position. See Fig. 3 for terminal locations.

Fig. 3: Choke Switch Terminal Locations

WATER TEMPERATURE SWITCHES

AUXILIARY CONTROL DEVICE

Article Text (p. 3)

1983 Mazda RX7

For www.iluvmyrx7.com

Copyright © 1998 Mitchell Repair Information Company, LLC

Sunday, August 26, 2001 04:58PM

No. 1 Switch
1) Remove switch from water pump housing. Place switch in
water with a thermometer. Connect ohmmeter to switch connector and
gradually heat water.
2) Continuity should not exist between terminals when
temperature reaches 146-170

ø

F (63-77

ø

C). If switch does not respond

as described, replace No. 1 water temperature switch.

No. 2 Switch
1) Remove switch from lower radiator tank and perform same
test as for No. 1 water temperature switch.
2) Continuity should not exist between terminals until
temperature reaches 52-66

ø

F (12-18

ø

C). If switch does not respond as

described, replace No. 2 water temperature switch.

AUXILIARY CONTROL DEVICE

Article Text (p. 4)

1983 Mazda RX7

For www.iluvmyrx7.com

Copyright © 1998 Mitchell Repair Information Company, LLC

Sunday, August 26, 2001 04:58PM

Fig. 4: Control Unit Testing

END OF ARTICLE