Mazda 1975 Rotary Pickup Workshop Manual page 38

1A
Note:
Avoid heating the oil to more than 130'C (266oF)'
c. Replacing heat hazard sensor
1. Remove the seat.
2. Dsconnect the coupler from the heat hazard sensor.
3. Remove the screws attaching the heat hazatd sensor
and remove the sensor.
4. Install the heat hazatd sensor by following the
removal procedures in the reverse- order.
1A-A-12.
Automatic Throttle Release System
a. Checking automatic throttle release system
1. Make sure that the engine is cold.
Pull the choke control knob out with the ignition
switch off and make sure that the knob returns
automatically. If the trouble is found, check choke
wire and choke return spring, replace if necessary'
1A-A-13.
Control Unit
a. Ghecking control unit
The control unit controls the air control valve, de-
celeration control valve, ignition system, solenoid of
the carburetor, and heat hazard warning system' So
the checking procedure of the control unit is de-
scribed together in the item of each part and each
svstem.
Warning:
1. lUhen the
use a 5-amp.
fuse
fuse
of the control unit ,J burnt out,
when replacing.
2. Start the engine and
'set the engine speed to
2,000 rpm by adjusting the choke control knob'
Warm up the engine under the above condition'
3. Make sure that the choke control knob returns
automatically when the needle of the water tempera-
ture gauge indicates the point shown in Fig. 1A-35'
Note:
If a trouble is found in the above procedure 3, check
the water temperature switch.
2. If, in checking the signal of the control unit,
there rs any terminal in the coupler to which the
signal does not come, check first for breaking of
the wire harness and faulty contact of the terminal'
3. Do not use more dran 3.4 watt lamp when checking
the signal of the control unit, using test lamp'
1A-A-14.
Water Temperature Switch
a. Ghecking operation of water temperature switch
1. Make sure that the engine is cold'
2. Remove the coupler from the water temperature
switch, and make iure of continuity between both
terminals in the coupler, using the ohmmeter'
3. Connect the coupler to the water temperature
switch.
Fig. 14-36 Control unit
Fig. 1A-34 Choke control knob
Fig. 1A-37 Fuse of control unit
4
\
T E I'1P
Fig. 14-35 Position of gauge needle