Mazda 1975 Rotary Pickup Workshop Manual page 32

1A
{-
I
Itl
I
Note:
1. If a trouble is found in the above procedure 4,
check every part according to Par. lA-8. Trouble
Check Guide.
2. lf a trouble is found in the above procedure 5,
replace the air control valve.
b. Checking signal of control unit
Manual transmission:
1. Remove the coupler from the solenoid of the air
control valve and connect the voltmeter to the coupler.
Fig. 1A-9 Checking signal of control unit (M/T)
2. Start the engine and keep it running at idle speed'
3. Make sure that the current is not flowing to the
voltmeter at this time.
4. Gradually raise the engine speed and make sure
that the current begins flowing to the voltmeter at
4,0m t 400 rpm.
5. Make sure that the current begins flowing to the
voltmeter when the idle switch is pushed with the
engine speed kept at 2,000 rpm .
Note:
If a trouble is found in the above procedures 3,4 and
5, check every part according to Par. 1A-8. Trouble
Ctreck Guide.
Automatic Transmission:
1. Remove the coupler from the solenoid of the
From control unit
ff\
\
V
: #
Fig. 14-10 Checking signal of control unit (A/T)
l A : 3
air control valve and connect the
coupler.
2. Remove the coupler from the
switch and close both terminals in
voltmeter to the
water temperature
the coupler.
Fig. 1A-11 Closing both terminals
3. Start the engine and keep it running at idle speed.
Make sure that the current is not flowing to the
voltmeter at that time.
4. Keep the engine speed at 2,000 rpm by adjusting
the choke control knob.
5. Next, gradually raise the engine by operating the
throttle speed and make sure that the current begins
flowing to the voltmeter at 4,800 + 400 rpm.
6. Push the choke contgtrl knob in to idle the engine.
7. Raise the engine #.d from its idle speed by
operating throttle and make sure that the current
begins flowing to the voltmeter at 4,000 I 400 rpm.
8. Make sure that the current begins flowing to the
voltmeter when the idle switch is pushed with the
engine speed kept at 2,000 rPm.
Note:
If a trouble is found in the above procedures 3, 5, 7
and 8, check every part according to Par. 1A-8.
Trouble Check Guide.
c. Replacing air control valve
1. Remove the hot air duct for the air cleaner.
2. Disconnect the air hose (uit pump -
air control
valve) from the air control valve.
3. Dsconnect the air hose (air control valve - thermal
reactor) from the air control valve.
4. Disconnect the vacuum and atmospheric sensing
tubes from the air control valve.
5. Disconnect the coupler from the air control vlave.
6. Remove the nuts attaching the air control vlave
and remove the air control vlave.
7. Install the air control valve by following the removal
procedures in the reverse order.
1A-A-5.
Deceleration Control Valve
a. Checking deceleration control valve
1. Dsconnect the air hose (air cleaner - deceleration
control valve) from the air cleaner.
2. Tun the ignition switch on.
3. Open and close repeatedly the terminal of each
solenoid of the deceleration'control valve, and make
f
t
t c
d t
ts
]H
i
F r o m c o n t r o l u n i t
,f
erminal
/t"\
\
V
3 #