1992 MAZDA PROTEGE Workshop Manual

INTAKE AIR SYSTEM F
B6
4.6-6.6 N.m (46-66 cm-kg, 40-67 in-lb)
19-25 (1.9-2.6, 14-19)
GASKET, REPLACE
?.6--ll N.m
IO-110 cm-kg,
19-95 In-lb)
7.6-11 k.m KY
- CASKET, REPLACE (60-I 10 cm-kg,
69-95 in-lb)
\I
I 19-z (1.9-2.6, 14-19) V
N.m (m-kg, ft-It
23UOFX-0
1. Resonance duct 8. Throttle body
Inspect for damage Inspection ,,,.,.,,“,,,.,................... page F-l 12
2. Air cleaner 9. Dashpot
Inspect for excessive dirt or damage Inspection ..,...........,.................. page F-l 42
3. Air cleaner element 10. ISC valve
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page F- 79 Inspection . . . . , . . . . . . . . . . . . . . . . . . . . . . . page F-l 16
4. Airflow meter 11. Dynamic chamber
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page F-l 68 Removal note. . . . . . . . . . . . . . . . . . . . . . . . . . . . page F-l 12
5. Resonance chamber 12. Air valve
Inspect for damage Inspection . , , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page F-l 16
6. Air hose 13. Intake manifold bracket
Inspect for damage 14. Intake manifold
7. Accelerator cable Installation note . . . . . . . . . . . . . . . . . . . . . . . . . page F-l 13
inspection I Adjustment .,........... page F-l 14
F-III

F INTAKE AIR SYSTEM
1 03UOFX.103
OSUOFX-I 04
1
F-112
I 03UOFX.I 05
OSUOFX-10
OSUOFX-10
THROTTLE BODY
Inspection
1. Check the throttle body for wear and deposits.
2. Check if the throttle valve moves smoothly when the throt-
tle lever is moved from fully closed to fully open.
3. Replace the throttle body if necessary.
Caution
l Do not remove the thin seal coating from the throt-
tle valves or bore.
DYNAMIC CHAMBER
Removal Note
BP DOHC
l Raise the vehicle to remove the four bolts shown in the
figure.
BP SOHC
l Raise the vehicle to remove the five bolts shown in the figure.
B6
l Raise the vehicle to remove the three bolts shown in the
figure.
Inspection (BP DOHC)
1. Check the shutter valve for wear and deposits.
2. Check if the shutter valve is fully open and moves smooth-
ly from fully open to fully closed.

INTAKE AIR SYSTEM F
I 23UOFX-096
INTAKE MANIFOLD
Installation Note
BP
1, Tighten the bolts in the order shown in the figure.
Tightening torque:
19-25 N-m (1.9-2.6 m-kg, 14-19 ft-lb)
B6
1. Tighten the bolts in the order shown in the figure.
Tightening torque:
19-25 N-m (1.9-2.6 m-kg, 14-19 ft-lb)
2. Refill the radiator with the specified engine coolant.
(Refer to page F-78.)
3. Check for engine coolant leakage.
F-113

F INTAKE AIR SYSTEM
ACCELERATOR PEDAL
Removal / Installation
1. Remove in the order shown in the figure.
2. Install in the reverse order of removal.
CLIP, REPLACE
N.m (cm-kg, in-lb)
23UOFX-OF
1. Accelerator cable 3. Clip
Inspection / Adjustment . . . . . . . . . . . . . page F-l 14 4. Return spring
2. Retainer 5. Accelerator pedal
23UOFX-OE
F-114
ACCELERATOR CABLE
Inspection I Adjustment
1. Depress the accelerator pedal fully. Check if the throttle valve
is fully opened.
2. Inspect the play of the accelerator cable.
Play: 1 .O-3.0mm (0.04-0.12 in)
3. Loosen the nuts @to adjust the play if necessary. ._ ,

.-
IDLE SPEED CONTROL (ISC) SYSTEM I-
IDLE SPEED CONTROL (ISC) SYSTEM
DESCRIPTION
BP SOHC
AIR VALVE THROTTLE SENSOR
CLUTCH SWITCT (MTX)


‘IS PRESS/URE SWITCH ‘x.

. , SIS CONNECTt
(TEN TERMINAL)
DISTRIBUTOR
INHIEITOR SWITCH (ATX)/
NEUTRAL SWITCH (MTX) 3R
To improve idle smoothness, the ISC system controls the intake air amount by regulating the bypass air amount
that passes through the throttle body. This system consists of the ISC valve, air valve, ECU and input devices.
F-115

F IDLE SPEED CONTROL (ISC) SYSTEM
PREPARATION
SST
OBUOFX-113
OSUOFX-I 14
I
23UOFX-095
J 03UOFX-1 lf
23UOFX-101
F-116
SYSTEM OPERATION
Air Valve
Note
l This inspection must be done with the engine cold.
- Engine coolant below 20°C (68°F).
1. Connect the SST to the diagnosis connector.
2. Set the switch @to position 1 and TEST SW to SELF-TEST.
3. Start the engine.
4. Check if the idle speed decreases gradually as the engine
warms up.
ISC Valve
1. Warm up the engine.
2. Check if a click sound is heard and the engine speed in-
creases to approx. 1,200 rpm when the ISC valve con-
nector is disconnected at idle.
3 If the engine speed does not change, replace the ISC valve.
4. Reconnect the connector.
ISC VALVE
Inspection
1. Disconnect the ISC valve connector.
2. Check the resistance of the ISC valve.
Resistance: 11-130 (at 20°C [68*F])
3. If not as specified, replace the ISC valve.
AIR VALVE
Inspection
1. Remove the air valve. (Refer to page F-109.)
2. Cool the air valve at below O°C (32OF).
3. Heat the air valve at @by using a drier and verify that part
@moves in the direction of the arrow in the figure.

VARIABLE INERTIA CHARGING SYSTEM (VI-)
VARIABLE INERTIA
CHARGING SYSTEM (VICS) [DOHC]
DESCRIPTION
VACUUM CHAMBER
SHUTTER VALVE ACTUATOR
F
THREE-WAY VALVE CLOSED
5,000 rpm
SHUTTER VALVE
BELOW 5,000 rpm ABOVE 5,000 rpm
SHUTTER VALVE CLOSED SHUTTER VALVE OPEN
By varying the length of the intake air path in the intake manifold and dynamic chamber, the resonance
induced inertia charging effect is improved, yielding higher torque and a wider torque band.
The length of the intake track is controlled within the intake manifold and dynamic chamber by opening and
closing the shutter valve at 5,000 rpm.
l-R; FCZz consists of the shutter valves, shutter valve actuator, three-way solenoid valve, vacuum chamber,
F-117

VARIABLE INERTIA CHARGING SYSTEM (VICS)
SYSTEM OPERATION
DIAGNOSIS 1. Connect the tachometer to the IG- terminal of the diagno- CONNECTOR sis connector.
2. Start the engine and run it at idle.
3. Verify that the rod of the shutter valve actuator has pulled -
inward.
OSUOFX-I 19
F-118
i-..
1”
03UOFX-I 2
23UOFX-1 C
23UOFX-1 C
23UOFX-IC
4. increase the engine speed gradually and verify that the rod
is extended when the engine speed reaches 5,000 rpm.
SHUTTER VALVE ACTUATOR
Inspection
1. Remove the vacuum hose from the actuator.
2. Verify that the rod can move in and out smoothly.
3. Start the engine and run it at idle.
4. Place a finger over the end of vacuum hose and verify that
there is vacuum.
5. Install the vacuum hose and verify that the rod is pulled
inward.
SOLENOID VALVE (VICS)
Inspection
1. Remove the three-way solenoid valve.
2. Verify that air flows between each port as below.
Port
@--@ - -
@-0
@ --- (g Air flow
No
No
Yes
3. Connect battery voltage and a ground to the terminals of
the solenoid valve.
4. Verify that air flows between each port as below.
Port Air flow
-_I
-I_
@- 03 Yes
@l-o No
@--0 No