1987 MAZDA 626 ad blue

INSPECTION AND REPAIR 1 A
12-valve:
8-valve:
49 0249 01 OA
49 0221 251A
76G01A-058
76G01A-059
V
86U01X-087
2. Remove the valve guide from the side opposite the
combustion chamber with the SST.
3. Remove the valve guide clip (8-valve).
Installation
1. Fit the clip onto the valve guide (8 valve).
2. Gradually heat the cylinder head in water to ap-
prox. 90°C (194°F).
3. Tap the valve guide in from the side opposite the
combustion chamber with the SST until the projec-
tion height is as specified.
Valve Seat
1. Inspect the contact surface of the valve seat and
valve face for the following.
(1) Roughness
(2) Damage
2. If necessary, resurface the valve seat with a 45°
valve seat cutter and/or resurface the valve face.
3. Apply a thin coat of prussian blue to the valve face.
4. Check the valve seating by rotating the valve
against the seat.
(1) If blue does not appear 360° around the valve
face, replace the valve.
(2) If blue does not appear 360° around the valve
seat, resurface the seat.

79G01C-053

1A—51

INSPECTION AND REPAIR 1 B
2. Remove the valve guide from the side opposite the
combustion chamber with the SST.
86U01X-084
Installation
1. Gradually heat the cylinder head in water to ap-
prox. 90°C (194°F).
2. Tap the valve guide in from the side opposite the
combustion chamber with the SST until the projec-
tion height is as specified.
76G01B-124
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O") (o o
/y^X'/i— l/o\ 1| 1
Valve Seat
1. Inspect the contact surface of the valve seat and
valve face for the following.
(1) Roughness
(2) Damage
2. If necessary, resurface the valve seat with a 45°
valve seat cutter and/or resurface the valve face.
86U01X-087
3. Apply a thin coat of prussian blue to the valve face.
4. Check the valve seating by rotating the valve
against the seat.
(1) If blue does not appear 360° around the valve
face, replace the valve.
(2) If blue does not appear 360° around the valve
seat, resurface the seat.
69G01A-101
1B—37

1C INSPECTION AND REPAIR
76G01C-103
76G01C-104
76G01C-110
2. Fit the clip onto the valve guide.
3. Tap the valve guide in from the side opposite the
combustion chamber with the SST until the clip
contacts the cylinder head.
4. Check the guide protrusion height (dimension A
in the figure) is as specified.
Height:
8.3—8.8 mm (0.327—0.346 in)
Valve Seat
1. Inspect the contact surface of the valve seat and
valve face for the following.
(1) Roughness
(2) Damage
2. If necessary, resurface the valve seat to the speci-
fied angle with valve seat cutter and/or resurface
the valve face.
Angle
RF-CX IN 60° RF-CX EX 45°
RF-N IN 45° RF-N EX 45°
3. Apply a thin coat of prussian blue to the valve face.
4. Check the valve seating by pressing the valve
against the seat.
(1) If blue does not appear 360° around the valve
face, replace the valve.
(2) If blue does not appear 360° around the valve
seat, resurface the seat.
76G01C-111
1C-50

Br
m < o > mo
li 3 m
? 3D 0) O
as
n (O _ ta O
P
B
L : Blue
W: White
O : Orange
Br: Brown
Y : Yellow
G : Green
B : Black
R : Red m

B : Black
G : Green
O : Orange
L : Blue
W: White
Br: Brown
m 00 <
SL < c 3 Q.

n c (D
m
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Hose color:
G ....Green
B ....Black
W ....White
Br....Brown
L ....Blue
R ....Red
EGR modulator valve*1
EGR control valve*1
Y ....Yellow O ....Orange
Pressure regulator
Solenoid valve (EGR)
Shutter valve actuator
Solenoid valve*1
(No.1 purge control)
Solenoid valve (PRC)
Solenoid valve (VIC)
Solenoid valve*1
(No.2 purge control)
Canister
*1....Unleaded fuel only

4C CONTROL SYSTEM
Jjf (Terminal A)
n PI
WRED r^j
BLACK
BLACK 1 (Terminal C)
76G04C-189
Replacement
1. Disconnect the connector.
2. Loosen the air hose clamps.
3. Replace the air flow sensor.
Caution
Install the air flow sensor so that the arrow on
the sensor aligns with air flow direction.
4. Tighten the hose clamps.
5. Reconnect the connector to the sensor.
THROTTLE SENSOR
Caution
Use a precision voltmeter with a scale of 0.01V
to inspect or adjust the throttle sensor. If it
is not available, replace the throttle sensor
and throttle body as an assembly.
Inspection
1. Disconnect the throttle sensor connector (3-pin).
2. Connect the SST between the throttle sensor and
the wiring harness.
3. Turn the ignition switch ON.
4. Measure BLACK and RED wire voltages.
Specifications:
BLACK—Approx. OV
RED—4.5—5.5V
5. If not correct, check the battery voltage and wir-
ing harness. If these are OK, replace the engine
control unit.
6. Using the RED wire voltage as a guide, find the
specified BLUE wire voltage ranges in the table.
RED wire voltage
Specified range (V) RED wire voltage Fully close Fully open
4.90—4.99V 0.40-0.58 3.90-4.60
5.00—5.09V 0.41—0.60 3.97-4.70
5.10-5.19V 0.42—0.61 4.05—4.79
4C-104

CONTROL SYSTEM 4C
7. Make sure that the throttle valve is fully closed.
8. Check that the BLUE wire voltage is within the
specified range.
9. Adjust the throttle sensor if necessary
76g04c-191
10. Open the throttle valve fully.
11. Check that BLUE wire voltage is within the speci-
fied range.
12. If not correct, replace the throttle sensor.
76g04c-192
13. Turn the ignition switch OFF.
14. Disconnect the SST and reconnect the throttle sen-
sor connector.
15. Disconnect the negative battery terminal and de-
press the brake pedal for 5 seconds to eliminate
the malfunction memory from the control unit.
76g04c-193
Adjustment
1. Perform steps 1 to 7 in the inspection procedure.
2. Connect the voltmeter to the BLUE wire.
3. Loosen the throttle sensor mounting screw.
76G04C-194
4C-105