oil MAZDA 626 1987 Workshop Manual

1 0 ELECTRONICALLY-CONTROLLED POWER STEERING
12. Stake the washer in two places with a punch.
86U10X-201
13. Install the boot. Wrap a new wire around it two
times and twist it 4 to 4.5 times.
Caution
Be sure that the boot is not twisted or dented.
86U10X-202
14. Install the tie-rod ends, aligning them with the marks
made before disassembly.
86U10X-203
15. Install the solenoid valve and pressure switch.
16. Align the oil pipes with the marks made before dis-
assembly, then tighten them.
86U10X-204
10—82

OIL PUMP 1 0
OIL PUMP
REMOVAL AND INSTALLATION
1. Jack up the front of the vehicle, and support it with safety stands.
2. Remove in the order shown in the figure, referring to the removal note for specially marked parts.
3. Install in the reverse order of removal.
4. Tighten all nuts and bolts to the specified torque, referring to the figure.
Note
a) The power steering fluid will leak out when the return hose or the pressure hose is dis-
connected. Prepare a suitable container for it to drain into.
b) After installation, inspect the deflection of the oil pump belt and bleed the air from the
system, then check for fluid leakage. 2WS (Gasoline engine)
76G10X-041
4. Bracket
5. Oil pump
6. Oil pump pulley
1. Belt
2. Nut
3. Pipes
10—83

1 0 OIL PUMP
4WS
16—23 N-m (1,6-2.3 m-kg, 12-17 ft-lb)
39—59 N m (4.0—6.0 m-kg, Z9—43 ft-lb)
37—52 N-m (3.8—5.3 m-kg, 27—38 ft-lb^.
(1.6-2,3 m-kg, 12-17 lt-!b)
31—46 N-m (3.2—4.7 m-kg, 23—34 ft-lb)
88—98 N-m (9.0—10.0 m-kg, 65—72 ft-lb)
49—59 N-m (5.0—6.0 m-kg, 36—43 ft-lb)
1. Belt
2. Nut
3. Pipes
4. Bracket
5. Oil pump
6. Oil pump pulley
Removal Note
Oil pump (2WS Gasoline engine, 4WS)
1. Hold the oil pump pulley with the SST, and remove
the pulley nut.
2. Slide the pulley forward. Remove the hose, pipes,
and the pump.
3. Remove the pulley.
76G10X-016
10—84

1 0 OIL PUMP
2WS (Diesel engine, without CX)
78—11 N>m (D.e—1.1 m-kg, 5.6—8.0 ft-lb}
49-59 N-m (5.0—6.0 m-kg, 36—43 ft-lb)
76G10X-042
1. Drive belt cover
2. Belt
3. Nut
4. Oil pump pulley
5. Pipes
6. Bolt
7. Bolt
10-85

1 0 OIL PUMP
2WS (Diesel engine, with CX)
r.a-11 N-m (0-8—1.1 m-kg. 5.8—8.0 tt-lb)
7.8—11 Nm (0,8—1.1 m-kg, 5.8—8.0 ft-lb)
7.8—11 Nm (0.8-1.1 m-kg, 5.8-8.0 ft-lb)
C3DSP-J
39-59 N-m (ED (4,0—6.0 m-kg, (7) ZB—43 ft-lb)
49—59 N m (5.0—6.0 m-kg, 36—43 ft-lb)
37—62 N-m (3.8—S.3 m-kg, 27—38 ft-lb)
76G10X-017
1. Drive belt cover
2. Belt
3. Cooling fan
4. Intake air pipe
5. Nut
6. Oil pump pulley
7. Pipes
8. Bolt
9. Starter
10. Bolt
Removal Note
Oil pump (2WS Diesel engine)
1. Hold the oil pump pulley with the SST, and remove
the pulley nut.
2. Slide the pulley forward. Remove the hose, pipes,
and the pump. 3. Remove the pulley.
76G10X-018
10—86

ELECTRICAL COMPONENTS OF ELECTRONICALLY-CONTROLLED POWER STEERING (ECPS) 1 0
Diagnosis Table
Condition Output pattern Malfunction Flow chart
No.
4.4V
0V-
10 seconds Power steering sole-noid valve or wiring harness (Control unit to Solenoid valve)
P/S—1
Refer to page
10-91
4.4V
0V-
Wiring harness (Con-
trol unit to Ignition coil) P/S—2 Refer to page 10-91
Steering wheel in straight-ahead po-sition with engine idling.
4.4V
OV-
Steering wheel angle sensor or wiring har-ness (Control unit to Angle sensor)
P/S—3 Refer to page 10-92
4.4V
ov-
Normal operation
Wiring harness (Fuse box to Control unit or Control unit to Body ground)
P/S—5 Refer to page 10—93
OV
10 seconds Power steering sole-
noid valve or wiring
harness (Control unit
to Solenoid valve)
P/S—1 Refer to page 10—91
B Steering wheel turned 45° left and right from center with engine idling
4.4V
0V
Wiring harness (Con-
trol unit to Ignition coil)
P/S—2 Refer to page 10-91
4.4V
0V'
Normal operation
4.4V
0V-
Steering wheel angle
sensor or wiring har-
ness (Control unit to
Angle sensor)
P/S—3 Refer to page 10—92
76G10X-023
10-89

1 0 ELECTRICAL COMPONENTS OF ELECTRONICALLY-CONTROLLED POWER STEERING (ECPS)
Condition Output pattern Malfunction Flow chart No.
B Cont'd
OV
Wiring harness (Fuse
box to Control unit or
Control unit to Body
ground)
P/S—5 Refer to page 10-93
C
Front wheels driv-en at more than 10 km/h (6.2 mph)
4.4V —
1 3 s econds Power steering sole-noid valve or wiring harness (Control unit to Solenoid valve)
P/S—1 Refer to page 10-91
C
Front wheels driv-en at more than 10 km/h (6.2 mph)
uv
Power steering sole-noid valve or wiring harness (Control unit to Solenoid valve)
P/S—1 Refer to page 10-91
C
Front wheels driv-en at more than 10 km/h (6.2 mph)
4.4V
n\i
—
Wiring harness (Con-trol unit to Ignition coil) P/S—2 Refer to page 10-91
C
Front wheels driv-en at more than 10 km/h (6.2 mph)
Wiring harness (Con-trol unit to Ignition coil) P/S—2 Refer to page 10-91
C
Front wheels driv-en at more than 10 km/h (6.2 mph)
4.4V
Steering wheel angle sensor or wiring har-ness (Control unit to Angle sensor)
P/S-3 Refer to page 10—92
C
Front wheels driv-en at more than 10 km/h (6.2 mph)

V
Steering wheel angle sensor or wiring har-ness (Control unit to Angle sensor)
P/S-3 Refer to page 10—92
C
Front wheels driv-en at more than 10 km/h (6.2 mph)
4.4V
Vehicle speed sensor or wiring harness
(Control unit to Meter)
P/S—4 Refer to page 10-92
C
Front wheels driv-en at more than 10 km/h (6.2 mph)
uv
Vehicle speed sensor or wiring harness
(Control unit to Meter)
P/S—4 Refer to page 10-92
C
Front wheels driv-en at more than 10 km/h (6.2 mph)
4.4V
OV —
Normal operation —
C
Front wheels driv-en at more than 10 km/h (6.2 mph)
OV
Wiring harness (Fuse box to Control unit or Control unit to Body ground)
P/S—5 Refer to page 10-93
76G10X-024
10-90

ELECTRICAL COMPONENTS
OF
ELECTRONICALLY-CONTROLLED POWER STEERING (ECPS) 1 0
Flow Chart
P/S—1
Failure of solenoid valve or wiring harness (Control unit to Solenoid valve)
Disconnect control unit connector. Check resistance between terminals.
Check voltage between (YL) and D (B) terminal of
control unit connector with engine running
OK
Terminal Resistance
M(LB)—N(LG) 3.5 — 7Q
Check control unit connector, solenoid valve connec-tor, and joint connector for connection, and check output pattern again.
NG
Check the solenoid valve (Refer to page 10—93),
NG
Replace solenoid valve.
P/S-Z Broken wiring harness
(Control unit to Coil)
Terminate of control unit connector with engine running.
NG
Replace control unit.
OK Repair wiring harness (Control unit to Solenoid valve).
Terminal Voltage
L(YL)-D(B) Approx. 12V
NG Repair the wiring harness (Control unit to Ignition
coil).
OK
Replace control unit.
76G10X-025
10—91

ELECTRICAL COMPONENTS OF 4-WHEEL STEERING 1 0
Warning light output pattern Malfunction Flow chart No.
ON
ncc
Stepper motor or wiring harness 4WS—6 Stepper motor or wiring harness 4WS—6
ON
r\cc
Oil leakage or oil
level switch
4WS—7 Oil leakage or oil
level switch
4WS—7
ON
OFF
Control unit 4WS—8 Control unit 4WS—8
ON
ncc
Control unit, alter-nator, or wiring harness
4WS—9
ON
ncc
Control unit, alter-nator, or wiring harness
4WS—9 Control unit, alter-nator, or wiring harness
4WS—9
86U10X-226
10—97

ELECTRICAL COMPONENTS OF 4-WHEEL STEERING 1 0
SPEED SENSOR (IN METER)
1. Jack up the front of the vehicle.
2. Connect a voltmeter between 2A (GR) terminal of
the control unit connector and a body ground.
3. Start the engine. Check that periodic voltage is de-
tected when turning'the front wheels slowly.
4. If periodic voltage is not detected, check the wir-
ing harness. Replace the speed sensor if
necessary.
86U10X-233
SPEED SENSOR (AT TRANSAXLE)
1. Jack up the front of the vehicle.
2. Connect a voltmeter between R (O) terminal of the
control unit connector and a body ground.
3. Start the engine. Check that periodic voltage is de-
tected when turning the front wheels slowly.
4. If periodic voltage is not detected, check the wir-
ing harness. Replace the speed sensor if
necessary.
86U10X-234
REAR-TO-FRONT STEERING RATIO SENSOR
Check the resistance between the terminals with an
ohmmeter.
Terminal [ Resistance
GB—GO l 3.5—6.5 kfi
GB—GW ' 3.2—5.9 kfi

If
the resistance is not within specification, replace the
rear steering gear assembly.
86U10X-235
OIL LEVEL SWITCH (IN P/S RESERVOIR)
Check for continuity of the switch with an ohmmeter.
Fluid level Continuity
More than L No
Less than L Yes

If
the continuity is not within specification, replace the
P/S reservoir.
86U10X-236
10—103