1987 MAZDA 626 Workshop Manual

ANTI-LOCK BRAKE SYSTEM (ABS) 1 1
86U11X-196
1. Coupler
2. Brake pipe (from master cylinder)
3. Brake pipe (to front brakes)
4. Brake pipe (to rear brakes)
5. Mount bushing
6. Hydraulic unit
11—97

1 1 ANTI-LOCK BRAKE SYSTEM (ABS)
INSTALLATION
1. Install in the reverse order of removal.
Before installing the air cleaner assembly, igniter, and fuel filter:
(1) Add brake fluid and bleed air. (Refer to page 11—9.)
(2) Check each part for fluid leakage.
(3) Check the brake fluid level of both the master cylinder reservoir and hydraulic unit reservoir.
2. Tighten all bolts and nuts to the specified torque, referring to torque specifications.
3. After installation:
(1) The sealing reservoir cap (red) is installed on the new hydraulic unit to prevent the brake fluid
from leaking while shipping. Replace it with an original cap (black) after replacing the hydraulic unit.
(2) Check that the hydraulic unit operates properly by testing the pressure reduction. (Refer to page
11-95.)
Torque specifications
11-98

ANTI-LOCK BRAKE SYSTEM (ABS) 1 1
CONTROL UNIT CIRCUIT
Inspection of Control Unit Circuit
1. Start the engine, and run it for 10 seconds.
2. Disconnect the connectors from the control unit. Check the connector at the harness side as shown
in the table below.
Terminal Connection or measured item Check item Tester connection Condition Voltage or
resistance

Q-01 11 -pins
2A (W),
2B (R)
Wheel speed sensor
Left front Voltage (AC) 2A (W)
- 2B
(R) Turn wheel
1
revolution
per second More than 0.25V (AC)
Q-01 11 -pins
2A (W),
2B (R)
Wheel speed sensor
Left front
Resistance
2A (W)
- 2B
(R)

—
800-1.2000
Q-01 11 -pins
2C (Y),
2D
(0)
Wheel speed sensor
Right front Voltage (AC) 2C (Y)
-
2D (0) Turn wheel
1
revolution
per second More than 0.25V (AC)
Q-01 11 -pins
2C (Y),
2D
(0)
Wheel speed sensor
Right front
Resistance
2C (Y)
-
2D (0)

—
800-1,2000
Q-01 11 -pins 2E (YG),
2F (YL)
Wheel speed sensor
Left rear Voltage (AC) 2E (YG)
- 2F
(YL) Turn wheel
1
revolution
per second More than 0.25V (AC) Q-01 11 -pins 2E (YG),
2F (YL)
Wheel speed sensor
Left rear
Resistance
2E (YG)
- 2F
(YL)

—
800-1,200G
Q-01 11 -pins
2H (G).
2J
(L)

Wheel speed sensor
Right rear Voltage (AC) 2H (G)
- 2J
(GR)
Turn wheel
1
revolution
per second More than 0.25V (AC)
Q-01 11 -pins
2H (G).
2J
(L)

Wheel speed sensor
Right rear
Resistance
2H (G)
- 2J
(GR)

_
800-1,200fl
Q-01 11 -pins
21 (GR) Low pressure switch Continuity 21 (GR)
-
Ground
—
Continuity
Q-01 11 -pins
2K (LB) High pressure switch Continuity 2K (LB)
-
Ground
—
Continuity
Q-01 11 -pins
2L (WB) Alternator output Voltage 2L (WB)
-
Ground Run engine Approx.
14V

Q-01
17-pins
A (WG) Brake light switch Voltage A (WG)
-
Ground Depress brake pedal 12V
Q-01
17-pins
B (RY) Motor Continuity B (RY)
—
Ground
—
Continuity
Q-01
17-pins
C (LO) Motor relay Resistance C (Lo)(© test-lead)-J
—
Approx. 60—700
Q-01
17-pins
D (GR) Check connector Continuity D (GR)
- A
(GR, Q-07)
—
Continuity
Q-01
17-pins
E (BL) Fail-safe relay Resistance E (BL)
- G
(BG)
—
Approx. 70-800
Q-01
17-pins
F (LY) Warning light Continuity F (LY)
-
Ground
—
Continuitv Q-01
17-pins G (BG) Battery Voltage G (BG)
—
Ground Turn ianition
SW ON
12V Q-01
17-pins H (GB) Check connector Continuitv H (GB)
- B
(GB. Q-07)
—
Continuitv
Q-01
17-pins
J (YG) Solenoid valve
Resistance
JfYG)
- K
(Br)

-
Approx.
5.5—7.00
Q-01
17-pins
K (Br) Solenoid valve
Resistance
JfYG)
- K
(Br)

-
Approx.
5.5—7.00
Q-01
17-pins
M (YR) Solenoid valve Resistance M (YR)
- 0
(BW)
-
Approx.
5.5—7.00
Q-01
17-pins
0 (BW) Solenoid valve Resistance M (YR)
- 0
(BW)
-
Approx.
5.5—7.00
Q-01
17-pins
Q (YW) Solenoid valve
Resistance
Q (YW)
- R
(L)

-
Approx.
5.5—7.00
Q-01
17-pins
R (L) Solenoid valve
Resistance
Q (YW)
- R
(L)

-
Approx.
5.5—7.00
Q-01
17-pins
L (B)
Ground circuit Continuity
L (B)
—
Ground
Continuity
Q-01
17-pins
N
(B)
Ground circuit Continuity N (B)
—
Ground Continuity
Q-01
17-pins
P (B)
Ground circuit Continuity
P (B)
—
Ground
C (B.Q-07)
-
Ground
Continuity
4-pins C(B)
Ground circuit Continuity
P (B)
—
Ground
C (B.Q-07)
-
Ground
Continuity

Control Unit Connector View from harness side
Q-01 (11-pin)

LB
GR YG Y W
>1 ,1 U;.l Ki -X
1 L G VL rf
Q-01 (17-pin)
Q-01 ABS Control Unit [R]
YW BW YR Br 8G BL LO WG
icL olL
MIL
ICL G(=L tl ij^" llyl
>1
CjJ
Lt|J JCjJ fiC|3 H«|3
L B B B ffi SB L* GS RY
Check connector (4-pin)
Q-07 Check Connector [RJ
B GR
LY GB
86U11X-199
11—99

12
WHEELS AND TIRES
OUTLINE 12— 2
SPECIFICATIONS 12— 2
TROUBLESHOOTING GUIDE 12— 2
WHEELS AND TIRES 12—3
INSPECTION AND ADJUSTMENT 12— 3
TIRE ROTATION 12—4
WHEEL BALANCE 12— 5
WHEEL MOUNTING 12— 5
SPECIAL NOTE 12—5
86U12X-001

1 2 OUTLINE, TROUBLESHOOTING GUIDE
OUTLINE
SPECIFICATIONS
Type
Item Standard Temporary spare (if equipped)

Wheel
Size
5-J
x 13

4-T
x 15

Wheel
Size 5 1/2-JJ
x 14
4-T
x 15

Wheel
Size
6-JJ
x 15

4-T
x 15

Wheel
Off set mm (in) 42 (1.65) 53 (2.09)
Wheel Diameter
of
pitch circle
mm
(in) 114.3 (4.5) Wheel
Material Steel
or
aluminum alloy Steel
Wheel
Number
of
fixing nuts
13 inch-wheel 4
4
or 5

Wheel
Number
of
fixing nuts 14 inch-wheel 5 4
or 5

Wheel
Number
of
fixing nuts 15 inch-wheel 5 4
or 5

Tire
Size
13 inch-wheel
6.45—13—6PR
165 SR13 165/80R13 82S 185/70HR13 185/70R13 85H
T125/70D15
Tire
Size 14 inch-wheel
185/70HR14 185/70R14 87H 185/70R14 88H 185/70VR14
T125/70D15
Tire
Size
15 inch-wheel 195/60R15 86H
195/60VR15
T125/70D15
Tire
Air pressure
kPa (kg/cm2,
psi)
Front 216 (2.2, 31) or 196 (2.0, 28) "See tire labels for application 412(4.2, 60)
Tire
Air pressure
kPa (kg/cm2,
psi) Rear 177 (1.8, 26)
412(4.2, 60)

TROUBLESHOOTING GUIDE 76G12X-001
Problem Possible Cause Remedy Page
Premature tire wear

Incorrect tire pressure Adjust 12-
2
Tire squeal
Incorrect tire pressure Tire deterioration
Adjust ReDlace
12-
2
Road noise or body vibration
Insufficient tire pressure Unbalanced wheel(s) Deformed wheel(s)
or
tire(s) Irregular tire wear
Adjust Adjust Repair
or
replace Reolace
-1

12-
2
12-
5
Steering wheel vibration
Irregular tire wear Right and left tread depths different Deformed
or
unbalanced wheel(s) Deformed tire(s) Unequal tire pressures Loose lug nuts
Replace Replace
Replace
or
adjust Replace Adjust Tiahten
12-
5

12—
2
12-
5
Uneven (one-sided) braking
Unequal tire pressures Adjust 12-
2
Steering wheel doesn't return properly, or pulls to either left or right while vehicle moving on level road surface

Incorrect tire pressure Irregular tire wear (left and right are different) Unequal tire pressures Different types
or
brands
of
tires mixed (right/left) Improperly tightened lug nuts
Adjust Replace Adjust Replace Tighten
12-
2

12—
2

12-
5
General driving in-stability

Unequal tire pressures Deformed
or
unbalanced wheel(s) Loose lug nuts
Adjust Replace
or
adjust Tiahten
12-
2
12-
5
12-
5
Excessive steering wheel play
Loose lug nuts Tighten 12-
5
76G12X-002
12-2