1987 MAZDA 626 engine

1 1 ANTI-LOCK BRAKE SYSTEM (ABS)
HYDRAULIC UNIT FLUID
Inspection of Level
1. Run the engine for 10 seconds to let the pump mo-
tor build pressure in the accumulator; then stop the
engine.
2. Check that the fluid level is between the Max and
Min lines of the reservoir.
3. If the level is lower than the Min line and leakage
from cap is not found, replace the hydraulic unit
assembly.
86U11X-187
76G11X-061
Replacement
1. Remove the reservoir cap and retainer.
2. Use a suction pump and a soft vinyl hose to suck
fluid from the reservoir.
Caution
a) A hard hose may damage the filter in the
reservoir.
b)Only the amount of fluid shown can be re-
moved from the reservoir.
3. Fill the reservoir with the specified type and amount
of brake fluid.
Caution
a) Do not allow any foreign material to enter
the reservoir.
b) Do not soak the upper filter with brake flu-
id. Otherwise, pouring fluid may be difficult.
Fluid: DOT-3 or DOT-4 or SAE J1703
4. Check the fluid level as described above.
HYDRAULIC UNIT
Warning
The accumulator contains high-pressure gas;
do not attempt to disassemble it or subject it
to hard shocks or high heat.
When the hydraulic unit is scrapped, the high-
pressure gas must be released. Turn the
screw on the accumulator bottom one full turn
only and allow the gas to escape gradually.
76G11X-097
11—94

ANTI-LOCK BRAKE SYSTEM (ABS) 1 1
86U11X-190
86U11X-191
76G11X098
Inspection of Pressure Reduction
1. Check that the battery is fully charged.
2. Jack up the vehicle and support it with safety
stands.
3. Release the parking brake.
4. Check the wheel for brake drag while turning it by
hand.
5. Connect terminal wires (GB) and (B) of the check
connector with a jumper wire.
6. Have an assistant depress the brake pedal; then
verify that the wheel cannot be turned.
7. Run the engine for 10 sec, and stop it.
8. With the brake pedal depressed, turn the ignition
switch ON.
9. With the brake pedal still depressed, check that the
wheel can be turned intermittently (when pressure-
reduction is operating).
Right'F Left F Rear Pressure reduction
Ignition switch ON OFF
1 05 1 sec sec sec
J
10. Check operation at the remaining wheels.
11. If not operated correctly, check the warning light
and brake light switch circuit for proper operation.
Inspection of Proportioning Valve
Note
The proportioning valve is built into the hy-
draulic unit.
1. Disconnect the flexible hose from the brake pipe;
then connect one pressure gauge to the front brake
pipe, the other to the rear brake pipe.
Note
Use a pressure gauge [9,810 kPa (100 kg/cm2,
1,422 psi)].
86U11X-193
11—95

1 1 ANTI-LOCK BRAKE SYSTEM (ABS)
t
2. Bleed air from the system.
3. Depress the brake pedal, and compare the fluid
pressure of the front brake with that of the rear
brake.
Fluid pressure kPa (kg/cm2, psi)

Front brake side Rear brake side
A 2,943 (30,427)
A'
2,747-3,139
(28-32, 398-455)

A B
B 6,867 (70,995)
B'
3,924-4,316 (40-44, 569-626)

Front brake pressure kPa (kg/cm2, psi) 4. If the measurement is not within specification re-
place the hydraulic unit assembly. 86U11X-194
REMOVAL
Caution
a) Brake fluid will damage painted surfaces. If it does get on the painted surfaces, wipe
it off immediately.
b) Oo not tip the hydraulic unit to prevent the brake fluid in the reservoir from draining.
1. Remove the nuts mounting the fuel filter and ignitor to the bracket and move them toward the engine.
2. Remove the air cleaner assembly.
3. Remove the master cylinder. (Refer to page 11—14.)
4. Remove the hydraulic unit in the sequence shown in the figure.
76G11X-062
11—96

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

OUTLINE 13
Front Coil Springs
Transa-
xle
Sun-
roof
Identification color
Model Market Engine Transa-
xle
Sun-
roof AAS ABS Green Light
green Pink Brown Purple Gray Orange
Sedan ECE F8 M4 — — — O
M5 — — — 0
4HAT — — — O
FE M5 — — — O
0 — — O
— o — o
o o — o
4HAT -— — o
— o — O
— — — o
o — — o
FE (DOHC) M5 — — — o
— o — 0
— o o o
— — o o
0 — — o
o o — o
0 0 o o
o — 0 o
FE (Fuel M5 — — — o
Injection) — 0 — O
EC-AT O — — o
o o — o
RF-N M5 — — — 0
RF-CX — — — o
Left Hand F8 M5 — — — o
Drive „ o — o
4HAT — — — o
RF-N M5 — — — o
Middle East FE M5 — — — o
-o — o
4HAT — — — o
— o — 0
Right Hand F6 3AT — — — 0
Drive M5 — — — o
FE M5 — — — 0
— o _ o
4HAT — — — o
— 0 — o
FE (DOHC) M5 — — — o
— o o 0
RF-N M5 — — — o
F8 M5 — — — 0
4HAT — — — o
76G13X003
O Available M4, M5.... ...Manual transaxle
— Not available EC-AT ....Electronically controlled automatic transaxle 4HAT ....Hydrallic controlled automatic transaxle
4WS ... 4-Wheel steering
AAS ....Auto adjusting suspention ABS ....Anti-lock brake system
3AT ... Automatic transaxle
13—5

13
OUTLINE
Transa-
xle Sun-

roof
Identification color
Model Market Engine Transa-
xle Sun-

roof
AAS ABS
Green Light
green Pink Brown Purple Gray Orange
Hatchback
ECE F8 M4 — — — O
M5 — — — O

4HAT
— — — O
FE M5 — — — o
O — — o

4HAT
-— — o
o — — O
FE
(DOHC)
M5 — — — o
— o — O
— o 0 o
— — 0 o
o — — o
o o — o
o o o 0
o — 0 o
— — 0 O (4WS)
o — 0 o
(4WS)

Left Hand
F8 M5 — — o
Drive 4HAT
— — — o
FE M5 — — — 0
— o — o

Middle East
FE M5 — — — o
— o — o

4HAT
— — — 0
-o — 0

Right Hand
F8 M5 — — — o
Drive 4HAT
— — o
FE M5 — — — o
— o — o

4HAT
— — — o
— o — o
FE
(DOHC)
M5 — — — o
— o — o
— o o

76G13X-004

13—6

OUTLINE
13

Transa-
xle Sun-

roof
Identification color
Model Market Engine Transa-
xle Sun-

roof
AAS ABS
Green Light
green Pink Brown Purple Gray Orange
Coupe/MX-6
ECE FE M5 — — — 0
O — — O

4HAT
— — — O
o — — 0
FE
(DOHC)
M5 — — — O
— o — o
— o o o
— — o o
o — — o
o o — o
o o o o
o — o o

Left Hand
FE M5 — — — O
Drive
— o — O
F8 M5 — — — o

Middle East
FE M5 o — — O
— o — o

Right Hard
F8 M5 — — — o
Drive
FE M5 — — — o
— o — o

4HAT
— — — o
— o — o
FE
(DOHC)
M5 — — — o
— o — o
— o o o

76G13X-005

13—7

13 OUTLINE
Rear Coil Springs
Transa-xle
Sun-
roof
Identification color
Model Market Engine Transa-xle
Sun-
roof AAS ABS Orange White Yellow Brown Blue Green Red Pink
Sedan ECE F8 M4 — — — R L
M5 — — — R L
4HAT — — R L
FE M5 — — — R L
— — R L
— o — R L
O 0 — R L
4HAT — „ — R L
— 0 — R L
— — — R L
o — — R L
FE (DOHC) M5 — — — R L
— o — R L
— o 0 R L
— — o R L
0 — — R L
0 o — R L
o 0 0 R L
o — o R L
FE (Fuel M5 — — — R L
Injection) — o — R L
EC-AT o — — R L
o o — R L
RF-N M5 — — — R R L L
RF-CX _ — — R L
Left Hand F8 M5 — — — R L
Drive — o — R L
4HAT — — — R L
RF-N M5 — — — R L
Middle East FE M5 — — — R L
— o — n L
4HAT — — — R L
— o — L
Right Hand F6 3AT — — — L R
Drive M5 — — — L R
FE M5 — — — L
— o — L R
4HAT — — — L
— o — L R
FE (DOHC) M5 — — — L R — o o L R
RF-N M5 — — L R
F8 M5 — — — L R
4HAT — — — L R
76G13X-006
0 Available R Right side M4, M5 Manual transaxle 3AT Automatic transaxle — Not available L Left side EC-AT... Electronically controlled automatic transaxle 4HAT..., Hydrallic controlled automatic transaxle 4WS...... 4-wheef steering AAS Auto adjusting suspention ABS Anti-lock brake system
13-8