1987 MAZDA 626 wiring

1 1 ANTI-LOCK BRAKE SYSTEM (ABS)
Troubleshooting Main Flow Chart
Check that the ABS warning light operates.

• Turn ignition switch OFF
to
ON, and check that ABS warning light illuminates constantly.

Flashing (Past failure)
OK
Check the ABS for failure.
• Start engine, and observe flashing
of
warning light.
Does not
illuminate
constantly
Warning light Possible cause
Does
not il-

luminate
at all

Refer
to
page 11—86.

ON
Alternator
L
ter-minal output Wiring harness (ALT-control unit) Control unit

OFF
1 sec

Alternator
L
ter-minal output Wiring harness (ALT-control unit) Control unit

ON
Relay box wiring harness (warning light-control unit) Control unit

OFF
1 sec

Relay box wiring harness (warning light-control unit) Control unit

No illumination
(Not diagnosed)
Illuminates constantly
(Present failure)
ABS is usually operating cor-rectly.
Consult table below when ABS failure
is
still suspected.
System Possible cause
ABS Brake light switch
Both rear wheel speed sensors
Control unit Proportioning
valve
in hy-
draulic unit
Other than Refer
to

ABS troubleshoot-ing guide
on

page 11—5.

Repair failures with flow
chart. (Refer to page
11—76.)
76G11X-054
11-74

ANTI-LOCK BRAKE SYSTEM (ABS) 1 1
Diagnosis Table
Note
Flashing of the warning light shows past failure, and its illumination shows present failure.
Diagnosis indication Possible failure Flow chart
No. Warning light Voltmeter Possible failure Flow chart
No.
ON
n
i2vn
OV

Hydraulic unit Harness
Right front wheel speed
sensor ABS-1
ON
n nn
Hydraulic unit Harness Left front wheel speed sensor ABS-2

OFF

Hydraulic unit Harness Left front wheel speed sensor ABS-2

OFF
nnn

Hydraulic unit Harness
Rear wheel speed sensor ABS-3

n
nnnn
Right front sensor rotor ABS-4

n
nnnnn
Left front sensor rotor ABS-5

JLilTUITLTL
Right rear sensor rotor ABS-6

jirLruiJum
Left rear sensor rotor ABS-7

J n
Hydraulic unit Harness
Control unit connector (11-pin)
ABS-8

nnnn

Hydraulic unit Harness
Control unit connector (11-pin)
ABS-8

J nn

Relay box
Hydraulic unit
Harness
ABS-9

jumruiTL

Relay box
Hydraulic unit
Harness
ABS-10

j nnn
Relay box
Hydraulic unit
Harness
ABS-11

jinnjuuL

Relay box
Hydraulic unit
Harness ABS-12

j nnnn

Relay box
Hydraulic unit
Harness
ABS-13

jiruuirirL

Relay box
Hydraulic unit
Harness
ABS-14

j nnnnn
Hydraulic unit Harness Control unit
ABS-15

juuuiruL

Hydraulic unit Harness Control unit ABS-16

j JinjiruifL.
Control unit
ABS-17

jiruinjiri—
JinjiruifL.
Control unit
ABS-18

j
No signal; failure condi-tions not stored
in
memory
Control unit Control unit connector (17-pin) Battery capacity Alternator output voltage Wiring harness (warning light-control unit-check connector)
Inspect, and repair or replace as necessary
j
No signal; failure condi-tions not stored
in
memory
No problem When warning light does
not
illuminate with engine running and
no
jumper wire

76G11X092
11-75

1 1 ANTI-LOCK BRAKE SYSTEM (ABS)
Flow Chart (Refer to Wiring Diagram, Page 11—72.)
ABS-1
Possible failure
Right front wheel speed sensor, Harness, Hydraulic unit
Disconnect Q-01 (11-pin) connec-tor. Check continuity
at
harness side.
Q-01 (11-pin)
I
Continuity
Y (2C) Ground No

OK

Measure resistance
at
harness side.
Q-01 (11-pin) Resistance
Y (2C)
i 0
(2D) 800—1200
Q
OK
NG
Repair harness.

(Control unit — Right front sensor)
NG

Disconnect Q-03. Measure resistance
at
sensor.
Q-03 Resistance
Y
[ O
800—1200 Q

NG
Replace right front wheel speed sensor.

OK
Repair harness.

(Control unit — Right front sensor)

Check followings*
• Clearance between sensor and rotor standard: 0.3—1.1
mm
(0.012-0.043
in)
• Objects sticking
to
sensor
or
rotor
• Damaged sensor
or
rotor
• Sensor installation Tightening torque: 16-23 N-m (1.6-2.3 m-kg, 12—17 ft-lb)

OK

Connect Q-01 (11-pin) connector. Jump GB
to B at
Q-07 connector. Start engine. Check that warning light stays ON. Drive vehicle and check that warning light flashes (0.25 sec ON OFF)
at 15
km/h
(9
mph).

NG
Repair
or
replace
as
necessary
* All conditions can
be
verified
as
follows,
if an AC
voltmeter
is
available. 1. Jack
up
vehicle. 2. Measure sensor voltage while rotating right front wheel
one
revolution
per
second.
Q-01 (11-Din) Voltage (AC)
Y (2C) O (2D) More than 0.25V

NG
Check Q-01 connector,
or
Replace control unit.

OK

Replace hydraulic unit.

76G11X-055
11—76

REAR HATCH 1 4
8. Remove the opening rod.
9. Remove the rear hatch opener.
86U14X-027
10. Remove the retainer, and the key cylinder.
86U14X-028
11. Remove the stay damper mounting bolts.
12. Disconnect the rear washer hose.
13. Remove the wiring harness.
86U14X-029
14. Remove the rear hatch hinge to door mounting
bolts.
15. Remove the rear hatch.
86U14X-030
14—11

1 4 SLIDING SUNROOF
3. After moving the guide bracket assembly slightly
toward the rear, tighten the screw, taking care
regarding the direction the set plate faces.
76U14X-059
Ipi
" (E) ling
Notch jilting Cam
—+ * ) siii
Align the projection of the tilting cam and the slit
in the set plate.
76U14X-060
5. Check that the limit switches (LS1 and LS2) of the
motor are as shown in the figure at the OFF po-
sition.
Note
a) Be careful of the cam position.
b) Use the handle to position it correctly.
76U14X-061
6. Install the motor assembly.
Note
There are 2 types of screws, long and short.
Be sure to use the correct ones.
7. Connect the wiring of the motor assembly and the
motor switch.
76U14X-062
14-86

15 INTRODUCTION
INTRODUCTION
HOW TO USE THIS SECTION
Information regarding removal and installation of electrical equipment is given in SECTION 14.
Understanding will be easier if this section is used in conjunction with the WIRING DIAGRAMS.
63U15X-002
ELECTRICAL TROUBLESHOOTING TOOLS
Test Light
The test light, as shown in the figure, uses a 12V bulb.
The two leads should be connected to probes. The
test light is used for simple voltage checks and to
check for short circuits.
Caution
When checking the control unit, never use a
bulb over 3.4W.
69G15X-002
Jumper Wire
The jumper wire is used for testing by short-circuiting
switch terminals and to verify the condition of ground
connections.
Caution
Do not connect the jumper wire between a
power source line and body ground, because
doing so may cause burning or other damage
to harnesses or electronic components, etc.
61G15X-002
Voltmeter
The DC voltmeter is used for measurement of circuit
voltage. A voltmeter with a range of 15V or more is
used. It is used by connecting the positive (+) probe
(red lead) to the point where voltage is to be meas-
ured and connecting the negative (-) probe (black
lead) to the body ground.
69G15X-003
15—2

INTRODUCTION 15
63U15X-005
BrY
YELLOW
BLACK BROWN
47U15X-008
Ohmmeter
The ohmmeter is used to measure the resistance be-
tween two points in a circuit, and is also used to check
for continuity and diagnosis of short circuits.
Caution
Do not attempt to connect the ohmmeter to
any circuit to which voltage is applied, be-
cause doing so may burn or otherwise dam-
age the ohmmeter.
PRECAUTION
Wiring Color Code
Two-color wires are indicated by a 2-letter symbol.
The first letter indicates the base color of the wire and
the second indicates the color of the stripe.

CODE COLOR

B
BLACK

Br
BROWN

G
GREEN

L
BLUE

Lb
LIGHT BLUE

Lg
LIGHT GREEN

0
ORANGE

R RED

Y
YELLOW

w WHITE
Bulkhead-Type Connector
This connector can be separated by pressing the lock
lever.
Do not pull the wire when removing the connector;
be careful to hold the connector itself when discon-
necting.
69G15X004
15-3

INTRODUCTION 15
69G15X-006
4BG15X-003
69G15X-007
/Wire
Shield braid wire
Insulation
Replacement of Fuse
1. When replacing a fuse, be sure to replace it with
one of the specified capacity.
If, after a fuse has been replaced, it fails again, there
is probably a short in the circuit, and the wiring
should be checked.
2. Be sure the negative battery terminal is disconnect-
ed before replacing a main fuse.
3. When replacing a fuse, use the supplied fuse puller
in the fuse box cover.
Thin Insulation Wire
To reduce the weight of the wiring harness, a thin
coating of high resistance insulation material is used.
Shielded braid wire
This wire is used to prevent a malfunction in impor-
tant circuits that are susceptible to outside signals or
interference.
Eg.
Ignition coil
02 sensor
69G15X-008
15—5