1987 MAZDA 626 fuel

15 METER

Standard indication
(km/h)
Allowable range
(km/h)

40 40-
43

80 80-
84

120
120—126
Standard indication

(mph)

Allowable range

(mph)
30
30-32

50
50-53

80
80—84

86U15X-029

Standard Indication

(rpm)

Allowable range

(rpm)
1000
850—1090
2000 1910-2210
3000 2850-3330
4000 3820-4420
5000 4790—5510
6000 5760-6600

86U15X-030
INSPECTION OF ANALOG METER
Speedometer
1. Using a speedometer tester, check the speedom-
eter for allowable indication error, and check the
operation of the odometer. Replace if necessary.
2. Check the speedometer for fluctuation and/or ab-
normal noise.
Caution
a) If significant fluctuation occurs or the
speedometer does not move at all, remove
the speedometer cable. If normal, replace
the speedometer assembly.
b)Tire wear and improper inflation will in-
crease speedometer error.
Tachometer
1. Connect a test tachometer to the engine, and start
the engine.
2. Check the tachometer for allowable indicator er-
ror. Replace if necessary.
Caution
When removing or installing the tachometer,
be careful not to drop it.
Fuel Gauge
1. Disconnect the connector from the fuel tank unit.
86U15X-031
Connect the red lead of the SST to the terminal
"Y", and the black lead to a body ground.
86U15X-032
15-26

METER 15
86U15X-033
86U15X-034
104.1t! 21
2330 16.10
a £] U \JEMP j n
JJ
86U15X-035

Standard indication
(km/h)
Allowable range
(km/h)
60 60-63
Standard indication
(mph)
Allowable range
(mph)
60 60-63

86U15X-036
3. Set the SST to the resistance values shown in the
figure.
4. Turn the ignition switch ON, and check that the
needle indicator displays the correct values.
If the needle displays correctly, check the gauge
unit. If not, replace the fuel gauge in the meter or
repair the wiring harness.
Caution
a) Continue the above checks for at least two
minutes each to correctly judge the con-
dition.
b)The allowable indication error is twice the
width of the needle.
Water Temperature Gauge
1. Disconnect the connector from the water thermo
sensor.
2. Connect the red lead of the SST to the connec-
tor, and the black lead to a body ground.
3. Set the SST to the resistance values shown in the
figure.
4. Turn the ignition switch ON, and check that the
needle indicator displays the correct values.
If the needle displays the correct values, the trou-
ble is in the gauge unit; if not, the trouble is in the
meter or the wiring harness.
Caution
a) Continue the above checks for at least two
minutes each to correctly judge the con-
dition.
b)The allowable indication error is twice the
width of the needle.
INSPECTION OF DIGITAL METER
Speedometer
1. Using a speedometer tester, check the speedom-
eter for allowable indication error, and check the
operation of the odometer. Replace the meter as-
sembly if necessary.
2. Check the speedometer for fluctuation and/or ab-
normal noise.
Caution
a) If significant fluctuation occurs or the
speedometer does not move at all, remove
the speedometer cable. If normal, replace
the digital meter assembly.
b)Tire wear and improper inflation will in-
crease speedometer error.
15—27

15 METER

Standard Indication

(rpm)

Allowable range

(rpm)
1000
900—
950

2000 1900-1950
3000 2900—2950
4000 3900-3950
5000 4900—4950
6000 5900-5950

86U15X-037
86U15X-038
86U15X-039
Standard display Expanded display
E ©FUEL F E © FUEL F
"io — •
QJ1QOOODDOOOD
Tachometer
1. Connect a test tachometer to the engine, and start
the engine.
2. Check the tachometer for the allowable indicator
error. Replace digital meter assembly.
Caution
When removing or installing the tachometer,
be careful not to drop it or subject it to sharp
impact.
Fuel Gauge
1. Disconnect the connector from the fuel tank unit.
2. Connect the red lead of the SST to terminal "Y"
and the black lead to body ground.
86U15X-040
Set the SST to the resistance values shown the fol-
lowing table.
Turn the ignition switch ON and check that the seg-
ment displays the correct values in each range.
If the segment displays the correct values, check
the gauge unit. If not, replace the digital meter as-
sembly.
Caution
Continue the above inspections for at least
two minutes each to correctly judge the con-
dition.

Segment Standard display Expanded display Segment Resistance
(Q)
1-10
less than
8
less than
63

1-
9
8-14
63-66

1-
8
14—20 66-70

1-
7
20-25 70-74

1-
6
25-30 74-78

1-
5
30—37 78-82

1-
4
37-46 82-86

1—
3
46-63 86-90

1-
2
63-86 90-93

1
86-98 93-98

1
(flashing) more than
98
less than
98
15-28

METER 15
Water Temperature Gauge
1. Remove the connector from the water thermo
sensor.
2. Connect the red lead of the SST to the connec-
tor, and the black lead to a body ground.
86U15X-041
C -&TEMP H
r
•
|
7 •
V i y
86U15X-042
3. Set the SST to the resistance values shown in the
following table.
4. Turn the ignition switch ON and check that the seg-
ment displays the correct values. If the segment
displays the correct values, check the gauge unit.
If not, replace the digital meter assembly or repair
wiring harness.
Caution
Continue the above checks for at least two
minutes each to correctly judge the condition.

Segment Resistance
(Q)
Segment Resistance
(Q)
1-10
less than
17
1-5
33-89

1-
9
17—20
1-4
89-120

1—
8
20—26
1-3
120-145

1—
7
26-28
1-2
145-177

1-
6
28-33
1
more than
177
INSPECTION OF METER SENDER
Fuel tank unit (except 4WS model)
1. Disconnect the connector from the fuel tank unit.
2. Remove the fuel tank unit from the tank.
3. Connect an ohmmeter to terminal "b" of con-
nector.
4. Move the unit arm slowly from point (F) to point
(E), and read the resistance values. If not as speci-
fied, replace the unit.
86U15X-043
15—29

15 METER
Fuel transfer unit (only 4WS model)
1. Remove the fuel transfer unit referring to section 4.
2. Remove the connector from the fuel transfer unit.
3. Connect an ohmmeter between "b" and "d" ter-
minal of the connector.
4. Move the unit arm slowly from point (F) to point
(E), and read the resistance values.
5. If not as specified, replace the unit.
86U15X-044
iel tank unit (only 4WS model)
Remove the fuel tank unit.
Remove the connector from the fuel tank unit.
Connect an ohmmeter between "d" terminal of the
connector and fuel tank unit cover.
Move the unit arm slowly from point (F) to point
(E) and read the resistance values.
If not as specified, replace the unit.
86U15X-045
Water Thermo Sensor
1. Remove the sensor.
2. Place the sensor in water along with a ther-
mometer.
3. Heat the water gradually, and check the resistance
of the sensor with an ohmmeter.
4. If the resistance is not as specified, replace the
sensor.
Resistance: 49.3—57.7 Q at 80°C (176°F)
76G15X-089
15-30

1 5 WARNING LIGHT AND SENDER
76G15X-042
Low Fuel Level Warning Light
does not illuminate

Replace the fuel gauge unit

86U15X-060
86U15X-061
15-36

15 HEADLIGHT
HEADLIGHT
CIRCUIT DIAGRAM
TROUBLESHOOTING
Leaded Fuel Model
76G15X-055
15-54

HEADLIGHT 15
Unleaded fuel model
OK

Check
for
12V
at
"RB" wire (when low and/or "RW" wire (when high)
of
combination switch
6
pin con-nector

NG
Check
for
12V
at
"RB" wire (when low and/or "RW" wire (when high)
of
combination switch
6
pin con-nector

NG
Replace combination switch
Check
for
12V
at
"RB" wire (when low and/or "RW" wire (when high)
of
combination switch
6
pin con-nector

OK

Check the voltage between each terminal
of
the headlihgt relay and
a
body ground.
Terminal Voltage
a (RW) 12V
c(R) 12V
NQ Repair harness
(a
terminal
—
combination switch
to
headlight relay,
c
terminal
—
main fuse
to
headlight relay)

OK
OK —
Replace the bulb(s)

76G15X-053
INSPECTION
Headlight Relay
Check for continuity between terminals of the relay.

Connecting
to
Terminal
12V Ground a b c d

— —
O— —O
a b O— —-O
O—O: indicates continuity

76G15X-054
15—55