1987 MAZDA 626 Workshop Manual

15 HEATER
Circuit Diagram
15—122

HEATER 15
LOGICON SWITCH
Inspection
b d f h
I? c V Note
a) Remove the logicon switch from the vehicle.
b) Supply 12V as shown in the figure.
c) Check each circuit.
B
lA
DiF H J LjN pIr T V B
lA c|e G I XIM 0|Q S w
86U15X-207
Checking REC-FRESH Air Selector Circuit
1. Connect a jumper wire between M terminal and
L terminal.
Connect a resistance (at least
1
kfi) between
B
ter-
minal and 0 terminal, and check the voltage be-
tween these terminals using a voltmeter.
Terminals Voltage
B - 0 Approx. 12V
86U15X-208
d I
J X J

~Sfr
_ „ — —
2. Connect a resistance (at least
1
kS2) between d ter-
minal and B terminal, and check the voltage be-
tween d terminal and 0 terminal using a voltmeter.
\ . X ) 0
Terminals Voltage
B - 0 Less than 1V
Voltmeter
86U15X-209
15—123

15 HEATER
86U15X-210
86U15X-211
86U15X-212
3. Check for continuity between N terminal and L ter-
minal with the REC-FRESH selector switch in
FRESH position (out) using an ohmmeter.
4. Check for continuity between P terminal and L ter-
minal with the REC-FRESH air selector switch in
REC position (in) using ohmmeter.
Checking Mode Control Circuit
1. Connect a jumper wire between I terminal and L
terminal,
Connect a resistance (at least 1 kQ) between D ter-
minal and L terminal, and check the voltage be-
tween these terminals using a voltmeter.

Terminals Voltage

D
- L
Approx.
12V
2. Connect a jumper wire between C terminal and L
terminal.
Connect a resistance (at least 1 kfi) between A ter-
minal and L terminal, and check the voltage be-
tween these terminals using a voltmeter.

Terminals Voltage

A
— L
Approx.
12V
86U15X-213
15—124

HEATER 15

Effl
k /
Voltmeter
86U15X-214
d I
k J X
S3
Voltmeter
86U15X-215
[ I H
k J X /
xj;
iD5F]H|j
ll iE;G Ll.i.i..
Ohmmeter
86U15X-216
d C
•W
©
i IL i
X / X
Qi ! i
+
u
Voltmeter
3. Connect a resistance (at least 1 kfi) between d ter-
minal and D terminal, and check the voltage be-
tween D terminal and L terminal using a voltmeter.

Terminals Voltage
D
- L
Less than
1V
4. Connect a resistance (at least 1 kfl) between d ter-
minal and A terminal, and check the voltage be-
tween A terminal and L terminal using a voltmeter.
Terminal Voltage
A - L Less than 1V
5. Check for continuity between each terminal with
following condition using an ohmmeter.

Condition Terminals Continuity
Push the VENT switch J
- L
Yes
Push the B/L switch G
- L
Yes
Push the HEAT switch H
— L
Yes
Push the H/D switch E
- L
Yes
Push the DEF switch F
- L
Yes

Checking Air Mix Control Circuit
1. Connect a resistance (at least 1 kfl) between Q ter-
minal and T terminal.
Set temperature control lever to center position be-
tween MAX HOT and MAX COLD.
Connect a jumper wire between V terminal and U
terminal, and check the voltage between each ter-
minals.

Terminals Voltage
T
- L
Approx.
12V

Q
- L
Less than
1V
86U15X-217
15—125

15 HEATER
86U15X-218
86U15X-219
86U15X-220
r.". 1
T 1 11 1.11 -4
y -L -v* X /
1
C I y
1 A +
Voltmeter
2. Connect a resistance (at least 1 kfi) between Q ter-
minal and T terminal.
Set temperature control lever to center position be-
tween MAX HOT and MAX COLD. Connect a jum-
per wire between V terminal and S terminal, and
check the voltage between each terminal using a
voltmeter.
Terminals Voltage
Q - L Approx. 12V
T - L Less than 1V
3. Connect a resistance (at least 1 kfi) between Q ter-
minal and T terminal.
Set temperature control lever to MAX HOT, and
check that Q terminal voltage is higher than termi-
nal t voltage.
4. Connect a resistance (at least 1 M2) between Q ter-
minal and terminal t.
Set temperature control lever to MAX COLD, and
check that T terminal voltage is higher than Q ter-
minal voltage.
Checking A/C Switch and ECO Switch Circuit
1. Turn the A/C switch off.
Connect a jumper wire between terminal c and ter-
minal L.
Connect a resistance (at least 1 kQ) between each
terminals, and check the voltage between these
terminals.
Terminals Voltage
d-g OV
d - f OV
d - h OV
86U15X-221
15-126

HEATER 15
f! !"H

a

+
1 d-V' X /
S3
Voltmeter
86U15X-222
2. Turn the A/C switch on.
Connect a resistance (at least 1 kQ) between each
terminal, and check the voltage between these ter-
minals.

Terminals Voltage
d-g OV
d
- f
OV
d
- h
OV

d I—T-
fjrh
X }
®(dxr
X /
86U15X-223
d fi riTu~"! 1 L r-
k J M > < / —IC
7 T — 101 [oOrv
86U15X-224
X
86U15X-225
3. Turn the A/C switch on and the ECO switch off.
Connect a jumper wire between terminal c and L
terminal.
Connect a resistance (at least 1 kQ) between each
terminals, and check the voltage between these
terminals.

Terminals Voltage
d-g OV
d
- f
Approx.
12V

d
- h
Approx.
12V
4. Turn the A/C switch and the ECO switch on.
Connect a jumper wire between terminal c and L
terminal.
Connect a resistance (at least 1 kQ) between each
terminal, and check the voltage between these ter-
minals.

Terminals Voltage
d-g Approx.
12V

d
- f
OV
d
- h
Approx.
12V
Checking Fan Speed Control Lever
Check for continuity between each terminal of 6 pin
connector.

Fan switch condition
® ® © @ © ©

OFF
1
2 O--O
3 O--O O— -O
4 O--O O--O

o
-O: indicates continuity

15-127

15 HEATER
i l< i |l
k J X / X X L<
1 +
L<
1 + 1
Checking Dim Indicator Circuits
(Indicator circuit)
1. Connect a jumper wire-between terminal c and ter-
minal L.
Check for illumination at A/C switch indicator with
A/C switch on.
Check for illumination at ECO switch indicator with
ECO switch on.
86U15X-226
d 1 |L
k J X / I k
1 Jl +
2. Check that the mode control switch and REC-
FRESH select switch indicators when the respec-
tive switches ON.
86U15X-227
3. Apply 12V to terminal a, and check that the indi-
cators are dim.
86U15X-228
b —id 1 L
1 1 j
k XI N_ > < / a
ir
Checking Illumination Circuit
1. Connect a jumper wire between terminal b and ter-
minal L.
2. Apply 12V to terminal a, and check that the indi-
cators are dim.
86U15X-229
15-128

16
AIR CONDITIONING
SYSTEM
OUTLINE 16— 2
AIR DISTRIBUTION 16— 2
AIR CONDITIONING COMPONENTS 16— 4
TROUBLESHOOTING GUIDE 16— 5
CIRCUIT DIAGRAM 16— 6
REFRIGERATION SYSTEM 16— 8
COMPRESSOR 16—13
ON-VEHICLE INSPECTION 16—13
REMOVAL OF COMPRESSOR 16—13
DISASSEMBLY OF MAGNETIC
CLUTCH 16—14
DISASSEMBLY OF COMPRESSOR 16—16
ASSEMBLY OF COMPRESSOR 16—18
ASSEMBLY OF MAGNETIC CLUTCH 16—20
PERFORMANCE TEST OF
COMPRESSOR 16—22
INSTALLATION OF COMPRESSOR 16—23
CONDENSER 16—24
ON-VEHICLE INSPECTION 16—24
REMOVAL OF CONDENSER 16—24
INSTALLATION OF CONDENSER.. 16—24
RECEIVER-DRIER 16—25
ON-VEHICLE INSPECTION 16—25
REMOVAL OF RECEIVER-DRIER... 16—25
INSTALLATION OF
RECEIVER-DRIER 16—25
COOLING UNIT 16—26
ON-VEHICLE INSPECTION OF
EXPANSION VALVE 16—26
REMOVAL OF COOLING UNIT 16—26
DISASSEMBLY OF COOLING UNIT 16—27
INSPECTION OF EVAPORATOR.... 16—27
ASSEMBLY OF COOLING UNIT.... 16—27
INSTALLATION OF COOLING UNIT 16—28
REFRIGERANT LINES 16—29
ON-VEHICLE INSPECTION 16—29
REPLACEMENT OF REFRIGERANT
LINES 16—29
A/C RELAY 16—30
REMOVAL OF RELAY 16—30
INSPECTION OF A/C RELAY 16—30
INSTALLATION OF A/C RELAY 16—30
THERMOSTAT 16—30
ON-VEHICLE INSPECTION 16—30
REMOVAL OF THERMOSTAT 16-30
INSTALLATION OF THERMOSTAT. 16—30
REFRIGERANT PRESSURE SWITCH 16—31
76G16X-001