relay MAZDA 626 1987 Workshop Manual

FUNDAMENTAL PROCEDURES G
Depending on where they are;
1. Sealant should be applied to gaskets
2. Oil should be applied to the moving components
of parts
3. Specified oil or grease should be applied at the
prescribed locations (oil seals, etc.) before as-
sembly.
47U0GX-012
ADJUSTMENTS
Use suitable gauges and/or testers when making var-
ious adjustments.
67U0GX-002
ELECTRICAL SYSTEM
Be sure to disconnect the battery cable from the nega-
tive (-) terminal of the battery.
Never pull on the wiring when disconnecting con-
nectors.
When locking connectors, make sure to listen for a
click that will let you know they are securely locked.
Handle sensors and relays carefully. Be careful not
to drop them or strike them against other parts.
47U0GX-014
RUBBER PARTS AND TUBING
Always prevent gasoline or oil from getting on rub-
ber parts or tubing.
47U0GX-015
G—5

3A COOLING FAN
COOLING FAN
SYSTEM CIRCUIT
IG1 IG Relay
*
No.1
relay
Water thermo switch
I With A/C

CM)
Main fan
1
L..±
No.2
relay
IG2
Add.
relay ol
(M)
A/C sw.
Add fan
86U03X-019
CIRCUIT INSPECTION
1. Turn the ignition switch ON.
2. Disconnect the water thermo switch connector, and
check that the fan operates.
3. If the fan doesn't operate, check the fuse, fan re-
lay, fan motor, thermo switch and wiring harness.
76G03A-010
3 A—12

3B COOLING FAN
COOLING FAN
SYSTEM CIRCUIT
I
IG1 IG Relay Main fuse
©
Main fan motor
V-f motor
IG1
Water thermo switch OFF: over 91°C (208 °F)
Water thermo switch ON:
below 84°C
(183°F)
76G03B-015
CIRCUIT INSPECTION
1. Turn the ignition switch ON.
2. Disconnect the water thermo switch connector, and
check that the fan begins to operate.
3. If the fan doesn't operate, check the fuse, fan re-
lay, fan motor, thermo switch, and wiring harness.
76G03B-016
3B—10

4A PTC HEATER SYSTEM
PTC HEATER SYSTEM
[FE
and
F8 engine (except Middle
East)]
76G04A-071
The PTC heater system consists of the PTC heater, relay, and water thermo switch. The system is
designed to prevent carburetor icing when the engine operating temperature is low t assure optimum
driveability.
TROUBLESHOOTING
Note
Make the system inspection first. If no problem is found, continue with the next inspec-
tion of the Troubleshooting Guide. (Refer to pages 4A—19, —20, or—22)
FE 8Valve—Unleaded Fuel
Possible cause System
inspection
Water thermo switch (intake manifold)
PTC heater
Water
thermo
switch
(Radiator)
PTC heater
relay
Page 4A—43 4A—41 4A—43 4A—95 4A—44
Checking order 1 2 3 4 5
Except FE 8Valve—Unleaded Fuel
Possible cause System inspection
Water thermo switch (Radiator)
PTC heater PTC heater
relay
Page 4A—43 4A—95 4A—43 4A—44
Checking order 1 2 3 4
76G04A-072
4A-42

4A PTC HEATER SYSTEM
PTC Heater Relay
1. Apply 12V to No. 1 terminal and ground No. 2
terminal).
2. Check for continuity at terminals 3 and 4 with an
ohmmeter.
Operation OV 12V
Terminals 3—4 No continuity Continuity
76G04A-077
4A—44

4A DECELERATION CONTROL SYSTEM
COASTING LEANER SYSTEM (F6 SINGAPORE MTX)
Coasting leaner
0 oAir
a n, © © Battery Ignition
switch Secondary
throttle valve
| / Relay
Engine control unit
Ignition coil
76G04A-102
This system consists of the coasting leaner solenoid valve, engine control unit, ignition coil, and idle switch.
When the idle switch is ON and the engine speed is more than approx. 2,100 rpm (deceleration),
the coasting leaner solenoid valve opens the air passage port to prevent afterburn in the exhaust system.
Troubleshooting
Note
Make the system inspection first. If no problem is found, continue with the next inspec-
tion of the Troubleshooting. (Refer to page 4A—47)
Possible cause System inspection Coasting leaner solenoid valve Relay
Page 4A—56 4A—57 4A—57
Checking order 1 2 3
Coasting leaner System Inspection
1. Warm up the engine and run it at idle.
2. Connect a tachometer to the engine.
3. Connect a voltmeter to the coasting leaner sole-
noid valve connector (LgB wire).
76G04A-103
4A—56

DECELERATION CONTROL SYSTEM 4 A
76G04A-104
4. lift the idle switch lever. (Idle switch ON).
5. Increase the engine speed to 3,000 rpm and then
decelerate.
6. Check the terminal voltage.
Voltage:
76G04A-105
Above approx. 2,100 rpm Below 1.5V
Below approx 2,100 rpm Approx. 12V
Coasting Leaner Solenoid Valve
1. Disconnect the connector of the coasting leaner
solenoid valve.
2. Disconnect the connector of the idle switch.
3. Apply 12V to terminal (BW wire) and ground with
a jumper wires as shown in the illustration.
4. Check that the coasting leaner solenoid valve
"clicks" when making and breaking the circuit. Re-
place, if necessary.
Relay
1. Warm up the engine and run it at idle.
2. Connect a tachometer to the engine.
3. Increase and decrease the engine speed between
1,900—2,300 rpm and check that the relay
"clicks".
4. Replace if necessary.
76G04A-106
4A—57

IDLE-UP CONTROL SYSTEM 4A
DUAL-SERVO DIAPHRAGM TYPE
With P/S and A/C
Solenoid valve (for P/S)
69G04B-124
Operation
A/C ON and compressor operating
Current flows through the A/C relay to the two-way solenoid valve for the A/C. Vacuum port A is opened,
and vacuum is applied to the servo diaphragm, which in turn pulls the throttle plates slightly open
at low speeds.
P/S operating
Current flows through the P/S switch to the three-way solenoid valve for power steering. Vacuum port
B is opened and vacuum is applied to the servo diaphragm, which in turn pulls the throttle plates slightly
open.
Relationship
Equipment
Type P/S A/C P/S & A/C
Single-servo
diaphragm type O O
Dual-servo
diaphragm type O
4A—69

IDLE-UP CONTROL SYSTEM 4 A
FE (Middle East) and F6 (General)
Possible cause
jrvo

diaphragm

3
jrvo

diaphragm

n c o> (0
E 3 3 O
® >
a >
•o o c e
£ O **
S M O
£ O
'i (0 (0
O <
o a
o E W 0)
lm Q.
c a k 4) -
9-5
"S "5 (O > CO < a. DC H Js * OC M
Page 4A—72 4A—74 4A—74 Section 15 4A—75 Section 16
Checking order 1 2 3 4 5 6 7 8
76G04A-136
FE 8Valve—Unleaded Fuel
Posible cause

Engine

control

unit

terminal

Servo

diaphragm

Vacuum

signal

Solenoid

valve £ O **
S CO O
£ U
S <0 U) Relay
(for
A/C) ** n ** w o E «
Refrigerant
pressure

switch
H D I Servo

diaphragm

Vacuum

signal

Solenoid

valve
< a. Relay
(for
A/C)
H Refrigerant
pressure

switch

Page 4A—91 4A—72 4A—74 4A—74 Section 15 4A—75 Section 16
Checking order 9 1 2 3 4 5 6 7 8
76G04A-137
4A—71

4A CONTROL SYSTEM
Terminal
(Wire color) Connected to Condition Voltage

I
(LgB)
Idle switch Idle switch
ON
Below 1.5 V I
(LgB)
Idle switch
Idle switch OFF Battery voltage
J
— —
76G04A-174
( I
G
X
C
0
X
H F D B

F6 Engine (Singapore)
Terminal
(Wire color) Connected to Condition Voltage

A
— — —

B
(YL) Ignition coil Ignition switch
ON
and engine running Battery voltage
C
(B)
Ground
— —

D
(GB) Relay Engine speed below approx. 2,100
rpm
Below 1,5V D
(GB) Relay
Engine speed above approx. 2,100
rpm
Battery voltage
F
(BW) Ignition switch Ignition switch
ON
Battery voltage

76G04A-175
4A—92