MAZDA PROTEGE 1992 Workshop Manual

CENTRAL PROCESSING UNIT (CPU) T
CENTRAL PROCESSING UNIT (CPU)
I I IG KEY ILLUMI.
I
T
1. 30A KEY REMIN-
0
DOOR A.lAR
WARNING LAMP
TNS
REAR WIPER SW
rb
T
RASSIVE CONTROL UNIT -
SYSTEM DIAGRAM
CPU SEAT BELT WARNING LAMP
m
w
REAR WASHER SW
IGl
REAR WASHER
03UOTX-08! 3
T-55

T CENTRAL PROCESSING UNIT (CPU)
CPU
Removal / Installation
1. Remove in the order shown in the figure.
2. Install in the reverse order of removal.
4. Joint box
5. CPU
13UOTX-03
Inspection
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
page T-57 1. Scuff plate
2. Seaming welt
3. Front side trim --
T-56

CENTRAL PROCESSING UNIT (CPU) T
Inspection
1. Remove the CPU and check the voltage or continuity between terminals of joint box and a body ground.
Ve: Battery voltage
Terminal
A Connected to Test condition Specification
B Rear wiper motor Ignition switch
Va
Light switch ON (first and second position) V0
C TNS switch
Light switch OFF ov
Seat belt buckled Ofi
D Seat belt buckle switch
Seat belt unbuckled
co
E
Rear wiper switch ON
OCI
F
Rear wiper switch
Rear wiper switch OFF
co
Rear washer switch ON 00
G Rear washer switch
Rear washer switch OFF
00
H
Key reminder switch ON
Va
I Key reminder switch
Key reminder switch OFF
ov
Ignition switch OFF ov
J Seat belt warning lamp
Ignition switch ON
VB
K Ground Constant
ov
L IG key illumination Constant
VB
For 5 seconds after ign. switch ON and belt unbuckled
00
M Passive shoulder belt
Other conditions
00
All doors closed
Va
N Door switch
Any door open
ov
0 Battery Constant VB
P Ignition switch
ignition switch ON V0
23UOTX-031
T-57

T WARNING SYSTEM
WARNING SYSTEM
WARNING BUZZER AND TIMER
Circuit Diagram
WARNING LAMP
REAR WIPER SW
RASSIVE CONTROL UNIT
Inspection
Remove the CPU and check the voltage or continuity between terminals of joint box and a body ground.
Key reminder alarm does not sound.
VB: Battery voltage
Terminal Connected to Test condition Specification To correct
I
Key reminder switch Key in cylinder VB Check ignition switch and
(ignition switch) Key out bf cylinder ov wiring harness
(Refer to page T-21)
P Ignition switch Ignition switch ON
‘/B Check ignition switch and
wiring harness
(Refer to page T-21)
N Door switch Any door open ov Check door switches and
All doors closed VS wiring harness
(Refer to page T-51)
23UOTX-031
T-58

WARNING SYSTEM
Light-off reminder alarm does not sound.
VB: Battery voltage
Terminal Connected to Test condition Specification To correct
C Headlight switch Headlight switch ON VB Check headlight switch and
wiring harness
(Refer to pages T-27, 28)
P Ignition switch Ignition switch ON VB Check ignition switch and
wiring harness
(Refer to page T-21)
N Door switch Any door open ov Check door switches and
All doors closed V0 wiring harness
(Refer to page T-51)
23UOTX-033
Seat belt alarm does not sound.
VB: Battery voltage
Terminal Connected to Test condition Specification To correct
P ignition switch Ignition switch ON
Vs Check ignition switch and
wiring harness
(Refer to page T-21)
D Seat belt buckle switch Seat belt buckled
00 Check seat belt buckle switch
Seat belt unbuckled
00 and wiring harness
(Refer to page S-102)
23UOTX-034
Seat belt timer does not operate.
VB: Battery voltage
Terminal Connected to Test condition Specification To correct
P Ignition switch Ignition switch ON VE Check ignition switch and
wiring harness
(Refer to page T-21)
23UOTX-035
Passive shoulder belt alarm does not sound.
VB: Battery voltage
Connected to Test condition
Ignition switch Ignition switch Specification
VB
Passive shoulder belt
control unit For 5 seconds after
ignition switch and belt
unbuckled
Other conditions 00
co
IG key illumination timer does not operate.
To correct
I
Check ignition switch and
wiring harness
(Refer to page T-21)
Check passive shoulder belt
control unit and wiring harness
(Refer to page S-104)
23UOTX-036
Ve: Battery voltage
Terminal Connected to Test condition Specification To correct
L IG key illumination Either door open
VB Check bulbs and wiring
harness
N Door switch Any door open ov Check door switches and
All doors closed
VB wiring harness
(Refer to page T-51)
23UOTX-037
T-59

2L BUZZER 2A 28 2C 20 1A 3K - - -
n n n n n
nn
1 1
1
BELTS
OIL
3w
3W
u u uuu u u u u
L-l u u u u
1C 3L 2E 2G 11
1G 1F 1D 1B
3F 38 3G 1E 30
n II 11 l-l l-l It 11 l-l
1J 11 1H 1G IF 1E 1D lG 1B 1A 2L 2K 2J 21 2H 2G 2F 2E 20 2G 28 2A
n Ir ,I
3L 3K 3J 31 3i-l 3G 3F 3E 3,, 3~ 3B 3A
Ter-
minal Connected to
tA Combination switch
1B Ground
1C Fuel tank unit
ID EGI control unit
1E Washer level sensor
1F Fuel tank unit
1G EC-AT control unit
1H EC-AT control unit
II
1J I Connected to Ter-
minal
2A Speed sensor output
28 Light switch (high beam)
2C Turn switch (L1

WARNING SYSTEM T
13UOTX-07
63U15X-05
, I//
‘nF -
-
-
FUEL
13UOTX.08C
- CHARGE
13UOTX-08
13UOTX-08
Inspection
Brake system warning lamp
1. Disconnect the connector from the brake fluid level sensor.
2. Connect a jumper wire between “G/Y” and “6” terminal
(body ground).
3. Start the engine and check that the BRAKE warning lamp
illuminates.
Caution
l Be sure that the parking brake is fully released be-
fore checking.
4. If there is no illumination, check the fuse, bulb, and wiring
harness.
Brake fluid level sensor
Connect an ohmmeter to each terminal of the brake fluid lev-
el sensor connector.
Check for continuity when the float is moved up and down.
The sensor is good if there is continuity when the float is be-
low the “MIN” mark, and if there is no continuity when the
float is above the “MAX” mark. If the sensor does not pass
this test, replace it.
Fuel-level warning lamp
1. Disconnect the connector from the fuel tank unit.
2. Connect the connector terminal “W/R” to the body ground.
3. Start the engine and check that the FUEL warning lamp il-
luminates.
4. If there is no illumination, check the fuse, warning lamp, and
wiring harness.
Alternator warning lamp
1. Start the engine, connect the connector terminal “W/B” to
a body ground.
2. Check that the alternator warning lamp illuminates.
3. If there is no illumination, check the warning lamps, wiring
harness and alternator. Replace or repair as necessary.
Engine oil pressure warning lamp
1. Disconnect the connector from the oil pressure switch.
2. Start the engine and connect the connector terminal “Y/R”
to a body ground.
3. Check that the “OIL” warning lamp illuminates. If it does
not, replace the sender switch or repair the wiring harness
if bulb is not burnt out.
T-61

T
I WARNING SYSTEM
Washer fluid warning lamp
1. Disconnect the connector from the washer fluid level sensor.
2. Start the engine and with a jumper wire to connect the con-
nector terminal “a” (LGIW) to a body ground.
3. Check that the washer fluid warning lamp illuminates.
If it does not and the bulb is not burnt out, replace the fluid
level sensor or repair the wiring harness.
13UOTX-08
_-
1 /
J TERMINAL -
13UOTX-08
13UOTX-08
Seat belt warning lamp
1, Remove the CPU.
2. Connect the connector J terminal (joint box side) to a body
ground.
3. Turn ignition switch to ON and confirm that BELT warning
lamp illuminates for about 6 seconds.
4. If there is no illumination, check the fuse, warning readout
and wiring harness.
Check bulb, CPU and wiring harness and switch, repair or
replace as necessary.
Malfunction indicator lamp
1, Connect the “Y/B” wire to a body ground.
2. Start the engine and check that the warning lamp illuminates.
3. If there is no illumination, check the meter fuse, bulb, and
wiring harness between the instrument cluster and the EGI
control unit.
T-62

INSTRUMENT CLUSTER T
INSTRUMENT CLUSTER
PREPARATION
SST
I
I
49 0839 285
Checker, fuel
thermometer For
inspection of fuel
and water
temperature
gauge
I I
I
23UOTX-038
STRUCTURAL VIEW
WITH TACHOMETER (2WD)
WITHOUT TACHOMETER (2WD)
1. Speedometer 4. Fuel gauge
Troubleshooting . . . . . . . ..*................ page T-64 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . page T-64
Inspection .,.......,,.......,,...,,.......... page T-71 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page T-71
2. Tachometer 5. Warning and indicator
Troubleshooting ..,....................... page T-64 Inspection ,.......,,......................... page T-61
inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page T-71 6. Odometer
3. Water temperature gauge 7. Tripmeter
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . page T-64
Inspection .,,........,,,,......,,............ page T-72
T-63

2L BUZZER 2A 28 2C 2D 1A 3K l--r nnmn
I I‘ I
1C 3L 2E 2G IL iG 1F 1D tB
3F 38 3G 1E 3D
l-l rt
II l-l
l-l It II l-l 1J 11 1H
1G IF 1E 1D 1C 1B 1A 2L 2K 2J 21 2H 2G 2F 2E 2D 2C 28 2A
r-l It ,I 3L 3K 3J 31 3H 3G 3F 3E 3D 3C 3B 3A
Ter- I I minal Connected to 1 1A Combination switch
1B Ground
IC Fuel tank unit
1 ID 1 EGI control unit
I
II L 1J 1
L Ter-
minal Connected to
2A Speed sensor output
28 Light switch (high beam)
2C Turn switch (L)
20 Turn switch (R)
2E Ground
2F Ground
2L 1 IGI battery Ter-
minal Connected to
3A
38 Alternator
3c
30 Oil pressure switch
3E
3F Parking brake switch, Brake fluid switch
3G Passive shoulder belt control unit
3H h
I 31
3J
3K
IG2 battery
3L Water temperature gauge unit