light MAZDA PROTEGE 1992 Service Manual

SELF-DIAGNOSIS FUNCTION F
SWITCH MONITOR FUNCTION
Individual switches can be inspected by the SST (Self-Diagnosis checker).
Note
l The TEN terminal of the diagnosis connector must be grounded and the ignition switch ON
(engine stopped).
l If either of the switches remain activated, the monitor lamp will be illuminated.
ECU
NEUTRAL SWITCH (MTX)
CLUTCH SWITCH (MTX)
=d-’ 1
BATTERY
INHIBITOR SWITCH (ATX)
STOPLIGHT SWITCH (MTX)
HEADLIGHT SWITCH MONITER LAMP
REAR WINDOW (SELF-DIAGNOSIS CHECKER)
DEFROSTER SWITCH
AIC SWITCH
BLOWER SWITCH
THROTTLE SENSOR asp-
- _
COOLING FAN SWITCH
03UOFX
Switch
Clutch switch
Neutral switch (MW
(M-W Self-Diagnosis Checker (Monitor lamp)
Light ON Light OFF Pedal released Pedal depressed
In gear Neutral Remark In gear
Clutch pedal released
Inhibitor switch
(ATX) L, S, D or R range
N or P range -
Throttle sensor Pedal depressed (Not fully) Pedal released/fully depressed -
Stoplight switch
Pedal depressed Pedal released -
Headlight switch
ON
OFF Headlights/parking lights: ON
Blower switch
ON
OFF Blower switch at 2nd or
above position
AIC switch
ON OFF Fan speed control at 1st po-
sition
Rear window defroster
switch ON
OFF -
Water thermoswitch Fan operating Fan not operating -
23UOFX-084
F-l 05

SELF-DIAGNOSIS FUNCTION
Inspection Procedure
1. Connect the SST (System Selector) to the diagnosis con-
nector.
2. Set the switch @ to position 1.
3. Set TEST SW to SELF-TEST.
03UOFX.090
MONITOR LAMP
T
03UOFX-091
Procedure
4. Connect the SST (Self-Diagnosis Checker) to the System
Selector and a ground.
5. Set the select switch of the Self-Diagnosis Checker to posi-
tion A.
6. Turn the ignition switch ON.
7. Check if Monitor Lamp illuminates when each switch is made
to function as described below.
Caution
* If either of the switches remain activated, the mon-
itor lamp will be illuminated.
l Do not start the engine.
I
I Set conditions to deactivate each switch l All accessories OFF l Transaxle in neutral l All pedals released NO
-
Verify that monitor lamp does not illuminate
YES
Check each switch as described Check each switch and related wire harness
*Clutch and Neutral CT- pages F-l 72,173
switch
*Throttle sensor w page F-169 l Stoplight switch c7 Section T l Headlight switch c7 Section T l Rear defroster switch T;P Section T l Blower switch [r+ Section T
l Inhibitor switch a Section K l A/C switch 0 Section U l Water thermoswitch c7 Section E
23UOFX-OS!
Neutral and Clutch switch (MTX)
Shift transaxle into gear
Check that monitor lamp illuminates with clutch pedal
released
YES NO PC: l Neutral switch malfunction a page F-173 l Clutch switch malfunction w page F-172
*Open circuit in related wire
harness
l ECU terminal 1 V voltage
incorrect w page F-152
l ECU malfunction
Depress clutch pedal
Check that monitor lamp does not illuminate
Return transmission to neutral PC:
*Clutch switch malfunction w page F-172
23UOFX-088
F-l 06

SELF-DIAGNOSIS FUNCTION
Headlight switch
Turn headlight switch ON
Check that monitor lamp illuminates
YES
Headlight switch OK
Turn headlight switch OFF NO
PC: l Headlight switch malfunction v Section T
*Open circuit in wire harness
from headlight switch to ECU
l ECU terminal 1 U (MTX) 1 H
(ATX) voltage incorrect CT page F-152
l ECU malfunction
23UOFX-087
Rear window defroster switch
Turn rear window defroster switch ON
Check that monitor lamp illuminates
YES
Rear defroster switch OK
Turn rear window defroster switch OFF NO
_ PC: *Rear window defroster switch
malfunction c7 Section T
*Open circuit in wire harness
from rear window defroster
switch to ECU
l ECU terminal 1 T (MTX) 1 J (ATX)
voltage incorrect
u page F-152
l ECU malfunction
23UOFX-088
Inhibitor switch (ATX)
Shift transaxle into L, S, D, or P range
Check that monitor lamp illuminates
YES
Inhibitor switch OK
Shift into P or N range PC: l Inhibitor switch malfunction
*Open or short circuit in related
23UOFX-089
F-l 07

SELF-DIAGNOSIS FUNCTION
Throttle sensor
Depress accelerator pedal (not fully) and check that
monitor lamp illuminates
YES NO
PC: *Throttle sensor malfunction CT page F-169
*Short circuit in wire harness
from throttle sensor to ECU
*ECU terminal 1 N (MTX) 1T
(ATX) voltage incorrect CT page F-150
l ECU malfunction
Depress acceleration pedal fully and check that monitor
No : PC: *Throttle sensor malfunction w page F-169
lamp does not illuminate *Open circuit in wire harness
from throttle sensor to ECU
YES *ECU terminal 2L (MTX) or 21
(ATX) voltage incorrect a page F-154
Throttle sensor OK
Release accelerator pedal
23UOFX-090
Stoplight switch
Depress brake pedal
Check that monitor lamp illuminates
YES
Stoplight switch OK
Release brake pedal NO
PC: *Stoplight switch malfunction w Section T
*Open circuit in wire harness
1
from stoplight switch to ECU
*ECU terminal 10 (MTX) 1Q
(ATX) voltage incorrect CT page F-l 52
l ECU malfunction
23UOFX-091
Blower switch
---
Turn blower switch to 2nd or higher position
Check that monitor lamp illuminates
YES
Blower switch OK NO
__L PC: *Blower switch malfunction
*Open circuit in wire harness
from blower switch to ECU
l ECU terminal 1 S (MTX) 1 P
(ATX) voltage incorrect
l ECU malfunction p Section T
w page F-152
23UOFX-092
F-l 08

F PRESSURE REGULATOR CONTROL SYSTEM
PRESSURE REGULATOR CONTROL SYSTEM (BP ENGINE)
THERMOSEN
SOLENOID VALVE
(PRESSURE REGULATOR CONTROL)
(FROM DELIVERY
FUEL
(TO FUEL TANK)
Engine
BP SOHC
BP DOHC Coolant temperature
Above 90% (194*F) Operating condition
Intake air temperature
Above 50°C (122OF)
Above 58OC (136OF) Engine condition . Operating time (set)
Throttle valve fully closed
Approx. 120
or no load condition
Approx. 60
#.nr IAt-%/ 4 7
To prevent percolation of the fuel during hot restart idle, vacuum to the pressure regulator is momentarily
cut, and the fuel injection pressure is increased to slightly more than 284 kPa (2.9 kg/cm2, 41.2 psi).
F-l 34

F POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM
POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM
DESCRIPTION
The PCV valve is operated by the intake manifold vacuum.
When the engine is running at idle, the PCV valve is opened slightly and a small amount of blowby gas
is drawn into the dynamic chamber to be burned.
As the engine speed rises the PCV valve is opened further, allowing a larger amount of blowby gas to be
drawn into the dynamic chamber.
23UOFX.1; !5
-7
F-l 38
9MUOF2-164
PCV VALVE
Inspection
OBUOFX-176
1. Warm up the engine to the normal operating temperature
and run it at idle.
2. Disconnect the PCV valve with the ventilation hose from the
cylinder head cover,
3. Block the PCV valve opening.
4. Verify that there is vacuum.
5. Remove the PCV valve.
6. Blow through the valve from port @ and verify that air
comes out of port @I.
7. Blow through the valve from port @ and verify that no air
comes out of port @.
8. Replace the PCV valve if necessary.

CONTROL SYSTEM
Terminal voltage (MTX)
VB: Battery voltage
wminal Input Output Connection to Test condition Correct voltage Remark
1A - - Battery Constant VB For backup
1B 0 Main relay OFF OV
(FUEL INJ relay) Ignition switch ._-
ON VB
1c 0 Ignition switch While cranking Approx. 10V
(START) -
Ignition switch ON ov
10 0 Self-Diagnosis Test switch at “SELF-TEST” With Self-
Checker Lamp illuminated for 3 sec. after ignition 4.5--5.5v Diagnosis Check-
(Monitor lamp) switch OFF+ON er and System
Lamp not illuminated after 3 sec. VEI Selector
Test switch at “02 MONITOR” at idle
Monitor lamp illuminated 4.5-5.5v
Test switch at
“02 MONITOR” at idle
Monitor lamp not illuminated Va
1E 0 Malfunction indica- Lamp illuminated for 3 sec. after ignition
Below 2.5V With System
tor lamp (MIL) switch OFF-ON Selector test
Lamp not illuminated after 3 sec.
VB switch at
“SELF-TEST”
Lamp illuminated Below 2.5V
Lamp not illuminated VR
1F
0 Self-Diagnosis Buzzer sounded for 3 sec. after ignition
Below 2.5V
l With Self-
Checker switch OFF+ON Diagnosis
(Code Number)
Buzzer not sounded after 3 sec. VE - Checker and
Buzzer sounded Below 2.5V System Selector
l With System
Buzzer not sounded
VB Selector test
switch at
“SELF-TEST”
1G 0 Igniter Ignition switch ON ov
-
Idle Approx. 0.2V
1H - - - - - -
_-
II - - - - - -
1J
0 AIC relay Ignition switch ON
VB
A/C switch ON at idle Below 2.5V
A/C switch OFF at idle VB
-
1K 0 Diagnosis
connector
(TEN terminal) System Selector test switch at
“02 MONITOR”
System Selector test switch at
“SELF-TEST” VB
ov Ignition switch
ON
1L 0 DRL relay
(Canada) Parking brake pulled with ignition switch
Ve
l DRL.: Daytime
ON (DRL OFF) Running Lights
Idle (DRL ON) Below 2.5V
V’
F-l 50

F CONTROL SYSTEM
VB: Battery voltage
erminal Input Output Connection to Test condition Corrsct voltage Remark
1M - - - - - -
IN 0 Throttle sensor Accelerator pedal released ov Ignition switch
(Idle switch)
Accelerator pedal depressed
VB ON
10 0
1P 0 Stoplight switch
P/S pressure
switch Brake pedal released
Brake pedal depressed
Ignition switch ON
P/S ON at idle
P/S OFF at idle ov
-
VEi
Va
ov
VS -
10 0 A/C switch A/C switch ON
A/C switch OFF Below 23 Ignition switch
VS ON and blower
motor ON
1R 0
IS 0 Fan switch
Blower control
switch Fan operating (Engine coolant tempera-
ture over 97% (207OF) or diagnosis con-
nector terminal TFA grounded)
Fan not operating (Idle)
Blower control switch OFF or 1st position
Blower control switch 2nd or higher po-
sition ov
-
V0
Ve ignition switch
ov ON
IT 0 Rear window
defroster switch Rear window defroster switch OFF
Rear window defroster switch ON ov
VB
Ignition switch ON
1u 0
iv 0 Headlight switch
Neutral/Clutch
switches Headlights ON
Headlights OFF
Neutral position or clutch pedal
depressed
Others V0
-
ov
ov
VB -
1 I lr----t
r-i
ul r
2Y 2w 2u 2s 20 20 2M 2K 21 2G 2E 2’3 2A 1lJ 1s IQ 10 1M 1K 11 1G 1E 1~ 1A
22 2x 2v 2T 2R 2P 2N 2L 2J 34 2t= 2D 28 Ii/ fT 1R 1p IN 1L 1J 1H 1F 1D 18
F-l 52

CONTROL SYSTEM F
Ve: Battery voltage
Incorrect voltage
1, -
Always below l.OV
Always Ve
Always below I.OV (Stoplight OK)
Always below l.OV
Always
VB
Always below 25V (Blower fan OK)
Always
VB (Blower fan OK)
Always below 1 .OV
(Electrical cooling fan OK)
Always below 1 .OV (Blower fan OK)
Always
VB (Blower fan OK)
Always below
1 .ov
Always below l.OV Illumination lamp
ON when rear
window defroster
switch ON
Illumination lamp
never ON
(Headlights OK)
Always below l.OV
Always Ve Possible cause
-
l Throttle sensor misadjustment (Refer to page F-169)
l Short circuit in wiring from throttle sensor to ECU terminal 1N l ECU malfunction
l Throttle sensor misadjustment (Refer to page F-169) l Open circuit in wiring from throttle sensor to ECU terminal IN l Open circuit in wiring from throttle sensor to ECU terminal 2D
l Open circuit in wiring from stoplight switch to ECU terminal 10
l P/S pressure switch malfunction (Refer to page F-173) l Short circuit in wiring from P/S pressure switch to ECU terminal 1P l ECU malfunction
l P/S pressure switch malfunction (Refer to page F-173) l Open circuit in wiring from P/S pressure switch to ECU terminal 1P l Open circuit in wiring from P/S pressure switch to ground
l A/C switch malfunction (Refer to page U-55) l Short circuit in wiring from A/C switch to ECU terminal 10 l Poor connection at ECU connector l ECU malfunction
l A/C switch malfunction (Refer to page U-55) l Open circuit in wiring from A/C switch to ECU terminal 1Q l Open circuit in wirina from A/C switch to blower control switch
l Open or short circuit in wiring from fan relay to ECU terminal 1R l ECU malfunction
l Short circuit in wiring from blower control switch to ECU terminal 1s l Poor connection at ECU connector l ECU malfunction
l Open circuit in wiring from blower control switch to ECU terminal IS
I
l Open or short circuit in wiring from rear window defroster switch to ECU
terminal 1 T
l Open circuit in wiring from ignition switch to rear window defroster switch l Rear window defroster switch malfunction (Refer to page T-21)
l Open or short circuit in wiring from headlight relay to ECU terminal 1U
(Refer to page F-152)
l Neutral switch malfunction (Refer to page F-173) l Clutch switch malfunction (Refer to page F-172) l Short circuit in wirino from ECU terminal IV to neutral or clutch switch
l Neutral switch malfunction (Refer to page F-173) l Clutch switch malfunction (Refer to page F-172) l Open circuit in wiring from ECU terminal 1V to neutral or clutch switch l Poor connection at ECU connector
23UOFX-136
F-l 53

F CONTROL SYSTEM
Terminal voltage (ATX)
VB: Battery voltage
erminal Input Output
Connection to Test condition Correct voltage Remark
IA - -
Battery Constant --- Va For backup
16 0 Main relay
lgnrtion switch OFF ov
(FUEL INJ relay) -
ON Vs
IC 0 Ignition switch While cranking Approx. 1 OV
(START) -
Ignition switch ON
ov
_
ID 0 Self-Diagnosis Test switch at “SELF-TEST” With Self-
Checker Lamp illuminated for 3 sec. after ignition 4.5-5.5v Diagnosis Check-
(Monitor lamp) switch OFF-ON er and System
Lamp not illuminated after 3 sec.
VB Selector
Test switch at “02 MONITOR” at idle
Monitor lamp illuminated 4.5-5.5v
Test switch at
“02 MONITOR” at idle
Monitor lamp not illuminated VB
1E 0 Malfunction indica- Lamp illuminated for 3 sec. after ignition
Below 2.5V With System
tor lamp (MIL) switch OFF+ON Selector test
Lamp not illuminated after 3
sec. VS switch at
“SELF-TEST”
Lamp illuminated Below 2.5V
Lamp not illuminated VR
IF 0 Self-Diagnosis Buzzer sounded for 3 sec. after ignition
Below 2.5V
l With Self-
Checker switch OFF+ON Diagnosis
(Code Number)
Buzzer not sounded after 3 sec.
VB Checker and
Buzzer sounded Below 2.5V System Selector
l With System
Buzzer not sounded
VB Selector test
switch at
“SELF-TEST”
IG 0 Igniter Ignition switch ON ov
-
Idle Approx. 0.2V
1H 0 Headlight switch Headlrghts ON VB
-
Headlights OFF Below 1 .OV
II
0 Diagnosis System Selector test switch at Ignition switch
connector
“02 MONITOR” VE
ON
(TEN terminal)
System Selector test switch at
“SELF-TEST” ov
1J 0 Rear window
defroster switch Rear window defroster switch OFF
Rear window defroster switch ON ov
VB
Ignition switch
- ON
1K 0 Ground (California) Constant ov
Main relay Ignition switch ON VB -
I
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F-l 58