1992 MAZDA PROTEGE sensor

CONTROL SYSTEM
Incorrect voltage Possible cause
VB: Battery voltage
Always below
2.W A/C does not operate l A/C relay malfunction (Refer to page U-55) l Open circuit in wiring from ignition switch to A/C relay l Open circuit in wiring from A/C relay to ECU terminal IL
AIC switch OFF but
l Short circuit in wiring from A/C relay to ECU terminal 1L
A/C ooerates l ECU malfunction
Always Va
l Poor connection at ECU connector l ECU malfunction
Always OV
l Vehicle speed sensor malfunction (Refer to page K-143)
l Short circuit in wiring from vehicle speed sensor to ECU terminal 1M
l Vehicle speed sensor malfunction (Refer to page K-143) l Open circuit in wiring from vehicle speed sensor to ECU terminal 1M
Always OV
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
Always Va
Always below 2.5V (Blower fan OK)
Always Ve (Blower fan OK)
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 IQ 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 wiring from A/C switch to blower control switch
Always OV (Blower fan OK)
Always VB (Blower fan OK)
Always below 1 .OV (Stoplight OK)
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 1s
l Open circuit in wiring from stoplight switch to ECU terminal 10
Always OV
Always Ve
l Inhibitor switch malfunction (Refer to page K-141) l Short circuit in wiring from inhibitor switch to ECU terminal 1R
l Inhibitor switch malfunction (Refer to page K-141) l Open circuit in wiring from inhibitor switch to ECU terminal 1R
Always OV
l Cruise switch malfunction (Refer to page T-21) l Short circuit in wiring from cruise switch to ECU terminal 1s
l Cruise switch malfunction (Refer to page T-21) l Open circuit in wiring from cruise switch to ECU terminal IS
Always OV
l Throttle sensor misadjustment (Refer to page F-169) l Short circuit in wiring from throttle sensor to ECU terminal 1T
l ECU malfunction
Always Va
I
l Throttle sensor misadjustment (Refer to page F-169) l Open circuit in wiring from throttle sensor to ECU terminal 1T
-
I - - -
Always approx. OV or approx. 2V l Refer to Code No.02 Troubleshooting (Refer to page F-86)
F-l 61

F CONTROL SYSTEM
VB: Battery voltage
erminal Input Output Connection to
Test condition Correct voltage Remark
28 1 0 )
1 Airflow meter Ignition switch ON Approx. 3.8V
-
2c 0 Oxygen sensor
2D 0 Fan switch Idle Approx. 3.3V
Ignition switch ON ov
Idle (Cold engine)
ov
Idle (After warm-up) O-l .ov -
increasing engine speed (After warm-up) 0.5-I .ov
Deceleration o-0.4v
Fan operating (Engine coolant tempera- ov
ture over 97OC (207°F) or diagnosis con-
nector terminal TFA grounded) -
2E 0 Water thermo-
sensor Fan not operating (Idle) VS
Engine coolant temperature 20% (68OF)
After warm-up Approx. 2.5V f&ition switch
Below 05V
2F , 0 , , Throttle sensor , Accelerator pedal released
Accelerator pedal fully depressed
2G 0
2H 0 ATF thermosensor -30°C (-20°F) -150°C (302OF) Approx. 4.9%1.12V Ignition switch
ATF
Temp 20% (68OF) Approx. 4.6V ON
130% (266OF) Approx. 1.54V
Hold switch Switch debressed ov Ignition switch
i I I
Switch released Va ON
21 0 Throttle sensor Constant 4.5-5.5v Ignition switch
ON
I , I 2J 0 Distributor Ignition switch ON Approx. OV
(G-signal) [DOHC] or 5V _-
Idle Approx. 1.5V
2K 0 Intake air ther- Ambient air temperature 20% (68’F) Approx. 2.5V Built in airflow
mosensor meter
2L - - - -
- -
2M 0 Pulse generator Engine running at idle (N range) Above 0.6V
-
(IN)
Engine stopped (Ignition switch ON) ov
2N Pulse generator Constant ov
ground
20 0 Solenoid valve ignition switch ON Va
(Purge control) -
Idle Va
2P 0 Hold indicator Hold mode Below 2V Ignition switch
ON
Normal mode VB
23UOFX-1
1 Ul Iv
I u1
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32 j3X I3V 13T13R13P13N)3L13J(3H13F( 3D 13s 2P(2N\2L12J12H12F(2D126 1V IATIlRhPjlN(1 LjlJ Ilt-illFI 1 DI 16
4-
F-l 62

CONTROL SYSTEM F
Incorrect voltage Possible cause ____-__l_ll____-
Always approx. OV or approx. 5V l Refer to Code No.08 Troubleshooting (Refer to page F-90)
IV after warm-up
Jlways approx. IV after warm-up
l Refer to Code No.15 Troubleshooting (Refer to page F-98)
l Refer to Code No.1 7 Troubleshooting (Refer to page F-100)
qlways OV
Electrical cooling fan OK)
l Open or short circuit in wiring from fan relay to ECU terminal 20 l ECU malfunction
I Always approx. OV or approx. 5V l Refer to Code No.09 Troubleshooting (Refer to page F-92)
Always constant
C\lways above 1V
4lways constant . Open circuit in wiring from ECU terminal 2F to throttle sensor
l Open circuit in wiring from ECU terminal 21 to throttle sensor l Open circuit in wiring from ECU terminal 3D to throttle sensor
l Throttle sensor misadjustment
l ATF termosensor malfunction (Refer to page K-142) l Open or short circuit in wiring from ATF termosensor to ECU terminal 2G
c\lways OV
l Hold switch malfunction (Refer to page K-140) l Short circuit in wiring from hold switch to ECU terminal 2H
4lways Va
l Hold switch malfunction (Refer to page K-140) l Open circuit in wiring from hold switch to ECU terminal 2H
Always OV
l Short circuit in wiring from ECU terminal 21 to throttle sensor airflow meter,
or water thermosensor
l Poor connection at ECU connector
Below 4.W or above 5.W
Always approx. OV or approx. I..% l ECU malfunction
l ECU malfunction
l Refer to Code No.03 Troubleshooting (Refer to page F-88)
Always approx. OV or approx. 5V 9 Refer to Code No.10 Troubleshooting (Refer to page F-94)
I
- - VB:
Battery voltage
Always constant
l Pulse genrotor malfunction (Refer to page K-142) l Open or short circuit in wiring from pulse generator to ECU terminal 2M
Above OV
l Poor connection at ground terminal l Open circuit in wiring from ECU terminal 2N to ground
F-l 63

F CONTROL SYSTEM
23UOFX-l! 51
.
r---- - --------1
I
I
i I
I
:,
m7 I
- - -.-
Fc E, Vc Ez 23UOFX-158
WATER THER@OSENSOA
I
03UOFX-21
REPLACE WASHEF
f
OYJOFX-2’
AIRFLOW METER (WITH INTAKE AIR THERMOSENSOR)
Inspection
1. Remove the airflow meter. (Refer to page F-109.)
2. Check the airflow meter body for cracks.
3. Verify that the measuring plate moves smoothly.
4. Move the measuring plate and check for resistance between
the terminals with an ohmmeter.
Specification
Terminal
E2 * Vs
E2 ++ Vc
E2
* THAA
(Intake air thermosensor)
El +, Fc Resistance (0)
Fully closed 1
Fully open
20-600 1 20-l ,000
200-400
-20% ( -4’=F): 13.6- 18.4 KQ
20% ( 6899 2.21-2.69 kD
60°C (14OOF): 493- 6670
00
0
WATER THERMOSENSOR
Removal
Note
l Water thermosensor Is placed at:
Rear of engine . . . . . . . . . . . . . . . . . . . . . . . . ..*.............. BP
Intake manifold ,.*......,..m...,..,.....*....*......... 86 -’
1. Disconnect the water thermosensor connector.
2. Remove the water thermosensor.
Inspection
1. Place the sensor in water with a thermometer and heat the
water gradually.
2. Measure resistance of the sensor with an ohmmeter.
3. If not as specified, replace the water thermosensor.
lnstallatlon
1. Install a new washer and the water thermosensor.
Tlghtening torque:
25-29 N.m (2.5-3.0 m-kg,
18-22 ft-lb)
2. Connect the water thermosensor connector.
3. Start the engine and check for coolant leakage.
F-l 68

CONTROL SYSTEM F
03UOFX-22
RESISTANCE
WI
THROTTLE VALVE
OPENING ANGLE
FULLY bPEN
03UOFX-22
03UOFX-2i
THROTTLE SENSOR
Inspection (MTX)
1. Disconnect the connector from the throttle sensor.
2. Connect an ohmmeter to the throttle sensor.
3. Insert a feeler gauge between the throttle stop screw and
the stop lever and check the continuity between terminals.
Feeler gauge Continuity between terminals
IDL - E
1 POW * E
O.lmm (0.004 in)
1 .Omm (0.039 in)
Wide-open throttle Yes
No
No No
No
Yes
Inspection (ATX)
1. Disconnect the connector from the throttle sensor.
2. Connect an ohmmeter between the throttle sensor termi-
nals E and IDL.
3. Insert a feeler gauge between the throttle stop screw and
the stop lever.
4. Check the continuity between terminals.
Feeler gauge
0.1 mm (0.004 in)
0.6mm (0.024 in) Continuity
Yes
No
5. Connect an ohmmeter to the throttle sensor terminal VT
and E.
6. Verify that the resistance increases lineally according to throt-
tle valve opening angle.
Throttle valve condition Resistance (W)
Fully closed Below 1
Fully open Approx. 5
Adjustment (MTX)
1. Disconnect the connector from the throttle sensor.
2. Connect an ohmmeter to the throttle sensor terminals IDL
and E.
3. Insert a 0.4mm (0.016 In) feeler gauge between the throt-
tle stop screw and the stop lever.
F-l 69

F CONTROL SYSTEM
0.7mm (0
GAUGE
1 SUOFX-10 3 03UOFX-235
03UOFX.22 5 IDL
E
03UOFX-22t 5
4. Loosen the two attaching screws.
5. Rotate the throttle sensor clockwise
approx. 30 degrees,
then rotate it back counterclockwise until the continuity
exists.
6. Replace the feeler gauge with a
0.7mm (0.027 in) gauge.
7. Verify that the continuity does not exist.
8. If it exists, repeat Steps 3 through 6. ‘-
9. Tighten the two attaching screws.
Note
l Do not move the throttle sensor from the set posi-
tion when tightening the screws.
10. Open the throttle valve fully a few times.
11. Recheck the adjustment of the throttle sensor.
Adjustment (ATX)
1. Disconnect the connector from the throttle sensor.
2. Connect an ohmmeter between the throttle sensor termi-
nals E and IDL.
3. Loosen the two attaching screws.
4. Insert a
0.25mm (0.01 in) feeler gauge between the throt-
tle stop screw and the stop lever.
5. Rotate the throttle sensor clockwise
approx. 30 degrees,
then rotate it back counterclockwise until there is continuity. i-
6. Replace the feeler gauge with a
0.4mm (0.016 in) gauge
and verify that there is no continuity.
7. If there is continuity, repeat Steps 4 through 6.
8. Tighten the two attaching screws.
Note
l Do not move the throttle sensor from the set posi-
tion when tightening the screws.
9. Open the throttle valve fully and verify that the resistance
between the throttle sensor terminals E and VT is
approx.
5 kQ.
F-l 70

CONTROL SYSTEM F
03UOFX-227
03UOFX-22:
03UOFX-22!
*
03UOFX-231
I
SELF-W CtECXER
WOFX-15
Replacement
1. Disconnect the throttle sensor connector.
2. Remove the throttle sensor mounting screws.
3. Remove the throttle sensor.
4. Install in the reverse order of removal.
Tightening torque:
1.6-2.4 N-m (16-24 cm-kg, 14-21 in-lb)
OXYGEN SENSOR
Inspection of Terminal Voltage
1. Warm up the engine to normal operating temperature and
run it at idle.
2. Disconnect the oxygen sensor connector.
3. Connect a voltmeter between the oxygen sensor and a
ground.
4. Run the engine
at 3,000 rpm until the voltmeter indicates
approx. 0.55V.
5. Increase and decrease the engine speed suddenly sever-
al times. Verify that when the speed is increased the meter
reads
OSV-1 .OV, and when the speed is decreased it
reads
OV-0.4V.
6. If not as specified, replace the oxygen sensor.
Inspection of Sensitivity
1. Warm up the engine to normal operating temperature.
2. Connect the
SSTs (System Selector and Self-Diagnosis
Checker)
to the diagnosis connector as shown.
3. Set the switch @to position 1.
4. Set TEST SW to 02 MONITOR.
5. Increase the engine speed to
between 2,000 and 3,000
rpm,
and verify that the monitor lamp flashes for 10 sec..
If not as specified, replace the oxygen sensor.
(Refer to page F-l 71.)
Monitor lamp: Flashes more than 8 times/l 0 seconds
F-l 71

F CONTROL SYSTEM
23UOFX-15
23UOFX-15
23UOFX-15
LOCK
4
I
13UOFX-oc
F-l 72
6. Turn the ignition switch OFF.
7. Disconnect the negative battery terminal for
at least 20 sec.
to eliminate the malfunction code that was created during
inspection from the control unit memory.
Replacetnent
1. Disconnect the oxygen sensor connector.
2. Remove the oxygen sensor.
3. Install in the reverse order of removal.
Tightening torque:
29-49 N-m (3-5 m-kg, 22-36 ft-lb)
MAIN RELAY (FUEL INJ RELAY)
Inspection
1. Verify that the main relay clicks when turning the ignition
switch ON and OFF.
2. Apply battery voltage to terminal A and ground terminal E3
of the main relay.
3. Check continuity of the terminals as shown.
VB: Battery voltage
Terminals 1 Ve not applied VB applied
C-D No continuity Continuity
4. If not as specified, replace the main relay.
CLUTCH SWITCH (MTX)
Inspection
1, Disconnect the clutch switch connector.
2. Connect an ohmmeter to the switch.
3. Check continuity of the switch.
Pedal Continuity
Depressed Yes
Released No
4. If not as specified, replace the clutch switch. ,
Replacement
1. Disconnect the clutch switch connector.
2. Loosen the locknuts.
3. Remove the clutch switch.
4. Install in the reverse order of removal.
5. Adjust the pedal height. (Refer to page H-6.)