1992 MAZDA PROTEGE engine

CONTROL SYSTEM F
CONTROLSYSTEM
PREPARATION
SST
49 9200 162
Engine Signal
Monitor
49 HO18 9Al
Self-Diagnosis
Checker
49 GO1 8 904
Sheet For
inspection of
ECU
For
inspection of
oxygen sensor
For
inspection of
ECU 49 GO18 903
Adapter
harness
49 BO19 9AO
System
Selector For
inspection of
ECU
For
inspection of
oxygen sensor
03UOFX-20
F-l 47

F CONTROL SYSTEM
STRUCTURAL VIEW
23UOFX-1:
1. Engine control unit (ECU) 8. Solenoid valve (Pressure regulator control)
- .--
Removal / Installation . . . . . . . . . . . . . . . . page F-149
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page F-149
2. Circuit opening relay
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . page F-l 29
Inspection ,...,........................... page F-l 29
3. Clutch switch (MTX)
inspection . . . . . . . . . . . . . . . . . . . . . . . . . page F-l 72
4. Airflow meter (With intake air thermosensor)
Inspection .,..........,...,............... page F-l 68
5. ISC valve
Inspection .,*,........,.,.........,....... page F-116
Removal / Installation . . . . . . . . ,.... page F-l 09
G-Throttle sensor
Inspection . . . . . . . . . . . . , . . . . . . page F- 169
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . page F-l 09
7. Solenoid valve (VICS) [DOHC]
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page F-l 18 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9. Water thermosensor
Inspection. . . . . . . .
Removal I Installation ....I..........
10. Solenoid valve(Purge control)
Inspection ,............ ,..................
11, Main relay (FUEL INJ relay)
Inspection. ..,............................
12. Neutral switch (MTX)
Inspection ,.,,,,....I.l,,.........I.......
Replacement . . . . . . .
13. Oxygen sensor
Inspection,. . . .
Replacement . , . . . .
14. P/S pressure switch
Inspection . . ..__.._._._........
Replacement . , . . . . . . . . . . . . . page t-135
page F-l 68
page F--l 68
page F-l 40
page F-172
page F-l 73
page F-173
page F-171
page F-172
--
page F-173
page F-173
F-l 48

CONTROL SYSTEM F
SMALL TYPE
03UOFX.20:
03UOFX-20
23UOFX-13
TERMINALS
AANDB
c “.w a ,.1/M rrmrrm
_-
03UOFX-201
ENGINE CONTROL UNIT (ECU)
Removal / Installation
1. Remove the side walls (driver’s side and passenger’s side).
(Refer to page S-94.)
2. Remove the bolts and nuts.
3. Disconnect the ECU connectors.
4. Install a
new ECU in the reverse order of removal.
Inspection
1. Disconnect the ECU connectors.
2. Connect the
SSTs (Engine Signal Monitor and Adapt-
er)
to the ECU as shown,
3. Set the SST (Sheet) on the Engine Signal Monitor with
the specified side fancing up as shown.
Note
l MTX...48 PIN
l ATX...84 PIN
4. Measure the voltage at each terminal.
(Refer to pages F-150 to F-167.)
5. If any ECU terminal voltage is incorrect, check the related
input or output devices and wiring. If no problem is found,
replace the ECU. (Refer to above.)
Caution
l Never apply voltage to SST terminals A and B.
F-l 49

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
Ve: Battery
arminal Input Output Connection to lest condition Correct voltage Remark
2A - - Ground (Injector) Constant ov -
28 - - Ground (Output) Constant ov -
2c - - Ground (CPU) Constant ov -
2D - - Ground (Input) Constant ov -
2E 0 Distributor Ignition switch ON
Approx. OV
(Ne-signal) or 4.5-5.5V -
Idle Approx. 2V
2F - - - - - -
2G 0 Distributor Ignition switch ON Approx. OV
(G-signal) [DOHC] or 4.5-5.5V
Idle Approx. 1.5V
2H 0 Ground (California) Constant ov
-
Main relay Ignition switch ON Va
(Canada)
21 - - - - - -
2J 0 Open Constant Approx. l-29 -
2K 0 Throttle sensor Constant 4.5-5.5v
(ATX)/Airflow meter
-
2L 0 Throttle sensor
(Power switch) Accelerator pedal released
Accelerator pedal fully depressed Approx. 4.5~5%
ov -
2M 0 Throttle sensor Accelerator pedal released
Accelerator pedal fully depressed Approx. 0.5V
Approx. 4.OV -
2N 0 Oxygen sensor 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
20 0 Airflow meter Ignition switch ON Approx. 3.8V
-
Idle Approx. 3.3V
2P 0 Intake air ther- Ambient air temperature 20% (68OF) Approx. 2.5V Built in airflow
mosensor meter
2Q 0 Water thermo- Engine coolant temperature 20% (68’F) Approx. 29
_
sensor
After warm-up Below 0.5V
2R - - - - -
- 711 ICIFX-12 voltage
_““_. ,. .I 7
1 r u-
r-i Ll r
2Y 2w 2u 2s 20 20 2M 2K 21 2G 2E 2~2 2A 1U 1s 1Q 10 lft,j ,K ,, ,G ,E ,c ,A
22 2x 2v 2T 2R 2P 2N 2L 2J 2H 2F 2D 28
IV 1T fR 1p 1N 1L 1J ,H IF ID ,B
F-l 54

F CONTROL SYSTEM
Ve: Battery voltage
erminal Input Output Connection to
Test condition Correct voltage Remark
2s 0 Solenoid valve
Engine speed below 5,000 rpm ov VICS: Variable In-
(VICS)
Engine speed above 5,000 rpm
VB ertia Charging
System [DOHC]
2T 0 Solenoid valve
60 [DOHC]/120 [SOHC] seconds after ov
(Pressure regula- engine started when engine coolant tem-
tor) [BP] perature above 90% (194OF) and intake
-
air temperature above 58% (136’F)
[DOHC]/50% (122OF) [SOHC]
Other condition at idle
Ve
2u
0 Injector (Nos. 1, 3) Ignition switch ON V0 *Engine Signal
idle
VB Monitor: Green
Engine speed above 2,000 rpm on de-
VB and red lamps
flash
celeration (After warm-up)
2v 0 Injector (Nos. 2, 4) Ignition switch at idle
Ve
idle
VI3
Engine speed above 2,000 rpm on de-
VB celeration (After warm-up)
2w
0 ISC valve Ignition switch ON Approx. 7V
-
Idle
Approx. QV
2x 0 Solenoid valve Ignition switch ON
VB (Purge control) -
Idle VB
2Y - - - - - -
23UOFX-1:
I r
U----l l-l
Ll I-
2y
2w 2u 2s 20 20 2M 2K 21 23 2E 2C 2.4 1U 1s 10 10 1M 1K 11 1G 1E 1~ IA
2z 2x 2’4 2T 2R 2P 2N 2L 2J 2l-i 2F 2D 28 IV 1T 1R lp IN IL 1J 1~ 1F If) 1~ -/
F-l 56

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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 20)21Vi,2~]2112Gj2E)2Cj2~ iuI1s]l~lollMIlKI1IJ1~~t~l1Cj1~
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

F CONTROL SYSTEM
srmina
3A
38
3c
3D
3E
3F
3G
3H
31
3J
3K
3L
3M
3N
30
3P
3Q
3R
3s
3T I input Output Connection to
Test condition Correct voltage Remark Battery voltage t
- -
Ground (Injector) Constant OU -
- -
Ground (Output) Constant OU -
- -
Ground (CPU) Constant OU -
- -
- Ground (Input) Constant ov
0 Inhibitor switch
D range VB Ignition switch
(D range) ON
Other ranges ov
0 DRL relay Parking brake pulled with ignition switch
l DRL: Daytime
(Canada) ON (DRL OFF) Va
Running Lights
Idle (DRL ON) Below 2.5V 0
Inhibitor switch
(L range) L range
Other ranges VB
ov Ignition switch
ON
0 Inhibitor switch
(S range) S range
Other ranges Va
ov Ignition switch
ON
_-__. - -. -
0 Solenoid valve Engine speed below 5,000 rpm Below 1.5V WCS: Variable In-
(VICS)
Engine speed above 5,000 rpm VB ertia Charging
System [DOHC]
- - -
- - -
- -
- - -
- - -
- - -
0 Solenoid valve 60 [DOHC]/120 [SOHC] seconds after Below 1.5v
(Pressure regula- engine started when engine coolant tem-
tor) [BP] perature above 90% (194*F) and intake
-
air temperature above 58% (136OF)
[DOHC]/50”C (122“F) [SOHC]
Other condition at idle Va
- - - - - -
- -
-
A- - -
- -
- I -
0 ISC valve Ignition switch ON VS
l Engine signal
Monitor: Green
I I Idle I
Approx. 1 OV and red lamps
flash
I
-
- - - -
-
- - - -
- - - - - -
23UOFX-1’
‘) )
U- r, )
IJ- l-1
I 1 r
3Y I3W I3U [3S13d3&M13K 31 13Gj3EI 3C
I3A 20/2M;2K( 21 12G(2E12C12A 1 U 11 Sll o]lOll MI1 K 1 I (1 G(1 E[ 1
C 11 A
32 13x [ 3V(3~(343~I3N[3~ 3~(3~(3~13~ 136 2P12N(2L[2J12H(2F(2D126 iv I~TI~RI~P(~NIIL i~(lii(l~I lo(le
.
F-l 64