MAZDA PROTEGE 1992 Workshop Manual

SELF-DIAGNOSIS FUNCTION F
Circuit Diagram
MTX
I
L/W I
I FROM CIRCUIT-
+ OPENING RELAY
LG
DIAGNOSIS CONNECTOR
BILG I
p,
+ ,
RIB BlBR 1 R LGIR LG
LIW
BILG
I B
, 0
a I
I
WATER /c
== //& $k $k $&
z-z 1== == = = $k
== $
THERMOSENSOR
+$ E G C F D A B
BILG
BlBR
kr%J
,, BIBR,
> 0 I
AIRFLOW METER
INTAkE AIR THERMOSENSOR
23UOFX-06:
ATX
I
ECU
WATER
THERMOSENSOR
I BIBR BlLG I
4
I R
RIB BlBR ,
0 BILG _
0 I
I
I
== p+ 9+
fT ,= JJk
==
E G C F
BILG
I
LG
DIAGNOSIS CONNECTOR
LGlR t”-cE-
AIRFLOW METER
23UOFX-06I
F-95

F SELF-DIAGNOSIS FUNCTION
:ODE No. 12 (THROTTLE SENSOR - ATX)
iTEP INSPECTION ACTION
1 Check throttle sensor circuit for poor connection Yes Repair or replace connector
No Go to next step
2 Check wire harness between throttle sensor and Yes Go to next step
ECU for continuity
Throttle sensor ECU - No Repair or replace
A (LG/R) 2K (MTX) 21 (ATX)
B U-4 2M (MTX) 2F (ATX)
D (BIBR)
20 (MTX) 3D (ATX)
3 Check if resistances between terminals B (LGIW)
Adjust or replace throttle sensor w page F-169
4
r.%$ if$CU terminal 2M (MTX) 2F (ATX) volt- Yes Replace ECU w page F-149
w page F-154 NO
Check for short circuit in wiring from
throttle sensor to ECU
23UOFX-06
.-’

SELF-DIAGNOSIS FUNCTION F
Circuit Diagram
ATX
I
1 THROTTLE SENSOR
F-97

F SELF-DIAGNOSIS FUNCTION
CODE No.
STEP
1
Repiace ECU -- -.. - 14 (ATMOSPHERIC PRESSURE SENSOR - IN ECU)
ACTION
m page F-149 -.
23UOFX-069
:ODE No. 15 (OXYGEN SENSOR - INACTIVATION)
Note
l If Code Nos. 15 and 17 are both present, first perform the checking procedure for Code No.17
iTEP
INSPECTION ACTION
1 Check oxygen sensor circuit for poor connection
YeSi Repair or replace connector
No Go to next step
2 Check if oxygen sensor output voltage is OK Yes
Go to next step
rr5+ page F-171
No Replace oxygen sensor
3 Check wire harness between oxygen sensor and Yes Go to next step
ECU terminal 2N (MTX) 2C (ATX) for continuity
NO Repair or replace
4 Check if ECU terminal 2N (MTX) 2C (ATX) volt-
Yes Go to next step
age is OK
w page F-154
No
Check for short circuit in wiring from
oxygen sensor to ECU
5 Check if sensitivity of oxygen sensor is OK
Yes Replace ECU
w page F-149
CT page F-171
No Try known good oxygen sensor and
check if condition improves w page F-172
23UOFX-07C
F-98

SELF-DIAGNOSIS FUNCTION F
Circuit
MTX
OXYGEN SENSOR
ECU
23UOFX-07
ATX
OXYGEN SENSOR
R/L
-em---- ----- -- ECU
WLG
23UOFX-072
F-99

SELF-DIAGNOSIS FUNCTION
:ODE No. 17 (Oxygen sensor-lnvarsion)
r t
INSPECTION
Check if same Code No. is present after per-
forming after-repair procedure CT- page F-704
Check monitor lamp of Self-Diagnosis Checker il-
luminate at idle after warming-up engine and
running it at 2,500-3,000 rpm
for 3 minutes
Check for correct fuel line pressure at idle CT page F-129
Fuel line pressure;
265-314 kPa (2.7-3.2 kg/cm2, 38-46 psi)
{Vacuum hose to pressure regulator
disconnected)
4 Check injectors for fuel teakage c3 page F-132
5
Disconnect each high-tension lead at idle and
check if engine speed decreases equally at each
cylinder
Circuit Oiagram
MTX
I ACTION
Yes 1 Go to next step NO
Check oxygen sensor circuit for poor
connection
r3 If OK, perform troubleshooting
Code No.15
a
If not OK, repair or replace con-
nector u page F-98
Yes Go to next step Note
l A/F mixture rich
No
I Go to Step 5 Note
l A/F mixture is lean or misfire
occurring
Yes
I Go to next step No High pressure
Check if fuel return hose is ciogged or
restricted
+ If OK, replace pressure regulator CT page F-130
c3 If not OK, repair or replace
Yes Replace injector
No Check if water thermosensor is OK
ti if OK, Go to Step 11
c3 If not OK, replace water thermo-
sensor c7 page F-168
CT page F-168
Yes
Go to next step No
Go to Step 8
23UOFX-07
OXYGEN SENSOR
I
R/L
ECU
----------h--M
23UOFX-074
F-l 00

SELF-DIAGNOSIS FUNCTION F
TEP
6
7
8
9
IO
11 INSPECTION
Check for correct fuel line pressure at idle
IV page F-122
Fuel line pressure:
265-314 kPa (2.7-3.2 kg/cm’, 38-46 psi)
(Vacuum hose to pressure regulator
disconnected)
Check intake air system components for air
leakage
Check for misfire of dead cylinder from Step 5
inspection
Check for injector operating sound at idle of
dead cylinder from Step 5 inspection -
Replace injector at dead cylinder from Step 5 in-
spection
CI page F-131
Check if same Code No. is present following
performing after-repair procedure
CT page F-104
Try known good ECU and check if condition
Improves
CT page F-149 Yes
No
Yes If not clogged, check fuel pump
maximum pressure
Go to Step 11
No Replace
--
Yes Repair or replace ignition system
No
Yes
No
Yes
No
T L ACTION
Go to next step
Low pressure
Check fuel line pressure while pinching
fuel return hose
~3 If fuel line pressure quickly in-
creases, check pressure regulator
v page F-129
c3 If fuel line pressure gradually in-
creases, check for clogging be-
tween fuel pump and pressure
regulator
CT page F-126
Go to next step
Go to next step
Check for battery voltage at injector
connector terminal-wire (W/R)
L3 If Yes, replace injector c7 page F-131
+ If No, check wire harness for short
or open
Go to next step
Removed injector at fault
Circuit Diagram
ATX
OXYGENSENSOR
R/L
ECU
-------------- ---
BILG
23UOFX-07
F-10'

SELF-DIAGNOSIS FUNCTION
:ODE No. 1 25 (SOLENOID VALVE - PRESSUREREGULATORCONTROL)-BPENGINE
r (
TEP
1
-
2
-
3 I
INSPECTION
Disconnect connector from ECU and check if
battery voltage exists at ECU terminal 2T (MTX)
3M (ATX) wire (G/O) with ignition switch ON
In same condition as Step 1, check if battery
voltage exists at solenoid valve connector
terminal-wire (G/O) ACTION
Yes Check ECU terminal connector for poor -
connection
* If OK, replace ECU CT page F-149
+
If not OK, repair or replace connector
No Go to next step
Yes Repair or replace wire (G/O)
No Go to next step
Check if solenoid valve is OK Yes Check for short or open circuit in wiring
w page F-135 from main relay (FUEL INJ relay) to
solenoid valve
No Replace solenoid valve
I I I
23UOFX-077
:ODE No. 26 (SOLENOID VALVE - PURGE CONTROL)
STEP INSPECTION
Disconnect connector from ECU and check if
battery voltage exists at ECU terminal 2X (MTX)
20 (ATX) wire harness (W/L) with ignition switch
ON Yes
No
In same condition as Step 1, check if battery
Yes
voltage exists at solenoid valve connector
terminal-wire (W/L)
No
Check if solenoid valve is OK
Yes
w page F-140
t- No
--
4 ACTION
Check ECU terminal connector for poor
connection
ti If OK, replace ECU c;p page F-149
e
If not OK, repair or replace connector
Go to next step
Repair or replace wire harness (W/L)
Go to next step
Check for short or open circuit in wiring
from main relay (FUEL INJ relay) to
Circuit Diagram
MTX
I-
FROM
BATTERY
FROM
23UOFX-07 9
F-l 02

SELF-DIAGNOSIS FUNCTION F
1
CODE No. 34 (ISC VALVE)
1 ACTION
Yes Check ECU terminal connector for poor
connection INSPECTION
Disconnect connector from ECU and check if
battery voltage exists at ECU terminal 2W (MTX)
3Q (ATX) wire (L/O) with ignition switch ON
c3 If OK, replace ECU
+ If not OK, repair or replace con-
nector w page F-149
No Go to next step
In same condition as Step 1, check if battery
voltage exists at ISC valve connector terminal.
wire (L/O) Yes ) Repair or replace wire (L/O)
No Go to next step
Yes Check for short or open circuit in wiring
from main relay (FUEL INJ relay) to ISC
valve
No Replace ISC valve Check ISC valve for correct resistance
w page F-i 16
Resistance: 1 l-130 [at 20°C(68”F) ]
I 23UOFX-08( I
r C :ODE No. )
41 (SOLENOID VALVE - VICSbDOHC
I
ii
T
I
INSPECTION
ACTION
Check ECU terminal connector for poor
connection
in’
I
* If OK, replace ECU w page F-149
c3 If not OK, repair or replace con-
nector
No Go to next step Disconnect connector from ECU and check if
battery voltage exists at ECU
terminal 2S (MTX)
31 (ATX) wire (B/R) with ignition switch ON
2 In same condition as Step 1, check if battery voltage exists at solenoid valve connector
terminal-wire (B/R)
Check if solenoid valve is OK
w page F-l 18 Yes Repair or replace wire (B/R)
No Go to next step
Yes Check for short or open circuit in wiring
from main relay to solenoid valve
No
Replace solenoid valve
23UOFX-081 3
Circuit Diagram
ATX
ISC VALVE
FROM
BATTERY 4
FROM
L
IGNITION d++n.D,,
SWITCH
MAIN RELAY
(FUEL INJ RELAY) S
4\ ECU
SOLENOID VALVE
i(VICS) [DOHC]
W/R ,,
\
SOLENOID VALVE ,
(PURGE CONTROL)
23UOFX-082
F-i 03

F SELF-DIAGNOSIS FUNCTION
23UOFX-08: 3
03UOFX.086
i:a pj
MONITOR
SELECT El
03UOFX-:6
7
I
7
After-repair Procedure
1. Cancel the memory of malfunctions by disconnecting the
negative battery cable for
at least 20 seconds. Reconnect
the negative battery cable.
2. Connect the
SST (System Selector) to the diagnosis con-
nector.
3. Set the switch @to position 1.
4. Set TEST SW to SELF-TEST.
5. Connect the
SST (Self-Diagnosis Checker) to the System
Selector and a ground.
6. Set the select switch of the Self-Diagnosis Checker to posi-
tion A.
7. Turn the ignition switch ON.
8. Start and warm up the engine, then run it at
2,000 rpm for
three minutes.
9. Verity that no code numbers are displayed.
F-l 04