1992 MAZDA PROTEGE relay

SELF-DIAGNOSIS FUNCTION F
Circuit Diagram
MTX
I
ECU FROM CIRCUIT-
A
p) LhmGb
L”
ZrJ \zVJ / OPENING RELAY
----___--_- -====
_--___------
I 1 IW I I il I I DIAGNOSIS CONNECTOR
WATER
THERMOSENSOR -. BILG I
LG
+/
+ II-
RIB B/BR 1 R LGlR LG I
LIW I
BlLG
I 0
0 4,
9,
I
-- --
_- -- == =z L\. $k
= = 4k $
==
E G C F D A B
+/
BILG
BIBR
L-de
,, BIBR
\ 4,
AIRFLOW METER
23UOFX-05
WATER
-S-“Ce)..r\ECL,Cr\D BILG I
+R
RIB BIER ;
0 BlLG _
4, I
I
I
-1
LG
DIAGNOSIS CONNECTOR
LGlR ”
I=
1
23UOFX-06
F-91

SELF-DIAGNOSIS FUNCTION F
Circuit Diagram
MTX
FROM CIRCUIT-
OPENING RELAY
DIAGNOSIS CONNECTOR
WATER
THERMOSENSOR
f
BlLG I
4 I,
RIB BlBR I R
LGIR LG 1,
BlLG I
I B
0
I
I
= = $k $&
==: -zz $k $h
== = = $& $>
==
E G C F D A B
1 LG
-
AIRFLOW METER
23UOFX.06:
ATX
J
>
I FROM CIRCUIT,;
#wr.r..*..n -s. .
I
ECU
em--------------
- --___ _-------- - - Ut-CNINb titLA
WATER
THERMOSENSOR L/W
I
DIAGNOSIS CONNECTOR
LG
I
1:
RIB BIER ,
0
23UOFX-06:
F-93

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

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 FUEL SYSTEM
FUEL SYSTEM
DESCRIPTION
FUEL FILTER
(HIGH PRESSURE SIDE) . TANK
FUEL PUMP
PRESSURE SIDE)
OWOFX-12
This system supplies the necessary fuel for combustion at a constant pressure to the fuel injectors. Fuel is
metered and injected into the engine intake ports according to injection control signals from the engine con-
trol unit. The system consists of the fuel tank, the fuel pump, the fuel filters, the delivery pipe, the pressure
regulator, the fuel injectors, and the circuit opening relay. ._*
F-l 20

FUEL SYSTEM F
DIAGNOSI&ONNECTOR
03UOFX-138
I I 23UOFX-110
,
DISCONNECT CONNECTOR
REAR SEAT C
23UOFX-11
03UOFX-11

OBUOFX-11
FUEL PUMP
Inspection
Fuel pump operation
1, Connect the diagnosis connector terminals F/P and GND
with a jumper wire.
2. Remove the fuel filler cap.
3. Turn the ignition switch ON.
4. Listen for operational sound of the fuel pump at the filler inlet.
5. Install the fuel filler cap.
6. If no sound was heard, measure the voltage between the
fuel pump connector wire B/P to ground.
Specification: Battery voltage
7. If not correct, check the circuit opening relay and its cir-
cuits (Refer to page F-129.)
8. If the voltage is normal, check for continuity between fuel
pump connector B/P and B.
9. If there is continuity, replace the fuel pump.
IO. If there is no continuity, repair the ground circuit.
Hold pressure
Perform this inspection if the fuel pressure hold inspection is
not as specified. (Refer to page F-121 .)
Warning
l Before performing the following operation, release
the fuel pressure from the fuel system to reduce the
possibility of injury or fire. (Refer to page F-121 .)
1. Disconnect the negative battery terminal.
2. Connect a fuel pressure gauge to the fuel main pipe and
plug the outlet of the fuel pressure gauge as shown. (Install
clamps as shown.)
3. Connect the negative battery terminal.
4. Connect diagnosis connector terminals
F/P and GND with
a jumper wire.
5. Turn the ignition switch ON
for 10 sec. to operate the fuel
w-w.
6. Turn the ignition switch OFF and disconnect the jumper wire.
7. Observe the fuel pressure
after 5 min..
Fuel pressure:
More than 343 kPa (3.5 kg/cm’, 50 psi)
8. If not as specified, replace the fuel pump.
F-l 25

FUEL SYSTEM F
STA
OBUOFX- 15
03UOFX-15
DISCONNECT CONNECTOR
TO RELEASE FUfL PRESSURE
REAR SEAT C
23UOFX-11
INSTALL CLAMPS
CIRCUIT OPENING RELAY
Inspection
Voltage inspection
I, Check voltage between the following terminals and a ground
using a voltmeter.
Ve: Battery voltage
Resistance inspection
1, Check resistance between the terminals using an ohmmeter.
Terminal Resistance (Q)
STA-El 21-43
B-Fc 109-226
B-Fp 00
Replacement
1, Remove the passenger side wall.
2. Disconnect the relay connector.
3. Remove the relay from ECU bracket.
4. Install in the reverse order of removal.
PRESSURE REGULATOR
Inspection
Fuel line pressure
Warning
l Before performing the following operation, release
the fuel pressure from the fuel system to reduce the
possibility of injury or fire. (Refer to page F-121.)
1, Disconnect the negative battery terminal.
2. Connect a fuel pressure gauge between the fuel filter and
the fuel main hose. (Install clamps as shown.)
3. Connect the negative battery terminal.
4. Start the engine and run it at idle.
5. Measure the fuel line pressure.
Fuel line pressure:
206-255 kPa (2.1-2.6 kg/cm2, 30-37 psi)
6. Disconnect the vacuum hose from the pressure regulator
and measure the fuel line pressure.
Fuel line pressure:
265-314 kPa (2.7-3.2 kg/cm2, 36-46 psi)
F-l 29
03UOFX-157