1992 MAZDA PROTEGE Workshop Manual

SELF-DIAGNOSIS FUNCTlON F
I
ECU
Ne-SIGNAL
Circuit Diagram
MTX
30A MAIN RELAY
Cl IEl Ihl I ra)El A”
B/W ,, ,, B/w ,, m/W ,/ +,J@ , ““l”
\ IF \ ,,
ff W Y/L
II f
II II $4
BlLG
WIG I ___ --- -i-
((
I*
- & W/R
B
t B.
DISTRIBUTOR
ATX
r
ECU
Ne-SIGNAL
MAIN RELAY .
w-w
(FUEL INJ RELAY) w-w
WIR
23UOFX-O!
F-87

F SELF-DIAGNOSIS FUNCTION
r C :ODE No.
03 (DISTRIBUTOR G-SIGNAL) - DOHC ¶
El
i- I
INSPECTION
Check distributor circuit for poor connection ACTION
Yes Repair or replace connector
1
2
-s-
-T-
--c
--if-
7
-ii- No
I I Go to next step
Check if Code No.02 is also present Yes
I I Go to next step
Check terminal-wire for continuity No Go to Step 5
Yes Go to next step
Check if battery voltage exists at distributor
terminal-wire No Repair of replace
Yes Go to next step
No
I I
Check for open circuit in wiring from
distributor to main relay
Check terminal-wire between distributor and
Yes Go to next step
ECU terminal 2G (MTX) 2J (ATX) for continuity
and ground
No Repair or replace
Ct$; if$CU terminal 2G (MTX) 2J (ATX) volt- Yes Replace ECU r=+ page
F-149 CT page
F-154 No
Go to next step
Check if OV or 4.5V--53 exists at distributor Yes
I I Replace distributor
terminal-wire
No
I I Go to next step
I Check if 4.5V--5.5V exists at ECU terminal 2G
(MTX) 2J (ATX) (With distributor connector dis-
connected) Yes Check for short circuit in wiring from
distributor to ECU
No Replace ECU CT page
F-149
I I 23UOFX-0: i5
F-88

SELF-DIAGNOSIS FUNCTION F
I ECU
Circuit Diagram
MTX
1
G-SIGNAL
30A
MAIN RELAY
(FUEL INJ RELAY)
BIW ,, ,, lBiW ,, BIVJ,,
W/R
\ // 1,
Y/L
WIG --- s-v ---
--w v-s
SlLG
IL--;) I/ 4
DISTRIBUTOR
23UOFX-05
ATX
ECU
G-SIGNAL
MAIN RELAY
(FUEL INJ RELAY)
WIG
WIR
DISTRISUTOR
F-89

SELF-DIAGNOSIS FUNCTION
:ODE No. 08 (AIRFLOW METER)
TEP INSPECTION ACTION
1 Check airflow meter circuit for poor connection Yes Repair or replace connector
No Go to next step
2 Check if Code No.10 is also present Yes Check for open circuit in wiring from
airflow meter terminal-wire (BILG) to
ground
Go to next step
3 Check if resistance of airflow meter is OK
4 Check wire harness between airflow meter and
Repair or replace wire harness
5 Check if ECU terminals voltages are OK Yes Replace ECU CT= page
F-149
MTX...2D, 2K and 20
ATX... 2B, 21 and 3D a page
F-152 No Check for short circuit in wiring from
airflow meter to ECU
23UOFX-058 .-
.- ,
F-90

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
:ODE No. 09 (WATER THERMOSENSOR)
iTEP INSPECTION ACTION
1 Check water thermosensor circuit for poor con-
Yes Repair or replace connector
nection
3 Check if resistance of water thermosensor is OK Yes Go to next step
Coolant temp. Resistance (kg)
No Replace water thermosensor
-20% ( -4OF) 14.6-17.8
2o”c ( 68OF) 2.21-2.69
80% (176OF) 0.29-0.35
4 Check if same Code No. is present following Yes Go to next step
after-repair procedure
w page F-104 No
Water thermosensor and circuit OK
5 Check if ECU terminals voltages are OK
Yes Replace ECU w page F-149
MTX...2D and 20
ATX...2E and 3D
w page F-152 No Check for short circuit in wiring from
water thermosensor to ECU
-- ._-..__
23Uu~X-ut
4
-’
F-92

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

F SELF-DIAGNOSIS FUNCTION
:ODE No.
10 (INTAKE AIR THERMOSENSOR - IN AIRFLOW METER)
TEP INSPECTION
ACTION
1 Check intake air thermosensor circuit for poor
Yes Repair or replace connector
connection
No Go to next step
2 Check if Code No.08 is also present
Yes Check for open circuit in wiring from
airflow meter terminal wires (BILG) and
(B/BR) to ground
Go to next step
3 Check wire harness between intake air
thermosensor and ECU for continuity
4 Check if resistance of airflow meter between
Yes Go to next step
terminals C (BIBR) and G (R/B) is OK
r
Temperature ~ No
Resistance (kg) Replace airflow meter
-20% 13.6-18.4
20% 2.21-2.69
60% 0.493-0.667
5 Check if same Code No. is present following
Yes Go to next step
after-repair procedure
CT page F-104 No
Intake air thermosensor and circuit OK
6 Check if ECU terminals voltages are OK Yes Replace ECU IT- page F-149
MTX...2D and 2P
ATX... 2K and 3D
CT page F-152 No Check for short circuit in wiring from
intake air thermosensor to ECU
23UOFX-06 -
F-94