Mazda 121 - Page 231

SELF-DIAGNOSIS
FUNCTION
F
mDE No.
.I7
(FEEOBACK
SYSTEi|)
STEP I SPECTTON
ACTtOl{
ls
s3me Code No,
present
after
pedorming
aller-
E
7
eagc
F--67
NO Check oxygen
sensor circuit ior
poor
+
li OK,
p€rfom
toLrbleshooling
Code No.15
s
Page
F-74
.)
lf not OK, repair or replace con-
Check monhor
lamp ol Sef-Diaqnosis Checker
il
luminate
at
jdle
alter warming.up engine and
running it at 2,500-3,000 rpm lor
I
minutes?
Go 1o nod step
ilole
.
A/F mixtui€ lB rich
Go to Slep 5
Nole
.
A./F mlrtur! b le.n
or mi8fire occuiing
3 ls tuel line
pressurc
at idle correc0
e
prge
F-94
Fuel llne
Dr€65ure:
235-275
wa
(2.1-2.A
r.glcnf,
3,F40
p5l)
(Vacuum
ho3. lo
preasurc
rcgulrlot
dbconncctcr0
Go to
next slep
Hlgh
prossuro
ls fuel relurn ho€e clogged
or restricted?
+t
ll OK. replace
pres$re
regulalor
-
pag€
ru4
+
lf nol OK, rcpair or replace
hose
ls
lhere leak€ge ot
fuel
jnjectot
c?
page
F-97
NO
ls waler lhemossnsor OK?
c?
pege
F-121
+
ll OK, Go lo Step
7
+
ll not OK, replace water
lhermc
(z
page
F-121
5 Disconn€ct each high-iension lesd at idle; does
engane speed
decrease
equally at each cyinde|?
NO Go to St€p I
Clrcult Dlagram
F-75