Mazda 121 Workshop Manual 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
N O
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|?
N O
Go to St€p I
Clrcult Dlagram
F-75