Mazda 121 - Knocking

TROUBLESHOOTING GUIDE
F
22 KN(rcKNG
DEsilcBlP.
|
.Aolormar
combust,on accompalred by audrble
prnsins
no|se
TIROUALESHOOTTNG
H|NTSI
O
Incor€ct ignilion liming
floo
advanced)
@
Carbon deposlts
in
cylinder
@
overhealing
@
Ai/Fue mi(ure too
lean
.Fuel
injecton amount not correct
.Fuel
line
pressure
decfeases
trhile
acceleraling
litsPEcTtoN
ACTION
1
Connecl Syslem Selector to diagnosis connector
and
set
Tesl
Swilch to
"SELF
TEST
'
ls ignilion liming
correct at
idle
after wa.rn'up?
E?
page
F-62
lgnilion liming: BTDC 16
+
1'
INDICATOF
2 ls
'00"
d splayed on Self'Diagnosis Ch€cker
with ign'tion switch ON?
c:r
page
F-67
No llaltunctlon Code
ilo. displayed
Check lor cause
(Beler
io specilied
check
seqlence)
c7
page
F-70
"88"
flashes
Check
ECU termlnal 1F vollage
F
page
F-114
volrage: Approx. 12V
(lgnition
swirch ON)
+
lf OK, replace ECU
(?
page
F-112
+
ll not OK. check
wking between
ECU and S€ f-Diagnosis
Checksr
3
ls there
air
leakage
ol
intake
air system com
ls engine compression correcp
e
page
A-10
Englne compression
(Mlnhum):
1,030
kPa
(10.5
kg/cm',
t4s
psiF30o
rpm
tligh compr$sion
Check
eng ne condition
c7
page
B-10
F-55