Mazda 323 Workshop Manual Supplement page 157

F2
TROUBLESHOUTING GUIDE
I
22
KNOCKtNG [8P TURBO]
I
IESCW-
l
Abnormal combustron accompanied by audible "pinging" noise
rim
TROUBLESHOOTING HtNTS]
3 incorrect ignition timing (Too advanced)
@ Low octan fuel used
2
Knock control
system malfunction
@ Air/Fuel mixture lean
3 Carbon deposits in cylinder
l
Fuel injection amount not
correct
3 Overheating
l
Fuel line pressure decreases while accelerating
TEP
INSPECTION
ACTlON
1
Connect System Selector to diagnosis connector
Yes Go to next step
and set Test Switch to "SELF TEST" and check
for correct ignition timing at idle after
warm-up'
ignition timing: BTDC 10 f lo
No
Adjust
2 Check if "00" is displayed on Self-Diagnosis Yes Go to next step
Checker with igmtlon switch UN*
No
Matf unction Code No. displayed
Check for cause (Refer to specified
check sequence) *
"88" flashes
Check ECU terminal 1 F voltage
Vottage: Approx. 12V
(Ignition switch ON)
0 page FZ-60
4 If OK, replace ECU
W: SELF
TEST
4 If not OK, check wiring between
ECU and Self-Diagnosis Checker
3 Check for correct fuel line pressure at idle* Yes Check if fuel Iine pressure decreases
when accelerating quickly
Fuel line pressure:
265-314 kPa (2.7-3.2 kg/cm2, 38-46 psi)
(vacuum hose to pressure regulator dis-
connected)
4 If decreases, check for clogging
between fuel pump and pressure
regulator
e If no decrease, go to next step
No tow pressure
Check
fuel line pressure while pinching
fuel return hose
3 If fuel line pressure quickly in-
creases,
check pressure
regulator*
4 If fuel line pressure gradually in-
creases, check for clogging be-
tween fuel
pump and
pressure
regutator
If not clogged, check fuel pump
maximum pressure*
- -
.-
Refer to 323 Workshop Manual [1203-IO-89f (Europe} or t204-IO-89f (Australia)].
F2-40