Mazda 323 Workshop Manual Supplement page 149

F2
TROUBLESt=iUUTlNG GUIDE
SYMPTOM TROUBLESHOOTING
Regarding symptom troubleshooting
except
LACK OF
POWER, POOR XCELERATION, KNOCKING, and
HIGH UIL CONSUMPTION, refer to Workshop Manual [I 203-l O-89F (Europe) or 1204-l O-89F (Australia)].
19 LACK OF POWER [BP TIJR801
DESCRIP-
*Performance poor under load when throttle valve wide open
TION
*Reduced maximum speed
l
Idle condition normal
[TROUBLESHOOTING HINTS1
3 Wastegate always open or opens early
3 Turbocharger damage
@ Factors other than engine malfunction
*Clutch sllpping
l
Brake dragging
*Low tire pressure
l
Incorrect tire size
l
Overloaded vehicle
@ Low intake air amount
*Throttle valve not open fully
*Clogged intake air system
TEP INSPECTlON
1
Install pressure gauge in intake air pipe and
check boost pressure at engine speed of
4,000
wm
CT page F2-45
Boost pressure:
More than 2.0 kPa (0.02 kglcm2, 0.3
psi)
@ Air/Fuel mixture lean
l
Fuel iine pressure decreases
l
Fuel injection malfunction
@ Poor ignrtjon
@ Low engine compression
@ Alcohol blended fuel used
@ Knock control system malfunction
ACTION
Yes
Go to Step 3
NO
Check for air leakage and exhaust gas
leakage
4 If OK, go to next step
4 In not OK, repair
2 Check wastegate
Yes Remove intake air pipe from turbo-
f7 page F2-45 charger and check if compressor wheel
rotates smoothly t7 page F2-46
4 If OK, check air cleaner element
and throttle valve
+ If not OK, replace turbocharger
3 Check factors other than engrne Yes
l
Clutch slipping
Go to next step
1 8rake dragging
'
l
Low tire pressure
NO
Repair or adjust
l
Incorrect tire srze
FZ-32