Mazda B-Series 1997 Workshop Manual page 389

FT
TROUBLESHOOTlNG GUIDE
INSPECTION ACTION
Fuel Line Pressure Inspection.
Is fuel line pressure correct?
Check pressure regulator diaphragm
Fuel line pressure:
. g
page FT-154
240-280 kPa (2.5-2.8 kgf/cm2, 35-40 psi)
Check fuel pump circuit
@
page FT-151
-
Yes Install PCV valve
Does PCV valve rattle7 Go to next step
L A +
No Replace PCV valve
-
_
-
I
1
yig&eck pressure regulator for hlgh pressure cause
. g
page FT-154
-
Check for clogged fuel return llne
-
Vlsually look for fuel leakage at Injector 0-r~ng, Yes Go to next step
Start engine. Disconnect crankcase ventilation hose
from the throttle body. Place a stiff piece of paper
over the hose end.
Does vacuum hold the paper?
Disconnect inertia fuel shutoff switch connector. Yes
Check pressure regulator diaphragm condltlon
=
page FT-154
If cond~tlon
IS
OK, check ~njector
=
page FT-155
If condltlon
IS
not OK, replace pressure requlator
pressure regulator, and fuel llne Service as
necessary.
Perform Fuel Pressure Hold Inspection.
@
page FT-150
Does fuel l~ne pressure hold?
Crank engine for 5 seconds. Does pressure drop
more than 34 kPa (0.35 kgflcm2, 5 psi) by the end
of 5 second crank cycle?
No
-
-
Is strong blue spark visible at each disconnected
high-tension lead while cranking engine?
Does EGR valve seat properly?
Go to next step
~~~~~
- - -
- -
Check evaporative emission system as follows:
Disconnect evaporative hose and place a stiff piece
of paper over hose
Does vacuum hold paper?
If yes, check evaporative emission system
~3
page FT-160
If no, check for vacuum leak in PCV system, oil
cap, PCV valve, rocker cover for bolt torquelgasket
leak
Go to next steD
-
Yes
--
I
No
If resistance is OK, check as follows:
Injector drive signal
Injector flow rate
PCM
I
If resistance is not OK, check for open in injector
circuit
Check spark plugs
@
Section G
For 2.3L: If OK, go to next step if symptom occurs
during parking maneuvers
If OK, go to step 12 if symptom occurs
during AIC on
For 3.OU4.OL: If OK, go to step 12
I
Check as follows:
Camshaft position sensor
=
page FT-168,174,180
High-tension leads
Section G
Crankshaft position sensor
I
Yes !Go to next step
solenoid
=
page FT-158,159