Mazda B-Series 1997 Workshop Manual page 385

FT
TROUBLESHOOTlNG GUIDE
ACTION
Go to next step
Check the EGR valve and EGR vacuum regulator
solenoid
=
page FT-158,159
Install PCV valve
I
Go to next step
,
-
-
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STEP INSPECTION
Yes
No
Yes
-
-
13
14
11 Does EGR valve seat properly?
-
-
12 Remove PCV valve and shake it.
Does PCV valve rattle?
No
.
Replace PCV valve
+
- p - p - p p .
- - - -
-- -
Go to next step
Check
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
-
page FT-160
If no, check for vacuum leak in PCV system, oil
cap, PCV valve, rocker cover for bolt torquetgasket
leak
Go to next step
Zero or low:
Check pressure regulator diaphragm
=
page FT-154
- .
Is fuel line pressure correct?
page --150
Start engine. Disconnect crankcase ventilation hose
the 'lace a stiff piece of paper
over the hose end.
Does vacuum hold the paper?
- -
Perform Fuel Line Pressure Inspection.
7
Yes
No
Yes
Fuel line pressure:
15
16
17
18
MF1746-C2
FT-40
240-280 kPa (2.5-2.8 kgf/cm2, 35-40 psi)
Check fuel pump circuit
=
page FT-151
High:
Check pressure regulator for high pressure cause
w
page FT-154
Check for clogged fuel return line
Go to next step
Check pressure regulator diaphragm
=
page FT-154
If condition is OK, check injector
=
page FT-155
If condition is not OK, replace pressure regulator
i
Visually look for fuel leakage at injector O-ring,
pressure regulator, and fuel line. Service as
necessary, Per-form Fuel Pressure Hold Inspection
GF
page FT-150
Does fuel line pressure hold?
Yes
Disconnect inertia fuel shutoff switch connector. Yes
!
Go to next step
Crank engine for 5 seconds. Does pressure drop
Check resistance of injectors at PCM connector
If resistance is OK, check as follows:
Injector drive signal
Injector flow rate
PCM
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
19
if symptom occurs
during AIC on
For 3.OU4.OL: If OK, go to step 19
Check as follows:
High tension leads
=
Section G
Crankshaft position sensor
=
Section G
Camshaft position sensor
page FT-168,174,180
- -
.
-
-
- -
Replace power steering pressure switch
-
- -
-
-
Check for short circuit in wiring harness from power
steering pressure switch to
PCM
- -
more than 34 kPa {0.35 kgflcm2, psi) by the end
NO
of 5 second crank cycle?
i
Is strong blue spark visible at each disconnected
high-tension lead while cranking engine?
Yes
No
- - - -
.~
Do RPM increase with power steering pressure
switch disconnected?
Yes
-
-~
No