Mazda MX-6 1998, Руководство по ремонту

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TROUBLESHOOTING [ENGINE CONTROL FS]
STEP INSPECTION
ACTION
8 Remove PCV valve and check PCV valve.
Does PCV valve rattle? Yes Go to next step.
No
Replace PCV valve.
9 Install fuel gauge between fuel filter and fuel
distribution pipe. Connect NGS tester to DCL.
In OUTPUT TEST MODE select “ALL ON”
and press start.
Is fuel line pressure correct with ignition switch
ON?
Fuel line pressure
260— 310 kPa
{2.6— 3.2 kgf/cm2, 37—46 psi}
Yes
Go to next step.
No Zero or low:
Check fuel pump circuit.
Check for open fuel pump relief valve.
Check for fuel leak inside pressure regulator.
Check for clogged main fuel line.
H igh:
Check pressure regulator for high pressure cause.
Check for clogged fuel return line.
1 0
Is fuel line pressure held after ignition switch is
turned off?
Fuel line pressure
More than 150 kPa
{1.5 kgf/cm2, 21 psi}
Yes Go to next step.
No Check pressure regulator diaphragm condition.
If condition is okay, check fuel injector.
If condition is not okay, replace pressure regulator.
11 Disconnect vacuum hose from pressure
regulator and plug hose.
Start engine.
Does fuel line pressure remain within ± 20
kPa {0.21 kgf/cm2, 3 psi} while driving
vehicle?
Yes
Go to next step.
No Check for clogged fuel filter.
12
Connect vacuum hose to pressure regulator.
Install vacuum gauge to intake manifold.
Start the engine.
Does fuel pressure gauge reading increase as
vacuum gauge reading decreases and/or
does fuel pressure gauge reading decreases
as vacuum gauge reading increases?
Yes Go to next step.
No
Connect vacuum pump to pressure regulator. Start engine
and check that fuel pressure reading changed as vacuum
changes.
If changes, check vacuum line.
If no change, replace pressure regulator.
13 Disconnect a vacuum hose from purge
solenoid valve and plug opening end of
vacuum hose.
Attempt to start engine.
Is starting condition improved?
Yes Check if purge solenoid valve sticks to open.
No Go to next step.
14 Check for contaminated mass air flow sensor.
Is there any contamination?
Yes
Replace mass airflow sensor.
No Go to next step.
15 Is there restriction in exhaust system? Yes Check exhaust system.
No Go to next step.
16 Check the engine condition while tapping the
EGR valve housing. Does engine condition
improve? Yes Replace EGR valve.
No Go to next step.
17
Check starting system.
cr 0 1 -1 9 STARTER INSPECTION
Is starting system normal?
Yes Check for the loosen connectors or poor terminal contact.
If okay, remove the EGR valve and visually check for
mechanically stuck EGR valve.
No Check continuity of stepping motor coil. If okay, go to next
step.
18 Verify test results. If okay, return to diagnostic index to service any additional symptoms.
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