Mazda 626 Station Wagon, Руководство по ремонту

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TROUBLESHOOTING
STEP INSPECTION RESULTS ACTION
24 Install fuel pressure gauge between fuel main
pipe and fuel distributor.
Connect jumper wire between F/P terminal at
DLC in engine compartment and GND.
Turn ignition switch on.
Is fuel line pressure correct with ignition switch
on?
Fuel line pressure
210—260 kPa {2.1—2.6 kgf/cm2, 30—36 psi}
Yes Go to next step.
No Zero or low:
Inspect fuel pump unit circuit.
Inspect for open fuel pump body relief valve.
Inspect for fuel leakage inside pressure
regulator.
Inspect for clogged main fuel line.
Inspect PRC solenoid, related vacuum hose and
related harnesses.
High:
Inspect pressure regulator for high pressure
cause.
Inspect for clogged fuel return line.
25 Visually inspect for fuel leakage at fuel injector
O-ring and fuel line. Service as necessary.
Does fuel line pressure hold after ignition switch
is turned off?
Fuel line pressure
More than 150 kPa {1.5 kgf/cm2, 21 psi} for 5
min.
Yes
Go to next step.
No
Inspect pressure regulator diaphragm condition.
If condition is okay, inspect fuel injector.
If condition is not okay, replace pressure
regulator.
26 Note:
• The following test is for stall concerns with
A/C on. If other symptoms exist, go to next
step.
Connect pressure gauges to A/C low and high
pressure side lines.
Turn A/C on and measure low side and high
side pressure.
(See Section U)
Are pressures within specifications?
Yes Go to next step.
No If A/C is always on, go to symptom
troubleshooting No.23 “A/C is always ON or A/C
compressor runs continuously”.
For other symptoms, inspect following:
• Refrigerant charging amount
• Condenser fan operation
27 Disconnect vacuum hose between purge
solenoid valve and intake manifold from purge
solenoid side. Plug opening end of vacuum
hose. Start engine.
Is engine stall now eliminated?
Yes Inspect if purge solenoid valve is stuck open.
Inspect evaporative emission control system.
No Go to next step.
28 Is air leakage felt or heard at intake-air system
components while racing engine to higher
speed?
Yes Repair or replace.
No Go to next step.
29 Check engine condition while tapping EGR
valve housing. Does engine condition improve? Yes Replace EGR valve.
No Go to next step.
30 Is engine compression correct? Yes Inspect valve timing.
No Inspect for cause.
31 Verify test results. If okay, return to diagnostic index to service any additional symptoms.
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