Mazda MX-6 1998, Руководство по ремонту

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TROUBLESHOOTING [ENGINE CONTROL KL]
STEP INSPECTION
ACTION
19
Measure gap between crankshaft position
(CKP) sensor and teeth of crankshaft pulley.
Specification
0.5— 1.5 mm {0.02— 0.05 in}
Is gap within specifications?
Yes Go to next step.
No Adjust CKP sensor.
20 Check for cracks on high tension leads.
Is there any crack on high tension leads?
Yes Repair suspected high tension lead.
No Go to next step.
21 Is strong blue spark visible at each
disconnected high-tension lead while cranking
engine?
Yes Go to next step.
If symptom occurs with A/C on, go to step 27.
No Check following:
• Open or short circuit in ignition coil.
• High-tension lead(s).
• Open or short circuit in wire harness for ignition system.
• Malfunction of external condenser for eliminating
ignition noise.
• Open circuit between ignition switch and ignition coil.
• Open circuit between ignition coil and PCM.
22 Check spark plug conditions.
Is spark plug wet, converted with carbon or
grayish white?
Yes If spark plug is wet or converted with carbon, check for
fuel leak from fuel injector.
If spark plug is grayish white, check clogged for fuel
injector.
No Install spark plugs on original cylinders.
Go to next step.
23 Remove PCV valve and shake PCV valve.
Does PCV valve rattle? Yes Go to next step.
No
Replace PCV valve.
24 Is there restriction in exhaust system?
Is there any restriction?
Yes Check exhaust system.
No Go to next step.
25 Install fuel gauge between fuel filter and fuel
distributor. Connect NGS tester to DLC.
In OUTPUT TEST MODE, select “ALL ON"
and press start.
Is fuel line pressure correct with ignition switch
ON?
Fuel line pressure
260— 310kP a
{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.
High:
Check pressure regulator for high pressure cause.
Check for clogged fuel return line.
26 Visually check for fuel leakage at fuel injector
O-ring, pressure regulator, 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 minutes
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.
27 Note
• Following test is for stall concerns with A/C
on. If other symptom exists, 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. Are pressure within
specifications?
c r 0 7 -1 0 REFRIGERANT PRESSURE
CHECK
Yes Go to next step.
No Check follows:
• Refrigerant charging amount.
• A/C pressure switches.
• Additional fan operation.
• A/C relay.
28 Disconnect vacuum hose between purge
solenoid valve and intake manifold from purge
solenoid valve side. Plug opening end of
vacuum hose.
Start engine.
Is engine stall now eliminated?
Yes Check if purge solenoid valve sticks to open.
Check evaporative emission control system.
No Go to next step.
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