Mazda MX-6 1998, Руководство по ремонту

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TROUBLESHOOTING [ENGINE CONTROL KL]
STEP
INSPECTION
ACTION
6
CHECK CATALYST MONITOR OPERATION
• Key off.
• NGS tester connected.
• Key on, engine on.
• Select PID/DATA MONITOR AND
RECORD and monitor 02S 12 and 02S 13
PID.
• Drive vehicle for approximately 10 min. at
64— 96 km/h {40— 60 MPH}.
• Allow vehicle to idle in Neutral or Park.
• Maintain idle engine speed.
• Record PID/DATA and count inversion
times of 0 2 S 1 2 and 02S13.
• Calculate devide 02S 12 by 02S13.
•
Is ratio of 0 2 S 1 2 and 0 2 S 1 3 greater
than 2.0?
Yes REPLACE PCM.
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No REPEAT step.
If ratio of 02S 12 and 02S 13 is below 2.0 after three
attempts, go to next step.
7 CHECK FUEL PRESSURE
Note
• Fuel pressures above specification may
produce an abnormally rich air/fuel mixture.
Rich air/fuel mixture may cause higher than
normal catalyst operating temperatures.
• Key off.
• Inspection vacuum hose going to fuel
pressure regulator for proper installation,
cracks, etc. Service as necessary.
• Install fuel pressure gauge.
• Verify vacuum source to fuel pressure
regulator.
• Start and run engine at idle. Record fuel
pressure.
• Increase engine speed to 2,500 rpm and
maintain for one minute. Record fuel
pressure.
• Is fuel pressure between 210 — 310 kPa
{2.2 — 3.1 kgf/cm2, 31 — 46 psi>?
Yes Fuel pressure Is okay.
REMOVE fuel pressure gauge.
Go to next step.
No
Fuel pressure is out of specification.
Inspect Fuel Delivery System.
i
t
0 1 -1 4 FUEL INJECTOR INSPECTION, Fuel
Leakage Inspection
RESET PCM to completely clear DTCs.
ay After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
8 CHECK FOR OBVIOUS LEAK SOURCES IN
EXHAUST SYSTEM
Note
• If catalyst in series with leaking exhaust
system, it can cause Catalyst Efficiency
Monitor Test to fail.
• Key off.
• Inspect following for leaks, cracks, loose
connections or punctures:
• Exhaust manifold
• Front exhaust pipe
• Rear exhaust pipe
• Silencer/tail pipe component
• Are above components free of cracks
and punctures, etc.?
Yes CHECK that exhaust manifold to catalyst Inlet pipe joint is
tight.
Go to next step.
No
REPLACE/SERVICE leak source(s).
RESET PCM to completely clear DTCs.
o - After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
9 CHECK FOR OBVIOUS RESTRICTIONS IN
EXHAUST SYSTEM
• Inspect following for dents, areas of
collapsed material and unusual bending:
• Front exhaust pipe
• Rear exhaust pipe
• Silencer/tail pipe component
• Are above components free of dents
and areas of collapsed material or
unusual bending, etc.?
Yes Go to next step.
No REPLACE/SERVICE restricted component(s) as
necessary.
RESET PCM to completely clear DTCs.
tr After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
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