Mazda MX-6 1998, Workshop Manual

Page: 105 / 1282

TROUBLESHOOTING [ENGINE CONTROL FS]
STEP
INSPECTION ACTION
16 INSPECTION OF VACUUM HOSES
• Key off.
• Pull slightly on vacuum hoses at pressure
control valve, FTP sensor, fuel filler pipe
and fuel tank.
• Check for loose connections.
• Visually inspect for improperly connections
and cracked hoses between fuel tank and
FTP sensor, fuel tank and pressure control
valve, fuel filler pipe and pressure control
valve and pressure control valve and
charcoal canister.
• Confirm air tightness of vacuum hose using
vacuum pump.
• Is fault detected?
Yes SERVICE or REPLACE as necessary.
RECONNECT all components.
RESET PCM to completely clear DTCs.
j y After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No
RECONNECT all components.
Go to next step.
17 CHECK FOR PRESSURE CONTROL VALVE
• Remove and inspect pressure control
valve.
• Is fault detected?
Yes REPLACE pressure control valve.
RECONNECT all components.
RESET PCM to completely clear DTCs.
c r After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No RECONNECT all components.
Go to next step.
18 INSPECTION FUEL FILLER PIPE
• Remove fuel filler pipe.
• Visually inspect for fuel filler pipe damage.
•
Is fault detected?
Yes REPLACE fuel filler pipe.
RECONNECT all components.
RESET PCM to completely clear DTCs.
¡y After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No
RECONNECT all components.
Go to next step.
19 INSPECTION OF FUEL TANK
• Remove fuel tank.
• Visually inspect for fuel tank damage.
• Visually inspect for insufficient sealing or
poorly attached accessories on fuel tank:
i.e., fuel gauge.
•
Is fault detected?
Yes
SERVICE or REPLACE fuel tank or sealing.
RECONNECT all components.
RESET PCM to completely clear DTCs.
e
t
After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No RECONNECT all components.
Go to next step.
20 CHECK FOR EVAPORATIVE EMISSION
MONITOR SYSTEM
• Key off.
• Disconnect vacuum hose from charcoal
canister at fuel tank side.
• Attach the vacuum pump to vacuum hose.
• Connect NGS tester.
• Key on, engine off.
• Access FTP V PID.
• Apply 17 kPa {13 mmHg, 0.5 inHg} vacuum
by using vacuum pump, then leave it for
one minute.
• Does FTP V PID value maintained
negative pressure?
Yes DISCONNECT NGS tester.
Go to step 25.
No DISCONNECT NGS tester.
Go to next step.
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