No
Go to the next step.
9
Install the fuel pressure
gauge between the fuel
pipe and fuel
distributor.
Short check connector
terminal F/P to body
GND using a jumper
wiring.
Turn the ignition switch
to the ON position.
Is fuel line pressure
correct with ignition
switch ON?
(See
FUEL LINE
PRESSURE
INSPECTION [LF]
.)
Yes
Go to the next step.
No
Zero or low:
Inspect the fuel pump relay and
the fuel pump circuit. Inspect
the fuel line for clogging.
If there is no malfunction,
replace the fuel pump unit.
(See
FUEL PUMP UNIT
REMOVAL/INSTALLATION
[LF]
.)
High:
Replace the fuel pump unit.
(See
FUEL PUMP UNIT
REMOVAL/INSTALLATION
[LF]
.)
10
Is the fuel line pressure
held after ignition
switch is turned off?
(See
FUEL LINE
PRESSURE
INSPECTION [LF]
.)
Yes
Go to the next step.
No
Inspect the fuel injector.
(See
FUEL INJECTOR
INSPECTION [LF]
.)
If the fuel injector is normal,
replace the fuel pump unit.
(See
FUEL PUMP UNIT
REMOVAL/INSTALLATION
[LF]
.)
11
Disconnect a vacuum
hose from purge
solenoid valve and plug
opening end of vacuum
hose.
Start engine.
Is starting condition
improved?
Yes
Inspect if the purge solenoid
valve is stuck open.
No
Go to the next step.
12
Inspect the MAF sensor
for following:
Contamination
MAF sensor
terminal B
voltage (GND
circuit)
Is there any
contamination?
Yes
Repair or replace the
malfunctioning part.
No
Go to the next step.
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:09 PM
Page 24
© 2005 Mitchell Repair Information Company, LLC.