Are all items normal?
3
Connect the M-MDS or
equivalent to the DLC-
2.
Turn the ignition switch
to the ON position
(Engine off).
Retrieve any DTCs.
Are there any DTCs
displayed?
Yes
DTC is displayed:
Go to the appropriate DTC
inspection.
(See
DTC TABLE [LF]
.)
No
No DTC is displayed:
Go to the next step.
4
Install the fuel pressure
gauge between the fuel
pipe and the fuel
distributor.
Start engine and idle it.
Is fuel line pressure
correct at idle?
(See
FUEL LINE
PRESSURE
INSPECTION [LF]
.)
Yes
Go to the next step.
No
Low:
Inspect fuel pump relay and 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]
.)
5
Inspect the charcoal
canister for fuel
saturation.
Is excess amount of
liquid fuel present in
canister?
Yes
Replace the charcoal canister.
No
Inspect the fuel tank vent
system.
If the fuel tank vent system is
normal, suggest trying a
different brand since sulphur
content can vary in different
fuels.
If the fuel tank vent system is
not normal, repair or replace the
malfunctioning part.
6
Verify test results.
If normal, return to diagnostic index to service any additional
symptoms.
(See
ENGINE SYMPTOM TROUBLESHOOTING [LF]
.)
If malfunction remains, inspect related Service Bulletins and/or On-
line Repair Information and perform repair or diagnosis.
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:11 PM
Page 108
© 2005 Mitchell Repair Information Company, LLC.