Collapsed or
restricted
intake-air
system
Restricted fuel
return line
Are all items normal?
No
Service if necessary.
Repeat Step 4.
5
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.
6
Install the fuel
pressure gauge
between the fuel pipe
and the fuel
distributor.
Start the engine and
idle it.
Measure fuel line
pressure during idle.
Is fuel line pressure
correct during idle?
(See
FUEL LINE
PRESSURE
INSPECTION
[LF]
.)
Yes
Go to the next step.
No
Low:
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]
.)
7
Perform the spark test.
(See
SPARK TEST
.)
Is strong blue spark
visible at each
cylinder?
Yes
Inspect the CMP sensor.
(See
CAMSHAFT POSITION
(CMP) SENSOR INSPECTION
[LF]
.)
No
Repair or replace the malfunctioning
part according to spark test result.
8
Verify test results.
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:10 PM
Page 94
© 2005 Mitchell Repair Information Company, LLC.
