concern present?
troubleshooting.
No
Go to the next step.
4
Connect the M-MDS or
equivalent to the DLC-
2.
Access ECT PID.
Warm up the engine
and idle it.
Verify ECT PID is
correct.
(See
PCM
INSPECTION [LF]
.)
Is ECT PID correct?
Yes
Go to the next step.
No
Inspect for coolant leakage,
cooling fan and condenser fan
operation or thermostat
operation.
5
Inspect fuel-filler cap.
(See
FUEL-FILLER
CAP INSPECTION
[LF]
.)
Is there any leakage at
fuel-filler cap?
Yes
Replace the fuel-filler cap.
No
Go to the next step.
6
Inspect the front HO2S.
(See
FRONT
HEATED OXYGEN
SENSOR (HO2S)
INSPECTION [LF]
.)
Is front HO2S normal?
Yes
Go to the next step.
No
Replace the front HO2S.
(See
FRONT HEATED
OXYGEN SENSOR (HO2S)
REMOVAL/INSTALLATION
[LF]
.)
7
Perform spark test.
(See
SPARK TEST
.)
Is strong blue spark
visible at each cylinder?
Yes
Go to the next step.
No
Repair or replace the
malfunctioning part according to
spark test result.
8
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]
.)
9
Remove and shake the
PCV valve.
Does the PCV valve
Yes
Go to the next step.
No
Replace the PCV valve.
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:10 PM
Page 84
© 2005 Mitchell Repair Information Company, LLC.