Mazda MX-5 Miata Sport 2007 Manual page 2017

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
concern present?
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?
5 Inspect fuel-filler cap.
(See FUEL-FILLER
CAP INSPECTION
[LF] .)
Is there any leakage at
fuel-filler cap?
6 Inspect the front HO2S.
(See FRONT
HEATED OXYGEN
SENSOR (HO2S)
INSPECTION [LF] .)
Is front HO2S normal?
7 Perform spark test.
(See SPARK TEST .)
Is strong blue spark
visible at each cylinder?
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] .)
9 Remove and shake the
PCV valve.
Does the PCV valve
2007 Mazda MX-5 Miata Sport
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
troubleshooting.
Go to the next step.
Go to the next step.
Inspect for coolant leakage,
cooling fan and condenser fan
operation or thermostat
operation.
Replace the fuel-filler cap.
Go to the next step.
Go to the next step.
Replace the front HO2S.
(See FRONT HEATED
OXYGEN SENSOR (HO2S)
REMOVAL/INSTALLATION
[LF] .)
Go to the next step.
Repair or replace the
malfunctioning part according to
spark test result.
Go to the next step.
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] .)
Go to the next step.
Replace the PCV valve.