Mazda MX-5 Miata Sport 2007 Manual page 2049

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
distributor.
Short check connector
terminal F/P to body
GND using a jumper
wiring.
Turn the ignition switch
to the ON position
(Engine off).
Is the fuel line pressure
correct with the ignition
switch at ON?
(See FUEL LINE
PRESSURE
INSPECTION [LF] .)
7 Inspect the spark plug
for the following.
Heat range

Air gap

Is the spark plug
normal?
8 Remove the suspected
fuel injector.
Inspect the following:
Resistance

(See FUEL
INJECTOR
INSPECTION
[LF] .)
Fuel injection

volume
(See FUEL
INJECTOR
INSPECTION
[LF] .)
2007 Mazda MX-5 Miata Sport
No
Yes
No
Yes
Open or short circuit in

injector
Leakage

Injection volume

Zero or low:
Inspect the 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] .)
Go to the next step.
Replace the spark plug.
(See SPARK PLUG
REMOVAL/INSTALLATION
[LF] .)
Inspect for open circuit in
wiring harness between fuel
injector connector terminal B
and PCM at the following
terminals:
For No.1 cylinder: 2BB

For No.2 cylinder: 2BC

For No.3 cylinder: 2BD

For No.4 cylinder: 2AZ
