Mazda MX-5 Miata Sport 2007 Manual page 1985

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
condition.
Is the spark plug wet,
covered with carbon or
grayish white?
11 Perform the electronic
throttle control system
operation inspection.
(See ELECTRONIC
THROTTLE
CONTROL SYSTEM
INSPECTION .)
Does the electronic
throttle control system
function properly?
12 Install fuel pressure
gauge between fuel pipe
and fuel distributor.
Start the engine and run
it at idle.
Measure fuel line
pressure during idle.
Is fuel line pressure
correct during idle?
(See FUEL LINE
PRESSURE
INSPECTION [LF] .)
13 Visually inspect for fuel
leakage at fuel injector,
O-ring, and fuel line.
Service if necessary.
Does fuel line pressure
hold after ignition
switch is turned off?
(See FUEL LINE
PRESSURE
INSPECTION [LF] .)
14 Connect the M-MDS or
equivalent to the DLC-
2.
2007 Mazda MX-5 Miata Sport
No
Yes
No
Yes
No
Yes
No
Yes
No
with carbon:
Inspect for fuel leakage from
injector.
Spark plug is grayish white:
Inspect the fuel injector for
clogging.
Install the spark plugs on
original cylinders.
Go to the next step.
Go to the next step.
Repair or replace the
malfunctioning part according to
electronic throttle control
system operation inspection
results.
Go to the next step.
Low:
Inspect the fuel line for
clogging.
If there is no malfunction,
replace 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.
Inspect fuel injector.
If fuel injector is normal, replace
fuel pump unit.
Go to the next step.
LONG FT1 PID is out of
specification.