intake manifold
and components
attached to intake
manifold: EGR
valve
Ignition wiring
Electrical
connections
Fuses
Smooth operation
of throttle valve
PCM GND
circuit (1AZ,
1BB, 1BD, 1BH)
Are all items normal?
3
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.
4
Is the engine
overheating?
Yes
Go to symptom troubleshooting
NO.17 COOLING SYSTEM
CONCERNS-
OVERHEATING [LF]
.
No
Go to the next step.
5
Connect the M-MDS or
equivalent to the DLC-
2.
Access MAF PID.
Drive vehicle with
monitoring PID. Is
MAF PID within
specification?
Yes
Go to the next step.
No
Inspect for open or short circuit
of MAF sensor and related
wiring harness.
6
NOTE:
The following
test is for
engine running
at rough idle
with A/C on. If
Yes
Go to the next step.
No
If the A/C is always on, go to
symptom troubleshooting
NO.24 A/C IS ALWAYS ON
OR A/C COMPRESSOR
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:09 PM
Page 50
© 2005 Mitchell Repair Information Company, LLC.