DIAGNOSTIC PROCEDURE
FAST IDLE/RUNS ON DIAGNOSTIC PROCEDURE TABLE
Cruise control system operation improperly
Improper load signal input
Improper operation of electronic throttle
control system
STEP
INSPECTION
RESULTS
ACTION
1
Connect the M-MDS or
equivalent to the DLC-2.
Access ECT PID.
Start and warm up engine
to normal operating
temperature.
Is ECT PID between
82-
112°C {180-234°F}
?
Yes
Go to the next step.
No
ECT PID is higher than
112°C {234°F}:
Go to symptom
troubleshooting
NO.17
COOLING SYSTEM
CONCERNS-
OVERHEATING [LF]
.
ECT PID is less than
82°C {180°F}:
Go to symptom
troubleshooting
NO.18
COOLING SYSTEM
CONCERNS-RUNS
COLD [LF]
.
2
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.
3
Access and monitor
AC_REQ, CPP (MT),
CPP/PNP (MT), and TR
(AT) PIDs.
Are PIDs values normal?
(See
PCM
INSPECTION [LF]
.)
Yes
Go to the next step.
No
If the AC_REQ PID is
not normal:
Inspect A/C switch,
refrigerant pressure
switch, and fan
switch, and related
wiring harness for
vibration or
intermittent
open/short circuit.
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:10 PM
Page 55
© 2005 Mitchell Repair Information Company, LLC.