Mazda MX-5 Miata Sport 2007 Manual page 1988

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
DIAGNOSTIC PROCEDURE
FAST IDLE/RUNS ON DIAGNOSTIC PROCEDURE TABLE
STEP
1
2
3
2007 Mazda MX-5 Miata Sport
INSPECTION
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} ?
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?
Access and monitor
AC_REQ, CPP (MT),
CPP/PNP (MT), and TR
(AT) PIDs.
Are PIDs values normal?
(See PCM
INSPECTION [LF] .)
Cruise control system operation improperly

Improper load signal input

Improper operation of electronic throttle

control system
RESULTS
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] .
Yes DTC is displayed:
Go to the appropriate
DTC inspection.
(See DTC TABLE
[LF] .)
No No DTC is displayed:
Go to the next step.
Yes Go to the next step.
No If the AC_REQ PID is
not normal:
ACTION
Inspect A/C switch,

refrigerant pressure
switch, and fan
switch, and related
wiring harness for
vibration or
intermittent
open/short circuit.