NO.7 SLOW RETURN TO IDLE [LF]
POSSIBLE CAUSE & DESCRIPTION (SLOW RETURN TO IDLE [LF])
DIAGNOSTIC PROCEDURE
SLOW RETURN TO IDLE DIAGNOSTIC PROCEDURE TABLE
is not available, replace the PCM.
(See
PCM REMOVAL/INSTALLATION [LF]
.)
7
SLOW RETURN TO IDLE
DESCRIPTION
Engine takes more time than normal to return to idle
speed.
POSSIBLE CAUSE
ECT sensor malfunction
Thermostat is stuck open.
Throttle body malfunction
Air leakage from intake-air system
STEP
INSPECTION
RESULTS
ACTION
1
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.
2
Remove thermostat and inspect
operation.
(See
THERMOSTAT
REMOVAL/INSTALLATION
[LF]
.)
(See
THERMOSTAT
INSPECTION [LF]
.)
Is thermostat normal?
Yes
ECT and thermostat are
normal.
Go to the next step.
No
Access ECT PID on the
M-MDS or equivalent.
Inspect for both ECT
PID and temperature
gauge on instrument
cluster readings.
If temperature gauge
on instrument cluster
indicates normal range
but ECT PID is not
same as temperature
gauge reading, inspect
ECT sensor.
If temperature gauge
on instrument cluster
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:09 PM
Page 46
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