NO.9 FAST IDLE/RUNS ON [LF]
POSSIBLE CAUSE & DESCRIPTION (FAST IDLE/RUNS ON [LF])
20
Inspect variable valve
timing control system
operation.
(See
VARIABLE
VALVE TIMING
CONTROL SYSTEM
OPERATION
INSPECTION
.)
Does variable valve
timing control system
function properly?
Yes
Go to the next step.
No
Repair or replace the
malfunctioning part.
21
Is engine compression
correct?
Yes
Inspect the valve timing.
(See
VARIABLE VALVE
TIMING ACTUATOR
INSPECTION [LF]
.)
No
Inspect for causes.
22
Verify test results.
If normal, return to diagnostic index to service any additional
symptoms.
(See
ENGINE SYMPTOM TROUBLESHOOTING [LF]
.)
If malfunction remains, inspect related Service Bulletins and/or On-
line Repair Information and perform repair or diagnosis.
If vehicle is repaired, troubleshooting completed.
If vehicle is not repaired or additional diagnostic information
is not available, replace the PCM.
(See
PCM REMOVAL/INSTALLATION [LF]
.)
9
FAST IDLE/RUNS ON
DESCRIPTION
The engine speed continues at fast idle after
warm-up.
The engine runs after the ignition switch is
turned off.
POSSIBLE CAUSE
ECT sensor malfunction
Air leakage from intake-air system
Throttle body malfunction
Accelerator pedal position sensor
misadjustment
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:10 PM
Page 54
© 2005 Mitchell Repair Information Company, LLC.
