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Description
NFEC0795
NOTE:
If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.
The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is
let into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve
is varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects
the actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadly.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration, and engine load (air conditioner, power steering and cooling fan
operation, etc.).
On Board Diagnosis Logic
NFEC0798
DTC No.
Trouble diagnosis
name
DTC Detecting Condition Possible Cause
P0507
0507
Idle speed control
system RPM higher
than expected
The idle speed is not in the specified range. I Electric throttle control actuator
I Intake air leak
DTC Confirmation Procedure
NFEC0800
NOTE:
I If “DTC Confirmation Procedure” has been previously
conducted, always turn ignition switch “OFF” and wait at least
10 seconds before conducting the next test.
I If the target idle speed is out of the specified value, per-
form “Idle Air Volume Learning”, Idle Air Volume Learning
, before conducting “DTC Confirmation Procedure”. For
the target idle speed, refer to the “Service Data and Speci-
fications (SDS)”, EC-749.
TESTING CONDITION:
I Before performing the following procedure, confirm that
battery voltage is more than 11V at idle.
I Always perform the test at a temperature above −10°C
(14°F).
SEF174Y
WITH CONSULT-II
NFEC0800S03
1) Open engine hood.
2) Start engine and warm it up to normal operating temperature.
3) Turn ignition switch “OFF” and wait at least 10 seconds.
4) Turn ignition switch “ON” again and select “DATA MONITOR”
mode with CONSULT-II.
5) Start engine and run it for at least 1 minute at idle speed.
6) If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-449.
DTC P0507 ISC SYSTEM
Description
EC-448
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