Idle speed control system RPM higher than expected
The idle speed is more than the target idle speed by 200 rpm or more.
sounds likes it could simply be a dirty throttle body. to the dealer!
"DTC P0507 ISC SYSTEM PFP:23781
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 steadily.
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
On Board Diagnosis Logic EBS00C2H
DTC Confirmation Procedure EBS00C2J
l If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF” and
wait at least 10 seconds before conducting the next test.
l If the target idle speed is out of the specified value, perform “Idle Air Volume Learning”, EC-677 ,
before conducting “DTC Confirmation Procedure”. For the target idle speed, refer to the “Service
Data and Specifications (SDS)”, EC-1301 .
l Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
l Always perform the test at a temperature above -10°C (14°F).
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 EC-1036, "Diagnostic Procedure"
Follow the procedure “WITH CONSULT-II” above.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Idle speed control system
RPM higher than
The idle speed is more than the target idle
speed by 200 rpm or more.
l Electric throttle control actuator
l Intake air leak
l PCV system"
^there you go.
Cool thanks guys!! I'll will post a few codes #'s and descriptions I have too. Thank you once again guys.
this is a website I like to look at they have great articles on how to fix and manage some codes.
P1105 MAP/BARO Switch Solenoid Valve
P1110 Intake Valve Timing Control (Left Bank)
P1120 Secondary Throttle Position Sensor (STPS)
P1125 TPS Intermittent
P1130 Swirl Control Valve Control Solenoid Valve
P1135 Intake Valve Timing Control (Right Bank)
P1140 Intake Valve Timing Control Position Sensor (Left Bank)
P1145 Intake Valve Timing Control Position Sensor (Right Bank)
P1148 Closed Loop Control (Bank 1)
P1165 Swirl Control Valve Control Vacuum Check Switch
P1168 Closed Loop Control (Bank 2)
P1210 Traction Control System (TCS)
P1220 Fuel Pump Control Module (FPCM)
P1320 Ignition Signal, Primary - Related Information
P1335 Crankshaft Position Sensor (CKPS) (Ref)
P1336 Crankshaft Position Sensor (CKPS) (Cog)
P1400 EGRC Solenoid Valve - Read Our Article On EGR Valve Codes For Help With This Infiniti Check Engine Light Code
P1401 EGR Temperature Sensor - Read Our Article On EGR Valve Codes For Help With This Infiniti Check Engine Light Code
P1402 EGR Function (Open) - Read Our Article On EGR Valve Codes For Help With This Infiniti Check Engine Light Code
P1440 EVAP Control System (Small Leak) (Positive Pressure)
P1441 VC/V Bypass Valve
P1443 Canister Control Vacuum Check Switch
P1444 Canister Purge Volume Control Solenoid Valve
P1445 Purge Volume Control/V
P1446 EVAP Canister Vent Control Valve (Close)
P1447 EVAP Control System Purge Flow Monitoring
P1448 EVAP Canister Vent Control Valve (Open)
P1490 Vacuum Cut Valve Bypass Valve (Circuit)
P1491 Vacuum Cut Valve Bypass Valve
P1492 EVAP Canister Purge Control/Solenoid Valve (Circuit)
P1493 EVAP Canister Purge Control Valve/Solenoid Valve
P1605 A/T Diagnosis Communication Line
P1705 Throttle Position Sensor
P1706 PNP Switch
P1760 Overrun Clutch Solenoid Valve
P1900 Cooling Fan
Last edited by Rubare; 11-27-2009 at 07:46 AM.