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EC-380 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0506 ISC SYSTEM P0506 ISC SYSTEM Description INFOID:0000000010095056 The ECM controls the engine idle speed to a specified level via 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 var- ied 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 operation, etc.). DTC Logic INFOID:0000000010095057 DTC DETECTION LOGIC NOTE: If DTC P0506 is displayed with other DTC, first perform the trouble diagnosis for the other DTC. DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- ing the next test. 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. If the target idle speed is out of the specified value, perform EC-21, "IDLE AIR VOLUME LEARNING : , before conducting DTC CONFIRMATION PROCEDURE. TESTING CONDITION: • Before performing the following procedure, confirm that battery voltage is more than 11 V at idle. • Always perform the test at a temperature above −10°C(14°F). >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Turn ignition switch ON. 4. Turn ignition switch OFF and wait at least 10 seconds. 5. Restart engine and run it for at least 1 minute at idle speed. 6. Check 1st trip DTC. YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000010095058 1. CHECK INTAKE AIR LEAKAGE 1. Start engine and let it idle. 2. Listen for an intake air leakage after the mass air flow sensor. DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0506 Idle speed control sys- The idle speed is less than the target idle speed • Electric throttle control actuator |