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EC-312 < COMPONENT DIAGNOSIS > [QR25DE] P0506 ISC SYSTEM P0506 ISC SYSTEM Description INFOID:0000000004211545 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 and deceleration. DTC Logic INFOID:0000000004211546 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-16, "IDLE AIR VOLUME LEARNING : , before conducting DTC Confirmation Procedure. TESTING CONDITION: • Before performing the following procedure, confirm that battery voltage is more than 11V at idle. • Always perform the test at a temperature above −10°C(14°F). >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Activate “INSPECTION MODE 1” ( .) to start engine, and warm up engine 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. Activate “INSPECTION MODE 1” ( .) to start engine, and let engine idle for at least 1 minute. 6. Check 1st trip DTC. YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000004211547 1. CHECK INTAKE AIR LEAK 1. Activate “INSPECTION MODE 1” ( ) to start. 2. Listen for an intake air leak 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 |