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DTC Description
 
 
DESCRIPTION
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 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 DETECTION LOGIC
DTCM.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
P050600ISC SYSTEM
(Idle Control System RPM - Lower Than Expected)
Diagnosis conditionEngine runnng at idle
Signal (terminal)—
ThresholdThe idle speed is less than the target idle speed by 100 rpm or more
Diagnosis delay time—
 
 
POSSIBLE CAUSE
  • Electric throttle control actuator
  • Intake air leaks
 
 
FAIL-SAFE
Not applicable
 
 
DTC Confirmation Procedure
1.CHECK DTC PRIORITY
If DTC P0506 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.
Is applicable DTC detected?
Perform diagnosis of applicable. Refer to DTC Index.
.
 
2.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting 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 refer to Work Procedure, 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).
: .
 
3.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. Start engine and run it for at least 1 minute at idle speed.
  4. Check 1st trip DTC.
Is 1st trip DTC detected?
Proceed to DTC Diagnosis Procedure.
-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident.
-2Confirmation after repair: INSPECTION END