Description
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 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 operation, etc.).
DTC Logic
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 conducting the next test.
If the target idle speed is out of the specified value, perform EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement", before conducting DTC CONFIRMATION PROCEDURE.
TESTING CONDITION:
2.PERFORM DTC CONFIRMATION PROCEDURE
Diagnosis Procedure
1.CHECK INTAKE AIR LEAKAGE
2.REPLACE ECM
ICC system operation
The ICC system maintains a selected distance
from the vehicle in front of you within the speed
range 0 to 90 mph (0 to 144km/h) up to the set
speed. The set speed can be selected by the
driver between 20 to 90 mph (32 to 144 km/h),
based on road conditions.
The vehicle travels at the set ...
Radius rod
Removal and Installation
Removal
Remove the rear wheel and tire using power tool. Refer to WT-60,
"Adjustment".
Remove the radius rod nut and bolt from the rear axle housing
using power tools.
Remove the radius rod bolt from the rear suspension member using power
tools.
Remove th ...
Maintenance under severe operating conditions
Severe driving conditions
The maintenance intervals shown on the preceding pages are for normal
operating conditions. If the vehicle is mainly operated under severe driving
conditions as shown below, more frequent maintenance must be performed on the
following items as shown in the table.
...