DESCRIPTION
The Variable Valve Timing (VVT) system includes the ECM, Oil Control Valve (OCV) and VVT controller.
The ECM sends a target duty-cycle control signal to the OCV. This control signal regulates the oil pressure supplied to the VVT controller. Camshaft timing control is performed according to engine operating conditions such as intake air volume, throttle valve position and engine coolant temperature.
The ECM controls the OCV, based on the signals transmitted by several sensors. The VVT controller regulates the intake camshaft angle using oil pressure through the OCV. As a result, the relative positions of the camshaft and crankshaft are optimized, the engine torque and fuel economy improves, and the exhaust emissions decrease under overall driving conditions. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control.
This is how the target intake valve timing is verified by the ECM.
MONITOR DESCRIPTION
After the ECM sends the "target" duty-cycle signal to the OCV, the ECM monitors the OCV current to establish an "actual" duty-cycle. The ECM detects a malfunction and sets a DTC when the actual dutycycle ratio varies from the target duty-cycle ratio.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
1 PERFORM ACTIVE TEST BY CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV)
(a) Connect the intelligent tester to the DLC3.
(b) Start the engine and turn the tester on.
(c) Warm up the engine.
(d) On the tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1 or VVT CTRL B2.
(e) Check the engine speed while operating the Oil Control Valve (OCV) using the tester.
2 INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
(a) Disconnect the C23 or C24 camshaft timing oil control valve (OCV) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance
(c) Reconnect the OCV connector.
3 CHECK HARNESS AND CONNECTOR (OCV - ECM)
(a) Disconnect the C23 or C24 camshaft timing oil control valve (OCV) connector.
(b) Disconnect the E11 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open)
Standard resistance (Check for short)
(d) Reconnect the OCV connector.
(e) Reconnect the ECM connector.
REPLACE ECM (See page ES-498)
Diagnosis system
DESCRIPTION
(a) When troubleshooting OBD II (On-Board
Diagnostics) vehicles, an intelligent tester
(complying with SAE J1987) must be connected to
the DLC3 (Data Link Connector 3) of the vehicle.
Various data in the vehicle's ECM (Engine Control
Module) can be then read.
(b) OBD II regu ...
Wrong Disc/ Disc cannot be Read
DTC 44-41 Wrong Disc
DTC 44-42 Disc cannot be Read
DESCRIPTION
DTC No.
DTC Detection Condition
Trouble Area
44-41
An unsuitable disc is inserted
DVD
Television display assembly
44-42
The disc cannot be read.
INSPECTION ...
Using the rear view monitor system
Screen description
The rear view monitor system screen will be displayed if the shift
lever is shifted to R while the engine switch is in the “ON” position
(vehicles without a smart key system) or IGNITION ON mode (vehicles
with a smart key system).
Vehicle width guide line
The lin ...