DTC    P0010    Camshaft Position "A" Actuator Circuit (Bank 1)

DTC    P0020    Camshaft Position "A" Actuator Circuit (Bank 2)

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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.

A103843E02


DTC No.
DTC Detection Condition
Trouble Area
P0010
Open or short OCV for intake camshaft (bank 1) circuit
(1 trip detection logic)
  1. Open or short OCV for intake camshaft (bank 1) circuit
  2. OCV for intake camshaft (bank 1)
  3. ECM
P0020
Open or short OCV for intake camshaft (bank 2) circuit
(1 trip detection logic)
  1. Open or short OCV for intake camshaft (bank 2) circuit
  2. OCV for intake camshaft (bank 2)
  3. 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 duty-cycle ratio varies from the target duty-cycle ratio.

WIRING DIAGRAM


A086808E07


INSPECTION PROCEDURE

HINT:
  1. If DTC P0010 is displayed, check the right bank VVT system for intake camshaft circuit.
  2. Bank 1 refers to the bank that includes cylinder No. 1.
  3. If DTC P0020 is displayed, check the left bank VVT system for intake camshaft circuit.
  4. Bank 2 refers to the bank that does not include cylinder No. 1.
  5. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1.PERFORM ACTIVE TEST BY CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine and turn the tester ON.

  1. Warm up the engine.

  1. On the tester, enter the following menus: Power train / Engine / Active Test / Activate the VVT System (Bank 1) or Control the VVT System (Bank 2).

  1. Check the engine speed while operating the Oil Control Valve (OCV) using the tester.

    OK:

    Tester Operation
    		Specified Condition
    OCV OFF
    		Normal engine speed
    OCV ON
    		Engine idles roughly or stalls (soon after OCV switched from OFF to ON)



OK
CHECK FOR INTERMITTENT PROBLEMS
NG


2.INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV FOR INTAKE CAMSHAFT)


    A094633E08

  1. Disconnect the E49 or E48 OCV connector.

  1. While idling, check the waveform between the terminals of the E49 or E48 OCV connector using an oscilloscope.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E49-1 (+) - E48-2 (-)
    		Correct waveform is as shown
    E48-1 (+) - E48-2 (-)
    		Correct waveform is as shown

  1. Reconnect the OCV connector.



OK
REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
NG


3.INSPECT ECM (OCV SIGNAL)


    A107186E02

  1. Inspect the ECM using an oscilloscope.

  1. While idling, check the waveform between the terminals of the E6 or E8 OCV connector using an oscilloscope.

    Standard voltage:
    Tester Connection
    		Specified Condition
    OC1+ (E8-34) - OC1- (E8-33)
    		Correct waveform is as shown
    OC2+ (E6-9) - OC2- (E6-8)
    		Correct waveform is as shown



NG
REPLACE ECM
OK

REPAIR OR REPLACE HARNESS AND CONNECTOR