Description

The 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 the 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 improve, 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.

M A103843E08

DTC No.

DTC Detection Conditions

Trouble Areas

With warm engine and engine speed of between 550 rpm and 4,000 rpm, all conditions (1), (2) and (3) met (1 trip detection logic):

1. Difference between target and actual intake valve timings more than 5°CA (Crankshaft Angle) for 4.5 seconds

2. Current intake valve timing fixed (timing changes less than 5°CA in 5 seconds)

3. Variations in VVT controller timing more than 19°CA of maximum delayed timing (malfunction in advance timing)

• Camshaft timing gear assembly

• ECM

With warm engine and engine speed of between 550 rpm and 4,000 rpm, all conditions (1), (2) and (3) met (2 trip detection logic):

1. Difference between target and actual intake valve timings more than 5°CA (Crankshaft Angle) for 4.5 seconds

2. Current intake valve timing fixed (timing changes less than 5°CA in 5 seconds)

3. Variations in VVT controller timing 19°CA or less of maximum delayed timing (malfunction in retarded timing)

• Camshaft timing gear assembly

• ECM

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

Get My Free Ebook


Post a comment