Page 2621 - Foton Workshop Manual - Sauvana

DIAGNOSIS-ENGINE CONTROL SYSTEM 62-569

P000A，P000B，P0012，P0015，P0075，P0076，P0077，
P0078，P0079，P0080 - VVT VALVE FAULT

P000A-The slow reaction or stuck status of Inlet VVT
P000B-The slow reaction or stuck status of Exhaust VVT
P0012-The inlent VVT is not in the default position at start time 62
P0015-The exhaust VVT is not in the default position at start time
P0075-VVT inlet control valve circuit failure
P0076-Circuit voltage of VVT inlent control valve is too low
P0077-Circuit voltage of VVT inlent control valve is too high
P0078-VVT exhaust control valve circuit failure.
P0079-Circuit voltage of VVT exhaust control valve is too low
P0080-Circuit voltage of VVT exhaust control valve is too high

General

1. The intake and exhaustVVTvalves are controlledby theECUpulse width modulation
signal,thereby controlling the engine oil flow ofengine on the intake and exhaust
camshaft position actuator. Movement ofsafe spool valve within the structure of the
camshaft position actuator fixed in front of camshaft is caused by the pressure of
engine oil. When the safe spool valve moves, the engine oil is introduced into the
camshaft position actuator to rotate the intake and exhaust camshafts.
2. Intake and exhaust camshaft position actuator allows the changeof the cam
operating angle of 60° .
3. This design optimizes the camshaft and the relative position of the crankshaft of
the car in the overall operating conditions, which changes the intake andexhaust
overlap angle, increases engine torque and fuel economy, and reduce the emission
of waste gas.
4. The ECUuses the signals from the camshaft and the speed sensor to detect the
actual intake valve timing and perform feedback control.

Page 2621