Variable Valve Timing and Control (VVT) - Automobili Lamborghini ...

Automobili Lamborghini s.p.a. OBDII – MY 09 Section 13 Page 1
OBD Group 9NL-V
Test Group – 9NLXV06.5474
OBD Description
Revision date:
Issue date: oct/07
Variable Valve Timing and Control (VVT)
System Monitoring
_____________________________________________________________________________________________________________

Automobili Lamborghini s.p.a. OBDII – MY 09 Section 13 Page 2
OBD Group 9NL-V
Test Group – 9NLXV06.5474
OBD Description
Revision date:
Issue date: oct/07
Description
_____________________________________________________________________________________________________________

Automobili Lamborghini s.p.a. OBDII – MY 09 Section 13 Page 3
OBD Group 9NL-V
Test Group – 9NLXV06.5474
OBD Description
Revision date:
Issue date: oct/07
Lamborghini engines are equipped with a Variable Valve Timing (VVT) system that operates for
each bank on the intake valves and on the exhaust valves.
According to the requirements in CARB Ҥ1968.2. Malfunction and Diagnostic System
Requirements--2004 and Subsequent Model-Year Passenger Cars, Light-Duty Trucks, and
Medium-Duty Vehicles and Engines” Section (e) (13.1), the VVT System is considered malfunctioning
when, for all 2006 and subsequent model year Low Emission Vehicles, a target error and/or a slow
response of a commanded VVT System causes an increase of the vehicle’s emission of 1.5 times.
Lamborghini OBD II system monitors the components and the performance of VVT system. It
monitors:
1) every cam sensor;
2) the crankshaft position sensor;
3) the Signal Sequence;
4) every solenoid oil control valve (OCV);
5) the alignment between crankshaft and camshaft;
6) the performance of VVT system.
The diagnosis at points from 1 to 5 are described in the Comprehensive Component Monitoring
Section, (e) (from 16.8.1 to 16.8.5).
The following diagnosis is performed, on each bank, both for the performance of the inlet VVT
System and for the performance of the exhaust one. It is a diagnosis that contemporary monitors the
target position and the response time.
The difference between the requested cam position (VVT Target Position) and the actuated one is
higher than a threshold for a fixed time and an error counter increases. When this counter overcomes a
calibration threshold of 5 times, the fault is detected and the corresponding pending fault code is stored.
The Pcodes for this diagnosis are:
P1366: Intake Variable Valve Timing Control Range/Performance Bank 1
P1367: Exhaust Variable Valve Timing Control Range/Performance Bank 1
P1368: Intake Variable Valve Timing Control Range/Performance Bank 2
P1369: Exhaust Variable Valve Timing Control Range/Performance Bank 2.
The functional check isn’t performed if one of the following diagnostics is already in fault:
1) the corresponding cam sensor;
2) the crankshaft position sensor;
3) the Signal Sequence;
4) the corresponding solenoid oil control valve (OCV);
5) the alignment between crankshaft and the “in question” camshaft.
_____________________________________________________________________________________________________________