Lotus Evora User Manual

Lotus Service Notes Section EMR
Page 11
EMR.4 - DIAGNOSTIC GUIDE
Camshaft Timing Control (VVT)
P0011 Camshaft Position – Inlet Timing Over-Advanced or System Performance (Bank 1)
P0012 Camshaft Position – Inlet Timing Over-Retarded (Bank 1)
P0014 Camshaft Position – Exhaust Timing Over-Advanced or System Performance (Bank 1)
P0015 Camshaft Position – Exhaust Timing Over Retarded (Bank 1)
P0021 Camshaft Position – Inlet Timing Over-Advanced or System Performance (Bank 2)
P0022 Camshaft Position – Inlet Timing Over-Retarded (Bank 2)
P0024 Camshaft Position – Exhaust Timing Over-Advanced or System Performance (Bank 2)
P0025 Camshaft Position – Exhaust Timing Over-Retarded (Bank 2)
Description
The Variable Valve Timing system (VVT) on the intake camshafts and the exhaust camshafts can vary the
timing by approximately 35°. The camshaft relative position is varied by a system of vanes mounted on the
drive end of the camshaft. Each VVT oil control valve modulates a spool valve position in accordance with the
drive signal duty cycle, this in turns controls the oil pressure applied to the vanes. A 50% duty cycle applied to
the valve will hold the valve current timing by preventing oil flow from the VVT controller housing, a duty cycle
less than 50% will retard the valve timing, a duty cycle greater then 50% will advance the valve timing. The
ECM regulates this duty cycle based on the feedback signal from the respective camshaft position sensor to
optimise the camshaft timing.
Component connections
Sensor Connector Description ECU Pin ECU Connector
1 Battery Voltage - -
2 VVT Control Valve Inlet (Bank 1) B2 48 Way (Centre)
1 Battery Voltage - -
2 VVT Control Valve Exhaust (Bank 1) A2 48 Way (Centre)
1 Battery Voltage -
2 VVT Control Valve Inlet (Bank 2) A3 48 Way (Centre)
1 Battery Voltage -
2 VVT Control Valve Exhaust (Bank 2) A4 48 Way (Centre)
Monitor:
• Continuous
Enable Criteria:
• Enginerunning>30secs
• Coolanttemperature>60°C(140°F)
Disable Criteria:
• P0116,P0117,P0118–Coolanttemperaturefaultcodes
Malfunction Criteria:
• VVTerror>5degreesfortime>2.5secs
Potential failure modes:
• Staticvalvetimingisincorrect
• VVTcamshaftactuatorfailure
• VVTcontrolvalvestuckopen/closed
• VVTcontrolvalvefilter
Diagnostic Mask:
• TheMILwillbeilluminatedifthefaultsarepresentfor2consecutivetrips
2009/02

Lotus Evora Specifications

General

Brand	Lotus
Model	Evora
Category	Automobile
Language	English