MG MG6 Series 2011 Service Manual page 288

Engine
Purge Valve
The purge valve is located on a bracket on the rear of the
cylinder block and is connected via a flexible pipe to the inlet
manifold and the charcoal canister. The purge valve consists
of a solenoid operated valve, which is connected to the engine
bay harness using connector EM060, is controlled by theECM
using a 12V PWM signal.
Cruise Control
General
The cruise control system (where fitted) is integrated with the
EMS and uses fuelling intervention to automatically maintain a
set vehicle speed. Once engaged, the system can also be used
to accelerate the vehicle without using the throttle pedal. The
cruise control system comprises:
• A master switch, SET and RES steering wheel switches
• A clutch switch (manual transmission only)
• Brake switch
• A warning light in the instrument pack
• The ECM
Cruise control is enabled when the steering wheel master
switch is pressed. Once enabled, the cruise control system
is operated using the steering wheel switches. The steering
wheel switches output signals to the ECM. In the cruise
control mode, theECM adjusts the pulse width of the fuel
injector signals to adjust the fuel supply and the position of
the butterfly in the ETB as necessary to maintain the vehicle
at the set speed.
The cruise control warning light provides a visual indication of
when the system is engaged.
Steering Wheel Switches
The steering wheel switches, the master, SET and RES, are non
latching push switches that engage and disengage cruise control
and adjust the set speed. While pressed, the switches connect
a power supply to the ECM.
Version 2.0
Engine Fuel & Management System
Warning Light
The warning light indicates the status of the cruise control
system. Located in the instrument pack, the warning light
consists of a motorway graphic on a yellow background that
illuminates when cruise control is engaged.
Diagnostics
A diagnostic socket allows the exchange of information
between theECM and the diagnostic tool. The diagnostic
socket is located in the driver's footwell and is constructed to
ISO standard.
TheCAN Bus connects theECM and the diagnostic socket
and allows the retrieval of diagnostic information and the
programming of certain functions to be performed using the
diagnostic tool.
ECM Connector Details
The following tables give input/output information for the
three harness connectors used on the ECM
Connector EM055 (grey) 48 pin
Pin No. Description
Not used
A1
Not used
A2
Not used
A3
Not used
A4
B1
TMAP sensor 1
supply
B2 TMAP sensor 2
supply
B3 Not used
B4 Not used
C1 TMAP2 and PAS
sensor supply
C2 MAP sensor 1
ground
Input/ Output
-
-
-
-
Output
Output
-
-
Output
Output
272