Land Rover Discovery: Stop / Start Switch
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The stop/start switch is located in the Instrument Panel (IP) and is hardwired to the Central Junction Box (CJB). When the switch is pressed two signal lines from the CJB are connected to ground.
AUTO STOP/START WARNING INDICATOR
The auto stop/start warning indicator is located in the Instrument Cluster (IC). The warning indicator comes on when the engine stops during a stop/start cycle, then goes off when the engine restarts. The warning indicator is controlled in the IC by a Medium Speed Controller Area Network (MS-CAN) comfort bus message from the ECM.
AUTO STOP/START SWITCH
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The auto stop/start switch is located in the front floor console. An amber Light Emitting Diode (LED) in the auto stop/start switch remains illuminated while the auto stop/start system is active. The auto stop/start switch sends a signal to the CJB using the MS-CAN comfort bus, to inform the ECM assembly when on or off.
BRAKE VACUUM SWITCH
To ensure the brake system is never compromised, a brake vacuum switch is installed on auto stop/start vehicles to monitor vacuum reserves in the brake booster. The brake vacuum switch is mounted in the vacuum pipe and hardwired to the ECM. If the brake vacuum decreases below a set threshold while stop/start is enabled, the ECM either:
- Restarts the engine to replenish the vacuum reserves
- Inhibits the engine shutting down if vacuum reserves are not sufficient.
An example of vacuum reserves depleting, is by the driver repeatedly pressing the brake pedal while the engine is shut down during an auto stop/start stop. This action will initiate an engine restart when vacuum reserves decrease below the set threshold.
If a fault develops with the brake vacuum sensor a Diagnostic Trouble Code (DTC) will be logged in the ECM.
NEUTRAL GEAR SENSOR
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A permanent magnet, linear contactless displacement sensor is located on the exterior of the transmission casing and hardwired to the ECM. The sensors function is to detect that neutral gear has been selected within a calibrated window.
SYSTEM OPERATION
Starting System - Ingenium
i4 2.0l Diesel / Description
and OperationVehicles Without Auto
Stop / Start
System
READ NEXT:
Vehicles Without Auto
Stop / Start
System
Engine cranking is requested when the stop/start switch is pressed and the
driver has depressed the brake pedal. When engine cranking is requested,
the ECM checks that a valid key code has been receiv
Starting System - Ingenium
i4 2.0l Diesel / Diagnosis and Testing
PRINCIPLES OF OPERATION
For a detailed description of the Starting System, refer to the relevant
Description and Operation section in the workshop manual. REFER to:
Starting System (303-06C Starting S
SEE MORE:
Fuel Rail Pressure
Control Valve (PCV)
The fuel rail Pressure Control Valve (PCV) is located in a threaded port in
the
rearward end of the fuel rail. The PCV regulates the fuel pressure within the
fuel rail and is controlled by the ECM using Pulse Width Modulation (PWM)
outputs to the solenoid valve.
When the solenoid is de-energized
Portable media connections
Portable media devices can be connected
to the media hub, located in the cubby
box. Compatible portable devices include:
USB mass storage devices (e.g., a
memory stick). Devices must use FAT
or FAT32 file format.
iPod (iPod Classic, iPod Touch, iPhone,
and iPod Nano are supported - full
funct
