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:
Electronic Engine Controls
- Ingenium i4 2.0l Diesel
COMPONENT LOCATION - SHEET 1 OF 5
Clutch pedal position sensor
Accelerator Pedal Position (APP) sensor
Clutch Bottom of Travel (BOT) switch
Brake pedal switch
Transmission Control Switch (TCS) - Automatic transmission only
Diesel Exhaust Fluid (DEF) heater control unit
Diesel exhaust fluid
Diesel Exhaust Fluid (DEF) Level / Quality.16 MY EU A 16 MY NAS
A
Diesel Exhaust Fluid (DEF) Level .16 MY EU A 16 MY NAS A
The level of DEF in the tank is checked via the Instrument Cluster (IC) menu.
When selected the message centre displays the approximate amount of DEF
remaining, providing an estimated km/miles figure remaining, prior to
emptyin
