Land Rover Discovery Owners & Service Manuals

Land Rover Discovery: Starting System - Ingenium i4 2.0l Diesel / Description and Operation

Land Rover Discovery (2009–2016) Service Manual / Powertrain / Engine / Starting System - Ingenium i4 2.0l Diesel / Description and Operation

COMPONENT LOCATION - SHEET 1 OF 3 - VEHICLES WITHOUT AUTO STOP/ START SYSTEM

COMPONENT LOCATION - SHEET 1 OF 3 - VEHICLES WITHOUT AUTO STOP/ START SYSTEM

  1. Stop/Start switch
  2. Engine Control Module (ECM)
  3. Starter motor

COMPONENT LOCATION - SHEET 2 OF 3 - VEHICLES WITH AUTO STOP/START SYSTEM - MANUAL TRANSMISSION

COMPONENT LOCATION - SHEET 2 OF 3 - VEHICLES WITH AUTO STOP/START SYSTEM - MANUAL TRANSMISSION

  1. Stop/Start switch
  2. Engine Control Module (ECM)
  3. Starter motor
  4. Auto Stop/Start switch

COMPONENT LOCATION - SHEET 3 OF 3 - VEHICLES WITH AUTO STOP/START SYSTEM - AUTOMATIC TRANSMISSION

COMPONENT LOCATION - SHEET 3 OF 3 - VEHICLES WITH AUTO STOP/START SYSTEM - AUTOMATIC TRANSMISSION

  1. Stop/Start switch
  2. Engine Control Module (ECM)
  3. Starter motor
  4. Auto Stop/Start switch

OVERVIEW

The starting system is equipped with a starter motor incorporating a single solenoid, in a system with or without auto stop/start system.

Both types of starting system are passive systems controlled by the Engine Control Module (ECM). The ECM initiates starting system operation when a valid smart key is in the vehicle and the engine stop/start switch is pressed.

The ECM controls operation of the starter motor using a starter relay in the Engine Junction Box (EJB), on vehicles with and without stop/start system.

On vehicles with auto stop/start system the ECM interacts with other vehicle systems to determine when stop/start operation is required. An auto stop/start warning indicator provides a visual indication when the engine is stopped in a stop/start cycle. The stop/start function is automatically activated each time an ignition cycle occurs. However, if required the driver can deactivate the system using an auto stop/start switch.

Vehicles with auto stop/start system incorporate a brake vacuum sensor to enable the ECM to monitor the pressure in the brake booster during stop/start operation.

To accommodate the increased electrical loads, vehicles are fitted with two batteries if equipped with the auto stop/start system.

COMPONENT DESCRIPTION

STARTER MOTOR

STARTER MOTOR

  1. Starter motor solenoid - vehicles with manual transmission
  2. Starter motor solenoid - vehicles with automatic transmission
  1. Solenoid electrical connection
  2. Starter motor electrical connection
  3. Breather pipe
  4. Starter motor
  5. Pinion gear
  6. Starter motor solenoid

The starter motor is attached to the cylinder block, at the joint between the transmission and the engine. The pinion gear of the starter motor protrudes through an aperture in the transmission housing, adjacent to the ring gear on the drive plate. The starter motor incorporates a snorkel breather pipe to assist with ventilation and sealing, during water submergence.

The starter motor has the motor located directly behind the pinion gear.

The motor is geared directly to the pinion gear and is a pre-engaged type comprising a series wound motor and an over-running clutch.

The starter solenoid is connected to a power feed from the starter relay in the EJB, which is controlled by the ECM. When the starter solenoid is energized it engages the pinion gear with the ring gear and simultaneously closes a switch to supply the motor with power from the starter fuse on the battery positive terminal.

Auto Stop/Start Starter Motor Strategy

Engine restart without starter motor intervention

When the ECM detects engine restart parameters resulting from a driver action or system request, the ECM activates the fuel injection and ignition systems to allow the engine to continue to operate. This is available at a variable engine speed threshold which depends on engine type.

Engine restart with starter motor intervention

If the ECM cannot restart the engine without intervention, the restarting of the engine is controlled via the starter motor. The starter motor has the capability of engaging with the transmission ring gear whilst still rotating.

If an engine restart is initiated, the ECM activates the starter motor via the starter relay at the earliest opportunity to rotate the engine, then on the first available compression the ECM operates the fuel injection and ignition systems to restart the engine in less than 0.36 sec.

READ NEXT:

 Stop / Start Switch

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. A

 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

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