Cadillac 2014 ELR User Manual download pdf (Page 2)

2 January 2014

energy that the drive motor creates is transferred by the power

inverter module to the battery pack. Constant communication

between the power inverter module and the Electronic Brake Con-

trol Module allows the blending of regenerative braking force with

hydraulic braking force.

Regen on Demand

Regen on Demand will slow the vehicle by recapturing energy.

It works in Drive and Low. To activate Regen on Demand, pull

and hold either paddle on the back of the steering wheel without

pressing the brake pedal or accelerator pedal. Regen on Demand

is deactivated once the paddles are released, or the brake pedal

or accelerator pedal is pressed. Cruise control will turn off, and

the brake lights may turn on, when this feature is activated.

TIP: Regen on Demand will not stop the car.

HIGH VOLTAGE LITHIUM-ION DRIVE MOTOR

BATTERY SYSTEM

The heart of the ELR's electric propulsion system is its advanced

Lithium-Ion Drive Motor Battery System. The hybrid battery

contains 288 cells, organized into three battery sections, with a

nominal system voltage of 355 V direct current.

The battery energy control module monitors the voltage of

the battery cells through four hybrid battery interface control

modules. The battery is liquid cooled for long life and optimum

performance.

The high volt-

age battery is

located beneath

the vehicle. The

battery energy

control module,

battery inter-

face control

modules 1-4,

current sensor,

and high volt-

age contactors

are located

within the battery assembly. The Powertrain Control Module 2

(the host controller for Diagnostic Trouble Code information) is

located under the front passenger seat.

TIP: Before performing service, ensure all High Voltage

Safety procedures and Warnings are followed exactly as written.

Personal Protection Equipment (PPE) MUST be worn and proper

procedures MUST be followed.

The Manual Service Disconnect (MSD) is located under the front

ﬂoor console rear trim panel. Removing the rear trim panel will

expose the MSD.

Drive Motor Battery Charging

The lithium-ion high voltage battery pack can be charged using

the provided charging cord and a 120-volt standard outlet. Charge

times will vary with outside temperature.

Charging Status Indicators are located on the instrument panel

near the windshield and in the side mirrors (if activated).

DRIVETRAIN

The underhood gas powered electric generator is a 1.4L DOHC

inline four cylinder engine that produces 83 HP (62 kW). Premium

gasoline with a posted octane rating of 91 or higher is required.

Internal Combustion Engine (ICE) Starting

Instead of a 12 V starter motor, a much more powerful 300 V

Drive Motor A, located within the transmission, is utilized to crank

the engine. Drive Motor A can rotate the engine to operating

speed of 800 RPM within just a few hundred milliseconds, allowing

near-instant starting. The vehicle’s on-board computers determine

when the engine needs to run:

• The hybrid/EV battery pack has a low state of charge.

• The hood is open or not completely latched.

• The engine is needed to maintain the high voltage battery pack

temperature.

• The engine needs to run for maintenance.

• Low ambient temperatures. At temperatures of 35°F (2°C) and

colder, the engine can run to provide both electric power and

heat to supplement the electric heater. This can happen regard-

less of battery charge level.

Service Mode

Service Mode is available for service and diagnostics and to verify

the proper operation of the MIL and may be required for emission

inspection purposes. With the vehicle off and the brake pedal not

applied, pressing and holding the POWER button for more than

5 seconds will place the vehicle in Service Mode. The vehicle will

not be able to be driven. The propulsion system will not start in

Service Mode.

Transmission

The 4ET50 (RPO MKA) is a fully automatic electronically con-

trolled transmission. It consists primarily of a torque dampener

assembly, an integral main and auxiliary ﬂuid pump and housing,

one planetary gear set, three clutch assemblies, a hydraulic pres-

surization and control system, and two internal electric motors.

Drive motor generator A is 55 kW and drive motor generator B is

135 kW.

The planetary gear set provides the electrically variable forward

mode ratios and reverse. The TCM and the drive motor generator

power inverter module vary the torque output at the optimum time

based on throttle position.

The main hydraulic system primarily consists of a gerotor-type

pump, control valve body assemblies, dampener housing and case.

A secondary auxiliary pump with electric three phase high voltage

motor located inside the transmission maintains working pressures

when the engine is off.

ELECTRICAL ARCHITECTURE

The 2014 ELR uses GM’s Global A electrical architecture. This

architecture requires the use of the Global Diagnostic System 2

(GDS 2) software and the Multiple Diagnostic Interface (MDI)

module.

AGM 12V Battery

The ELR uses an Absorbent Glass Mat (AGM) 12 V battery that

requires different charging voltages than conventional lead acid

batteries. The essential tool (GR-8) EL-50313 has this algorithm

built in. Select AGM when prompted or damage to the battery

will result.

The ELR uses the 12 V battery to wake up and initialize control

modules. If the vehicle does not power up, verify that the 12 V

battery is sufﬁciently charged to allow all of the control modules to

wake up.

2014 Cadillac ELR – continued from page 1

continued on page 3

The hybrid battery is organized into three

battery sections beneath the vehicle.

1 2 3 4 5 6 7 ... 10 11

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