Peugeot 308: Organisation bulletin : Commercial launch : MHEV (Mild Hybrid Electrical Vehicule) hybrid drive train

Peugeot 308 2021-2025 (P5) Service Manual / Vehicle :: General / Data - identification / Organisation bulletin : Commercial launch : MHEV (Mild Hybrid Electrical Vehicule) hybrid drive train

N.B. : This document is only valid for the initial launch. Future developments will not be updated.

N.B. : This bulletin presents all the technical information required by authorised repairers and new vehicle and parts distributors for the launch of the ‎MHEV (Mild Hybrid Electrical Vehicule) vehicles.

1. Summary

Section	Description
2	Presentation of the MHEV (Mild Hybrid Electrical Vehicule) mild hybrid technology
– 2.1	Main features
-- 2.2	Instruments and controls
-- 2.3	Location
3	Special features of the MHEV (Mild Hybrid Electrical Vehicule) mild hybrid technology
4	Components of the mild hybrid drive train
– 4.1	EB2LT engine (Generation 3)
– 4.2	e-DCT6-type hybrid double-clutch piloted manual gearbox
– 4.3	Electrical components
–– 4.3.1	Traction battery
–– 4.3.2	48 V starter
–– 4.3.3	DC/DC direct voltage transformer
–– 4.3.4	Ancillaries battery
–– 4.3.5	48 V drive circuit
– 4.4	Cooling of the electrical components
– 4.5	Operating temperature
5	Diagnostic info
– 5.1	Replacement of parts
– 5.2	Downloading
– 5.3	After-sales operations
6	Authorisations and repairs
– 6.1	Authorisation
– 6.2	Repair
7	Special tools
8	Training for the aftersales activity
9	Aftersales documentation
10	Pre-Delivery Inspection (PDI)
11	Maintenance
12	Countryside
13	Escalation of customer incidents
14	Technical assistance
15	Warranty
– 15.1	Warranty conditions
– 15.2	Return of parts and packaging

2. Presentation of the MHEV (Mild Hybrid Electrical Vehicule) mild hybrid technology

The mild hybrid technology includes :

An EB2 1.2 L internal combustion engine approved for the EURO 6.4 emission control standard in Europe (100 hp / 75 kW or 136 hp / 100 kW)
An electric drive machine integrated with the e-DCT6-type piloted manual gearbox with hybrid double clutch

2.1. Main features

2.1.1Description.

Illustration	Key
	CO2 emissions lower by 22 g compared to a petrol engine equipped with a AT8 automatic gearbox with the Stop and Start function (According to version)
	First level of the hybrid experience
	Better response times at low engine speed
	Towing a trailer : Approximately 1100 kg (According to version)
	No charging of the traction battery using a charging cable
	Lithium-ion traction battery : 48V
	e-DCT6-type hybrid double-clutch piloted manual gearbox
	Internal combustion engine EB2LT (Generation 3)

The electric drive machine integrated with the e-DCT6-type piloted manual gearbox with hybrid double clutch supplies the driving energy to the vehicle on its own :

In electric mode
In automatic mode during phases of driving at low speed
When moderate load is used

The assembly assists the internal combustion engine on acceleration and compensates for torque breaks during gear changes.

The switch from internal combustion mode to electric mode is automatic when the conditions permit (driver demands, batteries’ charge status, exterior temperature, etc.).

The electric drive machine starts the internal combustion engine.

The 48 V starter assists the restarting of the internal combustion engine during the phases of electric/internal combustion transition.

The 2 drive sources (internal combustion engine, electric drive machine) can also be combined in certain driving conditions(Example : "boost" effect when accelerating sharply to overtake a vehicle).

2.1.2 operating cycles.

Identification	Type of driving	Operation	Illustration	Result
A	Normal driving	The internal combustion engine and the electric drive machine work together or separately to optimise energy consumption and provide drive to the vehicle’s wheels		Reduction in CO2 emissions
B	Acceleration	The internal combustion engine and the electric drive machine work together to provide drive to the vehicle’s wheels		"boost" effect
C	Deceleration	The vehicle’s wheels supply energy to the electric drive machineThe electric drive machine charges the traction battery		Energy recuperation
D	Driving smoothly and at low speed	The electric drive machine provides drive to the vehicle’s wheels and the internal combustion engine stops(If the activation conditions are met)		Driving in 100% electric mode

2.2. Instruments and controls

2.2.1Man-machine interface (IHM).

Identification	Key
"a"	Specific MHEV information on the instrument panel- Driving mode- Status of the internal combustion engine- Power consumed indicator- Dedicated alerts
"b"	Driving mode selector
"c"	Sequential gear lever (e-Toogle)
"d"	"M" mode
"e"	Paddles at the steering wheel
"f"	"Stop and Start" function deactivation control
"g"	Stop and Start function deactivation indicator lamp (On the instrument panel)

2.2.2Displaying of the energy flow.

The instrument panel indicates the energy flow between :

The traction battery
The internal combustion engine
The electric drive machine
The wheels

The instrument panel indicates the traction battery charge status.

2.3. Location

(1) Traction battery cooling circuit pipes.

(2) Traction battery cooling circuit coolant pumpVLTP (Very Low Temperature Pump).

(3) Traction battery cooling circuit pipes.

(4) Traction battery.

(5) EB2LT engine (Generation 3).

(6) Ancillaries battery.

(7) Engine management ECU.

(8) Pedestrian horn.

(9) 48 V starter.

(10) e-DCT6-type hybrid double-clutch piloted manual gearbox.

(11) Air conditioning pipes.

(12) Coolant - air conditioning heat exchanger (Chiller).

(13) DC/DC direct voltage transformer.

(14) Sealed fuse and relay box (BFRE).

The traction battery is located :

At the front left seat, under the floor, on the EMP2 platform
Under the front left seat, in the passenger compartment, above the floor, on the CMP platform

The location of the traction battery :

Does not affect the boot volume and the interior space, unlike certain competitors
Increases the fuel economy, by reducing the heat energy losses linked to the length of the electrical power harness
Saves more fuel compared to traditional traction battery locations at the rear of vehicles

Location of the traction battery on the EMP2 platform.

N.B. : The traction battery is protected by a screen under the body.

Location of the traction battery on the CMP platform.

On the CMP platform :

The floor carpet, which is adapted to cover the traction battery, is visible when the seat is pushed back but does not disrupt accessibility to the instruments and controls
In order to access the traction battery, a cut-out in the floor carpet is necessary

3. Special features of the MHEV (Mild Hybrid Electrical Vehicule) mild hybrid technology

The special features of the MHEV technology are as follows :

e-DCT6-type hybrid double-clutch piloted manual gearbox
DC/DC direct voltage transformer
48 V traction battery
Passenger compartment air heating resistor (Versions for very cold climates)
Cooling circuits
48 V starter
Ancillaries battery
Energy recovery mode when decelerating or braking

4. Components of the mild hybrid drive train

The vehicle contains new components related to the traction system and also new technologies supplied with traction voltage (48V).

4.1. Internal combustion engine EB2LT (Generation 3)

The internal combustion engine is based on a new generation of PureTech petrol engine (Generation 3).

Refer to the launch bulletin for the EB2LT internal combustion engine, available on the manufacturer’s aftersales documentation portal .

4.2. e-DCT6-type hybrid double-clutch piloted manual gearbox

The MHEV (Mild Hybrid Electrical Vehicule) mild hybrid technology uses a new generation of e-DCT6 piloted manual gearbox with hybrid double clutch designed and produced by the Joint Venture between Punch Powertrain and STELLANTIS.

The electric transmission with double clutch is designed as a native P2 hybrid architecture with a high level of modularity between the mild hybrid technology and the new PHEV (Plugin Hybrid Electric Vehicle) technology.

The piloted manual gearbox with hybrid double clutch includes :

An eMotor electric drive machine (Of the same brand as the electric drive machines on the BEV versions)
An electric drive machine inverter
A piloted manual gearbox ECU TCU (Transmission Central Unit)

N.B. : The piloted manual gearbox with hybrid double clutch provides the best optimisation in terms of compacting and cost.

Refer to the launch bulletin for the e-DCT6-type piloted manual gearbox with hybrid double clutch.

4.3. Electrical components

4.3.1. Traction battery

Based on the Li-ion technology, the complete battery pack includes :

The traction battery modules
The cooling
The tray
The traction battery ECU BMS (Battery Management System)

Supplier: FINDREAM (Ex BYD).

Traction battery :

E : Platform EMP2
F : Platform CMP

Platform	EMP2	CMP
Configuration	1P12S
Cellular chemistry	NCM
Dimensions	382.3 x 284.3 x 102 mm	280 x 345.8 x 154 mm
weight	12.1 ± 0.3 kg	12.6 ± 0.3 kg
volume	7.4L	6.5L
Nominal voltage	43.8V
Capacity	Capacity greater than 20,5 Ah
On-board energy	897.9 Wh
Useable energy	432 Wh
Volume density	121.3 Wh/L	138.1 Wh/L
Mass density	73 Wh/kg
Protection index	IP67
Cooling system	Liquid
Location	At the front left seat, under the floor	Under the front left seat, in the passenger compartment, above the floor
Interfaces	48 V connector : Screwed on the front face	48 V connector : On the left-hand side
	Signal connector : On the side	Signal connector : On the left-hand side
	Cooling system : At the rear	Cooling system : On the lower face

N.B. : View of the location of the traction battery on the EMP2 platform.

(4) Traction battery with integrated cooling (48 V FINDREAM water cooling battery)( Underbody screen not represented).

The traction battery has been designed to have a service life identical to the vehicle.

Until the end of its service life, the traction battery and the hybrid strategy will provide the customer with all of the hybrid functions such as fully electric driving and fuel savings.

The useful energy range is between 25% and 75% of the on-board energy to take into account cellular ageing and destruction.

A minimum of 30% of the useful energy is retained for cold starts or restarting after a long period of immobilisation.

N.B. : The fuses and relays are integrated in the traction battery and will be able to be replaced in the near future.

N.B. : The traction battery does not require any maintenance.

N.B. : It is possible to charge the traction battery in the vehicle, in the ignition positive position, via the 12 V ancillaries battery, using an external charger delivering at least 20 A.

4.3.2. 48 V starter

48 V starter :

E : Platform EMP2
F : Platform CMP

The 48 V starter assists the electric drive machine for cold starting of the internal combustion engine.

The 48 V starter restarts the internal combustion engine during driving phases.

Unlike a conventional reversible alternator, the 48 V starter does not manage either the electric assistance for the internal combustion engine or the current generator function.

These functions are provided by the electric drive machine.

48 V starter

Description	Value
Power	2 kW
Voltage	48V
Cooling system	Air

4.3.3. DC/DC direct voltage transformer

The MHEV (Mild Hybrid Electrical Vehicule) mild hybrid technology has two electrical circuits :

A 12 V ancillaries circuit for the vehicle functions
A 48 V drive circuit for the power train

The electrical power is produced by the electric drive machine; it is only the DC/DC direct voltage transformer that enables the transfer of energy from the 48 V circuit to the 12 V circuit.

DC/DC direct voltage transformer :

E : Platform EMP2
F : Platform CMP

DC/DC direct voltage transformer

Description	Value
Maximum power	2,5 kW
Input	48V
Output	12V
Cooling system	Liquid

When the traction battery charge status (SOC) is very low, the DC/DC direct voltage transformer has been designed to transfer energy from the 12 V circuit to the 48 V circuit.

In this case, the vehicle can be started after charging the traction battery via the 12 V ancillaries battery, using an external charger delivering at least 20 A (Refer to the procedures available on the manufacturer’s aftersales documentation portal).

4.3.4. Ancillaries battery

Located in the engine compartment, the ancillaries battery ‎ supplies the on-board computers. Refer to the specific procedures or the general principles of operation (GPO) on the manufacturer’s aftersales documentation portal.

(6) Ancillaries battery.

(7) Engine management ECU.

(13) DC/DC direct voltage transformer.

4.3.5. 48 V drive circuit

(4) Traction battery with integrated cooling (48 V FINDREAM water cooling battery).

(5) EB2LT engine (Generation 3).

(9) 48 V starter.

(10) e-DCT6-type hybrid double-clutch piloted manual gearbox.

(13) DC/DC direct voltage transformer.

(15) Earth.

(16) Junction box JB (Junction Box).

(17) Passenger compartment air heating resistor (CTP) (Only on the EMP2 platform/Very cold country).

N.B. : On the CMP platform, the heater matrix is supplied with 12 V as on internal combustion engine vehicles, without a passenger compartment air heating resistor (CTP) (17).

4.4. Cooling of the electrical components

With the exception of the 48 V starter and the passenger compartment air heating resistor (CTP), all electrical components in the 48 V drive circuit are cooled using coolant with a heat exchanger (heat exchanger between the refrigerant and the coolant), even if the passenger compartment air conditioning A/C is deactivated.

The cooling system also uses the natural heat exchanging of pipes, in all weather conditions, to achieve perfect operation of the vehicle even if the heat exchanger is faulty.

(g) Air conditioning circuit.

(j) Traction battery cooling circuit.

(2) Traction battery cooling circuit coolant pump.

(4) Traction battery.

(12) Coolant - air conditioning heat exchanger .

(13) DC/DC direct voltage transformer.

(17)Passenger compartment air heating resistor (CTP) (Only on the EMP2 platform/Very cold country).

(18) Air conditioning condenser.

(19)Solenoid valve.

(20) Air conditioning evaporator.

(21) Air conditioning compressor.

(22) Traction battery cooling circuit temperature sensor.

(23) Temperature sensor for the "freezing point" integrated in the traction battery.

(24) Electric drive machine inverter.

(4) Traction battery.

(5) EB2LT engine (Generation 3).

(7) Engine management ECU.

(12) Coolant - air conditioning heat exchanger .

(13) DC/DC direct voltage transformer.

(18) Air conditioning condenser.

(20) Air conditioning evaporator.

(21) Air conditioning compressor.

(25) Expansion tank.

(26) heat exchanger.

(27) Engine cooling radiator .

Refer to the specific procedures or the general principles of operation (GPO) on the manufacturer’s aftersales documentation portal.

CAUTION : The drive train cooling circuit and the heating circuit have the same expansion chamber. Draining one of the ‎2 circuits requires the second to be drained.

CAUTION : Specific interventions are required when replacing the coolants of the different circuits. Refer to the procedures available on the manufacturer’s aftersales documentation portal.

ESSENTIAL : Only fill the cooling circuit with the aid of a vacuum extraction tool.

4.5. Operating temperature

Description of the various alerts on the instrument panel relating to the temperature of the traction battery.

Man-machine interface (IHM) - Driver information

Temperature	warning lamps	Messages
Above 65 °C		STOPHybrid system fault
Between 65 and 62 °C		Hybrid system too hot
Between 62 and 40 °C		Hybrid system unavailable
Between 40 and -30 °C		Hybrid system operational

N.B. : The vehicle puts itself into safety mode if the temperature of the traction battery exceeds 65°C.

5. Diagnostic info

5.1. Replacement of parts

The MHEV (Mild Hybrid Electrical Vehicule) mild hybrid vehicles are fitted with a battery charge status unit (BECB) (Generation 4) .

If the ancillaries battery or the battery charge status unit (BECB) is replaced, manually enter the code written on the ancillaries battery label using the diagnostic tool.

N.B. : For ancillaries batteries which do not have a code on the label : Refer to the table of correspondence available on the diagnostic tool screen when replacing the part.

5.2. Downloading

For the MHEV (Mild Hybrid Electrical Vehicule) mild hybrid technology, software version upgrades, via ECU downloads, must be done with "full configuration".

N.B. : The configuration changes must be carried out as part of a campaign using a dedicated script.

5.3. After-sales operations

Bleeding of the traction battery cooling circuit must be carried out with the diagnostic tool.

6. Authorisations and repairs

6.1. Authorisation

N.B. : No authorisation required below 60 V.

Electrical isolation for a voltage lower than 60 V is not necessary, however the work on the 48 V electrical supply system increases the risks of aggravated short circuit :

Risk of fouling between the 48 V drive circuit and the body
Risk of fouling between the 48 V and 12 V circuits

N.B. : Check that the vehicle is not powered.

ESSENTIAL : Electrical authorisation is not necessary, however you must have completed the 2 distance learning modules (FAD) on the concepts and hazards of electricity.

STELLANTIS groupe training path :

Concept of electricity and fundamental laws : TG014721W01 (FAD)
The dangers of electricity : TG014321W01 (FAD)

6.2. Repair

Switching the vehicle’s power off : For more information, please refer to the procedures available on the manufacturer’s aftersales documentation portal.

ESSENTIAL : During painting work, the temperature of the paint booth must not exceed 70°C with a maximum duration of 60 minutes if the traction battery is present in the vehicle.

ESSENTIAL : Lock out the vehicle before carrying out any cutting, drilling, welding or painting. The functions of the traction circuit could be activated while the vehicle is in standby mode.

N.B. : Depending on the nature of the repair, an operator can work on a vehicle being charged. For example : Replacement of the brake pads.

7. Special tools

None.

8. Training for the aftersales activity

Only one distance learning module is planned.

Distance learning TG504153V01 available on the brand network training website.

Aim of the function :

Be able to describe the MHEV (Mild Hybrid Electrical Vehicule) mild hybrid technology
Identify a vehicle which has the MHEV (Mild Hybrid Electrical Vehicule) mild hybrid technology
Name the benefits of this technology
Summarise the use of the Miller cycle on the EB2 internal combustion engine(Generation 3)
List the components of the MHEV (Mild Hybrid Electrical Vehicule) mild hybrid drive train
Distinguish between the operating phases
Differentiate between the electrical and electronic circuits

9. Aftersales documentation

The vehicle’s technical documentation can be consulted on the manufacturer’s Aftersales documentation portal :

‎1 month before the commercial launch, for the replacement parts catalogue, the new vehicle preparation (PDI) and the general principles of operation
From the commercial launch, for the repair methods

CAUTION : The document references available on the different servers are valid only after the launch. Document references may change during the life of the vehicle.

10. New vehicle preparation (PVN)

N.B. : No checks on the traction battery for MHEV (Mild Hybrid Electrical Vehicule) vehicles.

11. Maintenance

The special features of vehicle servicing relating to the MHEV drive train concern :

Replacement of the ancillary drive belt
The air conditioning compressor
The 48 V starter

12. Countryside

No special feature for this vehicle.

13. Escalation of customer incidents

Refer to the document "Organisation bulletin: feedback to customers" for the vehicle. On the manufacturer’s aftersales documentation portal : "DOCUMENTATION" tab ↦Vehicle / General ↦Repair procedures ↦Data - Identifications.

14. Technical assistance

The "Dealer Issue Detection Assistance" (DID-A) is used to contact technical assistance. Observe the DID standards (Manufacturer’s aftersales documentation portal : "Incidents-Assistance" tab ↦DID practical information ↦DID standards) :