122-Z6W8C-07

Service
Technical Information
129/15 ENU
2X00
2
Operating Principle of HV System (129/15)
Vehicle Type:
Panamera S E-Hybrid and Cayenne S E-Hybrid
Model Year:
As of 2014
Subject:
Operating principle of HV system
Information on the discharge protection function of the battery management system (BMS)
Subject:
Discharge protection function of the battery management system (BMS) in order to extend the
service life of high-voltage and low-voltage batteries
Note:
The Panamera S E-Hybrid and Cayenne S E-Hybrid models offer a completely new driving experience
thanks to their increased electric range and the newly developed lithium-ion high-voltage battery with its
high energy density and power density.
To maintain this over the service life of the vehicle, it is important - among other things - to prevent
damage to the high-voltage battery as a result of exhaustive discharge. For this purpose, the S E-Hybrid
models have an energy management system and an operating strategy, which control the state of charge
of the battery and the flow of energy in the vehicle electrical system.
If the state of charge of the high-voltage battery or low-voltage battery reaches certain discharge
thresholds, the energy management system controls the flow of current in the vehicle in such a way that
further discharge of the two batteries is prevented.
Background:
Under normal operating conditions, the energy management system and operating strategy control the
charging and discharge processes in the high-voltage system and in the low-voltage vehicle electrical
system in order to prevent a critical state of charge in one of the two batteries. To do this, the operating
strategy can start the combustion engine, for example, in order to charge the high-voltage battery or
actively recharge the low-voltage battery from the high-voltage system.
However, if one of the two batteries reaches a critical state of charge because of a malfunction or
because the vehicle was parked up for a very long time, various measures are also used to prevent
exhaustive discharge. These measures are activated and controlled by the battery management system
(BMS) depending on the actual discharge threshold.
The discharge thresholds of the high-voltage and low-voltage battery are categorised as follows:
•
High-voltage battery
Warning threshold (state of charge approx. 12% *)
•
•
•
All high-voltage components are switched off.
Fault entry "P0A7D00 "High-voltage battery – state of charge (SOC) too low" in the fault
memory of the high-voltage battery control unit.
0 km (0 miles) electric range shown in the instrument cluster.
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Technical Information
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
Purely electric driving is no longer possible once the warning threshold is reached.

The remaining capacity of the high-voltage battery is sufficient to start the combustion engine.
Alarm threshold (state of charge approx. 8% *)
•
•
•

Yellow warning message "Hybrid system fault" is displayed in the instrument cluster.
Fault entry P0A7D00 "High-voltage battery, state of charge (SOC) – below limit value" in the
fault memory of the high-voltage battery control unit.
High-voltage contactors are opened (this disconnects the high-voltage battery from the
vehicle electrical system).
After the ignition is switched off and on again, the combustion engine can be started.
Error threshold (state of charge approx. 6% *)
•
•
•

Red warning message "Hybrid system fault" is displayed in the instrument cluster.
Fault entry P0A7D00 "High-voltage battery, state of charge (SOC) – fault" in the fault memory
of the high-voltage battery control unit.
The high-voltage system is switched off completely.
The vehicle cannot be driven again until the high-voltage system is reactivated.
* The specified values relate to the absolute state of charge. The actual usable state of charge range
for customers is less than the absolute range because of battery technology. For example, an
absolute state of charge of approx. 15% corresponds to a customer state of charge of approx. 0%.
•
Low-voltage battery
Discharge threshold 1 (state of charge approx. 12%)
•
Interior lighting is switched off.
Discharge threshold 2 (state of charge approx. 8%)
•
•

Ignition is switched off (term. 15).
Emergency lighting remains active.
After the ignition is switched off and on again, the combustion engine can be started.
Discharge threshold 3 (state of charge approx. 4%)
•

The low-voltage battery is disconnected from the vehicle electrical system (term. 30 is
switched off).
The vehicle cannot be driven again until the low-voltage system is reactivated.
If one of the three fault entries mentioned above occurs on the high-voltage battery, the cell
voltage of the high-voltage battery must be read out:
Work Procedure: 1
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Connect a battery charger or power supply, suitable for AGM type batteries, recommended current
rating of 70A fixed voltage 13.5V to 14.5V to the jump-start terminals in the engine compartment.
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Technical Information
129/15 ENU
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2
9900 - PIWIS Tester III must be connected to the vehicle communication module (VCI) via the USB
cable. Then, connect the communication module to the vehicle and switch on the PIWIS Tester.
3
Switch on the ignition.
4
Switch to the Control unit selection menu in 9900 - PIWIS Tester III.
5
Select the high-voltage battery in the Control unit selection menu.
Information
6
Switch to the Actual values/input signals tab and display the Momentary minimum cell
voltage: Voltage.
To reactivate vehicles with a flat high-voltage or low-voltage battery, complete the following
steps:
Work
Procedure:
•
High-voltage battery
1
Connect Porsche Universal Charger (high-voltage) to the vehicle and the power supply. Start
charging the high-voltage battery on the Porsche Universal Charger (high-voltage).
2
Connect a battery charger or power supply, suitable for AGM type batteries, recommended current
rating of 70A fixed voltage 13.5V to 14.5V to the jump-start terminals in the engine compartment.
3
9900 - PIWIS Tester III must be connected to the vehicle communication module (VCI) via the USB
cable. Then, connect the communication module to the vehicle and switch on the PIWIS Tester.
4
Switch on ignition. Read out and erase the fault memories of all control units using the PIWIS Tester.
Then, switch off the ignition and disconnect the PIWIS Tester from the vehicle.
5
Switch off the battery charger (low-voltage) and disconnect it from the jump-start terminals in the
engine compartment.
6
Continue to charge the high-voltage battery using the Porsche Universal Charger (high-voltage) until a
state of charge of at least 30% appears on the charger display.
7
Lock the vehicle and unlock it again after a waiting time of at least 5 minutes.
The waiting time allows all vehicle systems to enter sleep mode so that automatic on-board
diagnosis of the hybrid system can be carried out.
The vehicle cannot be started until on-board diagnosis is completed successfully.
8
End the charging process on the Porsche Universal Charger (high-voltage) and disconnect the
charger from the vehicle.
9
Calibrate electric machine.
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Procedure:
Technical Information
ENU 129/15
9.1
Press the brake pedal and keep it pressed.
9.2
Turn the ignition key in the ignition lock to position 2 (terminal 50 – engine start) and hold it at
this position for about 2 to 3 seconds.
Calibration of the electric machine is clearly audible. Calibration is complete once the calibration noise can no longer be heard.
9.3
Release the ignition key and switch off ignition.
9.4
Turn the ignition key in the ignition lock to position 2 (terminal 50 – engine start) again to start
the engine.
•
Low-voltage battery
1
Connect a battery charger or power supply, suitable for AGM type batteries, recommended current
rating of 70A fixed voltage 13.5V to 14.5V to the jump-start terminals in the engine compartment
and charge the low-voltage battery.
2
Switch on the ignition and wait approx. 2 seconds before switching it off again.
3
Lock the vehicle and unlock it again after a waiting time of at least 5 minutes. Start the vehicle.
The waiting time allows all vehicle systems to enter sleep mode so that automatic on-board
diagnosis of the hybrid system can be carried out.
The vehicle cannot be started until on-board diagnosis is completed successfully.
4
Switch off and disconnect the battery charger (low-voltage).
Information
If the battery management system detects a flat low-voltage battery (discharge threshold 3), the
low-voltage battery is disconnected from the vehicle electrical system to protect against exhaustive
discharge.
Learning and adaptation values stored in the control units can therefore be deleted when discharge
threshold 3 is reached.
5
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Restore the learning and adaptation values of the control units  Workshop Manual '2X00IN Work
instructions after disconnecting the battery'.
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Technical Information
129/15 ENU
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2
Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training
courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special
tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the
safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and
safely. If a particular condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your authorized Porsche Dealer for the latest information
about whether a particular technical bulletin applies to your vehicle. Part numbers listed in these bulletins are for reference only. Always check with your authorized Porsche dealer to verify the current and
correct part numbers. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a discrepancy, the work procedures in the PIWIS
Tester are the ones that must be followed.
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