122-F3A8L-09

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Technical Information
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WG38 - Re-coding Gateway Control Unit (Workshop Campaign)
Important:
CRITICAL WARNING - This campaign includes steps where control unit(s) in the vehicle will be
programmed with the PIWIS Tester. The vehicle voltage must be maintained between 13.5 volts and 14.5
volts during this programming. Failure to maintain this voltage could result in damaged control unit(s).
Damage caused by inadequate voltage during programming is not a warrantable defect. The technician
must verify the actual vehicle voltage in the PIWIS Tester before starting the campaign and also document
the actual voltage on the repair order. Please refer to Equipment Information EQ1401 for a list of suitable
battery chargers/power supplies which should be used to maintain vehicle voltage.
Model Year:
As of 2014 up to 2016
Vehicle Type:
911 GT3 (991)/911 GT3 RS (991)
Cayman GT4 (981)
Equipment:
Lightweight battery (lithium-ion battery), I-no. 192
Subject:
Gateway control unit
Information:
Due to a software error in the gateway control unit, the optional lightweight battery (lithium-ion
battery) - if installed in the vehicle - will not charge using the Porsche Charge-o-mat Pro
charger when this is used via the cigarette lighter or 12-volt plug socket in the vehicle.
As a result, the lightweight battery can go flat if the vehicle is parked up for a long time.
The charging function works, however, if the charger is connected directly to the vehicle battery using the
optional clamp adapter.
Remedial
Action:
Re-code the gateway control unit using the PIWIS Tester with software version 33.400.020 (PIWIS Tester
3) or version 17.400.020 (PIWIS Tester II) or a higher software version installed in order to ensure that
the charging function of the Porsche Charge-o-mat Pro also works when connected to the cigarette lighter
or 12-volt plug socket in the vehicle.
Information
For carrying out the measure, it does not matter which starter battery (AGM battery or lightweight
battery) is currently installed in the vehicle.
Affected
Vehicles:
Only the vehicles assigned to the campaign (see also PIWIS Vehicle information). This campaign affects
243 vehicles in North America.
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Required Tools
NOTICE
Use of a PIWIS Tester software version that is older than the prescribed version
•
Measure is ineffective

Always use the prescribed version or a higher version of the PIWIS Tester software for control unit coding.
Tools:
•
•
Battery Charger/Power Supply - Suitable for AGM Type batteries, recommended current rating of
70A fixed voltage 13.5V to 14.5V. Refer to Equipment Information EQ-1105.
9900 - PIWIS Tester 3 with PIWIS Tester test software version 33.400.020 (or higher) installed
or
•
9818 - PIWIS Tester II with PIWIS Tester test software version 17.400.020 (or higher) installed.
Preparatory Work
NOTICE
Coding will be aborted in the event of low voltage.
•
Increased power consumption during diagnosis can cause a drop in voltage, which can result in one or
more fault entries and abortion of the coding process.

Before getting started, connect a suitable battery charger to the jump-start terminals in the engine
compartment.
NOTICE
Exceeding maximum charge voltage and maximum charge current.
•
Risk of damage to the lithium-ion starter battery.

Do not exceed the maximum charge voltage of 13.8 V and the maximum charge current of 40 A.

Only charge the battery using a suitable electronic charger with IU characteristic.
NOTICE
Coding will be aborted if the Internet connection is unstable.
•
An unstable Internet connection can interrupt communication between PIWIS Tester II and the vehicle
communication module (VCI). As a result, coding may be aborted.

During control unit programming, always connect PIWIS Tester II to the vehicle communication module
(VCI) via the USB cable.
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Technical Information
Work Procedure: 1
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Connect battery charger.
First connect the positive cable of the charger to the
positive terminal of the battery and then connect the
negative cable of the charger to the ground point for
jump-lead starting  External power connection.
Information
If a lightweight battery (lithium-ion battery) is installed,
check the following requirements on the battery
charger you are using and also check the required
charging parameters:
•
Only charge the battery using a suitable
electronic charger with IU characteristic that is
suitable for use on a lithium-ion starter battery.
•
Do not exceed the maximum charge voltage of
13.8 V and the maximum charge current of 40 A.
External power connection
2
Switch on the ignition.
3
9818 - PIWIS Tester II with software version 33.400.020 (PIWIS Tester 3) or version
17.400.020 (PIWIS Tester II) or a higher software version must now be connected to the vehicle
communication module (VCI) using the USB cable. Then connect the communication module to the
vehicle and switch on the PIWIS Tester.
4
On the start screen of the PIWIS Tester, call up the  'Diagnostics' menu and select the vehicle
type  '911'  '991'.
The diagnostic application is then started and the control unit selection screen is populated.
Re-code gateway control unit
NOTICE
Use of a PIWIS Tester software version that is older than the prescribed version
•
Measure is ineffective

Always use the prescribed version or a higher version of the PIWIS Tester software for control unit coding.
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Information
The procedure described here is based on the PIWIS Tester II software version 17.400.020.
The PIWIS Tester instructions take precedence and in the event of a discrepancy, these are the
instructions that must be followed.
A discrepancy may arise with later software versions for example.
Work Procedure: 1
Select the  'Gateway' control unit in the control
unit selection screen ( 'Overview' menu) and
confirm your selection by pressing •F12“ ('Next')
 Control unit selection - Gateway.
2
When the question “Create Vehicle Analysis Log
(VAL)?” appears, either press •F12“ ('Yes') to create
a VAL or press •F11“ ('No') if you do not want to
create a VAL.
3
Press •F12“ ('Next') to acknowledge the message
informing you that campaigns for the vehicle are
stored in the PIWIS information system.
4
Once the gateway control unit has been found and is displayed in the overview, select the 
'Codings/adaptations' menu.
5
Select the  'Automatic coding' function and press
•F12“ ('Next') to start coding  Automatic coding.
Control unit selection - Gateway
Automatic coding
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When coding is complete, the message “Coding has
been completed successfully” is displayed and a tick
appears in the 'Status' box  Coding successful.
If coding is not completed successfully (error
message “Coding was not completed successfully”),
coding must be repeated.
7
8
Once coding has been completed successfully, press
•F12“ ('Next') to return to the start page of the 
'Codings/adaptations' menu.
Coding successful
Select the  'Overview' menu and press •F11“ ('Back') to return to the control unit selection
screen.
Concluding work
Work Procedure: 1
Switch off the ignition.
2
Disconnect the PIWIS Tester from the vehicle.
3
Switch off and disconnect the battery charger.
4
Enter the workshop campaign in the Warranty and Maintenance booklet.
Warranty Processing
Scope:
Working time:
Re-coding gateway control unit
Includes:
Connecting and disconnecting battery charger
2016© Porsche Cars North America, Inc.
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Labor time: 15 TU
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Connecting and disconnecting PIWIS Tester
 Damage Code WG38 066 000 1
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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Dealership
Distribution
Routing
Service Manager
_______
Shop Foreman
_______
Service Technician
________
_______
_______
_______
Asst. Manager
_______
Warranty Admin.
_______
Service Technician
________
_______
_______
_______
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