Service

Technical Information

109/19 ENU

2470

2

Complaint - Check Engine Light Active and Fault Memory Entry "P138800" (TI 109/19)

Vehicle Type:

Macan (95B)

Model Year:

As of 2017 up to 2018

Equipment:

2.0-liter 4-cylinder petrol engine

Subject:

Engine electronics (DME) control unit

Symptom:

Check Engine light active and fault memory entry "P138800 - Control unit faulty"

Cause:

Due to a software error, the fault memory entry "P138800 - Control unit faulty" can be stored
in the engine electronics (DME) control unit in certain driving situations.

Remedial
Action:

Re-program engine electronics (DME) control unit using the PIWIS Tester with test software version
38.600.020 (or higher) installed.

Required tools
Tools:

•
•

Battery charger with a current rating of at least 90 A and - if required - also with a current and
voltage-controlled charge map for lithium starter batteries, e.g. Battery Charger, 90 A
9900 - PIWIS Tester 3 with PIWIS Tester software version 38.600.020 (or higher) installed

Preparatory work
NOTICE
Fault entry in the fault memory and control unit programming aborted due to low-voltage.
•

Increased current draw during diagnosis or control unit programming can cause a drop in voltage, which
can result in one or more fault entries and the abnormal termination of the programming process.



Before commencing work, connect a suitable battery charger with a charging current of at least 90 A to
the jump-start terminals in the engine compartment.
NOTICE

Control unit programming will be aborted if the WLAN connection is unstable.
•

An unstable WiFi connection can interrupt communication between the PIWIS Tester and the vehicle
communication module (VCI). As a result, control unit programming may be aborted.



During control unit programming, always connect the PIWIS Tester to the vehicle communication module
(VCI) via the USB cable.

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NOTICE
Control unit programming will be aborted if the driver's key is not recognized
•

If the driver's key is not recognized in the vehicle, programming cannot be started or will be interrupted.



Place the driver's key with the back facing down into the front left storage compartment in the center
console to guarantee a continuous radio link between the vehicle and the driver's key.

Re-programming engine electronics (DME) 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
programming or coding.

Information
The procedure described here is based on the PIWIS Tester 3 software version 38.600.020.
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

Re-program engine electronics (DME) control unit.
The basic procedure for programming a control unit is described in the Workshop Manual - 
Workshop Manual '9X00IN Basic instructions and procedure for control unit programming using the
PIWIS Tester - section on "Programming"'.
For specific information on control unit programming during this campaign, see table
below.
Required PIWIS Tester software version:

38.600.020 (or higher)

Type of control unit programming:

Control unit programming using the 'Automatic
programming' function of the control unit.
Select the Engine electronics (DME) control unit
in the control unit selection screen and re-program
it using the 'Coding/Programming' menu and the
'Automatic programming' function.

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Technical Information

109/19 ENU

2470

2

Read and follow the information and instructions
on the PIWIS Tester during the guided
programming sequence.
The engine electronics (DME) control unit
and the PDK control unit are re-programmed
and then re-coded automatically during the
programming sequence.

Programming sequence:

Do not interrupt programming and coding.
Once the control units have been programmed
and coded, the PIWIS Tester will prompt you to
switch the ignition off and then back on again after
a waiting time of approx. 10 seconds.
Procedure in the event of error messages
appearing during the programming
sequence:

 Workshop Manual '9X00IN Basic instructions and

Procedure in the event of abnormal
termination of control unit programming:

Repeat control unit programming by restarting
programming.

procedure for control unit programming using the
PIWIS Tester - section on "Fault finding"'.

Information
Specifications for the new software version and identifying features on the vehicle
The software versions that are re-programmed during this programming step can be read out of the DME
and PDK control unit in the 'Extended identifications' menu using the PIWIS Tester.
Overview of the new software versions for the DME and PDK control unit:
Emissions concept:

Control unit

during this
campaign:

Software version:

R4 TFSI ULEV NAR

Engine electronics
(DME)

95B.906.259.D

0004

PDK control unit

95B.927.156.BQ

0022

Concluding work
Work Procedure: 1

Read out and erase the fault memories of all control units.
1.1

Press •F7“ in the control unit selection screen ('Overview' menu) to call up the Additional
menu.

1.2

Select the function "Read all fault memories and erase if required" and press •F12“ ('Next')
to confirm.
The fault memories of the control units are read out.

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1.3

Once you have read out the fault memories, check the fault memory entries.
Information
If control units are found to have faults that are not caused by control unit programming,
these must first be found and corrected. This work must be invoiced using a separate
warranty claim.

1.4

Press •F8“ to delete fault memory entries.

1.5

Press •F12“ ('Yes') in response to the question as to whether you really want to delete all
fault memory entries.
The faults stored in the fault memories of the various control units are deleted.
Information
If fault memory entries for individual control units cannot be deleted, proceed as follows:

1.6

2

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•

Switch off the ignition.

•

Disconnect the PIWIS Tester diagnostic connector from the diagnostic socket.

•

Lock the vehicle using the driver's key.

•

Wait approx. 1 minute before unlocking the vehicle again.

•

Start the engine, leave it running for a short time and then stop it again.

•

Switch off the ignition and wait approx. 10 seconds before switching it back on again.

•

Plug the PIWIS Tester diagnostic connector into the diagnostic socket again and restore
communication with the vehicle.

•

Read out the fault memory again and delete any fault memory entries that are stored.

Once you have erased the fault memories, select the 'Overview' menu to return to the
control unit selection screen.

Perform adaptations.
2.1

Select the 'Engine electronics (DME)' control unit in the control unit selection screen
('Overview' menu) and press •F12“ ('Next') to confirm your selection.

2.2

Once the DME control unit has been found and is displayed in the overview, select the 'Maintenance/repairs' menu.

2.3

Select menu item 'Adaptations' and press •F12“ ('Next') to confirm your selection.

2.4

Comply with the displayed preconditions and press •F12“ ('Next') to confirm.

2.5

Select 'Throttle valve' in the overview of adaptations and press •F8“ ('Start') to start the
adaptation.

2.6

Follow the instructions on the PIWIS Tester while throttle valve adaptation is being performed.

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Technical Information

109/19 ENU

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Once the adaptation is completed successfully, a tick will appear in the "Status" field for the
throttle valve on the PIWIS Tester display.
If throttle valve adaptation is not completed successfully, adaptation must be repeated.
2.7

End throttle valve adaptation by pressing •F8“ ('Stop').

2.8

Select 'Radiator shutter' in the overview of adaptations and proceed as described in steps
2.5 to 2.7 in order to adapt the throttle valve.

2.9

Press •F11“ ('Back') to return to the start page of the 'Maintenance/repairs' menu.

3

Select the 'Overview' menu and press •F11“ ('Back') to return to the control unit selection screen.

4

Switch off the ignition.

5

Disconnect the PIWIS Tester from the vehicle.

6

Switch off and disconnect the battery charger.

Invoicing
Invoicing:

The work involved is invoiced under the labor operation:
I No.

APOS

Labor operation

24702540

Programming DME control unit (60 TU)
For invoicing and documentation using PQIS, enter the following coding:

Location (FES5)

2470

DME control unit

Damage type (SA4)

3013

Damaged

References:

 Workshop Manual '9X00IN Basic instructions and procedure for control unit programming using the
PIWIS Tester'

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. Part numbers listed in these bulletins are for reference only. 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.

© 2020 Porsche Cars North America, Inc.

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