01 Engine sporadically difficult to start - 4.0TFSI
01 18 73 2046724/6 May 24, 2018. Supersedes Technical Service Bulletin Group 01 number 18-54 dated
February 14, 2018 for reasons listed below.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

RS 7

2014 - 2018

All

4.0 TFSI

A8, S6, S7,
and S8

2013 - 2018

All

4.0 TFSI

RS 7+, S8+

2016 - 2018

All

4.0 TFSI

Condition
REVISION HISTORY
Revision

Date

Purpose

6

-

Revised Service (Updated Step 2)
Revised Warranty (Added Labor Operation)

5

02/04/2018

Revised Warranty (Added Note)

4

10/04/2017

Revised header data (Added MY18)
Revised Service (Added note)

Customer statement:
 The engine sporadically does not start after reaching operating temperature and being parked for longer
stationary periods (engine not completely cooled down). However, the starter motor will turn over normally.
 The engine sporadically does not start or only after long cranking period then runs rough for a few seconds
(starter motor turns normal).
Workshop findings:
 Usually there are no DTCs in engine control module (ECM), J623 (address word 0001).
Or
 Sometimes a DTC about fuel metering system "System too rich" will appear in the engine control module
(ECM), J623 (address word 0001).

Technical Background
Deviation in fuel-air mixture at engine start.

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© 2018 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.

Production Solution
Not applicable.

Service
Perform the following checks:
1. Read the DTC memory of the ECM.
2. Read/assess the measured value with the ODIS measured value identifier IDE09529 "Fuel mass flow
fumigation from engine oil". Warm up the engine at idle speed and observe the above measured value
together with the engine oil temperature. The evaporation process of fuel in the engine oil starts at about
122°F engine oil temperature.
a. If the value of the fuel mass flow is at least intermittently above 75 mg/s, this clearly points to a high fuel
share in the engine oil (over 0.5 l). In this case, the condition is caused by an extreme short distance
operation profile of the customer. We recommend to change the engine oil with filter and to explain the
background to the customer. Update the ECM with SVM code 01A225.
b. If the limit of 75 mg/s is not exceeded and the condition cannot be reproduced, the driving profile of the
customer before the workshop visit may have completely consumed the fuel in the engine oil. In this case,
we also recommend to enquire about the driving profile of the customer for a possible explanation. In this
case, also update the ECM with SVM code 01A225 and change the engine oil with filter.
In addition check the following fuel pressure values:
1. Check the holding pressure of the high and of the low pressure fuel pump (fuel pump for pre-supply G6) at
room temperature (about 64-68°F):
 Warm up the engine to an oil temperature of at least 176°F and read the following measured values:
 IDE00186 low fuel pressure, actual value
 IDE00188 high fuel pressure, actual value
 IDE06212 fuel pressure high-pressure accumulator 2
 Observe the development of the high fuel pressure after switching off the engine (required pressure
development: gradual rise to about 80 bar in 10 minutes). If the pressure development is different, the
cause of the condition can be a leaking high pressure fuel injector. In this case, borescope the combustion
chamber to determine if there is a leak from one of the high pressure fuel injectors.
 Also, observe the pressure build-up of the low fuel pressure after switching off the engine. In the first five
minutes the low pressure must rise above 6 bar and the pressure must be held for another 10 minutes. If
the low fuel pressure was built up correctly but drops by more than 1.5 bar in the first 15 minutes, it can be
assumed that at least one of the high-pressure fuel pumps is leaking. In this case, replace both highpressure fuel pumps and change the engine oil.
SVM Update Instructions
1. Follow all instructions in TSB 2011732: 00 Software Version Management (SVM), operating instructions.

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© 2018 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.

2. Update the ECM, J623 (address word 0001) using the SVM action code as listed in the table below if
necessary:

Model

Engine

Old Software
Part Number

Old Software
Version

New Software
Part Number

New
Software
Version

SVM Code
Input

(or higher)
S6/S7 MY13

CEUC

4G0906014

0011

4G0906014

0012

01A225

S6/S7 MY13

CEUC

4G0906014A

0007

4G0906014A

0008

01A225

S6/S7 MY13

CEUC

4G0906014B

0008

4G0906014B

0009

01A225

S6/S7 MY14

CEUC

4G0906014E

0005

4G0906014E

0006

01A225

S6/S7 MY15

CEUC

4G0906014E

0005

4G0906014E

0006

01A225

S6/S7 MY16

CTGE

4G0906014C

0005

4G0906014C

0006

01A225

S6/S7 MY16-17

CTGE

4G0906014D

0001

4G0906014D

0002

01A225

RS 7 MY14

CRDB

4G0906560A

0005

4G0906560A

0006

01A225

RS 7 MY14

CRDB

4G0906560

0011

4G0906560

0012

01A225

RS 7 MY14

CRDB

4G0906560B

0007

4G0906560B

0008

01A225

RS 7 MY15-16

CWUB

4G0906560D

0001

4G0906560G

0002

01A225

RS 7 MY15-16

CWUB

4G0906560F

0002

4G0906560F

0003

01A225

RS 7 MY17

CWUB

4G0906560G

0001

4G0906560G

0002

01A225

RS 7 MY16-17
Performance

CWUC

4G0906560G

0001

4G0906560G

0002

01A225

A8 4.0TFSI
MY13-14

CEUA

4H0906014

0007

4H0906014

0008

01A225

A8 4.0TFSI
MY13-14

CEUA

4H0906014A

0005

4H0906014A