V231402 2036656

Technical Bulletin
Model(s)
Year
Eng. Code
Trans. Code
VIN Range From
VIN Range To
All
2009-2014
All with TDI
All
All
All
Condition
23 14 02 March 07, 2014 2036656
MIL ON, No Start, or Rough Running with DTCs P0087, P0088 or P0191 Stored in ECM Fault Memory
DTC
Description
P0087
Fuel Rail/System Pressure - Too Low
P0088
Fuel Rail/System Pressure - Too High
P0191
Fuel Rail Pressure Sensor "A" Circuit
Range/Performance
Technical Background
When diagnosing a MIL ON, no-start or rough running concern on a common rail diesel vehicle, and no root cause
is found after following all GFF diagnostic procedures, it may be necessary to check for metallic particles in the
High Pressure Fuel Pump.
If such an inspection is necessary, the following guidelines must be observed when removing the N290 Fuel
Metering Valve.
Page 1 of 6
© 2014 Volkswagen Group 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 Volkswagen Group 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.
Technical Bulletin
Production Solution
No production change required.
Service
Note:
Removing the N290 Fuel Metering Valve to inspect for metallic particles should only be considered as a last step
after all GFF diagnostic procedures have been performed. This includes testing supply pressure to the high
pressure fuel pump (low pressure side), and checking for internal leakage from the injectors and the N276
Pressure Regulating Valve
Note:
Prior to removing the N290 Fuel Metering Valve, the
area surrounding the valve (Figure 1) must be clean
and dried with compressed air to remove ALL debris
from the area. See Repair Manual Group 20 Fuel
Supply, General Information, Clean Working
Conditions in Elsa.
If debris enters the fuel system, components may be
damaged.
Figure 1. Surrounding Area
Page 2 of 6
© 2014 Volkswagen Group 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 Volkswagen Group 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.
Technical Bulletin
1. Remove the N290 Fuel Metering Valve and inspect
the valve and valve bore for the presence of metallic
particles (see Figure 2).
Figure 2. N290 Fuel Metering Valve and Valve Bore
2. If metallic particles are found on the N290 Fuel Metering Valve or in the valve bore, proceed to step 5.
If no metallic particles are found on the N290 Fuel Metering Valve or in the valve bore, do not replace the high
pressure fuel pump. Reinstall the valve and continue with the diagnosis.
Note:
To prevent fuel system damage, ensure that the N290
Fuel Metering Valve is free of any contaminates before
reinstalling.
Prior to reinstallation of the N290 Fuel Metering Valve,
ensure that both O-rings are not damaged. If they are
damaged, the high pressure fuel pump must be
replaced.
To prevent damaging the O-rings when reinstalling the
N290 Fuel Metering Valve, lubricate the O-rings with
diesel fuel (see Figure 3).
Figure 3. N290 Fuel Metering Valve O-rings
3. Install the N290 Fuel Metering Valve into the valve bore using light pressure.
Page 3 of 6
© 2014 Volkswagen Group 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 Volkswagen Group 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.
Technical Bulletin
4. Install and hand tighten both M5 fasteners, ensuring that the threads are clean and dry.
Pre-tighten to 2 Nm, then to 6.5 – 7 Nm.
Note:
Using a paint marker or equivalent, mark the top of the
N290 Fuel Metering Valve with a white dot as shown in
figure 4.
Tip:
Be sure to include the 7 digit technical bulletin number in
the repair order comments.
Figure 4. White dot on N290 Fuel Metering Valve
5. If metallic particles are found on the N290 Fuel Metering Valve or in the valve bore, open a VTA ticket and
contact the Volkswagen Technician Helpline before continuing with the repair. Clear pictures showing the
metallic particles in the N290 Fuel Metering Valve and bore, as well as the GFF diagnostic log are required
to continue with diagnosis and/or release of the High Pressure Fuel Pump. Reference the pictures below for
examples. (see Figures 5 & 6).
Page 4 of 6
© 2014 Volkswagen Group 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 Volkswagen Group 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.
Technical Bulletin
Tip:
Prior to calling the Technician Helpline, have the
pictures and the GFF log attached to the VTA ticket.
This will help to ensure a timely repair.
Figure 5. N290 Fuel Metering Valve with Metal Particles
Note:
If a fuel system replacement is necessary, ensure that
the fuel injector return line is properly seated and
sealed once installed. Inspect for seepage at the fuel
injector return line connector after the test drive. If
seepage is found, the condition must be corrected.
Figure 6. Valve Bore with Metal Particles
Tip:
Be sure to include the 7 digit technical bulletin number in the repair order comments.
All TDI Clean Diesel High Pressure Fuel Pumps which have been replaced, are to be returned to the
Volkswagen Warranty Parts Return Center in Auburn Hills, MI. All pumps will be inspected to verify the
presence of metallic particles on the N290 Metering Valve and within the bore.
Page 5 of 6
© 2014 Volkswagen Group 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 Volkswagen Group 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.
Technical Bulletin
Warranty
Information Only.
Required Parts and Tools
Information Only.
Additional Information
All part and service references provided in this Technical Bulletin are subject to change and/or removal.
Always check with your Parts Dept. and Repair Manuals for the latest information.
Page 6 of 6
© 2014 Volkswagen Group 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 Volkswagen Group 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.