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TOPIC : VW

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Clicking VW TDI

This bulletin applies to Volkswagen vehicles equipped with a TDI diesel engine, such as the 2012 Eos. Under certain conditions, you may hear the glow plug relay J52 clicking on and off after the engine is started.

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Some Diagnostics Hurt Your Brain... Fixing Difficult and Perplexing Problems

I enjoy working through diagnostics, with my favorite being driveability concerns. The most common diagnostics that I perform relate to check engine lights, and lately some of those have been very challenging.

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VW TDI Glow Plug Relay Test

This bulletin applies to all Volkswagen vehicles equipped with TDI diesel engines. Prior to replacing the glow plug relay (038 911 253), perform the following test:

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Touareg Hitch

When installing a trailer hitch on a 2007 and later VW Touareg 2, the early version of the instructions may have left out a step. The instruction should read to install an additional fuse in position SC41 on the right side of the dash. If this fuse is not installed, the trailer module may display a terminal 15 implausible signal fault code and some trailer lamps will not function.

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TDI Coking

In the event that a Volkswagen TDI arrives at your shop with the intake manifold coked with carbon, be sure to check the start of injection (01-Engine Electronics-Basic Settings-Group 000).

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Fuel-Sucking Sensor

This bulletin applies to 2008 Volkswagen Passat models equipped with a 3.6L engine. Due to fuel intrusion into the low pressure side fuel pressure sensor G410, a false signal may be sent to the ECM, resulting in a reading that is out of tolerance. A false signal may result in the MIL on and DTC P129F or P310B stored in the fault memory.

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Anemic VW TDI

If you receive a complaint from a Volkswagen owner of low power with a TDI engine, check the mass airflow sensor reading in the measuring block, group 00, field 10.

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Volkswagen TDI long crank

This bulletin applies to 2008 Volkswagen Jetta Sedan models. In the event you have a TDI engine with a customer complaint of a hard start or long cranking time, check the cranking rpm.

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VW ABS glitch

This bulletin applies to 2009 Volkswagen Touareg vehicles. When diagnosing MK60 ABS fault codes 00688 (terminal 30 voltage) and 01276 (ABS hydraulic pump), perform voltage drop tests on the two main power and ground wires at the ABS module (pins 1 and 32; 47 & 16).

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Diesel-off whine

This bulletin applies to 2009 VW Jetta Sedan GLI (diesel) models. A TDI common rail high pitch whine noise may be heard after switching the ignition to the off position.

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