Marty passed along these VW Tech Tips. Note that some are Touareg specific and some are for all VW vehicles and may not relate to the Touareg:
Vehicles with TDI Pumpe Duse Engine, Glow Plug Checking
Do NOT test the glow plugs on these engines by applying battery voltage to see if they glow. They will become damaged or non–functioning in a very short period of time. The correct checking procedure is in VESIS, under the Library tab in Additional Information.
All Touaregs, Headlamp Bulbs (Especially HID)
If headlamp bulbs were originally blue and have turned white after approx. 200 hours, this is normal. Do not replace bulb because of color difference.
ALL Late Model Volkswagen Vehicles, Heated Oxygen Sensors
If you encounter a Heated Oxygen Sensor DTC (front and/or rear) AND the vehicle has less than 2000 miles, drive the vehicle in 3rd gear (under load) for approximately 10 miles. If the O2S DTC(s) do NOT return; release/deliver the car without replacing any parts.
· It is possible that the oxygen sensor(s) in this vehicle became loaded up (unintentionally coated by internal engine component contaminants) due to frequent moving or re-parking the cars at the Port or Dealership multiple times AND improperly heating the engine cooling system to its specified operating temperature.
All Vehicles, Drivability Complaints
When diagnosing customer drivability complaints (i.e., clunking at low speeds, tire scrub, ASR/traction control activating on its own), measure the tire circumference on all four tires. Using a tape measure and chalk, carefully place a perpendicular chalk mark at the bottom of the tire (if this mark were extended it would pass through the center of the axle). Then, mark precisely next to it on the ground. Move the vehicle forward until the tire mark has rotated 360 degrees. Make another chalk mark on the ground adjacent to the tire mark. Measure the distance between the two chalk marks and compare this measurement between all 4 tires. If there is a difference in circumference between the tires that is greater than 13mm (0.5"), swap the wheels and tires from a known good vehicle to verify the cause of the concern.
All Canadian Vehicles Equipped with a Sirius Satellite Radio, GCI Update
With the introduction of a new Canadian weather channel, Canadian receivers will now receive 110 channels. This will require a category reassignment of several channels. As a result, users may experience a few minutes delay in accessing the audio channel lineup and updated category information until the channel map is completely loaded. All receivers will need to load a new channel map (Update GCI) to accommodate the changes.
All Vehicles, Engine Starts/Stalls Prior to Putting Vehicle into Gear wth DTC P1570
If the engine starts then stalls, with DTC P1570 (ECM disabled) in the Engine Control Module, AND there are NO DTCs stored in the Instrument Cluster (Address Word 17):
* Perform a capacitive discharge by disconnecting both cables from the Battery posts
* Firmly contact the cable ends with each other for at least two minutes
* Follow up with a Mid-tronics Battery Test before reconnecting
All Touaregs, Stepper Motor Replacement
If you have a customer complaint of “wheels binding in turns”, do NOT replace any stepper motors or transfer cases. Engineering has developed software to resolve these “binding” complaints. Software level 0122 will be announced in a Technical Bulletin planned for publication release the week of 7-03-06. In the meantime, please advise the customer that a resolution for this complaint will become available within the next two weeks.
All Vehicles with Satellite Radios, Installing IPOD Kits
If you are installing an IPOD kit on a car with a satellite radio, and it already has a blue connector in the Quad Lock connector, you MUST remove Pins 1, 3 and 7 using the proper release tool. Next, insert those pins into the same numbered holes on the connector supplied in the IPOD kit. Finally, attach this connector to the radio.
Note: This procedure can also be found in the instruction manual on Page 14 under “NOTE -Bullet Number 2
2004-2007 Touareg, Shift Lever Button Sticking
Potential symptoms of the shift lever button sticking:
* It will not be possible to pull the key out of the ignition because it’s not contacting the micro switch.
* If the shifter button is stuck all the way in, you can put the vehicle into park, but unless you apply your foot to the brake, it won’t shift out of park.
* If the shifter button cannot be pushed all the way in, the shift lever won’t move through the gears.
If you receive a complaint that the button on the shift lever sticks, carefully remove the chrome disc from the right side of the shift lever using a small flat screwdriver. Before replacing check to see if the black cap is seated properly; if not, properly reposition and check to see if the button sticks. If it is seated properly and the button still sticks, refer to the Repair Manual and replace the shift lever handle assembly.
2004-2005 Touareg with 09D Transmission, Design Change
A heads-up for a design change to these transmissions: newer R21 transmission valve bodies no longer have oil pressure switches installed in them. If you replace a valve body with the newer part number (ending in B for transmissions produced before August 2005) the TCM must ALSO be replaced; otherwise, the MIL lamp will illuminate and oil pressure switch DTCs will be stored (because the switches are no longer installed).
All Touaregs, Steering Column Replacing
When replacing a steering column on a Touareg, be sure that the steering wheel electronics and airbag are installed before trying to adapt it to the Access Control Module. Also ensure that a battery charger is connected to the vehicle during the entire repair.
2004-2005 Touareg, Gearbox DTCs
DTC P0753 (0025
Solenoid Valve N88 Open / Short in Address Word 02 “Gearbox Electronics” can occur on MY 2004 and certain early MY 2005 Touareg vehicles. The root cause of the complaint is that the harness is too short, causing wire strands to break internally within the harness near the T14e connector. Do NOT replace the TCM or the Valve Body for this DTC; instead, perform the following steps:
* Disconnect the T14e connector from the transmission
* Back out pin 1 (yellow) from the T14e connector about 12 inches above the transmission connector
* Butt-splice a new wire from the VAS 1978 Wiring Repair Kit, ensuring an additional 1/2 inch of extra overall harness length.
* Re-pin the wire to the T14e connector and re-attach the harness connector to the transmission
All Vehicles, Sensor Checking
When checking a sensor, perform a local DSO reading at the sensor connectors; then compare the readings with measurements taken at the breakout box sockets. They MUST be the same. If they don’t match, the wiring is suspect.
2004-2007 Touareg, Remote Key
If the MFI display on a Touareg displays "Key not found", check and/or replace the remote battery in the key fob. There is nothing wrong with the key. Do not re-adapt the key set. If you have already tried adapting the keys, further diagnosis will be required. Call the Volkswagen Dealer Technician, Electrical Team (Prompt Number 2) for instructions on how to proceed.
All Vehicles With iPod Connectivity
* It is NOT possible to connect and run an iPod adapter in parallel with a CD changer.
* The iPod adapter is compatible with the following iPod units: 20GB, 30GB, 40GB, 60GB, Nano and Photo.
* The adaptor will NOT work with any iPod having LESS than 20 GB.
2006-2007 Passat B6 and Touareg, Refrigerant Leaks
These vehicles use a dryer cartridge positioned inside the condenser. The dryer opening in the condenser is sealed with a metal plug that is covered by a rubber dust cover. If a leak develops at the plug, refrigerant will escape from the system (but dye will not!). To inspect for leakage, you MUST remove the dust cover from the plug to see if any dye is present
2007 Touareg with New V-10 (engine code BWF), Fuel Pressure Switch Location
The F1 fuel pressure switch is now located under the EGR cooler on the passenger side of the engine.
All Touaregs, Convenience Open/Close Feature Inoperative
If you receive a complaint that the convenience close/open feature for the vehicle windows is inoperative, it is probably a normal condition. This function only works for a limited time after the car has been unlocked and locked using the key fob.
All Touaregs, Vehicle Will Not Crank
When the vehicle is unlocked by using the key in the driver door handle and 15 seconds elapses with out the ignition key being inserted into the ignition switch, the alarm will go off and the start signal will become prohibited. To remedy this outcome, simply insert the ignition key into the ignition switch and turn it counter-clockwise to reset it.
All Touaregs, Flashing Door LED
For complaints where the customer has unlocked the vehicle using a key in the driver door handle (instead of using the remote) and then opens the door to find the LED flashing, this is normal.
All Vehicles with Radio-Navigation RNS2 with CD + DVD, Removing Radio
When removing the Radio/NAV units, ensure that you use the universal radio removal tool T 10057. The use of any tool or device other than T 10057 may cause damage to the radio selector buttons. Also, be sure to use the recommended factory tools for removing the adjacent trim pieces. Claims showing trim gouging damage will be denied.
2006-2007 Touareg with V10 Diesel, Glow Plug DTCs
If Glow Plug DTCs are present while performing a PDI, check the state of charge on BOTH of the batteries. If the auxiliary battery (in the rear) is low on charge, it can set Glow Plug DTCs because this is the battery that powers them up during start-up.
2006-2007 Touareg with 5.0L V10 TDI Engine, Battery
These vehicles are equipped with a dual battery system. Please refer to Technical Bulletin 27-04-01 for information/guidelines regarding the testing and charging of both batteries
All Model Year Engines with Adjustable Cam Timing
If you have a complaint of a rattle or knocking noise coming from the Camshaft Chain Tensioner(s) or Camshaft Adjuster(s) for the first couple of seconds after the engine starts, do NOT replace the Camshaft Tensioner(s) or Camshaft Adjuster(s) for this concern; it will NOT eliminate this noise.
Camshaft adjustment is hydraulically actuated and controlled by engine oil pressure. If the engine hasn’t been run for a length of time, the oil pressure drops and some of the oil partially flows back into the sump. After a cold start, by design, oil pressure inside the camshaft adjusters must be built up as fast as possible which can sometimes cause a rattle or knocking noise. The noise is considered normal.
2004-2007 Touareg, Transfer Case Fin Damage Due to Removal
Warranty will deny core claims damage to the transfer case fin due to improper removal procedures. To avoid Warranty denial, do NOT use power tools for removal, instead use hand tools to avoid damaging (as illustrated in the picture below) the transfer case fins.
2004-2007 Touareg, DTC 01772 (00
If you have a complaint of air suspension DTC 01772 (00
, follow the directions in Technical Bulletin 43-05-02 step-by-step BEFORE contacting the Volkswagen Dealer Technician Helpline.
2005-2007 Touareg, Entering Mileage Into Instrument Cluster
If you experience difficulty when trying to adapt the mileage after an instrument cluster replacement, use the following procedure:
- Select Vehicle Self Diagnosis
- Select Address Word 17 (dash panel insert)
- Select Adaptation
- Enter Channel 9
- Enter the mileage (US vehicles) or kilometers (Canadian vehicles) after multiplying the actual mileage or kilometers by 0.1 (which will drop the last digit). Example: 87612 x 0.1 = 8761
2007 Touareg, G85 Basic Setting
Currently there is no procedure loaded in the scan tool to perform G85 Basic Settings on a 2007 Touareg; however, the 2006 Touareg test plan can be used instead. When the software is updated in the scan tool, this Tech Tip will be removed.
2004-2007 Touareg, Creaking Noise While Accelerating
For a complaint of a creaking noise upon acceleration following a stop while cornering or driving slowly, inspect the wheels and tires for factory recommended specifications for tread depth, wheel circumference and tire pressure. Four-wheel drive vehicle tires must NOT be worn unevenly. The largest and smallest tire circumference when compared to each other should NOT differ by more than 1%. This can occur if aftermarket tires from different manufacturers have been installed by the customer. Inspect and record which tires and wheels are installed on the vehicle and re-assess the complaint