Tire Monitor System - GEN II System Overview
44 08 02Nov 18, 2008
2015230, supersedes T.B. Group 44 number 07-04 dated June 13, 2007 due to additional explanation of DTC 02214 000 in "Technical Background" section 2 under "Warnings".
Vehicle Information
Condition
Tire Pressure Monitoring System (TPMS) GEN II, Overview
New Generation II TPMS is entirely different from Generation I systems in Touareg models before MY 2008, and also different from the Passat / Jetta system.
Components may look similar, but they are not compatible between systems.
Installation of a wrong part number will trigger a "no communication" fault.
NOTE:
Older Touareg models cannot be retrofitted with this new system as their instrument cluster is not compatible.
Technical Background
Concept: A trigger antenna in each wheelhouse sends a signal to the wheel sensor, which in turn then sends a signal to the central antenna. This central antenna is used for TPMS only, and is not the same as the antenna for the convenience system. The interpretation of this signal is done by the control module as in the previous generation. Advantage is that this communication starts, as soon as the driver door is opened.
Initialization: Nominal tire pressures (same as on the door sticker) are permanently recorded in the control module, a manual initialization (learn drive) is not necessary any longer. The system recognizes its own wheel sensors within seconds and can immediately display location and pressure for each wheel. Only after installation of a new sensor is a "learn drive" of max. 1 minute at a speed of above 5 mph necessary.
WARNINGS:
In all cases, the TPMS symbol will be ON.
1. Display "Flat Tire" in MFI and a buzzer indicates a sudden loss of pressure of more than 0.2 bar/min (2.9 psi/min). After the bus enters an inactive state, the message 2 is displayed when it becomes active again.
2. Display "Tire Pressure too Low" in MFI and a "gong" indicates one or more wheels are 0.5 bar (7.3 psi) or more below nominal pressure, DTC 02214 is recorded for any low pressure condition. Warnings are cancelled and DTC resets by itself from static to sporadic, when pressure is back to within 0.15 bar (2.2 psi) of the nominal pressure. Even a sporadic fault will eventually erase itself after enough drive cycles with the correct pressure.
As the pressure is perhaps 3 psi higher in a warm tire, the value to turn off the warning light must be higher than nominal by the same amount.
System Faults: Only faults that will affect the ability to warn will be displayed to the driver. All other system faults will only cause an entry in the fault log.
Display of System Faults: After ignition cycle, the warning lamp -K230- will blink for 65 seconds before staying on solid.
By selecting the TPMS menu in the MFI, the system will display which wheel or wheels triggered the fault.
Reason for System Faults: Wheel sensor is defective, not installed, or a Gen 1 sensor is installed.
If there is no signal from one or more wheel sensors for 10 minutes or more while driving above 5 mph, a fault is triggered.
Control module, antenna or trigger unit are defective.
Signal transmission error primarily because of interference from items inside the vehicle (example: wireless headset, garage door opener or children's toys).
Diagnosis: When a component malfunction triggers a system fault, all components linked by the LIN-bus, and also the wheel sensors, will record a DTC.
To localize the cause, the easiest checks should be done first.
Possible order:
- Check wheel sensors and erase DTC after completion.
If diagnosis is inconclusive:
- Check antenna and erase DTC after completion.
If diagnosis is inconclusive:
- Check trigger units and erase DTC after completion.
Part 1:
Part 2:
Part 3:
NOTE:
If no warning light is ON and DTC 02214 is the only DTC recorded in the TPMS control module, the system works as designed. A low tire pressure situation was corrected in the past and the DTC is simply the remaining evidence. This condition DOES NOT allow for any repairs or for filing a warranty claim related to this DTC.
Measuring Value Blocks
MVB 1-8: Wheel sensor information
MVB 16: Latest wheel sensor signal received
MVB 17: Calculated median ambient temperature
MVB 18: Load condition monitored
MVB 19: Pressure combination monitored
MVB 20-25: Nominal pressure valves recorded in the control module
MVB 30: Input signal from the powertrain CAN
MVB 31: Supply voltage, monitoring of the comfort CAN
Production Solution
No production change required.
Service
NOTE:
The customer can now observe actual tire pressures while driving. He will become more aware of pressure differences as a result of temperature, such as one side of the vehicle being exposed to the sun or an increase of pressure during operation of the vehicle.
These are normal and expected results. There is no warning for pressures above the nominal.
Warranty
Information only.
Required Parts and Tools
No Special Parts required
No Special Tools required.
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.