Going to try indirect TPMS on an '09

birkie said:

I haven't done much driving until today, but here was my experience with the indirect TPMS settings:

• TPMS light is samong the seferal lights that briefly flash upon turning key to 'on' position. Disappears after about a second.
• Drove about 50 miles with equally inflated, sensorless tires. No TPMS light or other warnings on dash
• Deflated one of the rear tires slightly, by about 8% (38 -> 35). Drove about 5 miles. No warning light.
• Deflated same tire by about 20% of original value (38 -> 31). TPMS warning light appeared after about a mile.
• Inflated rear tire to original value. Drove about 2 miles home. TPMS warning light was still steady on.
• Performed TPMS reset in ABS module (basic settings to 042). Light want away
• Drove about 120 miles. Light remained off.

So, I think this is an indication that an '09 TDI has the proper ABS controller logic to perform indirect tire pressure monitoring, just like the 2011 models. I guess I will never have the experience of buying replacement sensors when my old ones die

Here is what I did:

• Disable hardware TPMS in the central convenience controller. Using the long coding helper, check bit 5 of byte 17 Tire Pressure Monitoring (TPMS - PR-7K3/7K4/7K5 not installed/inactive
• Disable TPMS in the CAN bus controller. Using the long coding helper, un-check bit 0 of byte 3 Tire Pressure Monitoring.
• Enable indirect TPMS in the ABS controller. Using the long coding helper, check bit 2 of byte 16 Tire Pressure Monitoring (TPMS/PR-7K6) installed
• Reset the indirect TPMS system by applying basic settings to block 042 of the ABS controller.

When I deflated the rear tire, a code was thrown by the ABS unit when low pressure was detected:

Code:

Address 03: ABS Brakes (-----)       Labels: 1K0-907-379-60EC1F.clb
   Part No SW: 1K0 907 379 AD    HW: 1K0 907 379 AD
   Component: ESP MK60EC1   H35 0106  
   Revision: 00H35001    
   Coding: 113B600D49240000881206EB922200423400
   Shop #: WSC 00066 000 00000
   VCID: 74EC37F66EC7

1 Fault Found:
02214 - Tire Pressure Warning 
            002 - Lower Limit Exceeded - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 230
                    Mileage: 63668 km
                    Time Indication: 0

             Freeze Frame:
                    Count: 0
                    Count: 32768
                    Count: 4608
                    Count: 397
                    Count: 51255
                    Count: 0
                    Count: 0

* If you forget to disable TPMS in the Central Convenience module, this is what happens:

There is one catch (later found out to be due to TPMS still activated in Central Convenience) - when scanning for fault codes, it seems that the CAN bus and the hardware-based TPMS unit throw faults:

From the CAN bus:

Code:

01044 - Control Module Incorrectly Coded 
            000 -  -

From the TPMS:

Code:

01521 - Sensor for Tire Pressure 
            004 - No Signal/Communication

Neither of these seem to cause an idiot light, or interfere with the functioning of the indirect TPMS reporting.

Click to expand...

umrpunter said:

has anyone gotten a succinct diy put together for this?

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