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I have 2009 Volkswagen Jetta TDI diesel 2.0L, they saying this car required CAN bus system instead kwp2000.

My question is:

How does the protocol Id change? Maybe ECU is defective? Some people told me that OBD2 talking with different module from ECU.

from the car:

  • Protocol: KWPS8FE9 ( should be CAN )
  • ECU Address(es): 1A
  • CAL ID(Calibration ID): 02F300050D 1402 ( they say wrong CAL ID )
  • CAL CVN(Calibration Verification Number): 21DB ( they say wrong CAL CVN )

If you look at those monitors not supported.

OBDII Readiness Monitor Details:

  • Misfire Monitor Supported: N
  • Fuel System Monitoring Supported: N
  • Component Monitor Supported: Y
  • Catalyst Monitor Supported: N
  • Heated Catalyst Supported: N
  • EVAP System Supported: N
  • Miss Monitor Ready: NS
  • Fuel System Monitor Ready: NS
  • Component Monitor Ready: NS
  • Catalyst Monitor Ready: NS
  • Heated Catalyst Monitor Ready: NS
  • EVAP Monitor Ready: NS

How is it possible ECU unit created not belong to this vehicle CAL ID (Calibration ID): 02F300050D 1402 and CAL CVN (Calibration Verification Number): 21DB ?

I went to VW dealer couple of time and system profile saying engine/powertrain computer/ module checked was done by dealer.

Could it miscommunicate protocol KWP instead of CAN protocol ?

  • To my knowledge, CAN is not a protocol, but rather is the network layer (Car Area Network) the protocol rides on. – Pᴀᴜʟsᴛᴇʀ2 Oct 19 at 16:43
  • Who is "they"? And as Paulster mentioned, KWP2000 is an OBD protocol that runs on CAN, so "they" are not telling you something useful. – Rory Alsop Oct 21 at 10:12
  • VW dealer gave to me some diagnostic log: Communication path: CAN/K line Engine electronics log versions: KWP2000/TP20. I talk to one of the tech from VW , he saying Unsupported status of every monitor is generally caused by faulty programming of the vehicle’s emissions control computer, requires the emission control computer to be reprogrammed to resolve the problem. – Alex48 Oct 29 at 17:45

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