On Board Diagnostic (OBD), function
The instrument cluster is controlled by an internal microprocessor with On Board Diagnostic (OBD)
capability. If malfunctions occur in monitored sensors and components, Diagnostic Trouble Codes
(DTC) will be stored in memory.
If OBD recognizes instrument cluster malfunctions related to the:
? Odometer
? Distance impulse number (K number)
? Speedometer calibration
the trip odometer display will change to show "dEF.".
In this case, replace speedometer. Refer to Instrument cluster, removing and installing.
Other malfunctions recognized by OBD will not cause the trip odometer display to change as
described above.
However, before performing any troubleshooting or inspection, always begin by checking for DTCs
using the On Board Diagnostic (OBD) program. DTCs stored in memory are retrieved/checked with
VAG 1551/1552 Scan Tools (ST) or VAS 5051/5052 Diagnostic Testing and Information System
SCAN as a first step, this will require a trip to VW Also check all fuses even the ones under the hood, any marked as INST or Cluster pay close attention to.
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Saturday, March 12th, 2011 AT 6:54 PM
