The video focuses on the basic Volkswagen specific diagnostic error code.
Contents:
0:21 Basic DTC analysis according to OBD2 protocol standard.
1:48 Insight into programming
- an explanation of what a bit is and how a byte is formed
- decoding the Error Code to the base programming
2:58 A diagnostically understandable description of the Diagnostic Trouble Code
3:05 Basic error definition
- Possible causes or errors of the car and its parts describing the mentioned error

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Make:
Volkswagen
Code:
P2146
Definition:
ABS Pump Motor Voltage Fault
Description:
The ABS ECU supplies battery power to the electric motor with a motor relay which is controlled by the Electronic Control Unit(ECU).The ABS ECU monitors the pump motor relay or fuse open,open or short in motor or motor lock and then sets this code if a malfunction is detected.Case 1 A failure is detected if pump motor voltage >0.93V continued for 1.8sec.Case 2 A failure is detected if pump motor voltage 7.3V continued for 1.8sec.Case 3 A failure is detected if the short circuit event has continuously occurred 3 times.- The short circuit event is counted if pump switch voltage >0.5V continued for about 1ms when the pump motor is activated In case no electrical pump motor short circuit has been detected,a failure is detected if the mechanically locked pump event has continuously occurred 10 times.- A mechanically locked pump event is counted if pump switch voltage >0.5V continued for about 20ms when the pump motor is activated.Case 4 A defect of the pump is assumed if an insufficient generator voltage is detected within 14 or 21 ms after the deactivation.The pump motor will then be activated again for about 1.8 s (2nd pump test) and the generator voltage is evaluated again after deactivation.A failure is detected if this second evaluation also does not show sufficient generator voltage.
Cause:
Open or short of power supply circuit (ABS1)Faulty HECU

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