VIDEO

Informace

Hyundai

Hyundai B1639

See the basic definition of a diagnostic error. This will help you to clarify the main causes of the fault code. You will understand the program of the control unit
Basic DTC analysis according to OBD2 protocol standard.

OBD2 or On-Board Diagnostics displays messages for basic group styles. More comprehensible code composition has been standard since 2000. The DTC code consists of five characters and its composition will be shown in this video

Insight into programming

The basic unit for the operation of any computer is the bit. Logic 0 and 1 are expressed by a single bit. Diagnostics The error code is composed of 16 bits. The first two bits define one of the four basic circuits. The video will show you a comprehensive overview of the composition of the error report

A diagnostically understandable description of the Diagnostic Trouble Code

Hyundai B1639

Basic error definition

Fuel Pump Secondary Circuit High

Cause of DTC

This DTC sets when the PCM detects voltage on the FPM circuit while the fuel pump (FP) is commanded OFF. The FPM circuit is wired to a pull-up voltage inside the PCM. The FPM circuit goes high if, with the ignition ON, engine OFF and the FP commanded OFF, the FPM FPPWR circuit loses its path to ground through the FP. The FPM circuit also goes high if the FPM FPPWR circuit is short to voltage.