VIDEO

Informace

GMC

GMC P1630

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

GMC P1630

Basic error definition

Right Front Wheel Speed Sensor. General Failure Information. Mechanical Failures

Cause of DTC

The brake control module (BCM) receives information about wheel speed from the wheel sensors. The wheel sensors, which are on the wheel mounting, read off a pulse wheel on the wheel spindle. The wheel sensors are supplied with 12 V. When the magnetic wheel rotates, the sensor produces a pulsed current of 7 or 14 mA (quadratic wave). The amperage depends on the position of the damaged wheel. The diagnostic trouble code (DTC) is stored if the control module detects that: The difference in speed between the wheel with the lowest speed and the wheel with the highest speed is too large. The difference in speed between the wheel with lowest and that with second lowest speed is unreasonable. The appearance of the signals from each wheel sensor have implausible rises in the signal value. The pressure reduction on each wheel during ABS control is incorrect. The control modules test for the diagnostic trouble code (DTC) starts in the event of: Speeds above 20 km h. More than one ABS control. Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.