VIDEO

Informace

Buick

Buick U1160

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

Buick U1160

Basic error definition

ABS Pump Motor Voltage Fault

Cause of DTC

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 gt; 0.93V continued for 1.8sec. Case 2 A failure is detected if pump motor voltage lt; 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 gt; 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 gt; 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.