VIDEO

Informace

GMC

GMC C121D

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 C121D

Basic error definition

O2 Sensor Signal Stuck Rich Bank 2 Sensor 1

Cause of DTC

Modeled exhaust temp, 300–900 °C Delta engine load, lt;9% Exhaust gas mass flow, 7.5–140 kg h Number of interrupts by acceleration enrichment, gt;40 Lambda control, Closed loop 2nd Lambda control, Closed loop O2S front, Ready, no fault O2S rear, Ready, no fault O2S heater front, Ready, no fault O2S heater rear, Ready, no fault Fuel cut off, Not active Catalyst heating, Not active SAI, Not active 1st Lambda control loop, Not at min or max limit 2nd Lambda control loop, Active 1st Lambda control loop, At min limit O2S front, lt;1.0 O2S rear voltage, lt;0.4 V 1st Lambda control loop, At max limit O2S front, gt;1 O2S rear voltage, gt;0.6 V