VIDEO

Informace

GMC

GMC C123

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 C123

Basic error definition

IAT Sensor Circuit High Input

Cause of DTC

DTC P0116-P0118, P0125, P0128, P0502 and P0503 not set, engine started, engine runtime over 180 seconds, ECT sensor more than 140ºF, MAF sensor less than 12 g sec, VSS less than 35 mph, and the PCM detected the IAT sensor indicated less than -38ºF for a period of 3-20 seconds. The IAT sensor is a variable resistor that includes an IAT signal circuit and a low reference circuit to measure the temperature of the air entering the engine. When the IAT sensor is cold, its resistance is high. When the air temperature increases, its resistance decreases. With high sensor resistance, the IAT sensor signal voltage is high. With lower sensor resistance, the IAT sensor signal voltage should be a lower voltage.