What systems of the vehicle may be affected by fault in the OBD2 to J1939 and J1708 cable interfaces?

What systems of the vehicle may be affected by  fault in the OBD2 to J1939 and J1708 cable interfaces?

The interface failure of OBD2 to J1939 and J1708 cables may have an impact on the vehicle's power system, safety system, emission system, and onboard information system, as follows:

dynamical system

Engine performance degradation: Cable interface failure may cause the engine control unit (ECU) to be unable to accurately receive or send data related to the engine operating status, such as fuel injection quantity, ignition timing, and other information. This will reduce the combustion efficiency of the engine, resulting in problems such as insufficient power, poor acceleration, and increased shaking.

Fault light on: When the ECU detects abnormal data transmission related to the engine, it will trigger the fault indicator light to light up, indicating to the driver that there is a problem with the vehicle.

security system

Abnormal Anti lock Braking System (ABS): ABS needs to exchange data with other control units through cables to monitor information such as wheel speed. Interface failure may cause ABS to be unable to obtain data in a timely and accurate manner, resulting in abnormal operation during emergency braking, prolonging the braking distance of the vehicle, and increasing the risk of traffic accidents.

Electronic Stability Program (ESP) Failure: The ESP system relies on data communication between multiple sensors and control units to maintain the vehicle's driving stability. Cable interface failure may interfere with the normal operation of the ESP system, making it unable to intervene in a timely manner when the vehicle experiences dangerous situations such as skidding or tailgating, endangering driving safety.

drain off system

Excessive exhaust emissions: The vehicle's emission control system needs to accurately control the operation of equipment such as exhaust gas recirculation (EGR) and three-way catalytic converters based on the engine's operating status. Cable interface failure may lead to transmission errors in emission control related data, making it impossible for the emission control system to adjust properly, resulting in excessive levels of harmful substances in exhaust gas. This not only pollutes the environment, but may also cause vehicles to fail environmental testing.

Damage to emission system components: Due to the inability of the emission system to accurately control based on actual operating conditions, prolonged abnormal operation can accelerate the wear and tear of components such as EGR valves and three-way catalytic converters, shorten their service life, and increase maintenance costs.

telematics

Abnormal instrument display: The vehicle's dashboard needs to obtain data from various sensors and control units to display information such as vehicle speed, RPM, water temperature, fuel consumption, etc. Cable interface failure may result in inaccurate or incomplete data received by the dashboard, causing errors, flickering, or missing information in the instrument display, affecting the driver's judgment of the vehicle status.

The on-board diagnostic function is limited: Modern vehicles' on-board information systems usually have a certain self diagnostic function, which obtains fault information of various systems of the vehicle through interface connection with OBD2. Cable interface faults can prevent the onboard information system from communicating properly with OBD2 to J1939 and J1708 cables, resulting in the inability to use self diagnostic functions and making it difficult for drivers to detect potential faults in the vehicle in a timely manner.