On-Board Diagnosis System Description

On-Board Diagnosis System Description

ESP(R) control module is a component of ESP(R) hydraulic unit / control module assembly and has the following functions.

Self-Diagnosis Function

ESP(R) control module monitors input and output signals. When ESP(R) control module detects any malfunction, some of ABS warning light (1), EBD warning light (brake warning light) (2), ESP(R) warning light (3), ESP(R) OFF light (4) are turned ON and indicate the abnormality to driver.

- When ignition switch is turned ON, ABS warning light, EBD warning light, ESP(R) warning light and ESP(R) OFF light light up for 2 seconds to check their circuit.
- When no abnormality is detected, ABS warning light, EBD warning light, ESP(R) warning light and ESP(R) OFF light turn OFF after 2 seconds.
- When an abnormality in the system is detected, some of ABS warning light, EBD warning light (brake warning light), ESP(R) warning light and ESP(R) OFF light are turned ON and the area where that abnormality lies is stored in the memory in ESP(R) control module.






Fail-Safe Mode

When ESP(R) control module detects abnormality, the system goes into fail-safe mode. And some of functions of ABS, traction control system, stability control system are shut down. For details of fail safe mode, refer to Fail-Safe Table Fail-Safe Table.