Self-Diagnostic System

Self-diagnosis can be classified into two categories, initial diagnosis and regular diagnosis. Initial diagnosis is done right after the engine starts and until the ABS indicator goes OFF. Regular diagnosis is done right after the initial diagnosis until the ignition switch is turned OFF.

When a problem is detected by self-diagnosis, the system does the following:

• Turns the ABS indicator ON.
• Memorizes the DTC.
• Stops ABS control.

The memory can hold three DTCs. However, when the same DTC is detected more than once, the more recent DTC is written over the earlier one. Therefore, when the same problem is detected repeatedly, it is memorized as a single DTC.

The DTCs are in the order they occurred, beginning with the most recent.

The DTCs are memorized in the EEPROM (non-volatile memory). Therefore, the memorized DTCs are not cleared when the battery is disconnected, the ignition switch is turned OFF, or the system returns to normal. Perform the specified procedures to clear the DTCs.