ABS indicator
1. If the system is normal, the ABS indicator goes out two seconds after the ignition key is turned to the ON (II) position without starting the engine, then comes on again and goes out two seconds later. This is because the ABS control unit is powered by the IG2 power source.
2. The ABS indicator comes on when the ABS control unit detects a malfunction in the system. However, although the system is operating normally, the ABS indicator also comes on under the following conditions:
- Signal interference
- Wheel slippage
- Only the drive wheels rotate
- Battery voltage fluctuations To determine the actual cause of the malfunction, it is necessary to know the exact conditions for the indicator to light up
3. When a malfunction is detected and the ABS indicator comes on, there are cases where the indicator stays on until the ignition key is turned to the OFF position and cases where the indicator goes out automatically when the system returns to normal. In the case of DTC 61, the indicator goes out automatically when the system returns to normal. For all other codes, the indicator stays on until the ignition key is turned to the OFF position.
4. The ABS indicator remains on when the system is turned back on without clearing the DTC, but goes out after the engine is started. If the wheel sensor system is faulty and the ABS indicator comes on, the system algorithm automatically turns off the ABS indicator after the wheel speed signal returns to normal. Also, when the DTC is cleared, the CPU returns to its original state and the ABS indicator goes out when the initial diagnosis confirms that the system is normal.
Therefore, after servicing the wheel sensor system, road test the vehicle and ensure that the ABS indicator does not come on.
5. When the ABS control unit supplies battery voltage to the instrument cluster, the ABS indicator goes out.
Diagnostic Trouble Codes (DTCs)
1. A diagnostic trouble code (DTC) is stored in memory when a malfunction is detected and the ABS indicator does not go out or when the ABS indicator comes on. A diagnostic trouble code (DTC) is not stored in memory when the ABS indicator comes on unless the CPU is activated.
2. Any number of DTCs can be stored in the memory. However, when the same DTC is detected two or more times, the old code is overwritten by the new one. Thus, when the same malfunction is detected multiple times, it is recorded as one DTC.
3. DTCs are displayed in ascending numerical order, not in the order they occurred.
4. DTC codes are written to EEPROM (non-volatile memory).
Therefore, stored DTCs cannot be cleared by disconnecting the battery. To clear DTCs, perform the required procedures.
Self-diagnosis
1. Self-diagnosis can be divided into the following four categories:
- Primary diagnostics: performed immediately after starting the engine until the ABS indicator goes out.
- Without ABS control: Performed when the ABS system is not active.
- With ABS control: Performed when the ABS system is active.
- When warning signal is issued: Performed when the ABS indicator is on.
2. When a malfunction is detected during self-diagnosis, the system performs the following actions.
- The ABS indicator lights up
- Enters DTC code into memory
- Stops the ABS system from working
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