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Troubleshooting Precautions ABS Indicator 1. If the system is OK, the ABS indicator goes off 2 seconds after turning the ignition switch ON (II) without starting the engine, and then comes on again and goes off after 2 seconds. This occurs because the ABS control unit is turned on by the IG2 power source. 2. The ABS indicator comes on when the ABS control unit detects a problem in the system. However, even though the system is operating properly, the ABS indicator will come on, under the following conditions. Only drive wheels rotate To determine the actual cause of problem, question the customer about the problem, taking these conditions into con- 3. When a problem is detected and the ABS indicator comes on, there are cases when the indicator stays on until the igni- tion switch is turned OFF, and cases when the indicator goes off automatically when the system returns to normal. For DTCs 61 and 62, the indicator goes off automatically when the system returns to normal. For all other codes, the indica- tor stays on until the ignition switch is turned OFF. 4. For DTCs 12, 14, 16, 18, 21, 22, 23, 24, 51, 52 and 53, the indicator goes off when the vehicle is driven again and the sys- tem is OK after the ignition switch is turned from OFF to ON (II). However, if the DTC is erased, the CPU is reset and the indicator goes off right after the engine is started if the system is OK. Diagnostic Trouble Code (DTC) 1. If the CPU cannot be activated and the indicator comes on, the DTC is not memorized. 2. The memory can hold any number of DTCs. However, when the same DTC is detected more than once, the later one is written over the old one. Therefore, when the same problem is detected repeatedly, it is memorized as 1 DTC. 3. The DTCs are indicated in the order of ascending number, not in the order they occur. 4. The DTCs are memorized in the EEPROM (non-volatile memory). Therefore, the memorized DTCs cannot be canceled by disconnecting the battery. Perform the specified procedures to erase the DTCs. Self-diagnosis 1. Self-diagnosis can be classified into 2 categories. • Initial diagnosis: Performed right after the engine starts and until the ABS indicator goes off. 2. When a problem is detected by self-diagnosis, the system. Turns the fail-safe relay OFF Main Menu Table of Contents |