ABS/TCS Indicators
- If the system is OK, the ABS indicator goes off once after turning the ignition switch ON (II) without starting the engine, and then comes on again and goes off several seconds later after starting the engine. This occurs because the ABS/TCS control unit is turned on by the IG2 power source.
- The TCS or ABS indicator comes on when the ABS/TCS control unit detects a problem in the system. However, even though the system is operating properly, the TCS or ABS indicator will come on, under the following conditions:
- For ABS or TCS Indicator:
- Only drive wheels rotate
- One drive wheel is stuck
- The vehicle goes into a spin
- The ABS continues to operate for a long time
- The vehicle is subjected to an electrical signal disturbance
- For TCS Indicator:
- The TCS operated when the front brake pad temperature rises excessively
- The TCS switch is OFF
- One or more of these components are faulty: Heated oxygen sensor, Manifold absolute pressure sensor, Crankshaft position sensor, Engine coolant temperature sensor, Throttle position sensor, Top dead center sensor 1, Top dead center sensor 2, Intake air temperature sensor, Exhaust gas recirculation, Barometric pressure sensor, Idle air control valve, VTEC pressure switch, Knock sensor, Fuel supply system, Automatic transaxle, Misfire detection system of the PGM-FI system
To determine the actual cause of the problem, question the customer about the problem, taking the above-listed conditions into consideration:
- When a problem is detected and the ABS or TCS indicator comes on, there are cases when the indicator stays on until the ignition switch is turned OFF, and cases when the indicator goes off automatically when the system returns to normal. For ABS DTCs 61 and 62, the indicator goes off automatically when the system returns to normal. For all other codes, the indicator stays on until the ignition switch is turned OFF.
- For ABS DTCs 12, 14, 16, 18, 21, 22, 23, 24, 51, 52 and 53, the ABS indicator goes off when the vehicle is driven again and the system is OK after the ignition switch is turned from OFF to ON (II). However, if the DTC is cleared, the CPU resets and the indicator goes off right after the engine is started if the system is OK.
- The ABS is not operational when the ABS indicator is ON; the TCS is not operational when the TCS indicator is ON.
- When the ABS and TCS indicators are both ON, troubleshoot the ABS first.
- When the TCS indicator and MIL are both ON, troubleshoot the PGM-FI system first.