Description of On-Board Diagnostics

General Troubleshooting Information

System Indicator





This system has four indicators; ABS indicator (A), TCS indicator (B), TCS activation indicator (C) and brake system indicator (D). When the system detects a problem, it illuminates the appropriate indicators. Depending on the failure, the ABS/TCS control unit determines which indicators are turned on.
^ When ABS function is lost: ABS indicator, TCS indicator and TCS activation indicator turn on.
^ When TCS function is lost: TCS indicator and TCS activation indicator turn on.
^ When all functions are lost: All four indicators turn on.
^ When the gauge control module detects F-CAN circuit problem: ABS indicator, TCS indicator and brake system indicator turn on.

ABS/TCS Indicator
^ If the system is OK, the ABS and TCS indicators go off 2 seconds after turning the ignition switch ON (II).
^ The ABS and TCS indicators come on when the ABS/TCS control unit detects a problem in the system. However, even though the system is operating properly, the indicator may come on under these conditions.
- The vehicle goes into a spin.
- The ABS or TCS continues to operate for a long time.
- The vehicle is subject to an electrical signal disturbance.
- To determine the actual cause of the problem, question the customer about the conditions when the problem occurred, taking the above conditions into consideration.

TCS Activation Indicator
^ If the system is OK, the indicator goes off 2 seconds after turning the ignition switch ON (II).
^ The indicator comes on if the TCS OFF switch is pressed after the ignition switch is turned ON (II).
^ The indicator flashes while the TCS system is active.
^ When a problem is detected and the ABS indicator comes on, but not the TCS indicator, 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.
- DTC 61 or 62: The ABS and TCS indicators go off automatically when the system returns to normal.
- DTC 11, 13, 15, 17, 31, 32, 33, 34, 35, 36, 37, 38, 53, 54, 71, 81, 112, 121, 122, 123 or 124: The ABS and TCS indicators stay on until the ignition switch is turned OFF whether or not the system returns to normal.
- DTC 12, 14, 16, 18, 21, 22, 23, 24, 41, 42, 43, 44, 51 or 52: The ABS indicator stays on until the system returns to normal and the vehicle is driven.
- DTC 64, 65, 66, 68, 83, 84 or 86: The TCS indicator stays on until the ignition switch is turned OFF whether or not the system returns to normal.

Diagnostic Trouble Code (DTC)
^ The memory can hold any number of 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 indicated in ascending number order, not in the order they occur.
^ The DTCs are memorized in the EEPROM (nonvolatile memory). Therefore, the memorized DTCs cannot be canceled by disconnecting the battery. Do the specified procedures to clear the DTCs.

Self-diagnosis
^ Self-diagnosis can be classified into two categories:
- Initial diagnosis: Done right after the engine starts and until the ABS and TCS indicators go off.
- Regular diagnosis: Done right after the initial diagnosis until the ignition switch is turned OFF.
^ When a problem is detected by self-diagnosis, the ABS/TCS control unit shifts to fail-safe mode.

Kickback
The pump motor operates when the ABS is functioning, and the fluid in the reservoir is forced out to the master cylinder, causing kickback at the brake pedal.

Pump Motor
^ The pump motor operates when the ABS or TCS is functioning.
^ The ABS/TCS control unit checks the pump motor operating during initial diagnosis when the vehicle is driven over 12 mph (20 km/h) the first time after the ignition switch is turned ON (II). You may hear the motor operate at this time, but it is normal.

Brake Fluid Replacement/Air Bleeding
Brake fluid replacement and air bleeding procedures are identical to the procedures used on vehicles not equipped with ABS/TCS. To ease bleeding, start with the front wheels.