Circuit Description
The EBCM/EBTCM monitors vehicle speed deceleration, ABS/TCS activation, and brake switch ON times in order to calculate the brake rotor temperatures. As brake rotor usage reduces during driving, the EBCM/EBTCM calculates the brake rotor cooling and the TCS re-enables.
The EBCM/EBTCM may continue the monitoring of the brake rotor temperature after you turn the ignition OFF. The EBCM/EBTCM remains awake until the EBCM/EBTCM calculates that the brake rotors cooled sufficiently. The cooling period may take up to 30 minutes.
Conditions for Setting the DTC
This DTC sets when the estimated brake rotor temperature of either of the drive wheels exceeds 375°C (700°F). When the estimated brake rotor temperature of either of the drive wheels exceeds 375°C (700°F) during normal braking or normal ABS operations, the DTC does not set until the next TCS activation. The brake rotor temperature can exceed 375°C (700°F) without setting the DTC if a TCS activation has not occurred. When the estimated brake rotor temperature of either of the drive wheels exceeds 375°C (700°F) during a TCS activation, the DTC sets immediately, but the EBCM/EBTCM does not disable TCS until the end of the TCS event. The EBCM/EBTCM enables TCS when the estimated brake rotor temperatures of both drive wheels decreases below 275°C (530°F). The EBCM/EBTCM continues the monitoring of the brake rotor temperatures after the ignition is turned OFF. Turning ON the ignition again while TCS is temporarily disabled will not re-enable TCS.
Action Taken When the DTC Sets
| • | A malfunction DTC is stored. |
| • | The TCS is disabled. |
| • | The TRACTION OFF indicator is turned ON. |
| • | The ABS remains functional. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and you used the scan tool Clear DTC function. |
| • | The EBCM/EBTCM does not detect the DTC in 50 drive cycles. |
Diagnostic Aids
| • | The temperature is an estimate calculated by the EBCM/EBTCM. |
| • | Possible causes of this DTC are the following conditions: |
| - | The brake usage is excessive. |
| - | The TCS usage is excessive. |
| - | The stoplamp/BTSI switch is misaligned or damaged. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the ABS Diagnostic System Check performed? | -- | Go to Step 2 | |
2 |
Are there any other DTCs? | -- | ||
Is the brake thermal model exceeded? | -- | Go to Step 4 | Go to Step 5 | |
4 | Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement . Did you complete the repair? | -- | -- | |
5 | Inspect the stoplamp switch for misadjustment. Is the switch misadjusted? | -- | Go to Stop Lamp Switch Adjustment in Hydraulic Brakes |
