For 1990-2009 cars

### 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.

1. This step reads the TCS status.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the ABS Diagnostic System Check performed? | -- | Go to Step 2 | Go to Diagnostic System Check - ABS
2 |

1. Turn ON the ignition leaving the engine OFF.
2. Use a scan tool in order to read the ABS/TCS DTCs.

Are there any other DTCs?

--

Go to Diagnostic Trouble Code (DTC) List

Go to Step 3

3 |

1. Allow the vehicle to cool for 30 minutes after driving.
2. Use a scan tool in order to enter the ABS/TCS Data List and read the TCS status.

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? | -- | Go to Diagnostic System Check - ABS | --
5 | Inspect the stoplamp switch for misadjustment. Is the switch misadjusted? | -- | Go to Stop Lamp Switch Adjustment in Hydraulic Brakes | Go to Diagnostic System Check - ABS