ESC does not work efficiently

1. ESC does not work efficiently description of symptom

ESC malfunction and excessive operation

2. ESC does not work efficiently diagnostics

1. Preliminary inspection

Perform the brake control system inspection.

Refer to "54.Brake Control 4A.Troubleshooting(ABS/ESC) diagnostic System Check - Brake Controls".

Inspect for the following.

  • There should be no malfunctions in the warning light and indicator light operation.
  • There should be no DTC input.

2. Visual inspection

Visually inspect the vehicle condition with the following in mind before installing, removing, disassembling, and inspecting the components.

  • Terminal connection status inspection
  • Inspection for aftermarket accessory power diverged from the EHCU
  • EHCU ground installation status inspection
  • Installation status inspection of the pipes and hoses in the brake system

3. Diagnostics

1) Indicator light/running mode check

If the ESC do not operate, check the display status of the ESC OFF indicator light.

Check whether operating the ESC OFF switch resulted in a switch to ESC OFF mode.

2) ESC operating conditions check

Check whether the vehicle speed when the ESC did not operate was 15 km/h {9 mph} or less.

3) ESC warning light check

If the ESC warning light is illuminated, observe the DTC.

If a DTC is set, go to the applicable DTC diagnosis.

4) Tire inspection

Check whether the tires of the specified size are installed.

5) DTC verification

Observe the DTC information with a scan tool.

If a DTC is set, go to the applicable DTC diagnosis.

6) Scan tool data verification

Check the scan tool data using a scan tool.

If a problem is found, repair the applicable area.

Copyright Mazda Motor Corporation. All rights reserved.