The electronic brake control module (EBCM) monitors the function of the brake fluid flow switch to assure that the switch opens and closes properly.
• | The ignition is ON. |
• | The EBCM has received a serial data message from the powertrain control module (PCM) indicating that the engine is running. |
The EBCM detects a closed brake fluid flow switch for greater than 1.6 seconds.
• | The brake warning indicator turns ON. |
• | A fast rate audible chime turns ON. |
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.
Ensure the power steering fluid is full and that the power steering belt is in good condition with proper tension. Any failure in the power steering system which effects steering or brake assist may cause this DTC to set.
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to Testing for Intermittent Conditions and Poor Connections , Connector Repairs , Testing for Electrical Intermittents and to Wiring Repairs in Wiring Systems.
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No | ||||||
---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Brake Warning System Schematics | |||||||||
1 | Did you perform the hydraulic brake Diagnostic System Check? | Go to Step 2 | |||||||
2 |
Does the DTC set? | Go to Step 3 | Go to Diagnostic Aids | ||||||
3 | Ensure the power brake system is operating properly by performing the Brake Assist System Diagnosis . Did you find and correct the condition? | Go to Step 8 | Go to Step 4 | ||||||
Does DTC C0285 reset? | Go to Step 6 | Go to Step 5 | |||||||
5 | Replace the hydromax flow switch. Refer to Fluid Flow Switch Replacement . Did you complete the replacement? | Go to Step 8 | -- | ||||||
6 |
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 8 | Go to Step 7 | ||||||
7 |
Important: Following EBCM replacement, use the scan tool to perform the Tire Size/Wheel Base Calibration procedure. Replace the EBCM. Refer to Electronic Brake Control Module Replacement in Antilock Brake System. Did you complete the replacement? | Go to Step 8 | -- | ||||||
8 |
Does the DTC reset? | Go to Step 3 | System OK |