• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Power Brake Booster Fluid Flow Switch Signal | -- | C0286 | C0286 | -- |
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 detects a open brake fluid flow switch for greater than 4.4 seconds.
• | The brake warning indicator illuminates. |
• | A fast rate audible chime turns ON. |
The condition for setting the DTC are no longer present.
• | This DTC may be caused by a fluid flow switch that sticks open intermittently. |
• | Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. |
• | The ground circuit 151 of the Park Brake Booster Fluid Flow Switch should be checked for an intermittent or open. |
Control Module References for Scan Tool Information
Clear the DTCs, Engine ON, allow the engine to idle for 10 seconds. Engine OFF for 10 seconds, Ignition ON, the DTC should set.
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test between the park brake booster fluid flow switch signal circuit terminal A and splice 111 for an open/high resistance. If the circuit tests normal, replace the EBCM. |
⇒ | If the test lamp illuminates in a blinking manner ON then OFF, test between the park brake booster fluid flow switch signal circuit terminal A and splice 111 for a short to voltage. If the circuit tests normal, replace the park brake booster fluid flow switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Important: After doing a EBCM replacement, use the scan tool to perform a Tire Size/Wheel Base Calibration procedure in EBCM special functions. Refer to Electronic Brake Control Module Replacement
• | Control Module References for EBCM replacement, setup, and programming |