The EBCM relay closes and vehicle battery voltage is applied to the high side of all six solenoid coils (three isolation solenoid coils and three dump solenoid coils) whenever ABS valve activity may be required. Each valve solenoid is energized when the EBCM microprocessor turns on an output driver transistor to short the low side of the solenoid coil to ground. The EBCM microprocessor monitors the state of the circuit on the low side of each solenoid coil with a feedback circuit to the EBCM microprocessor. Whenever the EBCM relay is closed and a solenoid coil output driver transistor is not turned on, the feedback voltage should be high. If it is not, and the problem persists long enough, the open solenoid coil DTC will set. If the EBCM relay is not turned on, the feedback voltage should be low. If it is not, and the problem persists long enough, the shorted solenoid coil DTC will set. The relay and the six solenoid coils are located within the EBCM.

Open Circuit

Low voltage is present on the EBCM solenoid driver circuit when the voltage is expected to be high (solenoid not energized).

Shorted Circuit

High voltage is present on the EBCM solenoid driver circuit when the voltage is expected to be low (solenoid energized).

Malfunction responses to DTC C0241--C0254 vary, depending on the affected subsystem.

For a detailed explanation of DTC malfunction responses, refer to Self-Diagnostics

This DTC usually sets because of an open/shorted solenoid coil within the EHCU. The solenoid coil is located within the EBCM and is not serviceable. If the test does not repair the DTC, then replace the EBCM.

If this DTC sets with other DTCs, check for the following conditions:

The numbers below refer to the steps in the diagnostic table:

3. The function test turns ON the solenoids. The DTC sets if the malfunction is present and the solenoids are commanded ON.