C0253

Circuit Description
The EBCM microprocessor will ground the indicated solenoid coil (RF dump/isolation, LF dump/isolation, or Rear dump/isolation) circuit to energize the solenoid coil whenever the solenoid valve is needed. Refer to ABS Braking Mode in ABS Operation. The magnetic force created by the solenoid coil will close the isolation valve.

Conditions for Running the DTC
^ Ignition switch in the RUN position.
^ Bulb check complete.
^ EBCM relay closed.

Conditions for Setting the DTC
Open Circuit
Low voltage exists on the EBCM solenoid driver circuit when high voltage is expected (the solenoid is not energized)
Shorted Circuit
High voltage is present on the EBCM solenoid driver circuit when the voltage is expected to be low (solenoid energized).

Action Taken When the DTC Sets
^ The ABS indicator lamp turns on
^ The ABS disables
DTCs C0241-C0254 are Ignition Latched DTCs, which indicates the above actions remain true until the ignition is turned to OFF (even if the cause of the DTC is intermittent).
DTCs C0241-C0254 are DRP critical malfunctions (except for C0243/C0244 and C0247/C0248), which means that DRP is disabled and the BRAKE indicator lamp will also light. DTCs C0243/C0244 and C0247/ C0248 are DRP non-critical malfunctions. If any other DTC sets before this DTC is investigated and cleared, this will become a DRP critical malfunction.

Conditions for Clearing the DTC
^ Repair the conditions responsible for setting the DTC
^ Use the Scan Tool Clear DTCs function

Diagnostic Aids
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: A poor EBCM power or signal ground
^ A poor EBCM power or ignition feed

Test Description
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.