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 |
Malfunction responses to DTC C0241-C0254 vary, depending on the affected subsystem.
| • | ABS--Ignition latched |
| • | DRP--DRP critical (all except DTC C0243/44, C0247/48 which are DRP non critical) |
For a detailed explanation of DTC malfunction responses, refer to Self-Diagnostics .
Conditions for Clearing the DTC
| • | Repair the conditions responsible for setting the DTC. |
| • | Use the Clear DTCs function on the Scan Tool |
Diagnostic Aids
This DTC usually sets because of an open/shorted solenoid coil within the EBCM. The solenoid coil is located within the BPMV 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:
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check |
Does the DTC set? | -- | Go to Step 3 | Go to Step 4 | |
3 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Did you complete the replacement? | -- | Go to Step 4 | -- |
4 | Operate the vehicle under the conditions for running the DTC as specified in the supporting text. Does the DTC set? | -- | Go to Step 2 | System OK |
