Circuit Description
The EBCM microprocessor initializes a self-test when the ignition is turned ON to verify that the EBCM microprocessor's internal circuitry is functioning correctly.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The EBCM microprocessor detects an internal malfunction.
Action Taken When the DTC Sets
C0271 and C0272
| • | The ABS and BRAKE indicators are commanded on. |
| • | The ABS and DRP are disabled permanently. |
C0273 and C0284
| • | The ABS and BRAKE indicators are commanded on. |
| • | The ABS and DRP are disabled for the remainder of the ignition cycle. |
Conditions for Clearing the DTC
C0271 and C0272
DTC C0271 and DTC C0272 cannot be cleared from the EBCM memory. The EBCM must be replaced if either of these DTCs is set.
C0273 and C0284
Use a scan tool in order to clear the DTC.
Diagnostic Aids
Replace the EBCM if DTC C0273 or DTC C0284 continues to set intermittently.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check |
2 | Is DTC C0271 or DTC C0272 set in the EBCM memory? | -- | Go to Step 4 | Go to Step 3 |
3 |
Does the DTC set? | -- | Go to Step 4 | Go to Diagnostic Aids |
4 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Important: Perform the Tire Size Calibration procedure. Refer to Scan Tool Diagnostics Did you complete the replacement? | -- | System OK | -- |
