Circuit Description
The EBCM initializes a self-test when the ignition is turned to the RUN position. This internal self-test verifies that all ABS circuitry is operating correctly.
Conditions for Setting the DTC
Any condition within the EBCM which causes a memory error will set the DTC.
Action Taken When the DTC Sets
| • | The ABS indicator lamp is turned on |
| • | The ABS is disabled |
These DTCs are Permanent Latched DTCs, which indicates that the above actions remain true until the DTC is cleared using a Scan Tool .
Conditions for Clearing the DTC
| • | Repair the conditions responsible for setting the DTC |
| • | Use the Scan Tool Clear DTCs function |
Diagnostic Aids
DTCs C0271-C0273 are EBCM internal diagnosis trouble codes. Replace the EBCM if these tests show that the EBCM circuitry has failed.
If DTCs C0271, C0272 or C0273 are setting after replacing the EBCM, check the vehicle for an auxiliary device (winch, auxiliary battery system, etc.) which could cause a voltage spike on the battery feed to the EBCM. If the vehicle does have an auxiliary device, install a Metallic Oxide Varistor (MOV) in the battery feed circuit to the EBCM.
Test Description
The numbers below refer to the steps in the diagnostic table:
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |
Install the Scan Tool and attempt to clear the DTCs. Did the DTCs clear? | -- | |||
Check the history DTCs and the data. Was this the first time the DTC has set? | -- | Go to Diagnostic System Check | ||
4 | Replace the EBCM. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
