Circuit Description
Control modules are specifically designed for a particular vehicle option. If any module that communicates with the EBCM is for an incorrect application this DTC will set.
Conditions for Running the DTC
DTC 78 can be set anytime the ignition switch is in the ON position.
Conditions for Setting the DTC
The electronic brake control module (EBCM) detects an incorrect module application.
Action Taken When the DTC Sets
| • | The EBCM disables the traction control system for the remainder of the ignition cycle. |
| • | The TRAC OFF warning indicator turns ON. |
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.
Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
| • | An incorrect module application |
| • | An internal EBCM malfunction |
If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The numbers below refer to step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views | |||
1 | Did you perform A Diagnostic System Check - ABS? | Go to Step 2 | |
With a scan tool, verify that the correct EBCM and PCM are installed on the vehicle. Are the correct modules installed? | Go to Step 3 | Go to Step 4 | |
3 | Use the scan tool in order to read the DTCs. Are other DTCs present? | Go to Step 5 | |
4 | Replace the appropriate control module. Refer to Electronic Brake Control Module Replacement or Powertrain Control Module Replacement in Engine Controls - 5.7L. Did you complete the replacement? | Go to Step 7 | -- |
5 |
Does the DTC reset? | Go to Step 6 | Go to Diagnostic Aids |
6 | Replace the electronic brake control module (EBCM). Refer to Electronic Brake Control Module Replacement . Did you complete the replacement? | Go to Step 7 | -- |
7 |
Does the DTC reset? | Go to Step 2 | System OK |
