DTC C123C, C1255, or C1256
DTC C123C, C1255, or C1256 |
Diagnostic Instructions |
• |
Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
|
• |
Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
|
• |
Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
|
DTC Descriptors |
DTC C123C 00
Electronic Brake Control Module RAM Malfunction
DTC C1255 00
Electronic Control Unit Performance Malfunction
DTC C1256 00
Control Module Programming Checksum Error Malfunction
Circuit/System Description |
When the ignition is turned ON, the microprocessor runs a diagnostic program to detect an internal fault when power up is commanded. If an internal malfunction is detected, the control module will set a DTC.
Conditions for Running the DTC |
Ignition ON
Conditions for Setting the DTC |
The control module detects an internal malfunction.
Action Taken When the DTC Sets |
Specific subsystems will not function or operate in degraded mode.
Conditions for Clearing the DTC |
A current DTC clears when the diagnostic runs and passes.
Reference Information |
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
• |
Circuit Testing
|
• |
Connector Repairs
|
• |
Testing for Intermittent Conditions and Poor Connections
|
• |
Wiring Repairs
|
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing |
1. |
Ignition ON, verify that DTC C0569, C056D, or C056E is not present in the electronic brake control module (EBCM).
|
2. |
If any listed DTC is present, refer to
Diagnostic Trouble Code (DTC) List - Vehicle
to diagnose that DTC prior to this diagnostic.
|
3. |
Replace the K17 Electronic Brake Control Module and verify the DTC does not reset.
|
4. |
If the DTC resets, replace the module that set the DTC.
|
Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for module replacement, setup and programming