PRE-RELEASE
DTC C1255 or C1256
| DTC C1255 or C1256 |
| Diagnostic Instructions |
| • |
Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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| • |
Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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| • |
Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
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 |
| • |
The DTC is cleared when a diagnostic test is run and passes.
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| • |
The DTC in the history is cleared after 40 consecutive fault-free ignition cycles have taken place.
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| 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
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Testing |
| 1. |
Switch ignition ON.
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| 2. |
Check that DTC C056D or C056E is not generated.
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| 3. |
If any of the specified DTCs has been triggered, see
DTC (DTC) list - vehicles
.
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| 4. |
Replace K17 electronic brake control module.
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| 5. |
Verify that DTCs C1255 or C1256 are not set when the vehicle is manoeuvred as specified in "Conditions for running of DTCs" above.
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| 6. |
If any of these DTCs is generated:
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| 7. |
Replace the control device that set the DTC.
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| 8. |
If none of these DTCs are generated:
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| 9. |
All OK.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for control module replacement, setup and programming.
