When EBCM relay is activated (turned on) voltage is supply to valve solenoids and pump motor. This DTC identifies a malfunction with the EBCM loosing ground or battery, or when battery is disconnected while running.
The ABS/ETS/TCS conditions are normal.
DTC C1254 is set when an running reset occurs. A running reset is when the vehicle is running and functions are normal then suddenly a loss of power or ground connection occurs to the EBCM.
• | ABS/ETS/TCS is disabled. |
• | ABS/ETS/TCS Indicators are turned on. |
• | TIM goes into Autolearn mode after system recovery. |
• | Condition for DTC is no longer present and scan tool clear DTC function is used. |
• | 100 ignition cycles have passed with no DTCs detected. |
• | Possible causes for DTC C1254 to set are: |
- | Running reset occurred. |
- | Loss of EBCM ground. |
- | Sudden drop in voltage. |
- | Poor or loose grounds connections. |
- | Poor or loose power connections. |
- | Battery disconnected due to corrosion or loose battery terminals. |
- | Internal EBCM malfunction. |
• | It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction. |
• | If an intermittent malfunction exists refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
Step | Action | Value(s) | Yes | No | ||||
---|---|---|---|---|---|---|---|---|
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | |||||
2 |
Important: Removing battery voltage or ground from the EBCM will result in the
following conditions:
Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 3 | ||||
3 | Has the battery been disconnected recently? | -- | Go to Step 8 | Go to Step 4 | ||||
4 | Test the charging system. Refer to Battery Inspection/Test in Engine Electrical. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 5 | ||||
5 | Inspect for poor connections/terminal tension at the EBCM harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 6 | ||||
6 |
Does the DTC reset? | -- | Go to Step 7 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | ||||
7 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement Did you complete the repair? | -- | Go to Step 8 | -- | ||||
8 |
Does the DTC reset? | -- | Go to Step 2 | System OK |