Circuit Description
The EBTCM monitors the Brake Pressure Differential Switch to turn off Traction Control and Active Handling if a pressure loss is detected in the hydraulic brake system.
Conditions for Setting the DTC
DTC C1247 can be set anytime, if the EBTCM detects the Brake Pressure Differential Switch has been grounded due to loss of brake pressure or a short to ground.
Action Taken When the DTC Sets
TCS/Active Handling are disabled.
| • | Indicators that turn on: |
| - | RED Brake Warning indicator |
| - | Car Icon (TCS indicator) |
| • | Messages displayed on the DIC: |
| - | Service Traction System |
| - | Service Active HNDLG |
Conditions for Clearing the DTC
| • | Condition for DTC is no longer present and scan tool clear DTC function is used. |
| • | Fifty ignition cycles have passed with no DTCs detected. |
Diagnostic Aids
| • | DTC C1247 could be set during a hydraulic brake system bleeding procedure if the ignition switch is in the ON position. |
| • | 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. |
| • | An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation. |
| • | If an intermittent malfunction exists refer to Testing for Electrical Intermittents in Wiring Systems. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
This step checks for a short to ground in the Brake Pressure Differential Switch circuit.
-
This step indicates that the Brake Pressure Differential Switch circuit is operating properly, and the cause of the DTC is a failure in the hydraulic brake system.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | ||
Does the Red BRAKE Warning Indicator remain on? | -- | |||
3 | Repair circuit 1659 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
The Brake Pressure Differential Switch is working properly. Refer to Hydraulic Brake Diagnostic System Check in Brakes. Is the repair complete? | -- | -- |
