Antilock Brake System - Hybrid (HP2)
DTC C0561
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC C0561 4B
- System Disabled Information Stored Calibration Not Learned
DTC C0561 54
- System Disabled Information Stored Temperature High - Solenoid Over Temperature
DTC C0561 59
- System Disabled Information Stored Component Protection Time Out - Pump Motor Run On
DTC C0561 71
- System Disabled Information Stored Invalid Serial Data Received
DTC C0561 72
- System Disabled Information Stored Alive Counter Incorrect
DTC C0561 74
- System Disabled Information Stored Value of Signal Protection Calculation Incorrect
DTC C0561 75
- System Disabled Information Stored Signal Above Allowable Range
Circuit/System Description
The electronic brake control module (EBCM) receives data from other Modules (ECM, BCM, TCM, TCCM, and Hybrid Control Module) and the yaw rate sensor/lateral accelerometer sensor which are needed to perform brake control functions. The EBCM must ensure that all serial data and sensor inputs are properly received and learned.
Conditions for Running the DTC
* Ignition ON.
* Ignition voltage is greater than 10 volts.
Conditions for Setting the DTC
DTC C0561 4B
This diagnostics detects if one or more of the module learning steps was not performed or failed during component replacement (New ECU/reprogrammed ECU).
DTC C0561 54
This diagnostics detects an over temperature condition with 1 of the 12 solenoids due to an extended ABS, traction control and the vehicle stability enhancement system event lasting more than 45 seconds.
DTC C0561 59
This diagnostics detects if the ABS motor is continuously ON for greater than 60 seconds during the same ignition cycle due to; Pedal pumping, poor service bleed, or a hydraulic leak.
DTC C0561 71, 72, 74, and 75
The EBCM receives an invalid serial data message/signal from another module which causes the EBCM to deactivate the antilock brake system, traction control and the vehicle stability enhancement system.
Action Taken When the DTC Sets
* The EBCM disables the antilock brake system, traction control and the vehicle stability enhancement system for the duration of the ignition cycle.
* A driver information center message and/or a warning indicator may be displayed.
Conditions for Clearing the DTC
* The condition for the DTC is no longer present.
* It may take 2 ignition cycles to clear this DTC.
* The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.
Diagnostic Aids
DTC C0561 4B
The module set up was not performed after a programming event or the EBCM Relearn failed.
This DTC may set during a battery disconnect.
DTC C0561 54
Excessive traction control event for greater than 45 seconds.
DTC C0561 59
Excessive brake pedal applies (10 or more applies in 30 seconds) can cause the DTC to set.
DTC C0561 71
This DTC may set after a programming event and will only clear after the engine has been started.
Reference Information
Schematic Reference
Antilock Brake System Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
ABS Description and Operation (Without JL4) (ABS (Without JL4))ABS Description and Operation (With JL4) (ABS (With JL4))
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
DTC C0561 4B and DTC C0561 59
This diagnostic detects if the pressure sensor calibration is correct.
Note: The battery must be able to maintain a charge during this procedure. It is recommended that a charger/maintainer or equivalent be used to maintain proper battery voltage during this procedure.
1. Ignition ON, engine OFF, using a scan tool access the EBCM, Module Setup screen, and perform the EBCM Relearn. The relearn procedure will verify valve and pressure sensor calibrations are correct.
Note: To ensure the complete brake modulator and high pressure accumulator pressure relief procedure is allowed to occur; the brake controller must see one brake pedal apply with the engine running followed by a proper shutdown without applying the brake pedal.
2. Transmission in PARK, engine running, apply and release the brake pedal.
Note: The ignition must transition to the OFF position without pausing at ACCESSORY and without applying the brake pedal. This ensures that the brake modulator and high pressure accumulator relief occurs. This process will take approximately 1-2 minutes.
3. Ignition OFF, key removed from the ignition, wait 2 minutes.
Note: The ignition must remain in the ON position with the engine OFF during the following steps.
4. Ignition ON, brake pedal released, verify the following EBCM scan tool parameters are within the specified range:
* BMC Prim. Piston Pos. Sen. 5 V Reference Position - Between 4.75 - 5.25 V
* BMC Primary Piston Position Sensor A - Between 0.4 - 0.8 V
* BMC Primary Piston Position Sensor B - Between 4.2 - 4.6 V
• If any of the parameters are not within the specified range, refer to DTC C0277, C120C, C129A, C129B, C129D, C129E, C12B1, or C12F8 (Antilock Brake System - Hybrid (HP2)).
5. Brakes not applied, verify the following EBCM scan tool parameters are within the specified range:
* Master Cylinder Pressure Sensor Input - Less than 100 kPa (15 psi)
* Rear Brake Pressure Sensor - Less than 100 kPa (15 psi)
* Brake Pressure Sensor Input - Less than 100 kPa (15 psi)
* Accum. Pressure Sensor - Less than 800 kPa (116 psi)
• If any of the parameters are not within the specified range, replace the brake pressure modulator valve.
6. Perform a hydraulic check, refer to Brake Hydraulic and Assist System Diagnosis (Two-mode Hybrid) (Brake Hydraulic and Assist System Diagnosis).
DTC C0561 54
This diagnostic detects an over temperature condition with 1 of the 12 solenoids due to an extended ABS, traction control and the vehicle stability enhancement system event lasting more than 45 seconds. This does not indicate a failure with the EBCM. If the DTC continues to set under normal conditions, then replace the EBCM.
DTC C0561 71, 72, 74, and 75
This diagnostic detects invalid serial data from another module which causes the EBCM to deactivate ABS, traction control and the vehicle stability enhancement system.
1. Use the scan tool Enhanced Diagnostics Data screen to determine which module is transmitting the invalid signal.
2. The module that is transmitting the invalid data should not have any DTCs set.
• If the module has a DTC set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).
3. If the module has no DTCs set, refer to DTC U0100-U02FF (with HP2) (U0100)DTC U0100-U02FF (without HP2) (U0100).
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedures:
* Brake Pressure Modulator Valve Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for EBCM replacement, setup, relearn, and programming