2010 Cadillac CTS Sedan AWD V6-3.6L Page 766
1. Engine running, measure and record the voltage at the battery terminals.
2. Verify that the battery voltage is 12.6-15.5 V.
瀚慖f the battery voltage is not within the specified range, refer to Charging System Test (See: Starting and Charging/Testing and
Inspection/Component Tests and General Diagnostics/Charging System Test)
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the electronic park brake module(EPB).
2. Ignition OFF, test for less than 3 Ohms between the ground circuit terminal H and ground.
瀚慖f greater than the specified value, test the ground circuit for an open/high resistance.
3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal A and ground.
瀚慖f the test lamp does not illuminate , test the circuit for an open/high resistance.
4. If all circuits test normal, test or replace the EPB.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for EPB replacement, setup, and programming
C0890
DTC C0277 or C0890
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC C0277 06
- Brake Pedal Position Sensor Circuit Short to Ground or Open
DTC C0277 07
- Brake Pedal Position Sensor Circuit Voltage Above Threshold
DTC C0277 09
- Brake Pedal Position Sensor Circuit Rate of Change Above Threshold
DTC C0277 4B
- Brake Pedal Position Sensor Calibration Not Learned
DTC C0890 03
- Device Voltage Reference Output 3 Circuit Voltage Below Threshold
DTC C0890 07
- Device Voltage Reference Output 3 Circuit Voltage Above Threshold
Diagnostic Fault Information
