C1100
DTC C1100Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC C1100 00
Brake Pressure Sensor 2 Malfunction
DTC C1100 01
Brake Pressure Sensor 2 Short to Battery
DTC C1100 02
Brake Pressure Sensor 2 Short to Ground
DTC C1100 08
Brake Pressure Sensor 2 Performance - Signal Invalid
DTC C1100 09
Brake Pressure Sensor 2 Too Fast Transitions
DTC C1100 5A
Brake Pressure Sensor 2 Not Plausible
Diagnostic Fault Information
Circuit/System Description
The brake booster vacuum sensor measures the vacuum in the brake booster assembly. The electronic brake control module (EBCM) supplies a 5 V reference and a low reference circuit to the brake booster vacuum sensor. The vacuum sensor supplies a voltage signal in relation to the pressure in the brake booster to the EBCM.
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
C1100 00
The vacuum sensor signal is out of the specified range.
C1100 01
The EBCM detected a short to voltage on the vacuum sensor 5 V reference circuit.
C1100 02
The EBCM detected a short to ground on the vacuum sensor 5 V reference circuit.
C1100 08, C1100 09, and C1100 5A
The vacuum sensor signal is not plausible.
Action Taken When the DTC Sets
The brake warning indicator turns ON.
Conditions for Clearing the DTC
- A current DTC clears when the diagnostic runs and passes.
- The EBCM will turn OFF the indicator in the next ignition cycle.
Reference Information
Schematic Reference
Hydraulic Brake Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Brake Assist System Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
1. Inspect the brake booster vacuum system for damage, leakage and correct installation.
2. If damage, leakage or incorrect installation is diagnosed, repair or replace the component.
3. Ignition OFF, disconnect the harness connector at the B19B Brake Booster Vacuum Sensor.
4. Test for less than 5 ohms between the low reference circuit terminal 2 and ground.
5. If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K17 Electronic Brake Control Module (EBCM).
6. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.
7. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K17 Electronic Brake Control Module (EBCM).
8. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K17 Electronic Brake Control Module (EBCM).
9. Verify the scan tool Brake Booster Vacuum Sensor Parameter is greater than 100 kPa (14.5 PSI).
10. If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the K17 Electronic Brake Control Module (EBCM).
11. Install a fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
12. Verify the scan tool Brake Booster Vacuum Sensor Parameter is less than 30 kPa (4 PSI).
13. If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K17 Electronic Brake Control Module (EBCM).
14. If all circuits test normal, replace the B19B Brake Booster Vacuum Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Power Brake Booster Vacuum Sensor Replacement
- Control Module References for EBCM replacement, setup, and programming