C1100
DTC C1100
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 C1100 00
- Brake Pressure Sensor 2
DTC C1100 01
- Brake Pressure Sensor 2 Short to Battery
DTC C1100 02
- Brake Pressure Sensor 2 Short to Ground
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 monitors the pressure in the brake booster. The electronic brake control module 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 electronic brake control module.
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
C1100 00
* A short to ground, short to voltage or open/high resistance is detected on the signal circuit.
* An open/high resistance is detected on the 5 V reference circuit.
* An open/high resistance is detected on the low reference circuit.
* The electronic brake control module detects an erratic vacuum sensor signal.
C1100 01
A short to voltage is detected on the vacuum sensor 5 V reference circuit.
C1100 02
A short to ground is detected on the vacuum sensor 5 V reference circuit.
C1100 09
The vacuum sensor signal too fast transitions.
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 electronic control module will turn OFF the indicator in the next ignition cycle.
Reference Information
Schematic Reference
Hydraulic Brake Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Brake Assist System Description and Operation Brake Assist System
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 Control Module References for scan tool information
Circuit/System Testing
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B19B Brake Booster Vacuum Sensor. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground.
• If 10 ohms or greater
1. Disconnect the harness connector at the K17 Electronic Brake Control Module.
2. Test for less than 2 ohms in the low reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K17 Electronic Brake Control Module.
• If less than 10 ohms
3. Ignition ON.
4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.
• If less than 4.8 V
1. Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module.
2. Test for infinite resistance between the 5 V reference circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the 5 V reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K17 Electronic Brake Control Module.
• If greater than 5.2 V
1. Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module, ignition ON.
2. Test for less than 1 V between the 5 V reference circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K17 Electronic Brake Control Module.
• If between 4.8-5.2 V
5. Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module, ignition ON.
6. Test for less than 1 V between the B19B Brake Booster Vacuum Sensor signal circuit terminal 1 and ground.
• If greater than 1 V
Repair the short to voltage on the circuit.
• If less than 1 V
7. Ignition OFF.
8. Test for infinite resistance between the B19B Brake Booster Vacuum Sensor signal circuit terminal 1 and ground.
• If less than infinite resistance
Repair the short to ground on the circuit.
• If infinite resistance
9. Test for less than 2 ohms between the B19B Brake Booster Vacuum Sensor signal circuit terminal 1 and the K17 Electronic Brake Control Module signal circuit terminal 4.
• If 2 ohms or greater
Repair the open/high resistance in the circuit.
• If less than 2 ohms
10. Replace the B19B Brake Booster Vacuum Sensor.
11. Verify the DTC does not set while operating the vehicle under Conditions for Running the DTC.
• If the DTC sets
Replace the K17 Electronic Brake Control Module.
• If the DTC does not set
12. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Service and Repair for Power Brake Booster Vacuum Sensor Replacement
* Control Module References Control Module References for Electronic Brake Control Module replacement, programming and setup