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 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 (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
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 (Programming and Relearning)for scan tool information

Circuit/System Testing

1. Inspect the brake booster vacuum system for damage, leakage and correct installation.

• If damage, leakage or incorrect installation is diagnosed, repair or replace the component.

2. Ignition OFF, disconnect the harness connector at the B19B Brake Booster Vacuum Sensor.
3. Test for less than 5 ohm between the low reference circuit terminal 2 and ground.

• 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).

4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

• 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).
• 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).

5. Verify the scan tool Brake Booster Vacuum Sensor Parameter is greater than 100 kPa (14.5 PSI).

• 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).

6. Install a fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
7. Verify the scan tool Brake Booster Vacuum Sensor Parameter is less than 30 kPa (4 PSI).

• 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).

8. If all circuits test normal, replace the B19B Brake Booster Vacuum Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Power Brake Booster Vacuum Sensor Replacement (Service and Repair)
* Control Module References (Programming and Relearning)for EBCM replacement, setup and programming