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 02
- Brake Pressure Sensor 2 Short to Ground

DTC C1100 04
- Brake Pressure Sensor 2 Open

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

* The EBCM detected an erratic vacuum sensor signal.

* A short to ground, short to voltage or open/high resistance is detected on the 5 V reference circuit.

C1100 02

A short to voltage is detected on the vacuum sensor signal circuit.

C1100 04

A short to ground or open/high resistance is detected on the vacuum sensor signal circuit.

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 Outside Rearview Mirror - Driver

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. Ignition OFF, 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 OFF, disconnect the harness connector at the K17 Electronic brake control module.

4. Test for infinite resistance between the circuits listed below and ground:

* 5 V reference circuit terminal 3

* Signal circuit terminal 1

• If less than infinite resistance
Repair the short to ground on the circuit.

• If infinite

5. Test for less than 2 ohms in the circuits listed below end to end:

* 5 V reference circuit terminal 3

* Signal circuit terminal 1

• If 2 ohms or greater
Repair the open/high resistance in the circuit.

• If less than 2 ohms

6. Ignition ON.

7. Test for less than 1 V between the circuits listed below and ground:

* 5 V reference circuit terminal 3

* Signal circuit terminal 1

• If 1 V or greater
Repair the short to voltage on the circuit.

• If less than 1 V

8. Replace the B19B Brake booster vacuum sensor.

9. Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC.

• If the DTC sets
Replace the K17 Electronic brake control module.

• If the DTC does not set

10. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Power Brake Booster Vacuum Sensor Replacement Service and Repair

* Control Module References Control Module References for Electronic Brake Control Module replacement, programming and setup.