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 Presure Sensor 2
Diagnostic Fault Information
Circuit/System Description
The Brake Booster Vacuum Sensor measures the vacuum in the Brake Booster assembly. 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 Electronic Brake Control Module detects a fault in the brake vacuum senor or circuits.
Action Taken When the DTC Sets
The red Brake warning indicator turns ON.
Conditions for Clearing the DTC
* A current DTC clears when the diagnostic runs and passes.
* The Electronic Brake 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 Booster Vacuum Assist Description and Operation Brake Booster Vacuum Assist
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, disconnect the harness connector at the Brake Booster Vacuum Sensor.
2. Ignition OFF, test for less than 10 ohms between the low reference circuit terminal 2 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the Electronic Brake Control Module.
3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.
• 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 Electronic Brake Control Module.
• If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the Electronic Brake Control Module.
4. Ignition ON, test for 4.5-5.2 V between the 5 V reference circuit terminal 3 and the signal circuit terminal 1.
• If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the Electronic Brake Control Module.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the Electronic Brake Control Module.
5. Ignition OFF, disconnect the X1 harness connector at the Electronic Brake Control Module.
6. Ignition OFF, test for infinite resistance between the signal circuit terminal 10 and ground.
• If not the specified value, test the signal circuit for a short to ground.
7. If all circuits test normal, test or replace the Brake Booster Vacuum Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)
* Control Module References Control Module References for Electronic Brake Control Module replacement, programming and setup