Diagnostic 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 Descriptor
DTC C1100 00: Base Brake System Pressure SensorDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Brake Booster Vacuum 5-Volt Reference | C1100 00 | C1100 00 | C1100 00 | -- |
Signal | C1100 00 | C1100 00 | C1100 00 | -- |
Low Reference | -- | C1100 00 | -- | -- |
Circuit/System Description
The electronic brake control module (EBCM) provides a power 5-volt reference to the brake booster vacuum sensor. The brake booster vacuum sensor converts the change in vacuum levels in the brake booster into a voltage signal. This signal is sent to the EBCM. The voltage signal ranges, from 0.13-3.30 volts depending on vacuum levels. The low reference is the return side of the sensor to ground.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | Ignition voltage is greater than 9 volts. |
Conditions for Setting the DTC
| • | Voltage at the brake booster sensor signal output to the EBCM falls outside the 0.13-3.30 volts range for more than 200 milliseconds. |
| • | The power 5-volts reference is shorted to ground or battery positive. |
Action Taken When the DTC Sets
The red BRAKE Warning indicator turns ON.
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Antilock Brake System Connector End Views
Description and Operation
Electrical Information Reference
| • | Circuit Testing |
| • | Wiring Repairs |
Scan Tool Reference
Scan Tool Data List for EBCM
Circuit/System Verification
DTC C1100 will set as result of power brake booster vacuum sensor or circuit failure, test for power and ground circuits to the EBCM.
| ⇒ | Repair the power or ground circuits. |
Circuit/System Testing
- Ignition OFF, disconnect the 3 way harness connector at the brake booster vacuum sensor.
- Test for less than 1.0 ohm between the low reference circuit terminal 2 and ground.
- Ignition ON, test for 4.5-5.3 volts between the 5-volt reference circuit terminal 3 and ground.
- Test for 4.5-5.3 volts between the 5-volt reference circuit terminal 3 and the signal circuit terminal 1.
- If all circuits test normal, test or replace the brake booster vacuum sensor.
| ⇒ | If greater than 1.0 ohm, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM. |
| ⇒ | If less than 4.5 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM. |
| ⇒ | If greater than 5.3 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM. |
| ⇒ | If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the EBCM. |
| ⇒ | If greater specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming
