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: Brake Booster Vacuum Sensor PerformanceDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Brake Booster Vacuum 5-Volt Reference Circuit | C1100 | C1100 | C1100 | -- |
Signal Circuit | C1100 | C1100 | C1100 | -- |
Low Reference Circuit | -- | C1100 | -- | -- |
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
One or more of the following actions may occur:
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
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for Scan Tool Information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the brake booster vacuum sensor.
- Test for less than 3.0 ohm of resistance between the low reference circuit terminal A and ground.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal B and ground.
- Test for 4.5-5.3 volts between the 5-volt reference circuit terminal B and the signal circuit terminal C.
- Install a 3A fused jumper wire at the signal circuit terminal C. Toggle the jumper wire between the low reference circuit terminal and the 5-volt reference circuit terminal B. Verify the scan tool brake booster vacuum sensor Input parameter toggles between 0.2-3.2 volts.
- If all circuits test normal, test or replace the brake booster vacuum sensor.
| ⇒ | If greater than 3.0 ohm, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM. |
| ⇒ | If less than 4.8 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 5.2 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. |
| ⇒ | If the specified parameter, does not toggle between the minimum and maximum values test the signal circuit for a short to voltage, short to ground or an open/high resistance. 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
