For 1990-2009 cars only
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 CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
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 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 signal voltage ranging from 0.13-3.30 volts and is monitored by EBCM.
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
The brake booster sensor signal voltage is not within 0.13-3.30 volts for more than 1 second.
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | The EBCM 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.
- Ignition OFF for 60 seconds, test for less than 11 ohms between the low reference circuit terminal 2 and ground.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 and ground.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 and the signal circuit terminal 1.
- Ignition OFF, disconnect the harness connector at the EBCM.
- Ignition OFF, test for infinite resistance between the signal circuit terminal 1 and ground.
- If all circuits test normal, test or replace the brake booster vacuum sensor.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM. |
| ⇒ | If less than the specified range, test the 5-volt reference circuit for an open/high resistance. If the circuit tests normal, replace the replace the EBCM. |
| ⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to B+. 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 than the specified range, test the signal circuit for a short to B+. If the circuit tests normal, replace the EBCM. |
| ⇒ | If not the specified value, test the signal circuit for a short to ground. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for EBCM replacement, setup, and programming |
