DTC C1100
| DTC C1100 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC C1100 00
Brake Pressure Sensor 2 Malfunction
DTC C1100 01
Brake Pressure Sensor 2 Short to Battery
DTC C1100 02
Brake Pressure Sensor 2 Short to Ground
DTC C1100 08
Brake Pressure Sensor 2 Performance - Signal Invalid
DTC C1100 09
Brake Pressure Sensor 2 Too Fast Transitions
DTC C1100 5A
Brake Pressure Sensor 2 Not Plausible
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| 5 V Reference | C1100 00, C1100 02 | C1100 00, C1100 08 | C1100 00, C1100 01 | - |
| Signal | C1100 00, C1100 02 | C1100 00 | C1100 00, C1100 01 | C1100 08, C1100 09, C1100 5A |
| Low Reference | - | C1100 00 | - | - |
| Circuit/System Description |
The brake booster vacuum sensor measures the vacuum in the brake booster assembly. The electronic brake control module (EBCM) 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 EBCM.
| Conditions for Running the DTC |
Ignition ON.
| Conditions for Setting the DTC |
C1100 00
The vacuum sensor signal is out of the specified range.C1100 01
The EBCM detected a short to voltage on the vacuum sensor 5 V reference circuit.C1100 02
The EBCM detected a short to ground on the vacuum sensor 5 V reference circuit.C1100 08, C1100 09, and 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 |
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A current DTC clears when the diagnostic runs and passes.
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The EBCM will turn OFF the indicator in the next ignition cycle.
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| Reference Information |
Schematic Reference
Hydraulic Brake Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Brake Assist System Description and Operation
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Testing |
| 1. |
Inspect the brake booster vacuum system for damage, leakage and correct installation.
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| 2. |
If damage, leakage or incorrect installation is diagnosed, repair or replace the component.
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| 3. |
Ignition OFF, disconnect the harness connector at the B19B Brake Booster Vacuum Sensor.
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| 4. |
Test for less than 5 Ω between the low reference circuit terminal 2 and ground.
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| 5. |
If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K17 Electronic Brake Control Module (EBCM).
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| 6. |
Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.
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| 7. |
If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K17 Electronic Brake Control Module (EBCM).
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| 8. |
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 K17 Electronic Brake Control Module (EBCM).
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| 9. |
Verify the scan tool Brake Booster Vacuum Sensor Parameter is greater than 100 kPa (14.5 PSI).
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| 10. |
If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the K17 Electronic Brake Control Module (EBCM).
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| 11. |
Install a fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
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| 12. |
Verify the scan tool Brake Booster Vacuum Sensor Parameter is less than 30 kPa (4 PSI).
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| 13. |
If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K17 Electronic Brake Control Module (EBCM).
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| 14. |
If all circuits test normal, replace the B19B Brake Booster Vacuum Sensor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Power Brake Booster Vacuum Sensor Replacement
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Control Module References
for EBCM replacement, setup, and programming
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