2010 Cadillac Truck SRX AWD V6-3.0L Page 880
The vacuum sensor signal is not plausible.
Action Taken When the DTC Sets
The brake warning indicator turns ON.
Conditions for Clearing the DTC
* A current DTC clears when the diagnostic runs and passes.
* The EBCM will turn OFF the indicator in the next ignition cycle.
Reference Information
Schematic Reference
Hydraulic Brake Schematics (See: Brakes and Traction Control/Hydraulic System/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Brake Assist System Description and Operation (See: Brakes and Traction Control/Hydraulic System/Description and Operation/Brake Assist
System)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Testing
1. Inspect the brake booster vacuum system for damage, leakage and correct installation.
瀚慖f damage, leakage or incorrect installation is diagnosed, repair or replace the component.
2. Ignition OFF, disconnect the harness connector at the B19B Brake Booster Vacuum Sensor.
3. Test for less than 5 ohm between the low reference circuit terminal 2 and ground.
瀚慖f 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).
4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.
瀚慖f 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).
瀚慖f 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).
5. Verify the scan tool Brake Booster Vacuum Sensor Parameter is greater than 100 kPa (14.5 PSI).
瀚慖f 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).
6. Install a fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
7. Verify the scan tool Brake Booster Vacuum Sensor Parameter is less than 30 kPa (4 PSI).
瀚慖f 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).
8. If all circuits test normal, replace the B19B Brake Booster Vacuum Sensor.
