2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1414
* The A/C compressor is disabled.
* The ECM will illuminate the malfunction indicator lamp (MIL).
Conditions for Clearing the DTC
The condition for setting the DTC is no longer present.
Reference Information
Schematic Reference
HVAC Schematics (See: Heating and Air Conditioning/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Automatic HVAC Description and Operation (See: Heating and Air Conditioning/Description and Operation)
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. Ignition OFF, disconnect the harness connector at the B1 A/C Refrigerant Pressure Sensor.
2. Ignition ON, test for 4.8-5.2V between the 5V reference circuit terminal 2 and ground.
瀚慖f less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace K20 Engine Control Module.
瀚慖f greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine
Control Module.
3. Test for 4.8-5.2V between the 5V reference circuit terminal 2 and the low reference circuit terminal 1.
瀚慖f less than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace K20 Engine
Control Module.
瀚慖f greater than the specified range, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine
Control Module.
4. Verify the scan tool A/C High Side Pressure Sensor parameter is less than 0.3V.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control
Module.
5. Install a 3A fused jumper wire between the following signal circuit terminal 3 and the 5V reference circuit terminal 2. Verify the scan tool
A/C high side pressure sensor parameter is greater than 4.8V.
瀚慖f less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the
K20 Engine Control Module.
6. If all circuits test normal, replace the B1 A/C Refrigerant Pressure Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* HVAC Component Replacement Reference (See: Heating and Air Conditioning/Service and Repair/Removal and Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning)
