2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2521
module will not allow the A/C compressor to operate.
Conditions for Running the DTC
* Engine is running.
* Any of the conditions for setting the DTC are met for 15 seconds.
Conditions for Setting the DTC
* The HVAC control module detects that the A/C pressure is less than 2.03 psi (14 kPa) sets DTC P2518 12.
* The HVAC control module detects that the A/C pressure is more than 101.5 psi (700 kPa) sets DTC P2518 11.
Action Taken When the DTC Sets
The A/C compressor is disabled.
Conditions for Clearing the DTC
* The history DTC will clear after 40 consecutive ignition cycles have occurred without a malfunction.
* The DTC will become history if the HVAC control module no longer detects a failure.
Diagnostic Aids
A malfunction within the refrigerant system causing high pressure can cause this DTC to set.
Reference Information
Schematic Reference
HVAC Schematics (See: Heating and Air Conditioning/Diagrams/Electrical Diagrams/HVAC - Automatic)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
* Air Delivery Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air Delivery
Description and Operation)
* Air Temperature Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air
Temperature 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 Verification
Ignition ON, observe the scan tool Low Pressure Switch parameter. The parameter should read closed.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the A/C refrigerant pressure sensor.
2. Ignition OFF, test for less than 10 ohms between the low reference circuit terminal 1 and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 2 and ground.
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage.
Diagnostic Repair parts ,Wiring Diagrams. DTC. TSB,Car, Truck, SUV & Van Acura Chrysler Infiniti Maserati Rolls-Royce Alfa Romeo Dodge Jaguar Mazda Scion Aston Martin Ferrari Jeep McLaren Smart Audi Fiat Karma Mercedes-Benz Spyker BMW Ford Kia Mini Subaru Bentley Freightliner Lamborghini Mitsubishi Tesla Bugatti GMC Land Rover Mobility Ventures Toyota Buick Genesis Lexus Nissan Volkswagen Cadillac Honda Lincoln Porsche Volvo Chevrolet Hyundai Lotus Ram