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2010 Cadillac Truck SRX AWD V6-3.0L Page 1540

2010 Cadillac Truck SRX AWD V6-3.0L Page 1540



* 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



Note: Because of normal system communications between the BCM and ECM, any immobilizer B-codes must be diagnosed prior to the diagnosis



of P-codes.



Perform the BCM immobilizer learn using the Body Control Module IMMO Function with Existing Transponder or Remote Key in SPS. Refer to



Immobilizer System Component Programming (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Testing and



Inspection/Programming and Relearning). The BCM should successfully complete the learn and the vehicle should start.



If vehicle starting is not restored, perform the ECM immobilizer learn using the Engine Control Module IMMO Learn in SPS. Refer to Immobilizer



System Component Programming (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Testing and Inspection/Programming



and Relearning).



P0520



DTC P0520



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions)provides an overview of each diagnostic category.



DTC Descriptor



DTC P0520



- Engine Oil Pressure Switch Circuit Malfunction



Diagnostic Fault Information



Typical Scan Tool Data



Circuit/System Description



The engine oil pressure switch is a normally closed switch that opens with the proper oil pressure. With the ignition switch turned ON and the



engine not running, the engine control module (ECM) should detect a low signal voltage input. With the engine running, the engine oil pressure



switch opens and the ECM should detect a high signal voltage input. When the oil pressure is low, the ECM sends a message via High Speed



CAN-Bus to the body control module (BCM). The BCM then sends a message via Low Speed CAN-Bus to the instrument cluster requesting the



engine oil pressure indicator turned ON.

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