Monday, February 21, 2022

2010 Cadillac Truck SRX FWD V6-3.0L Page 1920

2010 Cadillac Truck SRX FWD V6-3.0L Page 1920



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Primary Fuel Level Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Fuel Level Sensor/Service and



Repair)



* Secondary Fuel Tank Module Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Tank Unit/Service and



Repair/Secondary Fuel Tank Module Replacement)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for the ECM replacement, programming and setup



P2068



DTC P0461-P0464, P2066, P2067, or P2068



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 Descriptors



DTC P0461



- Fuel Level Sensor 1 Performance



DTC P0462



- Fuel Level Sensor 1 Circuit Low Voltage



DTC P0463



- Fuel Level Sensor 1 Circuit High Voltage



DTC P0464



- Fuel Level Sensor Circuit Intermittent



DTC P2066



- Fuel Level Sensor 2 Performance



DTC P2067



- Fuel Level Sensor 2 Circuit Low Voltage



DTC P2068



- Fuel Level Sensor 2 Circuit High Voltage



Diagnostic Fault Information



Circuit/System Description



The primary fuel level sensor and the secondary fuel level sensor change resistance based on fuel level. The engine control module (ECM) monitors



the signal circuits of the primary fuel level sensor and the secondary fuel level sensor in order to determine the fuel level. When the fuel tank is full,



the resistances of both fuel level sensors are low and the ECM senses a low signal voltage on both the signal circuits of the primary fuel level



sensor and the secondary fuel level sensor. When the fuel tank is empty, the resistances of the fuel level sensors are high and the ECM senses a high



signal voltage. The ECM uses the signal circuits of the primary fuel level sensor and the secondary fuel level sensor in order to calculate the



percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via High Speed CAN-Bus to the body control module (BCM).



The BCM then sends the fuel level percentage via Low Speed CAN-Bus to the instrument cluster in order to control the fuel gauge.



Conditions for Running the DTC



* The engine is running



* The system voltage is between 11-16 V

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