2010 Cadillac Truck SRX AWD V6-3.0L Page 1520
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.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the K20 Engine Control Module.
4. If all circuits test normal, replace the appropriate fuel level sensor.
Repair Instructions
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
P0464
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
