2010 Cadillac Truck SRX FWD V6-3.0L Page 1513
瀚慖f the vacuum/pressure gauge shows vacuum, but the fuel tank pressure parameter does not show vacuum, replace the fuel tank pressure
sensor.
瀚慖f neither the fuel tank pressure parameter nor the vacuum/pressure gauge shows vacuum, repair the restriction in the purge path.
9. Verify that the vacuum increases to the abort limit on the scan tool or more than 3.2 V, and the values are similar between the scan tool and
the vacuum/pressure gauge on the J 41413-200 - EEST.
瀚慖f the values are not similar, or the voltage did not reach 3.2 V, replace the B150 fuel tank pressure sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Fuel Tank Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Fuel Tank Pressure Sensor/Service and
Repair)
P0461
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
