2010 Cadillac Truck SRX FWD V6-3.0L Page 1513

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