2010 Cadillac CTS Sedan AWD V6-3.6L Page 1440
4. If all circuits test normal, perform the fuel level sensor component test before replacing the primary fuel level sensor.
Component Testing
1. Ignition OFF, remove the primary fuel level sensor.
2. While sweeping the primary fuel level sensor through its full range of motion, test for a minimum value less than 41 ohm and a maximum
value greater than 119 ohm between signal terminal 1 and the low reference terminal 4.
瀚慖f not within the specified range, replace the primary fuel level sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Fuel Level Sensor Replacement - Right Side (See: Powertrain Management/Computers and Control Systems/Fuel Level Sensor/Service and
Repair/Fuel Level Sensor Replacement - Right Side) for the 3.6L engine
* Fuel Level Sensor Replacement - Right Side (See: Powertrain Management/Computers and Control Systems/Fuel Level Sensor/Service and
Repair/Fuel Level Sensor Replacement - Right Side) for the 4.8L, 5.3L, 6.0L, 6.2L or 7.0L engines
* Control Module References (See: Testing and Inspection/Programming and Relearning) for the ECM replacement, setup, and programming
P0464
DTC P0464
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 P0464 00
- Fuel Level Sensor 1 Circuit Intermittent (LSA)
Diagnostic Fault Information
Circuit/System Description
The primary fuel level sender and the secondary fuel level sender changes resistance based on fuel level. The engine control module (ECM)
monitors the signal circuits of the primary fuel level sender and the secondary fuel level sender in order to determine the fuel level. When the fuel
tank is full, the resistances of both fuel level senders are low and the ECM senses a low signal voltage on both the signal circuits of the primary fuel
level sender and the secondary fuel level sender. When the fuel tanks are empty, the resistances of the fuel level senders are high and the ECM
senses a high signal voltage. The ECM uses the signal circuits of the primary fuel level sender and the secondary fuel level sender in order to
calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via serial data circuit 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 10-16 V.
* Fuel level state is stable.
Conditions for Setting the DTC
The ECM detects an erratic signal from the fuel pump and sender assembly for greater than 60 seconds.
Action Taken When the DTC Sets
