P0464
DTC P0464
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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
* The fuel gauge defaults to empty.
* The low fuel indicator illuminates
Conditions for Clearing the DTC
* The DTC clears when the fault is no longer detected.
* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred
Reference Information
Schematic Reference
Instrument Cluster Schematics Instrument Cluster Schematics
Connector End View Reference
Component Connector End Views A/C Compressor Clutch
Description and Operation
Fuel Gauge Description and Operation Fuel Gauge
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Circuit/System Verification
Ignition ON, observe the scan tool ECM Secondary Fuel Level Sensor parameter. The reading should be between 0.9-4.98 V.
Circuit/System Testing
Note:
If equipped, the following tests can be performed at an inline connector. See schematics for the appropriate circuit terminals.
1. Ignition OFF, disconnect the harness connectors at the fuel pump and sender assembly.
2. Test for less than 1.0 ohms between the low reference circuit terminal 4 and ground.
• If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, verify the scan tool ECM Secondary Fuel Level Sensor parameter is greater than 4.75 V.
• If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
4. Connect a 3 A fused jumper wire between the signal circuit terminal 1 and ground, verify the scan tool ECM Secondary Fuel Level Sensor parameter is less than 1 V.
• If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
5. If all circuits test normal, test or replace the fuel pump and sender assembly.
Component Testing
Note:
This DTC only sets when test parameters indicate that an intermittent condition has occurred on multiple occasions. If the fault is not present do not replace components. Test again, as you perform action to induce the intermittent fault (moving harnessess, terminals and connectors, etc.) while observing the test readings.
1. Ignition OFF, disconnect the harness connector at the fuel pump and sender assembly.
2. Remove the fuel pump and sender assembly from the fuel tank.
3. While sweeping the primary fuel level sensor through its full range of motion, test for a minimum value less than 41 ohms and a maximum value greater than 119 ohms between signal terminal 1 and the low reference terminal 4.
• If not within the specified range, replace the fuel pump and sender assembly.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Fuel Tank Fuel Pump Module Replacement - Right Side Fuel Tank Fuel Pump Module Replacement - Right Side
* Control Module References Control Module References for ECM replacement, setup and programming