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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC P0461-P0464: Fuel Level Sensor Circuit >> Circuit/System Testing

Circuit/System Testing

  1. Ignition/Vehicle & All vehicle systems - Off
    NOTE: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
  2. Disconnect the electrical connector: A7 Fuel Pump and Level Sensor Assembly
  3. Test for less than 10 Ω between the test points:Low Reference circuit terminal 6 & Ground
    • If 10 Ω or greater 
    1. Disconnect the electrical connector: K20 Engine Control Module
    2. Test for less than 2 Ω between the test points: Low Reference circuit terminal @ Component harness & The other end of the circuit
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component:K20 Engine Control Module
    • If less than 10 Ω 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify the scan tool parameter: Remaining Fuel in Tank=Less than 5%
    • If 5% or greater 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K20 Engine Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 5 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:K20 Engine Control Module
    • If less than 5% 
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 5 & Low Reference circuit terminal 6
  7. Verify the scan tool parameter: Remaining Fuel in Tank=If 90% or greater
    • If less than 90% 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: K20 Engine Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 Ω between the test points: Signal circuit @ Component harness & The other end of the circuit
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component: K20 Engine Control Module
    • If 90% or greater 
  8. Test or replace the component: B46 Fuel Level Sensor
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