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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information And Procedures >> DTC P0461-P0464: Fuel Level Sensor (FWD With Gasoline Engine) >> Circuit/System Testing

Circuit/System Testing

    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.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector:A7 Fuel Pump and Level Sensor Assembly
  3. Test for less than 10 ohms between the test points:Low Reference circuit terminal 6 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector:K20 Engine Control Module
    2. Test for less than 2 ohms between the test points:Low Reference circuit terminal@Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K20 Engine Control Module
    • Go to next step: If less than 10 ohms 
  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
    • Go to next step: 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 ohms between the test points:Signal circuit@Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K20 Engine Control Module
    • Go to next step: If 90 % or greater 
  8. Test or replace the component:B46 Fuel Level Sensor
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