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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> Proactive Alert Identifier ECF002 >> Circuit/System Verification

Circuit/System Verification

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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:G12 Fuel Pump
  3. Test for less than 5 Ω between the test points:Low Reference circuit terminal 2 & Ground
    • If 5 Ω or greater 
    1. Disconnect the electrical connector:K111 Fuel Pump Driver Control Module
    2. Test for less than 2 Ω between the test points:Low Reference circuit terminal 2 @ Component harness & Terminal 16 @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component:K111 Fuel Pump Driver Control Module
    • Go to next step: If less than 5 Ω 
  4. Connect a test lamp between the test points:Control circuit terminal 1 & Low Reference circuit terminal 2
  5. Ignition - On / Vehicle - In Service Mode
  6. Perform the scan tool control function:Fuel Pump @ K20 Engine Control Module - On and Off

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector:K111 Fuel Pump Driver Control Module
    3. Test for infinite resistance between the test points:Control circuit terminal 1 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points: Control circuit terminal 1 @ Component harness & Terminal 8 @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component:K111 Fuel Pump Driver Control Module
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector:K111 Fuel Pump Driver Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Control circuit terminal 1 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:K111 Fuel Pump Driver Control Module
    • Go to next step: If the test lamp turns On and Off 
  7. Test or replace the component:G12 Fuel Pump
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