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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> Fuel Pump Electrical Circuit Diagnosis >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF.
  2. Disconnect the KR23A fuel pump relay.
  3. Test for 70 - 110 Ω between terminals 85 and 86.
    • If not between 70 - 110 Ω 

      Replace the KR23A fuel pump relay.

    • Go to next step: If between 70 - 110 Ω 
  4. Test for infinite resistance between the following terminals:
    • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    • If less than infinite resistance 

      Replace the KR23A fuel pump relay.

    • Go to next step: If infinite resistance 
  5. Install a 20 A fused jumper wire between relay terminal 85 and 12 V.
  6. Install a jumper wire between relay terminal 86 and ground.
  7. Test for less than 2 Ω between terminals 30 and 87.
    • If 2 Ω or greater 

      Replace the KR23A fuel pump relay.

    • Go to next step: If 2 Ω or less 
  8. All OK
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