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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P0627-P0629 >> 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.

Relay Test

  1. Ignition/Vehicle - Off
  2. Remove the component: KR23A Fuel Pump Relay
  3. Test for 70 to 110 ohms between the test points: Component terminal 85 & 86
    • If not between 70 and 110 ohms 

      Replace the component: KR23A Fuel Pump Relay

    • Go to next step: If between 70 and 110 ohms 
  4. Test for infinite resistance between the test points:
    • Component terminal 30 & 86
    • Component terminal 30 & 87
    • Component terminal 30 & 85
    • Component terminal 85 & 87
    • If less than infinite resistance 

      Replace the component: KR23A Fuel Pump Relay

    • Go to next step: If infinite resistance 
  5. Connect a 3 A fused jumper wire between the test points: Component terminal 85 & B+

    Connect a jumper wire between the test points: Component terminal 86 & Ground

  6. Test for less than 2 ohms between the test points: Component terminal 30 & Component terminal 87
    • If 2 ohms or greater 

      Replace the component: KR23A Fuel Pump Relay

    • Go to next step: If less than 2 ohms 
  7. All OK.
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