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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 Heater Diagnosis >> Circuit/System Verification

Circuit/System Verification

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 ON.
  2. Command the Fuel Heater Relay On and Off with a scan tool. An audible click should be heard with each command.
    • Go to next step: If a audible click is heard 
  3. Verify with a scan tool that the Fuel Temperature Sensor parameter slowly starts to rise.
    • If the Fuel Temperature Sensor Parameter does not start to rise 

      Refer to Circuit/System Testing

    • Go to next step: If the Fuel Temperature Sensor Parameter rises 
  4. All OK
NOTE:

Perform the fuel heater relay Component Testing before proceeding to Circuit/System Testing.

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