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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 >> 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. Remove the KR22 Fuel Heater Relay from X50A Fuse Block-Underhood.
  3. Test for 70 - 110 Ω between terminals 85 and 86.
    • If not between 70 - 110 Ω 

      Replace the KR22 Fuel Heater Relay.

    • Go to next step: If between 70 - 110 Ω 
  4. Test for infinite resistance between the following terminals:
    • C3/30 and B3/86
    • C3/30 and B1/87
    • C3/30 and C1/85
    • C1/85 and B1/87
    • If less than infinite resistance 

      Replace the KR22 Fuel Heater Relay.

    • Go to next step: If infinite resistance 
  5. Install a 20 A fused jumper wire between relay terminal B3/86 and 12 V.
  6. Install a jumper wire between relay terminal C1/85 and ground.
  7. Test for less than 2 Ω between terminals C3/30 and B1/87.
    • If 2 Ω or greater 

      Replace the KR22 Fuel Heater Relay.

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