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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 >> Ignition Relay 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.

Relay Test

  1. Ignition OFF, disconnect the KR75 Engine Controls Ignition Relay.
  2. Test for 70 - 110 Ω between terminals 85 and 86 or 1 and 2 of the relay.
    • If not within 70 - 100 Ω 

      Replace the relay.

    • Go to next step: If within 70 - 100 Ω 
  3. Test for infinite resistance between the following terminals listed below:
    • 30 and 86 or 3 and 1
    • 30 and 87 or 3 and 5
    • 30 and 85 or 3 and 2
    • 85 and 87 or 2 and 5
      • If less than infinite resistance 

        Replace the relay.

      • Go to next step: If infinite resistance 
  4. Install a 20 A fused jumper wire between relay terminal 85 and B+. Install a jumper wire between relay terminal 86 or 1 and ground.
  5. Test for less than 2 Ω between terminals 30 and 87.
    • If 2 Ω or greater 

      Replace the relay.

    • Go to next step: If less than 2 Ω 
  6. All OK.
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