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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (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

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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.