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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0685, P0686, P0687, P0689, P0690 Or P1682: Engine Controls Ignition Relay Control Circuit >> Component Testing >> Relay Test

Relay Test

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Remove the component:KR75 Engine Controls Ignition Relay
  3. Test for 70 to 110 Ω between the test points:Component terminal 85 & 86
    • If not between 70 and 110 Ω 

      Replace the component:KR75 Engine Controls Ignition Relay

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

      Replace the component:KR75 Engine Controls Ignition Relay

    • Go to next step: If infinite resistance 
  5. Connect a 3 A fused jumper wire between the test points:Component terminal 86 & B+

    Connect a jumper wire between the test points:Component terminal 85 & Ground

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

      Replace the component: KR75 Engine Controls Ignition Relay

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