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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 2.0L (LTG) - DTC P0335 To DTC P2635 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0685-P0687, P0689, P0690, or P1682: Engine Controls Ignition Relay >> Component Testing

Component Testing

Relay Test

  1. Ignition OFF, disconnect the KR75 Engine Controls Ignition Relay.
  2. Test for 70-110Ω between terminal s85 and 86:
    • If less than 70Ω or greater than 110Ω 

      Replace the KR75 Engine Controls Ignition Relay.

    • If between 70-110Ω 
  3. Test for infinite resistance between the terminal s listed below:
    • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    • If less than infinite resistance 

      Replace the KR75 Engine Controls Ignition Relay.

    • If infinite resistance 
  4. Install a 20A fused jumper wire between relay terminal 85 and 12V. Install a jumper wire between relay terminal 86 and ground.
  5. Test for less than 2Ω between terminal s30 and 87.
    • If 2Ω or greater 

      Replace the KR75 Engine Controls Ignition Relay.

    • If less than 2Ω 
  6. All OK.