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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 123 (Engine Controls And Fuel - 3.6L (LF4) - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P0685-P0687, P0689, P0690, P1682, P16A7, P16AF, P16B3, P16BC, P16BD, or P16BF >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    For detailed component terminal information, refer to: Diagnostic Aids

  1. Ignition/Vehicle - Off
  2. Remove the component: KR75 Engine Controls Ignition Relay
  3. Test for 70 to 120 ohms between the test points: B+ - Relay Coil & Control - Relay Coil
    • If not between 70 and 120 ohms 

      Replace the component: KR75 Engine Controls Ignition Relay

    • Go to next step: If between 70 and 120 ohms 
  4. Test for infinite resistance between the test points:
    • B+ - Relay Switch & B+ - Relay Coil
    • B+ - Relay Switch & Control - Relay Coil
    • B+ - Relay Switch & Control - Component
    • B+ - Relay Coil & Control - Component
    • 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: B+ - Relay Coil & B+

    Connect a jumper wire between the test points: Control - Relay Coil & Ground

  6. Test for less than 2 ohms between the test points: B+ - Relay Switch & Control - Component
    • If 2 ohms or greater 

      Replace the component: KR75 Engine Controls Ignition Relay

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