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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 135 (12 V Starting And Charging - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P305D or P305E >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition/vehicle OFF, disconnect the connector at the T19 Power Supply Transformer.
  2. Verify a test lamp illuminates between ground circuit terminal 7 and B+.
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit 2550 or the ground connection.

    • Go to next step: If the test lamp illuminates 
  3. Verify a test lamp illuminates between ground circuit terminal 12 and B+.
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit 2550 or the ground connection.

    • Go to next step: If the test lamp illuminates 
  4. Disconnect the KR27 Starter Relay.
  5. Test for less than 2 Ω between control circuit terminal 86 and control circuit terminal 5 at the T19 Power Supply Transformer.
    • If 2 Ω or greater 

      Repair the open/high resistance on circuit 625.

    • Go to next step: If less than 2 Ω 
  6. Replace the T19 Power Supply Transformer
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