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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 P17DD-P17DF >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition Off, disconnect the connector (s) at the K212 Gear Shift Control Module.
  2. Verify a test lamp illuminates between ground circuit terminal 20 and B+
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit 1450 or the ground connection.

    • Go to next step: If the test lamp illuminates 
  3. Ignition ON.
  4. Verify a test lamp illuminates between B+ circuit terminal 9 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test the B+ circuit 5140 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test the B+ circuit 5140 for a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Replace the control module.
    • Go to next step: If the test lamp illuminates 
  5. Verify voltage at B+ circuit terminal 9 is within 1 V of the C1 Battery voltage.
    • If not the specified value 

      Repair the high resistance on B+ circuit 5440.

    • Go to next step: If the specified value 
  6. Verify a test lamp illuminates between ignition circuit terminal 17 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test the ignition circuit 639 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test the ignition circuit 639 for a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Replace the K212 Gear Shift Control Module.
      • Go to next step: If the test lamp illuminates 
    3. Verify voltage at ignition circuit terminal 16 is within 1 V of the C1 Battery voltage.
      • If not the specified value 

        Repair the high resistance on ignition circuit 4320.

      • Go to next step: If the specified value 
    4. Replace the k20 Engine Control Module.
    • Go to next step: If the test lamp illuminates 
  7. Verify voltage at ignition circuit terminal 17 is within 1 V of the C1 Battery voltage.
    • If not the specified value 

      Repair the high resistance on ignition circuit 639.

    • Go to next step: If the specified value 
  8. Verify voltage at ignition circuit terminal 16 is within 1 V of the C1 Battery voltage.
    • If not the specified value 

      Repair the high resistance on ignition circuit 4320.

    • Go to next step: If the specified value 
  9. Replace the K212 Gear Shift Control Module.
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