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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 P0622 >> Circuit/System Testing

Circuit/System Testing

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  1. Verify a test lamp illuminates between the G13 Generator B+ circuit terminal A X2 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test circuit 2 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/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 circuit 2 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 G13 Generator.
    • Go to next step: If the test lamp illuminates 
  2. Ignition Off, disconnect the X1 connector at the G13 Generator, engine running.
  3. Verify the scan tool Generator F-Terminal Signal parameter is less than 5%.
    • If 5% or greater 
    1. Test circuit 23 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found
    2. Replace the K20 Engine Control Module.
    • Go to next step: If less than 5% 
  4. Install a 3 A fused jumper wire between signal circuit terminal 2 and B+, engine running.
  5. Verify the scan tool Generator F-Terminal Signal parameter is greater than 95%.
    • If 95% or less 
    1. Test circuit 23 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. Test circuit 23 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
    3. Replace the K20 Engine Control Module.
    • Go to next step: If greater than 95% 
  6. Replace the G13 Generator.
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