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Home >> Cadillac >> 2018 >> CT6 Plug-In >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Electric Converters and Controllers >> Hybrid/EV Control System >> Diagnostic Information and Procedures >> DTC P150D or P150E >> Circuit/System Testing

Circuit/System Testing

  1. Vehicle ON.
  2. Verify DTC P0562 or P0563 is not set.
    • Go to next step: If none of the DTCs are set 
  3. Verify DTC P150D or P150E is not set.
    • If DTC P150D is set 
    1. Vehicle OFF, disconnect the X1 harness connector at the T6 Power Inverter Module.
    2. Verify a test lamp illuminates between the B+ circuit terminal 41 and ground.
      • If the test lamp does not illuminate and the circuit fuse is good 
      1. Remove the test lamp.
      2. Test for less than 2 Ω in the B+ circuit end to end.
        • If 2 Ω or greater, repair the open/high resistance in the circuit.
        • If less than 2 Ω, 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. Remove the test lamp.
      2. Test for infinite resistance between the B+ circuit and ground.
        • If less than infinite resistance, repair the short to ground on the circuit.
        • If infinite resistance, replace the T6 Power Inverter Module.
      • Go to next step: If the test lamp illuminates 
    3. Verify the T6 Power Inverter Module has the latest calibration in Calibration Information.
      • If the T6 Power Inverter Module does not have the latest calibration, program the T6 power inverter module.
      • If the T6 Power Inverter Module has the latest calibration, replace the T6 Power Inverter Module.
    4. Verify the DTC does not set.
      • If the DTC sets, replace the T6 Power Inverter Module.
      • Go to next step: If the DTC does not set
    5. All OK.
    • If DTC P150E is set 
    1. Vehicle OFF, disconnect the X1 harness connector at the T6 Power Inverter Module.
    2. Verify a test lamp illuminates between the B+ circuit terminal 56 and ground.
      • If the test lamp does not illuminate and the circuit fuse is good 
      1. Remove the test lamp.
      2. Test for less than 2 Ω in the B+ circuit end to end.
        • If 2 Ω or greater, repair the open/high resistance in the circuit.
        • If less than 2 Ω, 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. Remove the test lamp.
      2. Test for infinite resistance between the B+ circuit and ground.
        • If less than infinite resistance, repair the short to ground on the circuit.
        • If infinite resistance, replace the T6 Power Inverter Module.
        • Go to next step: If the test lamp illuminates 
      3. Verify the T6 Power Inverter Module has the latest calibration in Calibration Information.
        • If the T6 Power Inverter Module does not have the latest calibration, program the T6 power inverter module.
        • If the T6 Power Inverter Module has the latest calibration, replace the T6 Power Inverter Module.
      4. Verify the DTC does not set.
        • If the DTC sets, replace the T6 Power Inverter Module.
        • Go to next step: If the DTC does not set
      5. All OK.
    • Go to next step: If none of the DTCs are set 
  4. All OK.
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