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Home >> Cadillac >> 2013 >> XTS AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 3.6L (LFX) - DTC P0351 To DTC P2635 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P2534 (Fuel Pump Control Module) >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition ON.
  2. Verify DTC P0562 is not set.
    • If the DTC is not set 
  3. Ignition OFF, disconnect the harness connector at the K27 Fuel Pump Control Module, ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 21 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K27 Fuel Pump Control Module.
    • If the test lamp illuminates 
  5. Replace the K27 Fuel Pump Control Module.
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