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Home >> Cadillac >> 2017 >> XT5 Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 3.6L (LGX) - P0449 To DTC P3436 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P12A6: Fuel Pump Driver Control Module Enable Circuit Performance >> Circuit/System Testing

Circuit/System Testing

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector:K111 Fuel Pump Driver Control Module
  3. Ignition/Vehicle - On - For greater than 10 s
  4. Verify a test lamp does not turn On between the test points:Control circuit terminal 2 & Ground
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: X1 @K20 Engine Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Control circuit terminal 2 @K111 Fuel Pump Driver Control Module(harness side) & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:K20 Engine Control Module
    • If the test lamp is always Off 
  5. Remove - Test Lamp
  6. Perform the scan tool control function:Fuel Pump Enable
  7. Verify the scan tool parameter:Fuel Pump Speed Output Circuit Low Voltage Test Status=OK
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X1 @K20 Engine Control Module
    3. Test for infinite resistance between the test points:Control circuit terminal 2 @K111 Fuel Pump Driver Control Module(harness side) & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:K20 Engine Control Module
    • If the specified state 
  8. Connect a 3 A fused jumper wire between the test points:Control circuit terminal 2 @K111 Fuel Pump Driver Control Module(harness side) & Ground
  9. Verify the scan tool parameter:Fuel Pump Speed Output Circuit Low Voltage Test Status=Malfunction
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: 2 @K20 Engine Control Module
    3. Test for less than 2 ohms between the test points:Control circuit terminal 2 @K111 Fuel Pump Driver Control Module(harness side) & Terminal 69 X1 @K20 Engine Control Module(harness side)
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K20 Engine Control Module
    • If the specified state 
  10. Replace the component:K111 Fuel Pump Driver Control Module
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