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Home >> Cadillac >> 2021 >> CT5 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls And Fuel - 3.0L (LGY) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P1005 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    NOTE:

    Some control module ground circuits may require up to 2 min after the ignition is turned Off before achieving a resistance reading of less than 5 Ω. In most cases the readings will drop below 20 Ω within 1 min indicating the control modules are going to sleep.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: @ K111 Fuel Pump Power Control Module
  3. Test for less than 10 Ω between the test points: Ground circuit terminal 14 & Ground
    • If 10 Ω or greater 
    1. Disconnect the ground connection: G307
    2. Test for less than 2 Ω between the test points: Ground circuit terminal 14 @ Control module harness & G307
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  4. Verify a test lamp turns On between the test points: B+ circuit terminal 46 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Remove - Test Lamp
    2. Test for less than 2 Ω between the test points: B+ circuit terminal 46 @ Control module harness & Output terminal @ F4RA Fuse
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Remove - Test Lamp
    2. Test for infinite resistance between the test points: B+ circuit terminal 46 @ Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K111 Fuel Pump Power Control Module
    • Go to next step: If the test lamp turns On 
  5. Ignition - On / Vehicle - In Service Mode
  6. Verify a test lamp turns On between the test points: Ignition circuit terminal 10 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 Ω between the test points: Ignition circuit terminal 10 @ Control module harness & Output terminal @ F34UA Fuse
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for infinite resistance between the test points: Ignition circuit terminal 10 @ Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K111 Fuel Pump Power Control Module
    • Go to next step: If the test lamp turns On 
  7. Replace the component: K111 Fuel Pump Power Control Module
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