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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.7L (L3B) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P2635 >> Circuit/System Testing

Circuit/System Testing

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

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: A7 Fuel Tank Fuel Pump Module
  3. Test for less than 5 ohms between the test points: Low Reference circuit terminal 2 & Ground
    • If 5 ohms or greater 
    1. Disconnect the electrical connector: @ K111 Fuel Pump Power Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 2 @ Component harness & Terminal 9 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K111 Fuel Pump Power Control Module
    • Go to next step: If less than 5 ohms 
  4. Connect a test lamp between the test points: Control circuit terminal 1 & Low Reference circuit terminal 2
  5. Ignition - On / Vehicle - In Service Mode
  6. Perform the scan tool control function: Fuel Pump @ K111 Fuel Pump Power Control Module - From 0 to 70% and back to 0%.

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: K111 Fuel Pump Power Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 2 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: Control circuit terminal 1 @ Component harness & Terminal 8 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K111 Fuel Pump Power Control Module
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: K111 Fuel Pump Power Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 1 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K111 Fuel Pump Power Control Module
    • Go to next step: If the test lamp turns On and Off 
  7. Remove the component: A7 Fuel Tank Fuel Pump Module
  8. Verify the condition does not exist:
    • Bad fuel quality.
    • Insufficient amount of fuel in the tank.
    • Restricted fuel supply line.
    • Faulty electrical connections or wiring inside the removed component.
    • Contamination of the fuel pump fuel strainer.
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 

      Go to next step: Replace the component: A7 Fuel Tank Fuel Pump Module

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