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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (3 Of 5)) >> Diagnostic Information and Procedures >> DTC P1005 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: K111 Fuel Pump Driver Control Module
  3. Test for less than 10 ohms between the test points: Ground circuit terminal 22 & Ground
    • If 10 ohms or greater 
    1. Disconnect the ground connection: Ground terminal
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 22@Control module harness & The other end of the circuit@Ground terminal
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  4. Verify a test lamp turns On between the test points: B+ circuit terminal 7 & 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 ohms between the test points: B+ circuit terminal 7@Control module harness & Output terminal@Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - 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 7@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 Driver 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 17 & 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 ohms between the test points: Ignition circuit terminal 17@Control module harness & Output terminal@Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - 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 17@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 Driver Control Module
    • Go to next step: If the test lamp turns On 
  7. Replace the component: K111 Fuel Pump Driver Control Module
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