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Tahoe / Yukon Service Manual

DTC P1005

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5495424 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC P1005 Fuel Pump Power Control Module Too Many Resets Conditions for Running the DTC DTC P1000, U18A2 = Not set Ignition and Start Switch Signal = On Ignition and Start Signal = Greater than 11 V Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC Control module K111 reset = Greater than a predefined threshold — For greater than 20 s Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type A DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type A DTC Reference Information Schematic Reference Engine Controls Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Control Module References Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Verify DTC P1005 is not set. ⇒ If the DTC sets Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If the DTC does not set
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC sets Refer to: Circuit/System Testing ⇓ If the DTC does not set
  4. All OK. Circuit/System Testing
  5. Ignition/Vehicle & All vehicle systems » Off
  6. Disconnect the electrical connector: @ K111 Fuel Pump Power Control Module
  7. Test for less than 10 Ω between the test points: Each ground circuit terminal & Ground ⇒ If 10 Ω or greater 3.1. Disconnect the ground connection: Ground terminal 3.2. Test for less than 2 Ω between the test points: Ground circuit terminal @ Control module harness & The other end of the circuit ⇒ 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. ⇓ If less than 10 Ω
  8. Verify a test lamp turns On between the test points: Each B+ circuit terminal & Ground ⇒ If the test lamp does not turn On and the circuit fuse is OK 4.1. Remove » Test Lamp 4.2. Test for less than 2 Ω between the test points: B+ circuit terminal @ Control module harness & Output terminal @ 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 4.1. Remove » Test Lamp 4.2. Test for infinite resistance between the test points: B+ circuit terminal @ 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 ⇓ If the test lamp turns On
  9. Ignition » On / Vehicle » In Service Mode
  10. Verify a test lamp turns On between the test points: Each ignition circuit terminal & Ground ⇒ If the test lamp does not turn On and the circuit fuse is OK 6.1. Ignition/Vehicle » Off & Remove » Test lamp 6.2. Test for less than 2 Ω between the test points: Ignition circuit terminal @ Control module harness & Output terminal @ 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 6.1. Ignition/Vehicle » Off & Remove » Test lamp 6.2. Test for infinite resistance between the test points: Ignition circuit terminal @ 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 ⇓ If the test lamp turns On
  11. Replace the component: K111 Fuel Pump Power Control Module Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification For control module replacement, programming, and setup refer to: Control Module References