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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (5 Of 5)) >> Diagnostic Information and Procedures >> Engine Cranks But Does Not Run >> Circuit/System Verification

Circuit/System Verification

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

This diagnostic assumes the following:

  1. Ignition - On/Vehicle - In Service Mode
  2. Verify the scan tool parameter: Water in Fuel = No
    • Go to next step: If the specified state 
  3. Engine - Cranking - For 10 s

    Verify there are no related DTCs set in the following system:

    • B23 Camshaft Position Sensor
    • B26 Crankshaft Position Sensor
    • B34 Engine Coolant Temperature Sensor
    • B46 Fuel Level Sensor
    • B47B Fuel Rail Pressure Sensor
    • E12 Glow Plug
    • E11A Fuel Heater/Water in Fuel Sensor
    • KR22 Fuel Heater Relay
    • KR75 Engine Controls Ignition Relay
    • Q18 Fuel Pressure Regulator
    • Q20 Intake Air Flow Valve
    • Control Module Internal Failure
    • Fuel Injector Control Module System Voltage
    • Fuel System
    • System Voltage
    • Theft Deterrent System
    • Go to next step: If a related DTC is not set 
  4. Ignition/Vehicle & All vehicle systems - Off
  5. Ignition - On/Vehicle - In Service Mode

    Verify the component turns On and Off: Security Indicator - But not flashing

    • Go to next step: If the component works as specified 
  6. Engine - Cranking - For 10 s

    Verify the scan tool parameter: Engine Speed = Greater than 0 RPM

    • Go to next step: If greater than 0 RPM 
  7. Engine - Cranking - For 10 s

    Verify the scan tool parameter: Engine Speed =

    • {Engine Coolant Temperature = Less than 0°C (32°F)}Greater than 50 RPM
    • {Engine Coolant Temperature = Greater than 60°C (140°F)}Greater than 125 RPM
    • Go to next step: If greater than the specified value 
  8. Verify the following conditions do not exist:
    • Hoses/Lines@Fuel System - Kinked/Leaking/Restricted/Visible Damage
    • Components@Fuel System - Leaking - Refer to: Fuel Leak Diagnosis 
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  9. Ignition - On/Vehicle - In Service Mode
  10. Perform the scan tool function: Fuel Pump@K20 Engine Control Module - On and Off

    Verify the component turns On and Off: G12 Fuel Pump

    • Go to next step: If the component turns On and Off 
  11. Engine - Cranking - For 10 s

    Verify the scan tool parameter: Fuel Rail Pressure Sensor@K20 Engine Control Module = Greater than 13 MPa (1, 885 PSI) - While the engine is cranking.

    • Go to next step: If greater than 13 MPa (1, 885 PSI) 
  12. Verify the following conditions do not exist:
    • Intake Air Duct - Collapsed/Restricted/Visible Damage
    • Air Cleaner Element - Dirty/Restricted
    • Fuel Feed Pipe - Kinked/ Leaking/Restricted/Visible Damage
    • Low Reference circuit@B23 Camshaft Position SensororB26 Crankshaft Position Sensor - Corrosion/Loose/Open/Poor Connection
    • Ground circuit@Engine - Corrosion/Loose/Poor Connection
    • Ground circuitorLow Reference circuit@K20 Engine Control Module - Corrosion/Loose/Poor Connection
    • Exhaust System - Restricted/ Visible Damage - Refer to: Restricted Exhaust
    • Q17 Fuel Injector - Blocked/Dirty/Restricted/ Visible Damage - Refer to: Fuel System Diagnosis 
    • Fuel - Contaminated/Dirty/Fill Level = Low/Ice/Paraffin Wax /Water/ - Refer to: Contaminants-in-Fuel Diagnosis 
    • B34 Engine Coolant Temperature Sensor - Skewed - Refer to: DTC P0117-P0119, P2184-P2186, P2B2D, P2B2E, or P2BB5
    • Engine - Mechanical Condition - Refer to: Symptoms - Engine Mechanical

      For example:

      • Compression - Low
      • Timing ChainorTiming Belt - Visible Damage /Worn
    • If a condition exists 

      Repair or replace the components as necessary.

    • Go to next step: If no condition exists 
  13. All OK.