Engine Cranks But Does Not Run

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5551443 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 Circuit/System Description This diagnostic is an organized approach to identify a condition which causes the engine to crank but not start. This diagnostic directs the technician to the appropriate system diagnosis. Diagnostic Aids When ambient temperatures are below 0°C (32°F), the fuel tank pickup screen may be iced over from water in the fuel tank or paraffin crystals may have plugged the fuel filter. Diesel fuel can precipitate paraffin wax in low temperature conditions which could clog the filter. 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 Scan Tool Reference Control Module References Circuit/System Verification

Note

This diagnostic assumes the following: The battery is completely charged » Refer to: Symptoms - Engine Electrical There is adequate fuel in the fuel tank.

1. Ignition » On / Vehicle » In Service Mode
2. Verify the scan tool parameter: Water in Fuel = No ⇒ If not the specified state Refer to: Water-in-Fuel Draining or Contaminants-in-Fuel Diagnosis ⇓ 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 ⇒ If a related DTC is set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ 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 ⇒ If the component does not work as specified Refer to: Symptoms - Theft Deterrent or Symptoms - Immobilizer ⇓ If the component works as specified
6. Engine » Cranking — For 10 s Verify the scan tool parameter: Engine Speed = Greater than 0 RPM ⇒ If 0 RPM Refer to: DTC P0335 or P0336 ⇓ 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 ⇒ If the specified value or less Refer to: Engine Cranks Slowly ⇓ 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 ⇓ 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 ⇒ If the component does not turn On and Off Refer to: Fuel System Diagnosis ⇓ 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. ⇒ If 13 MPa (1,885 PSI) or less Refer to: Fuel System Diagnosis ⇓ 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 Sensor or B26 Crankshaft Position Sensor — Corrosion / Loose / Open / Poor Connection Ground circuit @ Engine — Corrosion / Loose / Poor Connection Ground circuit or Low 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 Chain or Timing Belt — Visible Damage / Worn ⇒ If a condition exists Repair or replace the components as necessary. ⇓ If no condition exists
13. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification