Engine Cranks But Does Not Start

ENGINE CRANKS BUT WILL NOT START

For a complete wiring diagram, Refer to the Wiring Information Electrical Diagrams.






1. ECM CODES PRESENT

NOTE: The ECM must have proper power and ground connections for the following tests to be valid. Refer to Checking the ECM Power and Grounds. Checking the ECM Power and Ground Circuits.

1. Turn the ignition on.
2. Using the scan tool, read the ECM DTCs.

Does the scan tool display any ECM DTCs?

Yes

- Perform the appropriate diagnostic procedure.Testing and Inspection

No

- Go To 2

2. EIS/CGW CODES PRESENT
1. Using the scan tool, read the EIS/CGW DTCs.

Does the scan tool display any EIS/CGW DTCs?

Yes

- Perform the appropriate diagnostic procedure.Testing and Inspection

No

- Go To 3

3. CHECK FOR INTAKE SYSTEM RESTRICTIONS
1. Turn the ignition off.
2. Make sure vehicle has adequate fuel supply in fuel tank.
3. Inspect all air intake and turbocharger related hoses/tubes and connections.
4. Inspect the air filter for excessive dirt, soiling or other problems that may cause restricted air flow.

Were any problems found?

Yes

- Repair or replace as necessary.
- Perform the ECM VERIFICATION TEST. ECM Verification Test.

No

- Go To 4

4. ECT SENSOR
1. Using a temperature probe, check the vehicle temperature near the ECT Sensor.
2. Turn the ignition on.
3. With the scan tool in Sensors, read the ECT Sensor temperature.
4. Compare the temperature probe reading with the scan tool reading.

Are the two readings within 10°C of each other?

Yes

- Go To 5

No

- Repair as necessary.
- Perform the ECM VERIFICATION TEST. ECM Verification Test.

5. GLOW PLUGS

NOTE: Prior to performing this test, be sure to check the Glow Plug Relay operation. Refer to CHECKING GLOW PLUG OPERATION.Glow Plug - Operation

1. Check the Glow Plugs for proper operation.

Are the Glow Plugs operating properly?

Yes

- Go To 6

No

- Repair as necessary.
- Perform the ECM VERIFICATION TEST. ECM Verification Test.

6. FUEL SYSTEM RESTRICTION
1. Inspect the fuel system lines for restrictions, leaks or other problems.

NOTE: Go to the Service Information to make sure that the fuel system is properly primed. An unprimed system or excessive air in the supply system will cause a no-start condition.

Is there any evidence of problems?

Yes

- Repair as necessary.
- Perform the ECM VERIFICATION TEST. ECM Verification Test.

No

- Go To 7

7. FUEL CONTAMINATION
1. Inspect the fuel supply for contamination.

Is the fuel contaminated?

Yes

- Drain and replace the contaminated fuel in the system.
- Perform the ECM VERIFICATION TEST. ECM Verification Test.

No

- Go To 8

8. SUPPLY SIDE FUEL SYSTEM PRESSURE
1. Perform the Supply Side Fuel System Pressure Test.Symptom Related Diagnostic Procedures

Is the fuel pressure within specification?

Yes

- Go To 9

No

- Repair as necessary.
- Perform the ECM VERIFICATION TEST. ECM Verification Test.

9. FUEL PRESSURE SENSOR
1. Turn the ignition on, engine off.
2. Using the scan tool, read the Fuel Pressure Sensor Volts.

Is the Fuel Pressure Sensor voltage 0.45 and 0.60 of a Volt?

Yes

- Go To 10

No

- Go To the Service Information Wiring to check Fuel Pressure Sensor circuits. If Fuel Pressure Sensor circuitry is okay, replace the Fuel Pressure Sensor.

10. CHECK FUEL PRESSURE AT ENGINE CRANKING
1. Using the scan tool, read the Fuel Pressure Sensor signal while cranking the engine.

Does the Fuel Pressure Sensor signal increase to above 3500 psi (240 bar) within a few seconds after engine cranking begins?

Yes

- Go To 11

No

- Go To 13

11. CRACKED OR BROKEN FLEXPLATE
1. Use the service information to gain access to and inspect for a broken or cracked flexplate.

Were any problems found?

Yes

- Repair as necessary.
- Perform the ECM VERIFICATION TEST. ECM Verification Test.

No

- Go To 12

12. ENGINE DRIVE CHAINS
1. Go to the Service Information and make sure the Engine Drive Chains are installed correctly and the camshaft and crankshaft gears are timed correctly.

Were any problems found?

Yes

- Repair as necessary.
- Perform the ECM VERIFICATION TEST. ECM Verification Test.

No

- Replace and program the Engine Control Module.
- Perform the ECM VERIFICATION TEST. ECM Verification Test.

13. FUEL PRESSURE SOLENOID
1. Turn the ignition off.
2. Go to the Service Information and replace the Fuel Pressure Solenoid.
3. Turn the ignition on.
4. Using the scan tool, erase the ECM DTCs.
5. Attempt to start the vehicle.

Does the vehicle start and run?

Yes

- Repair is complete.
- Perform the ECM VERIFICATION TEST. ECM Verification Test.

No

- Replace the Fuel Injection Pump assembly.
- Perform the ECM VERIFICATION TEST. ECM Verification Test.