Engine Cranks But Will Not Start

*ENGINE CRANKS BUT WILL NOT START

For a complete wiring diagram Consult Diagrams/Electrical





Diagnostic Test

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 in the symptom list.

Turn the ignition on.
With the scan tool, read the ECM DTCs.
Does the scan tool display any ECM DTCs?

Yes

- Refer to symptom list for problems related to ECM DTC.
- Perform the ECM Verification Test Ver. 1. Verification Tests

No

- Go To 2

2. SKREEM CODES PRESENT
With the scan tool, read the SKREEM DTCs.
Does the scan tool display any SKREEM DTCs?

Yes

- Refer to symptom list for problems related to SKREEM DTC.
- Perform the ECM Verification Test Ver. 1. Verification Tests

No

- Go To 3

3. CHECK FOR INTAKE SYSTEM RESTRICTIONS
Turn the ignition off.
Ensure vehicle has adequate fuel supply in fuel tank.
Inspect all air intake and turbocharger related hoses/tubes and connections.
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 Ver. 1. Verification Tests

No

- Go to 4

4. ECT SENSOR
Using a temperature probe, check the vehicle temperature near the ECT Sensor.
Turn the ignition on.
With the scan tool in Sensors, read the ECT Sensor temperature.
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 Ver. 1. Verification Tests

5. GLOW PLUGS

NOTE: Prior to performing this test, be sure to check the Glow Plug Relay operation. Refer to CHECKING GLOW PLUG OPERATION for the related symptom(s).

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 Ver. 1. Verification Tests

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

NOTE: Ensure 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 Ver. 1. Verification Tests

No

- Go To 7

7. FUEL CONTAMINATION
Inspect the fuel supply for contamination.
Is the fuel contaminated?

Yes

- Remove and replace fuel throughout the fuel system.
- Perform the ECM Verification Test Ver. 1. Verification Tests

No

- Go To 8

8. SUPPLY SIDE FUEL SYSTEM PRESSURE
Perform the Supply Side Fuel System Pressure Test.
Is the fuel pressure within specification?

Yes

- Go To 9

No

- Repair as necessary.
- Perform the ECM Verification Test Ver. 1. Verification Tests

9. FUEL PRESSURE SENSOR
Turn the ignition on, engine off.
With the scan tool, read the Fuel Pressure Sensor volts.
Is the Fuel Pressure Sensor voltage 0.45 and 0.60 volt?

Yes

- Go To 10

No

- Refer to the service information Wiring to check Fuel Pressure Sensor circuits. If Fuel Pressure Sensor circuitry is o.k., replace the Fuel Pressure Sensor.

10. CHECK FUEL PRESSURE AT ENGINE CRANKING
With 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 12

11. ENGINE DRIVE CHAINS
Refer to the service information to ensure 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 Ver. 1. Verification Tests

No

- Replace and program the Engine Control Module.

12. FUEL PRESSURE SOLENOID
Turn the ignition off.
Replace the Fuel Pressure Solenoid.
Turn the ignition on.
With the scan tool, erase the ECM DTC's.
Attempt to start the vehicle.
Does the vehicle start and run?

Yes

- Repair is complete.
- Perform the ECM Verification Test Ver. 1. Verification Tests

No

- Replace the Fuel Injection Pump assembly.
- Perform the ECM Verification Test Ver. 1. Verification Tests