*ENGINE CRANKS BUT WILL NOT START

For a complete wiring diagram Refer to Section 8W

Possible Causes

CAMSHAFT POSITION SENSOR SIGNAL PROBLEM

CRANKSHAFT POSITION SENSOR SIGNAL PROBLEM

ECM CODES PRESENT

ECT SENSOR

ENGINE CONTROL MODULE

ENGINE DRIVE BELT/CHAIN

FUEL PRESSURE - CRANKING

FUEL SUPPLY CONTAMINATION

FUEL SYSTEM RESTRICTION

GLOW PLUGS

SKIM CODES PRESENT

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.

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 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

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2.SKIM CODES PRESENT

Does the scan tool display any SKIM DTCs?

Yes

Refer to symptom list for problems related to SKIM DTC.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

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3.ECT SENSOR

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

Yes

Go To4

Repair as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

4.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).

Are the Glow Plugs operating properly?

Yes

Go To5

Repair as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

5.FUEL SYSTEM RESTRICTION

NOTE: Refer to the Service Information to 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 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

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6.CAMSHAFT POSITION SENSOR SIGNAL PROBLEM

Does the scan tool display a steady CMP Sensor RPM approximately one half the speed of Engine RPM?

Yes

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Using the Service Information, check the wiring and connectors related to the CMP Sensor. If o.k., replace the CMP Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

7.CRANKSHAFT POSITION SENSOR SIGNAL PROBLEM

Does the scan tool display a steady CKP Sensor RPM approximately double the speed of the CMP RPM?

Yes

Go To8

Using the Service Information, check the wiring and connectors related to the CKP Sensor. If o.k., replace the CKP Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

8.FUEL PRESSURE - CRANKING

NOTE: Fuel pressure should increase above 3400 psi (240 bar) after only a few seconds of cranking.

Does the fuel pressure increase above 3500 psi (240 bar) after a few seconds of cranking?

Yes

Go To9

refer to Symptom CHECKING THE HIGH-SIDE PRESSURE.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

9.FUEL CONTAMINATION

Is the fuel contaminated?

Yes

Refer to the Service Information to remove and replace fuel throughout the fuel system.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

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10.ENGINE DRIVE BELT/CHAIN

Were any problems found?

Yes

Repair as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).