*LACK OF ENGINE POWER

For a complete wiring diagram Refer to Section 8W

Possible Causes

AIR IN FUEL SYSTEM

BOOST CONTROL VACUUM SUPPLY

CHECK FOR ECM DTCS

CHECKING ECM POWER AND GROUNDS

CHECKING FOR AIR LEAKS

CHECKING THE FUEL DELIVERY SYSTEM

SCAN TOOL TESTS

ENGINE DRIVE BELT/CHAIN

FUEL INJECTOR(S)

FUEL PRESSURE SOLENOID

FUEL PUMP

FUEL SYSTEM CONTAMINATION

FUEL SYSTEM LEAK

TURBOCHARGER

Diagnostic Test

1.CHECKING FOR ECM DTCS

WARNING: HIGH-PRESSURE FUEL LINES DELIVER DIESEL FUEL UNDER EXTREME PRESSURE FROM THE INJECTION PUMP TO THE FUEL INJECTORS. THIS MAY BE AS HIGH AS 23,200 PSI (1600 BAR). USE EXTREME CAUTION WHEN INSPECTING FOR HIGH-PRESSURE FUEL LEAKS.

WARNING: FUEL UNDER THIS AMOUNT OF PRESSURE CAN PENETRATE SKIN CAUSING PERSONAL INJURY OR DEATH. INSPECT FOR HIGH-PRESSURE FUEL LEAKS WITH A SHEET OF CARDBOARD. WEAR SAFETY GOGGLES AND ADEQUATE PROTECTIVE CLOTHING WHEN SERVICING FUEL SYSTEM.

Are there any DTCs present?

Yes

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

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2.CHECKING BOOST PRESSURE

NOTE: This test requires two people. One person to test drive the vehicle while a technician observes the scan tool readings

NOTE: The Boost Pressure reading should directionally follow (trail) the Boost Pressure Desired/Setpoint reading.

Does the Boost Pressure reading follow the Boost Pressure Desired/Setpoint reading?

Yes

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3.CHECK POWER AND GROUNDS

Were any problem found with the ECM powers and grounds?

Yes

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

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4.CHECKING FUEL PRESSURE

NOTE: This test requires two people. One person to test drive the vehicle while a technician observes the scan tool readings

NOTE: The Fuel Pressure reading should follow (trail) closely to the Fuel Pressure Desired/Setpoint reading.

Does the Fuel Pressure reading follow closely to the Fuel Pressure Desired/Setpoint reading?

Yes

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5.SCAN TOOL TESTS

Were any problems found?

Yes

Diagnose and/or repair as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

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6.FUEL SYSTEM CONTAMINATION

NOTE: Mixing any other fuels such as gasoline or kerosine can cause this symptom to occur.

Is the fuel contaminated?

Yes

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

Test Complete.

7.FUEL SYSTEM LEAK

Is there any evidence of leakage?

Yes

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

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8.CHECKING FUEL DELIVERY SYSTEM

NOTE: The following is a list of problems that can cause fuel pressure to deviate from specification: restricted fuel filter or fuel lines, failed fuel pressure solenoid, air in fuel system, failed fuel sending unit, contaminated fuel, faulty injector.

Were there any problems with the Fuel Delivery System?

Yes

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

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9.CHECKING FOR AIR IN FUEL SYSTEM

NOTE: If there is air in the fuel system, the Actual Fuel Pressure will oscillate more than 100 spi above and/or below the Fuel Pressure Setpoint.

Does Actual Fuel Pressure oscillate more than 100 psi above and/or below the Fuel Pressure Setpoint?

Yes

Refer to the Service Information to purge air from the fuel system.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

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10.FUEL PRESSURE SOLENOID

NOTE: A sticking Fuel Pressure Solenoid is indicated by Actual Fuel Pressure gradually dropping below the Fuel Pressure Setpoint then suddenly increasing (spiking) above the Fuel Pressure Setpoint.

Does Actual Fuel Pressure gradually decrease then suddenly increase (spike) above the Fuel Pressure

Yes

Replace the Fuel Pressure Solenoid in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

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11.FUEL INJECTOR(S)

NOTE: An injector that sticks open can cause this symptom. A sticking injector will cause the engine to miss fire and emit excessive black smoke from the exhaust system.

Does the engine exhibit the symptoms described in the above note?

Yes

Using the Service Information, remove and inspect the Fuel Injectors for signs of damage or debris that may cause the injector to stick. Sticking injectors may cause the combustion chamber to become black and oil soaked. Replace Injector(s) as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

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12.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).

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13.FUEL PRESSURE SOLENOID

Does the ECM display this DTC?

Yes

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Test Complete.

14.FUEL QUANTITY SOLENOID

Did this DTC set again?

Yes

Replace the Fuel Pump in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Test Complete.

15.CHECKING FOR AIR LEAKS

NOTE: Inspect all air intake and turbocharger related tubes for damage, restriction or poor connection. Any of these conditions can cause a poor performance/lack of power symptom.

Is there evidence of smoke leakage?

Yes

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

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16.BOOST CONTROL VACUUM SUPPLY

Is the boost control vacuum supply system o.k.?

Yes

Using the Service Information, replace the Turbocharger assembly.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

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