Piston and Rings

Table 5

Troubleshooting Test Steps Values Results

1. Diagnostic Codes

Note: Certain diagnostic codes may cause poor performance.

A. Use the electronic service tool to check for active or logged diagnostic codes. Engine Derate or Diagnostic Codes Result: A diagnostic code is present.

Repair: Troubleshoot the diagnostic code. Refer to Troubleshooting, “Diagnostic Trouble Codes” .

Result: A diagnostic code is not present. Proceed to Test Step 2.

2. Parameters in the Electronic Control Module (ECM)

A. Use the electronic service tool to verify that the correct parameters are being used. Refer to Troubleshooting, “Configuration Parameters” for additional information. Parameters Result: The parameters are not correct.

Repair: Input the correct parameters. Refer to Troubleshooting, “Configuration Parameters” for additional information.

Result: The parameters are correct.

Proceed to Test Step 3.

3. Throttle Position Sensor/Throttle Switches

A. Turn the start switch to the ON position.

B. Run the engine until the speed is equal to the maximum noload speed.

C. Use the electronic service tool to make sure that the throttle is set to reach the maximum no-load speed. Electrical connections Result: The throttle response is not as expected.

Repair: If the maximum no-load speed cannot be obtained refer to Troubleshooting, “Switch Circuits - Test (Throttle Switch)” and Troubleshooting, “Mode Selection - Test” .

If the engine speed is erratic refer to Troubleshooting, “Speed Control - Test” .

Result: All responses are normal.

Proceed to Test Step 4.

4. Air Intake and Exhaust System

A. Observe the engine warning lamp. Check for an air filter restriction indicator, if equipped. Replace plugged air filters. Refer to the Operation and Maintenance Manual.

B. Check the air inlet and exhaust system for restrictions and/or leaks. Refer to Systems Operation/Testing and Adjusting, “Air Inlet and Exhaust System - Inspect” . Restrictions Result: There are restrictions in the air inlet or exhaust system.

Repair: Make the necessary repairs, Refer to Systems Operation/Testing and Adjusting, “Air Inlet and Exhaust System - Inspect” for additional information.

Result: The exhaust system is restricted with white deposits.

Repair: Refer to Troubleshooting, “Exhaust System Con-

tains DEF Deposits”

Result: There are no restrictions in the air inlet or exhaust system.

Proceed to Test Step 5.

(continued)

(Table 5, contd)

Troubleshooting Test Steps

5. Valve Lash

Note: The valve lash can affect the performance of the engine. A. Check the valve lash. Refer to Systems Operation, Testing and Adjusting, “Engine Valve Lash - Inspect” . Valve lash Result: The valve lash is not correct.

Repair: Make any necessary repairs. Refer to Systems Operation, Testing and Adjusting, “Engine Valve Lash Inspect” .

Values Results

Result: The valve lash is correct.

Proceed to Test Step 6.

7. Turbocharger

Note: The turbocharger that is installed on the engine is a nonserviceable item. If any mechanical fault exists, then the faulty turbocharger must be replaced.

A. Ensure that the mounting bolts for the turbocharger are tight.

B. Check that the oil drain for the turbocharger is not blocked or restricted.

C. Check that the compressor housing for the turbocharger is free of dirt and debris. Make sure that the housing is not damaged.

D. Check that the turbine housing for the turbocharger is free of dirt and debris. Make sure that the housing is not damaged.

E. Check that the turbine blades rotate freely in the turbocharger.

F. Ensure that the wastegate on the turbocharger is adjusted correctly. Refer to Systems Operation, Testing, and Adjusting, “Turbocharger - Inspect” . If the wastegate actuator is faulty, replace the turbocharger. Refer to Disassembly and Assembly, “Turbocharger - Remove” and Disassembly and Assembly, “Turbocharger - Install” . Turbocharger Result: There is a fault on the turbocharger.

Repair: Repair the turbocharger or replace the turbocharger. Refer to Disassembly and Assembly, “Turbocharger - Remove” and Disassembly and Assembly, “Turbocharger - Install” .

Result: The turbocharger is OK.

Proceed to Test Step 8.

(continued)