Description
1. 01 08-15
Additions, Revisions, or Updates
2. SPN 1323/FMI 31 – GHG14
Idle Smoothness Control/Cylinder #1 Misfire At Idle
Table 1.
Check as follows:
Possible causes:
• Valve Lash Out Of Adjustment
• Valve Train Damage/Failure
• Bent Valve
• Valve Face/Seat Damage
• Stuck Jake Brake
• Bearing Failure
• Bent Connecting Rod
• Cylinder Liner Damage
• Piston Ring Damage
• Failed Cylinder Head Gasket
• Failed Fuel Injector
1. Connect DiagnosticLink ®.
2. Turn the ignition ON (key ON, engine OFF).
3. Check for injector circuit fault codes. Are fault codes SPN 1323/FMI 3 or FMI 4 present?
a. Yes; diagnose the circuit fault codes first. Verify repair.
b. No; Go to step 4.
4. Check for engine over speed fault codes. Are fault codes SPN 190/FMI 0, FMI 14 or FMI 15 present?
a. Yes; diagnose the other faults first.
b. No; Go to step 5.
5. Check the max camshaft speed. Is the max camshaft speed above 3000 rpm?
a. Yes; replace the camshafts.
b. No; Go to step 6.
6. Check for cam sensor or crank sensor fault codes. Are fault codes SPN 636/FMI 2, FMI 8, FMI 10, FMI 11, SPN
723/FMI 8, FMI 10, or FMI 11 also present?
a. Yes; diagnose the other fault codes first.
b. No; Go to step 7.
7. Does the engine exhibit knocking noise while running?
a. Yes; determine the cause of the noise. Repair as necessary.
b. No; Go to step 8.
8. Connect a battery charger to the vehicle to maintain sufficient battery voltage while cranking.
9. Use DiagnosticLink to perform the relative compression test. Refer to section “Relative Cylinder Compression Test”. Is the relative compression reading for cylinder #1 lower by more than 10% as compared to the highest cylinder reading?
a. Yes; Go to step 13.
b. No; Go to step 10.
10. Disconnect the battery charger.
11. Start and run the engine until the coolant temperature is greater than 70°C (158°F) and the fuel temperature is greater than 10°C (50°F).
12. Use DiagnosticLink to check the cylinder Idle Speed Balance (ISB) readings. Refer to section “Checking Idle Speed Balance”. Does cylinder #1 pass the ISB test?
a. Yes; refer to Technical Service letter 15 TS-1 for further instructions.
b. No; Go to step 23.
13. Turn the engine OFF.
14. Remove the rocker cover. Refer to section “Removal of the Rocker Cover”.
15. Visually inspect the rocker arms, rollers on the rocker shafts and the lobes on the camshafts. Are the rocker arms, rollers or camshafts damaged?
a. Yes; replace the damaged components.
b. No; Go to step 16.
16. Check the valve lash clearance for cylinder #1. Refer to section “Valve Lash Adjustments”. Is the valve lash within specification?
a. Yes; Go to step 17.
b. No; adjust the valve lash to the correct clearance. Verify repair.
17. Check the engine brake lash. Refer to section “Setting the Engine Brake Lash”. Is the engine brake lash within
specification?
a. Yes; Go to step 18.
b. No; Go to step 19.
18.Inspect the engine brake piston actuator. Is the engine brake piston actuator constantly engaged or stuck in the extended position?
a. Yes; replace the engine brake rocker arm. Refer to section “Removal of Camshaft and Rocker Shaft/Engine
Brake Assembly”. Verify repair.
b. No; Go to step 21.
19. Turn the engine brake adjuster screw out to back off the actuator piston from the rocker arm.
20. Set the correct engine brake lash. Refer to section “Setting the Engine Brake Lash”. Does the engine brake actuator piston stick when adjusting the actuator?
a. Yes; replace the engine brake rocker arm. Refer to section “Removal of Camshaft and Rocker Shaft/Engine
Brake Assembly”.
b. No; adjust the engine brake valve lash to the correct specification. Refer to section “Setting the Engine Brake
Lash”. Verify repair.
21. Connect the battery charger to maintain proper cranking speed.
22. Perform the mechanical cylinder compression test. Refer to section “Mechanical Cylinder Compression Test”. Is the mechanical cylinder compression reading for cylinder #1 344 kPa (50 psi) lower than any of the other cylinders?
a. Yes; disconnect the battery charger and remove the cylinder head. Refer to section “Symptom Diagnostics – Low Engine Compression” to check for the cause of the loss of compression.
b. No; remove the oil pan and inspect the bearings starting with the bearings near cylinder #1. Repair as necessary.
23. Turn the engine OFF.
24. Remove and inspect the engine oil filter. Refer to section “Replacement of the Oil Filter”. Is there an excessive amount of metal present in the oil filter?
a. Yes; remove the oil pan and inspect the bearings starting with the bearings near cylinder #1. Repair as necessary.
b. No; replace the fuel injector in cylinder #1. Refer to section “Removal of the Fuel Injector – Two-Filter System”.
Verify repair.
3. SPN 1324/FMI 31 – GHG14
Idle Smoothness Control/ Cylinder #2 Misfire At Idle
Table 2.
Check as follows:
Possible causes:
• Valve Lash Out Of Adjustment
• Valve Train Damage/Failure
• Bent Valve
• Valve Face/Seat Damage
• Stuck Jake Brake
• Bearing Failure
• Bent Connecting Rod
• Cylinder Liner Damage
• Piston Ring Damage
• Failed Cylinder Head Gasket
• Failed Fuel Injector
1. Connect DiagnosticLink®.
2. Turn the ignition ON (key ON, engine OFF).
3. Check for injector circuit fault codes. Are fault codes SPN 1324/FMI 3 or FMI 4 present?
a. Yes; diagnose the circuit fault codes first. Verify repair.
b. No; Go to step 4.
4. Check for engine over speed fault codes SPN 190/FMI 0, FMI 14 or FMI 15 present.
a. Yes; diagnose the other faults first.
b. No; Go to step 5.
5. Check the max camshaft speed. Is the max camshaft speed above 3000 rpm?
a. Yes; replace the camshafts.
b. No; Go to step 6.
6. Check for cam sensor or crank sensor fault codes. Are fault codes SPN 636/FMI 2, FMI 8, FMI 10 FMI 11, SPN
723/FMI 8, FMI 10, or FMI 11 also present?
a. Yes; diagnose the other fault codes first.
b. No; Go to step 7.
7. Does the engine exhibit knocking noise while running?
a. Yes; determine the cause of the noise. Repair as necessary.
b. No; Go to step 8.
8. Connect a battery charger to the vehicle to maintain sufficient battery voltage while cranking.
9. Use DiagnosticLink to perform the relative compression test. Refer to section “Relative Cylinder Compression Test”. Is the relative compression reading for cylinder #2 lower by more than 10% as compared to the highest cylinder reading?
a. Yes; Go to step 13.
b. No; Go to step 10.
10. Disconnect the battery charger.
11. Start and run the engine until the coolant temperature is greater than 70°C (158°F) and the fuel temperature is greater than 10°C (50°F).
12. Use DiagnosticLink to check the cylinder Idle Speed Balance (ISB) readings. Refer to section “Checking Idle Speed Balance”. Does cylinder #2 pass the ISB test?
a. Yes; refer to Technical Service letter 15 TS-1 for further instructions.
b. No; Go to step 23.
13. Turn the engine OFF.
14. Remove the rocker cover. Refer to section “Removal of the Rocker Cover”.
15. Visually inspect the rocker arms, rollers on the rocker shafts and the lobes on the cam shafts. Are the rocker arms, rollers or camshafts damaged?
a. Yes; replace the damaged components.
b. No; Go to step 16.
16. Check the valve lash clearance for cylinder #2. Refer to section “Valve Lash Adjustments”. Is the valve lash within specification?
a. Yes; Go to step 17.
b. No; adjust the valve lash to the correct clearance. Verify repair.
17. Check the engine brake lash. Refer to section “Setting the Engine Brake Lash”. Is the engine brake lash within
specification?
a. Yes; Go to step 18.
b. No; Go to step 19.
18.Inspect the engine brake piston actuator. Is the engine brake piston actuator constantly engaged or stuck in the extended position?
a. Yes; replace the engine brake rocker arm. Refer to section “Removal of Camshaft and Rocker Shaft/Engine
Brake Assembly”. Verify repair.
b. No; Go to step 21.
19. Turn the engine brake adjuster screw out to back off the actuator piston from the rocker arm.
20. Set the correct engine brake lash. Refer to section “Setting the Engine Brake Lash”. Does the engine brake actuator piston stick when adjusting the actuator?
a. Yes; replace the engine brake rocker arm. Refer to section “Removal of Camshaft and Rocker Shaft/Engine
Brake Assembly”.
b. No; adjust the engine brake valve lash to the correct specification. Refer to section “Setting the Engine Brake
Lash”. Verify repair.
21. Connect the battery charger to maintain proper cranking speed.
22. Perform the mechanical cylinder compression test. Refer to section “Mechanical Cylinder Compression Test”. Is the mechanical cylinder compression reading for cylinder #2 344 kPa (50 psi) lower than any of the other cylinders?
a. Yes; disconnect the battery charger and remove the cylinder head. Refer to section “Symptom Diagnostics – Low Engine Compression” to check for the cause of the loss of compression.
b. No; remove the oil pan and inspect the bearings starting with the bearings near cylinder #2. Repair as necessary.
23. Turn the engine OFF.
24. Remove and inspect the engine oil filter. Refer to section “Replacement of the Oil Filter”. Is there an excessive amount of metal present in the oil filter?
a. Yes; remove the oil pan and inspect the bearings starting with the bearings near cylinder #2. Repair as necessary.
b. No; replace the fuel injector in cylinder #2. Refer to section “Removal of the Fuel Injector – Two-Filter System”.
Verify repair.
4. SPN 1325/FMI 31 – GHG14
Idle Smoothness Control/ Cylinder #3 Misfire At Idle
Table 3.
Check as follows:
Possible causes:
• Valve Lash Out Of Adjustment
• Valve Train Damage/Failure
• Bent Valve
• Valve Face/Seat Damage
• Stuck Jake Brake
• Bearing Failure
• Bent Connecting Rod
• Cylinder Liner Damage
• Piston Ring Damage
• Failed Cylinder Head Gasket
• Failed Fuel Injector
1. Connect DiagnosticLink ®.
2. Turn the ignition ON (key ON, engine OFF).
3. Check for injector circuit fault codes. Are fault codes SPN 1325/FMI 3 or FMI 4 present?
a. Yes; diagnose the circuit fault codes first. Verify repair.
b. No; Go to step 4.
4. Check for engine over speed fault codes SPN 190/FMI 0, FMI 14 or FMI 15 present?
a. Yes; diagnose the other faults first.
b. No; Go to step 5.
5. Check the max camshaft speed. Is the max camshaft speed above 3000 rpm?
a. Yes; replace the camshafts.
b. No; Go to step 6.
6. Check for cam sensor or crank sensor fault codes. Are fault codes, SPN 636/FMI 2, FMI 8, FMI 10 FMI 11, SPN
723/FMI 8, FMI 10, or FMI 11 also present?
a. Yes; diagnose the other fault codes first.
b. No; Go to step 7.
7. Does the engine exhibit knocking noise while running?
a. Yes; determine the cause of the noise. Repair as necessary.
b. No; Go to step 8.
8. Connect a battery charger to the vehicle to maintain sufficient battery voltage while cranking.
9. Use DiagnosticLink to perform the relative compression test. Refer to section “Relative Cylinder Compression Test”. Is the relative compression reading for cylinder #3 lower by more than 10% as compared to the highest cylinder reading?
a. Yes; Go to step 13.
b. No; Go to step 10.
10. Disconnect the battery charger.
11. Start and run the engine until the coolant temperature is greater than 70°C (158°F) and the fuel temperature is greater than 10°C (50°F).
12. Use DiagnosticLink to check the cylinder Idle Speed Balance (ISB) readings. Refer to section “Checking Idle Speed Balance”. Does cylinder #3 pass the ISB test?
a. Yes; refer to Technical Service letter 15 TS-1 for further instructions.
b. No; Go to step 23.
13. Turn the engine OFF.
14. Remove the rocker cover. Refer to section “Removal of the Rocker Cover”.
15. Visually inspect the rocker arms, rollers on the rocker shafts and the lobes on the camshafts. Are the rocker arms, rollers or camshafts damaged?
a. Yes; replace the damaged components.
b. No; Go to step 16.
16. Check the valve lash clearance for cylinder #3. Refer to section “Valve Lash Adjustments”. Is the valve lash within specification?
a. Yes; Go to step 17.
b. No; adjust the valve lash to the correct clearance. Verify repair.
17. Check the engine brake lash. Refer to section “Setting the Engine Brake Lash”. Is the engine brake lash within
specification?
a. Yes; Go to step 18.
b. No; Go to step 19.
18.Inspect the engine brake piston actuator. Is the engine brake piston actuator constantly engaged or stuck in the extended position?
a. Yes; replace the engine brake rocker arm. Refer to section “Removal of Camshaft and Rocker Shaft/Engine
Brake Assembly”. Verify repair.
b. No; Go to step 21.
19. Turn the engine brake adjuster screw out to back off the actuator piston from the rocker arm.
20. Set the correct engine brake lash. Refer to section “Setting the Engine Brake Lash”. Does the engine brake actuator piston stick when adjusting the actuator?
a. Yes; replace the engine brake rocker arm. Refer to section “Removal of Camshaft and Rocker Shaft/Engine
Brake Assembly”.
b. No; adjust the engine brake valve lash to the correct specification. Refer to section “Setting the Engine Brake
Lash”. Verify repair.
21. Connect the battery charger to maintain proper cranking speed.
22. Perform the mechanical cylinder compression test. Refer to section “Mechanical Cylinder Compression Test”. Is the mechanical cylinder compression reading for cylinder #3 344 kPa (50 psi) lower than any of the other cylinders?
a. Yes; disconnect the battery charger and remove the cylinder head. Refer to section “Symptom Diagnostics – Low Engine Compression” to check for the cause of the loss of compression.
b. No; remove the oil pan and inspect the bearings starting with the bearings near cylinder #3. Repair as necessary.
23. Turn the engine OFF.
24. Remove and inspect the engine oil filter. Refer to section “Replacement of the Oil Filter”. Is there an excessive amount of metal present in the oil filter?
a. Yes; remove the oil pan and inspect the bearings starting with the bearings near cylinder #3. Repair as necessary.
b. No; replace the fuel injector in cylinder #3. Refer to section “Removal of the Fuel Injector – Two-Filter System”.
Verify repair.
5. SPN 1326/FMI 31 – GHG14
Idle Smoothness Control/Cylinder #4 Misfire At Idle
Table 4.
Check as follows:
Possible causes:
• Valve Lash Out Of Adjustment
• Valve Train Damage/Failure
• Bent Valve
• Valve Face/Seat Damage
• Stuck Jake Brake
• Bearing Failure
• Bent Connecting Rod
• Cylinder Liner Damage
• Piston Ring Damage
• Failed Cylinder Head Gasket
• Failed Fuel Injector
1. Connect DiagnosticLink®.
2. Turn the ignition ON (key ON, engine OFF).
3. Check for injector circuit fault codes. Are fault codes SPN 1326/FMI 3 or FMI 4 present?
a. Yes; diagnose the circuit fault codes first. Verify repair.
b. No; Go to step 4.
4. Check for engine over speed fault codes SPN 190/FMI 0, FMI 14 or FMI 15 present?
a. Yes; diagnose the other faults first.
b. No; Go to step 5.
5. Check the max camshaft speed. Is the max camshaft speed above 3000 rpm?
a. Yes; replace the camshafts.
b. No; Go to step 6.
6. Check for cam sensor or crank sensor fault codes. Are fault codes, SPN 636/FMI 2, FMI 8, FMI 10 FMI 11, SPN
723/FMI 8, FMI 10, or FMI 11 also present?
a. Yes; diagnose the other fault codes first.
b. No; Go to step 7.
7. Does the engine exhibit knocking noise while running?
a. Yes; determine the cause of the noise. Repair as necessary.
b. No; Go to step 8.
8. Connect a battery charger to the vehicle to maintain sufficient battery voltage while cranking.
9. Use DiagnosticLink to perform the relative compression test. Refer to section “Relative Cylinder Compression Test”. Is the relative compression reading for cylinder #4 lower by more than 10% as compared to the highest cylinder reading?
a. Yes; Go to step 13.
b. No; Go to step 10.
10. Disconnect the battery charger.
11. Start and run the engine until the coolant temperature is greater than 70°C (158°F) and the fuel temperature is greater than 10°C (50°F).
12. Use DiagnosticLink to check the cylinder Idle Speed Balance (ISB) readings. Refer to section “Checking Idle Speed Balance”. Does cylinder #4 pass the ISB test?
a. Yes; refer to Technical Service letter 15 TS-1 for further instructions.
b. No; Go to step 23.
13. Turn the engine OFF (key ON, engine OFF).
14. Remove the rocker cover. Refer to section “Removal of the Rocker Cover”.
15. Visually inspect the rocker arms, rollers on the rocker shafts and the lobes on the camshafts. Are the rocker arms, rollers or camshafts damaged?
a. Yes; replace the damaged components.
b. No; Go to step 16.
16. Check the valve lash clearance for cylinder #4. Refer to section “Valve Lash Adjustments”. Is the valve lash within specification?
a. Yes; Go to step 17.
b. No; adjust the valve lash to the correct clearance. Verify repair.
17. Check the engine brake lash. Refer to section “Setting the Engine Brake Lash”. Is the engine brake lash within
specification?
a. Yes; Go to step 18.
b. No; Go to step 19.
18.Inspect the engine brake piston actuator. Is the engine brake piston actuator constantly engaged or stuck in the extended position?
a. Yes; replace the engine brake rocker arm. Refer to section “Removal of Camshaft and Rocker Shaft/Engine
Brake Assembly”. Verify repair.
b. No; Go to step 21.
19. Turn the engine brake adjuster screw out to back off the actuator piston from the rocker arm.
20. Set the correct engine brake lash. Refer to section “Setting the Engine Brake Lash”. Does the engine brake actuator piston stick when adjusting the actuator?
a. Yes; replace the engine brake rocker arm. Refer to section “Removal of Camshaft and Rocker Shaft/Engine
Brake Assembly”.
b. No; adjust the engine brake valve lash to the correct specification. Refer to section “Setting the Engine Brake
Lash”. Verify repair.
21. Connect the battery charger to maintain proper cranking speed.
22. Perform the mechanical cylinder compression test. Refer to section “Mechanical Cylinder Compression Test”. Is the mechanical cylinder compression reading for cylinder #4 344 kPa (50 psi) lower than any of the other cylinders?
a. Yes; disconnect the battery charger and remove the cylinder head. Refer to section “Symptom Diagnostics – Low Engine Compression” to check for the cause of the loss of compression.
b. No; remove the oil pan and inspect the bearings starting with the bearings near cylinder #4. Repair as necessary.
23. Turn the engine OFF.
24. Remove and inspect the engine oil filter. Refer to section “Replacement of the Oil Filter”. Is there an excessive amount of metal present in the oil filter?
a. Yes; remove the oil pan and inspect the bearings starting with the bearings near cylinder #4. Repair as necessary.
b. No; replace the fuel injector in cylinder #4. Refer to section “Removal of the Fuel Injector – Two-Filter System”.
Verify repair.
6. SPN 1327/FMI 31 – GHG14
Idle Smoothness Control/Cylinder #5 Misfire At Idle
Table 5.
Check as follows:
Possible causes:
• Valve Lash Out Of Adjustment
• Valve Train Damage/Failure
• Bent Valve
• Valve Face/Seat Damage
• Stuck Jake Brake
• Bearing Failure
• Bent Connecting Rod
• Cylinder Liner Damage
• Piston Ring Damage
• Failed Cylinder Head Gasket
• Failed Fuel Injector
1. Connect DiagnosticLink ®.
2. Turn the ignition ON (key ON, engine OFF).
3. Check for injector circuit fault codes. Are fault codes SPN 1327/FMI 3 or FMI 4 present?
a. Yes; diagnose the circuit fault codes first. Verify repair.
b. No; Go to step 4.
4. Check for engine over speed fault codes SPN 190/FMI 0, FMI 14 or FMI 15 present?
a. Yes; diagnose the other faults first.
b. No; Go to step 5.
5. Check the max camshaft speed. Is the max camshaft speed above 3000 rpm?
a. Yes; replace the camshafts.
b. No; Go to step 6.
6. Check for cam sensor or crank sensor fault codes. Are fault codes, SPN 636/FMI 2, FMI 8, FMI 10 FMI 11, SPN
723/FMI 8, FMI 10, or FMI 11 also present?
a. Yes; diagnose the other fault codes first.
b. No; Go to step 7.
7. Does the engine exhibit knocking noise while running?
a. Yes; determine the cause of the noise. Repair as necessary.
b. No; Go to step 8.
8. Connect a battery charger to the vehicle to maintain sufficient battery voltage while cranking.
9. Use DiagnosticLink to perform the relative compression test. Refer to section “Relative Cylinder Compression Test”. Is the relative compression reading for cylinder #5 lower by more than 10% as compared to the highest cylinder reading?
a. Yes; Go to step 13.
b. No; Go to step 10.
10. Disconnect the battery charger.
11. Start and run the engine until the coolant temperature is greater than 70°C (158°F) and the fuel temperature is greater than 10°C (50°F).
12. Use DiagnosticLink to check the cylinder Idle Speed Balance (ISB) readings. Refer to section “Checking Idle Speed Balance”. Does cylinder #5 pass the ISB test?
a. Yes; refer to Technical Service letter 15 TS-1 for further instructions.
b. No; Go to step 23.
13. Turn the engine OFF.
14. Remove the rocker cover. Refer to section “Removal of the Rocker Cover”.
15. Visually inspect the rocker arms, rollers on the rocker shafts and the lobes on the camshafts. Are the rocker arms, rollers or camshafts damaged?
a. Yes; replace the damaged components.
b. No; Go to step 16.
16. Check the valve lash clearance for cylinder #5. Refer to section “Valve Lash Adjustments”. Is the valve lash within specification?
a. Yes; Go to step 17.
b. No; adjust the valve lash to the correct clearance. Verify repair.
17. Check the engine brake lash. Refer to section “Setting the Engine Brake Lash”. Is the engine brake lash within
specification?
a. Yes; Go to step 18.
b. No; Go to step 19.
18.Inspect the engine brake piston actuator. Is the engine brake piston actuator constantly engaged or stuck in the extended position?
a. Yes; replace the engine brake rocker arm. Refer to section “Removal of Camshaft and Rocker Shaft/Engine
Brake Assembly”. Verify repair.
b. No; Go to step 21.
19. Turn the engine brake adjuster screw out to back off the actuator piston from the rocker arm.
20. Set the correct engine brake lash. Refer to section “Setting the Engine Brake Lash”. Does the engine brake actuator piston stick when adjusting the actuator?
a. Yes; replace the engine brake rocker arm. Refer to section “Removal of Camshaft and Rocker Shaft/Engine
Brake Assembly”.
b. No; adjust the engine brake valve lash to the correct specification. Refer to section “Setting the Engine Brake
Lash”. Verify repair.
21. Connect the battery charger to maintain proper cranking speed.
22. Perform the mechanical cylinder compression test. Refer to section “Mechanical Cylinder Compression Test”. Is the mechanical cylinder compression reading for cylinder #5 344 kPa (50 psi) lower than any of the other cylinders?
a. Yes; disconnect the battery charger and remove the cylinder head. Refer to section “Symptom Diagnostics – Low Engine Compression” to check for the cause of the loss of compression.
b. No; remove the oil pan and inspect the bearings starting with the bearings near cylinder #5. Repair as necessary.
23. Turn the engine OFF.
24. Remove and inspect the engine oil filter. Refer to section “Replacement of the Oil Filter”. Is there an excessive amount of metal present in the oil filter?
a. Yes; remove the oil pan and inspect the bearings starting with the bearings near cylinder #5. Repair as necessary.
b. No; replace the fuel injector in cylinder #5. Refer to section “Removal of the Fuel Injector – Two-Filter System”.
Verify repair.
7. SPN 1328/FMI 31 – GHG14
Idle Smoothness Control/Cylinder #6 Misfire At Idle
Table 6.
Check as follows:
Possible causes:
• Valve Lash Out Of Adjustment
• Valve Train Damage/Failure
• Bent Valve
• Valve Face/Seat Damage
• Stuck Jake Brake
• Bearing Failure
• Bent Connecting Rod
• Cylinder Liner Damage
• Piston Ring Damage
• Failed Cylinder Head Gasket
• Failed Fuel Injector
1. Connect DiagnosticLink ®.
2. Turn the ignition ON (key ON, engine OFF).
3. Check for injector circuit fault codes. Are fault codes SPN 1328/FMI 3 or FMI 4 present?
a. Yes; diagnose the circuit fault codes first. Verify repair.
b. No; Go to step 4.
4. Check for engine over speed fault codes SPN 190/FMI 0, FMI 14 or FMI 15 present?
a. Yes; diagnose the other faults first.
b. No; Go to step 5.
5. Check the max camshaft speed. Is the max camshaft speed above 3000 rpm?
a. Yes; replace the camshafts.
b. No; Go to step 6.
6. Check for cam sensor or crank sensor fault codes. Are fault codes, SPN 636/FMI 2, FMI 8, FMI 10 FMI 11, SPN
723/FMI 8, FMI 10, or FMI 11 also present?
a. Yes; diagnose the other fault codes first.
b. No; Go to step 7.
7. Does the engine exhibit knocking noise while running?
a. Yes; determine the cause of the noise. Repair as necessary.
b. No; Go to step 8.
8. Connect a battery charger to the vehicle to maintain sufficient battery voltage while cranking.
9. Use DiagnosticLink to perform the relative compression test. Refer to section “Relative Cylinder Compression Test”. Is the relative compression reading for cylinder #6 lower by more than 10% as compared to the highest cylinder reading?
a. Yes; Go to step 13.
b. No; Go to step 10.
10. Disconnect the battery charger.
11. Start and run the engine until the coolant temperature is greater than 70°C (158°F) and the fuel temperature is greater than 10°C (50°F).
12. Use DiagnosticLink to check the cylinder Idle Speed Balance (ISB) readings. Refer to section “Checking Idle Speed Balance”. Does cylinder #6 pass the ISB test?
a. Yes; refer to Technical Service letter 15 TS-1 for further instructions.
b. No; Go to step 23.
13. Turn the engine OFF.
14. Remove the rocker cover. Refer to section “Removal of the Rocker Cover”.
15. Visually inspect the rocker arms, rollers on the rocker shafts and the lobes on the camshafts. Are the rocker arms, rollers or camshafts damaged?
a. Yes; replace the damaged components.
b. No; Go to step 16.
16. Check the valve lash clearance for cylinder #6. Refer to section “Valve Lash Adjustments”. Is the valve lash within specification?
a. Yes; Go to step 17.
b. No; adjust the valve lash to the correct clearance. Verify repair.
17. Check the engine brake lash. Refer to section “Setting the Engine Brake Lash”. Is the engine brake lash within
specification?
a. Yes; Go to step 18.
b. No; Go to step 19.
18.Inspect the engine brake piston actuator. Is the engine brake piston actuator constantly engaged or stuck in the extended position?
a. Yes; replace the engine brake rocker arm. Refer to section “Removal of Camshaft and Rocker Shaft/Engine
Brake Assembly”. Verify repair.
b. No; Go to step 21.
19. Turn the engine brake adjuster screw out to back off the actuator piston from the rocker arm.
20. Set the correct engine brake lash. Refer to section “Setting the Engine Brake Lash”. Does the engine brake actuator piston stick when adjusting the actuator?
a. Yes; replace the engine brake rocker arm. Refer to section “Removal of Camshaft and Rocker Shaft/Engine
Brake Assembly”.
b. No; adjust the engine brake valve lash to the correct specification. Refer to section “Setting the Engine Brake
Lash”. Verify repair.
21. Connect the battery charger to maintain proper cranking speed.
22. Perform the mechanical cylinder compression test. Refer to section “Mechanical Cylinder Compression Test”. Is the mechanical cylinder compression reading for cylinder #6 344 kPa (50 psi) lower than any of the other cylinders?
a. Yes; disconnect the battery charger and remove the cylinder head. Refer to section “Symptom Diagnostics – Low Engine Compression” to check for the cause of the loss of compression.
b. No; remove the oil pan and inspect the bearings starting with the bearings near cylinder #6. Repair as necessary.
23. Turn the engine OFF.
24. Remove and inspect the engine oil filter. Refer to section “Replacement of the Oil Filter”. Is there an excessive amount of metal present in the oil filter?
a. Yes; remove the oil pan and inspect the bearings starting with the bearings near cylinder #6. Repair as necessary.
b. No; replace the fuel injector in cylinder #6. Refer to section “Removal of the Fuel Injector – Two-Filter System”.
Verify repair.
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