02 10-16

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02 10-16

SUBJECT

DATE

SPN 1322 (MCM) (GHG17)

February 2016

Additions, Revisions, or Updates
Publication Number / Title
DDC-SVC-MAN-0191

Platform

Section Title

Change

GHG17 DD
Platform

SPN 1322/FMI 31 GHG17

This is a new section.

All information subject to change without notice.

02 10-16

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2 SPN 1322/FMI 31 - GHG17

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SPN 1322/FMI 31 - GHG17

Idle Smoothness Control/Multiple Cylinder Misfire At Idle
Table 1.
SPN 1322/FMI 31
Description

This Fault Code Sets when the Motor Control Module (MCM) Detects
That Multiple Cylinders Have Low rpm Speed with the Injector
Commanded to Max Fueling for a Count of Two with All Conditions
Met

Monitored Parameter

Engine rpm

Typical Enabling Conditions

• Engine Speed Steady between 600 and 950 rpm
• Engine Coolant Temperature between 65°C (149°F) and 114°C
(237° F)
• Engine Fuel Temperature between 0°C (32°F) and 150°C (302° F)

Monitor Sequence

None

Execution Frequency

Once Per Drive Cycle When Enabling Conditions are Met

Typical Duration

Five Seconds

Dash Lamps

CEL, MIL

Engine Reaction

25% Derate

Verification

Ensure the ignition has been off for a minimum of five minutes prior
to the last ignition on. Meet all enabling conditions. Let the Engine
Idle for five minutes. (Fault code status will become pending with one
detected failure and active with the second).

NOTE: DO NOT use the Idle Speed Balance (ISB) test in DiagnosticLink ® for ANY misfire at idle testing.
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
WARNING: PERSONAL INJURY
Diesel engine exhaust and some of its constituents are known to the State of California to cause
cancer, birth defects, and other reproductive harm.
• Always start and operate an engine in a well ventilated area.
• If operating an engine in an enclosed area, vent the exhaust to the outside.
• Do not modify or tamper with the exhaust system or emission control system.

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All information subject to change without notice.

Copyright © 2016 DETROIT DIESEL CORPORATION 02 10-16

02 10-16

WARNING: PERSONAL INJURY
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level
surface, parking brake is set, and the wheels are blocked.

CAUTION: ELECTRICAL SHOCK
To avoid injury from electrical shock, use care when connecting battery cables. The magnetic
switch studs are at battery voltage.

WARNING: BODILY INJURY
To avoid injury from a falling component, ensure an appropriately rated lifting device is used.
Moving the component without an appropriately rated lifting device could result in the component
falling, which could cause serious personal injury and component damage. Never stand beneath a
suspended load.

WARNING: PERSONAL INJURY
To avoid injury, never remove any engine component while the engine is running.

1. Does the engine exhibit knocking noise while running?
a. Yes; Go to step 2.
b. No; Go to step 4.
2. Remove the Exhaust Gas Recirculation (EGR) hot pipe and check for raw fuel. Was raw fuel found?
a. Yes; perform the following:
Refer to section "Cleaning of the DD13 Exhaust Gas Recirculation System"
Refer to section "Cleaning of the DD15 Exhaust Gas Recirculation System"
Refer to section "Cleaning of the DD16 Exhaust Gas Recirculation System"
b. No; reinstall EGR hot pipe and Go to step 3.
3. Refer to section "Aerated Fuel Test – Two-Filter Fuel System". Was the fuel system found to be aerated?
a. Yes; make necessary repairs. Verify repairs.
b. No; Refer to section "Different Engine Noise".
NOTE: Faults are listed in diagnostic priority from top to bottom.
4. Are there any of the following faults present?
• SPN 651/FMI any
• SPN 3659/FMI any
• SPN 7384/FMI any
• SPN 2797/FMI any
• SPN 4257/FMI any
• SPN 5357/FMI any
• SPN 190/FMI 0, 14, or 15
• SPN 636/FMI 2, 8, 10, or 11
• SPN 723/FMI 8, 10, or 11
• SPN 157/FMI any
• SPN 164/FMI any
• SPN 520268/FMI any
a. Yes; repair fault with the highest priority listed above.
b. No; Go to step 5.
All information subject to change without notice.

02 10-16

Copyright © 2016 DETROIT DIESEL CORPORATION

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2 SPN 1322/FMI 31 - GHG17
5. Check the maximum engine speed in DDEC Reports. You must view the Life-To-Date data instead of Trip Activity
data. Life-To-Date data can be found by selecting the "View" drop down menu, then selecting "Life-To-Date" and then
selecting "Engine." In the resulting page view, look at the Peak Engine rpm and the date it occurred. Is the maximum
engine speed greater than 3000 rpm?
a. Yes; Go to step 6.
b. No; Go to step 7.
6. View past warranty and repair history to determine if both camshafts were replaced after the engine overspeed. Were
the camshafts replaced?
a. Yes; Go to step 7.
b. No; replace both camshafts. Inspect the engine brake rocker arms for loose actuator piston retainers and loose or
missing return springs. Verify repairs.
7. Connect a battery charger to the vehicle to maintain sufficient battery voltage while cranking. Use DiagnosticLink to
perform the Relative Cylinder Compression test. Refer to section "Relative Cylinder Compression Test". Is the relative
compression reading for all cylinders within 10% of the highest cylinder reading?
a. Yes; Go to step 17.
b. No; Go to step 9.
8. Turn the engine OFF.
9. Disconnect the battery charger.
10. Remove the rocker cover. Refer to section "Removal of the Rocker Cover".
11. 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. Perform verification in fault code chart header to verify repairs.
b. No; Go to step 13.
12. Check the valve lash clearance for all cylinders. Refer to section "Setting the Valve and Engine Brake Lash". Is the
valve lash within specification?
a. Yes; Go to step 14.
b. No; adjust the valve lash to the correct clearance. Perform verification in fault code chart header to verify repairs.
13. Check the engine brake lash. Refer to section "Setting the Valve and Engine Brake Lash". Is the engine brake lash
within specification?
a. Yes; Go to step 16.
b. No; Go to step 15.
14. 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. Perform verification in fault code chart header to verify repairs.
Refer to section "Removal of the Camshafts"
Refer to section "Removal of the Exhaust Rocker Shaft Assembly"
b. No; set the correct engine brake lash. Refer to section "Setting the Valve and Engine Brake Lash". Perform
verification in fault code chart header to verify repairs.
15. Connect the battery charger to maintain proper cranking speed.
16. Perform the Mechanical Cylinder Compression test. Refer to section "Mechanical Cylinder Compression Test". Is the
mechanical cylinder compression reading for any cylinder 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; Go to step 17.
17. 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. Repair as necessary.
b. No; replace the fuel injectors. Refer to section "Removal of the Fuel Injector - Two-Filter System". Perform
verification in fault code chart header to verify repairs.

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All information subject to change without notice.

Copyright © 2016 DETROIT DIESEL CORPORATION 02 10-16