REHS9179-00

Service Information System
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Special Instruction
SPN 731 FMI 16/18 Knock Detected for CAT CT11 and CT13 Engines{7000}
Media Number -REHS9179-00
Publication Date -2014/04/23
Date Updated -2014/04/23
i05775075
SPN 731 FMI 16/18 Knock Detected for CAT CT11 and CT13
Engines{7000}
SMCS - 7000
On Highway Truck:
CT660 (S/N: TGA1-UP; TGD1-UP; TJD1-UP; TEJ1-UP; TRK1-UP; TKL1-UP; TEM1-UP;
TEP1-UP; TGR1-UP; TGS1-UP; TJS1-UP; TGT1-UP; TGW1-UP; TSW1-UP; TEY1-UP;
TSY1-UP; TEZ1-UP; TGZ1-UP)
Introduction
The following procedure is for troubleshooting the SPN 731 FMI 16/18 knock detected diagnostic code.
Introduction
Table 1
SPN
FMI
Description
731
18
Knock detected: unexpected fueling without demand
731
16
Knock detected: cylinder acceleration above normal
What the driver will see when fault code sets:
Stop engine lamp illuminated
Audible alarm sounding due to stop engine lamp
Engine shutdown without turning the ignition key off
After a key cycle continued stop engine lamp illumination an audible alarm
SPN 731-18 Knock Detected: Unexpected Fueling without
Demand
Table 2
Condition / Description
Setting Criteria
Enable Conditions/ Values
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· Vehicle speed = 0
· Engine speed > 500 rpm <1600 rpm
and engine low idle speed set point is
stable (no rapid accelerations of RPM)
· Accelerator pedal = stable (No rapid
movements)
· Manual transmission clutch pedal =
not depressed
The monitoring of fuel
quantity needed to
maintain engine speed.
An increase in engine speed
with no increase or a drop in
fuel quantity demands.
· Engine coolant temperature is greater
than −9° C (15.8° F) and less than
120° C (248° F)
None of the following active faults can
be present:
· Engine coolant sensor faults
· Accelerator pedal position (APP)
sensor faults
· Clutch switch faults
· Transmission gear faults
· Crankshaft position (CKP) / camshaft
position (CMP) sensor faults
· Vehicle speed sensor (VSS) faults
SPN 731 FMI 16 Knock Detected: Cylinder Acceleration Above
Normal
Table 3
Condition / Description
Setting Criteria
Enable Conditions/ Values
· Vehicle speed = 0
· Engine speed > 500 rpm <1600
rpm and engine low idle speed set
point is stable (no rapid
accelerations of RPM)
· Accelerator pedal = stable (No
rapid movements)
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· Manual transmission clutch pedal
= not depressed
· Engine coolant temperature is
greater than
−9° C (15.8° F) and less than
120° C (248° F)
Monitor is enabled during the
operating modes and conditions
listed below
· Normal operation
The monitoring of crank shaft
velocity of power cylinders
using crankshaft position (CKP)
sensor
An increase in
Crankshaft Velocity
without an increase in
demanded.
· Stationary regeneration
· High-altitude operation
· Medium-altitude operation
· Sea-level operation
· Power take-off (PTO) operation
None of the following active faults
can be present:
· Engine coolant temperature( ECT)
sensor faults
· Clutch switch faults
· Vehicle speed sensor (VSS) faults
Related Fault Codes
Table 4
SPN
FMI
190
Description
Decision
0
Engine over speed most
severe level
Reference media number UENR1846 for
troubleshooting this code.
190
11
Engine over speed vehicle
event fault
Continue with SPN 731 FMI 16/18 diagnostics
190
15
Engine over speed detected
Continue with SPN 731 FMI 16/18 diagnostics
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Troubleshooting
Note: This procedure MUST be followed anytime the SPN 731 FMI 16 or SPN 731 FMI 18 is logged. If
DTC was cleared without a key cycle, it will clear the fault display. However the monitor in the ECM
can still be active allowing for reappearance of the fault, stop engine lamp, and shut down.
Table 5
Step
1
Action
Decision
Remove boost air piping and inspect piping for signs
of oil.
·Yes- Using turbocharger cartridge,
repair High-Pressure (HP)
turbocharger (Refer to REHS9168).
Are signs of oil present?
Verify repair history with truck owner, and by
searching the warranty history.
·No - Proceed to Step 2
·Yes - Go to Step 3
2
Has the truck recently been repaired for a failed
turbocharger?
·No- Go to Step 4.
Verify that all injectors were replaced at the same
time as turbocharger replacement.
·Yes - Go to Step 4
3
Were all injectors replaced at the same time as
turbocharger replacement?
·No- Replace injectors not replaced at
time of failure and retest for SPN 731
FMI 16 and SPN 731 FMI 18.
Test drive vehicle at low-idle creep.
4
5
In the event that vehicle speed does not register when
the vehicle is motion, the monitor for the 731 fault
codes will see the vehicle in a parked state. This will
cause the fault to set while the vehicle is in motion.
· For a manual transmission, select the lowest gear in
the transmission. Release the parking brake and
slowly let out on the clutch. Only allow engine idle
speed to drive the truck (600 - 650 RPM).
· For Automatic transmissions, put the gear selector
into manual mode and lock it into the lowest gear
available. Use the accelerator pedal to engage
transmission. Only allow engine idle speed to drive
the truck (600 - 650 RPM).
· Monitor the vehicle speed using Personal Computer
(PC) with engine diagnostic software.
·Yes - Go to Step 5
·No- Troubleshoot the VSS reporting
issue.
·Yes - Submit a case file referencing
the fault code logged and a possible
Vehicle build dates within 8/1/2011 and 11/1/2011 are flywheel issue. A tool will need to be
shipped out to check the timing.
subject to a possible flywheel machining issue.
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Is the vehicle build date with this range?
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·No - Submit a case file to Dealer
Solutions Network (DSN)
Clearing SPN 731 FMI 16/18 Fault Codes
Connect truck to PC with diagnostic engine software through the nine pin diagnostic port
Turn ignition key ON, engine OFF.
Clear fault codes
Turn ignition key OFF
Wait 30 seconds, allowing Engine Control Module (ECM) to time out (no engine communication
on j1939.
Turn ignition key ON, engine OFF. Verify that there are no DTCs present.
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