FSB 221-010

Mack Trucks, Inc.
Greensboro, NC USA
Field Service Bulletin
Trucks
The Field Service Bulletin replaces bulletin FSB 221-010 dated 6.2013.
Date
Group
No.
Release
Page
9.2013
221
010
02
1(4)
Diagnostic Trouble Codes (DTCs), Low Oil
Pressure
CXU, GU, LEU, MRU
MP7 EPA2010, OBD2013
FSB 221-010, Diagnostic Trouble Codes (DTCs),
Low Oil Pressure
(September 2013)
Information
During long hard pull conditions, diagnostic trouble codes (DTC) SPN 100 FMI 1 or P052400
can log on certain MACK CXU, GU, LEU and MRU vehicles built between January 1, 2010
and current production with MP7 EPA2010 and OBD2013 engines. If either DTC occurs
during the conditions described in this bulletin, with or without an engine shut down lamp,
follow Guided Diagnostics for fault tracing.
Follow Guided Diagnostics fault tracing and verify the oil pressure readings with a manual
gauge at various engine revolutions per minute (RPM). After verifying all checks are within
specification, if the issue is still present and there are no obvious signs of oil dilution, replace
the pressure reduction valve using the procedure below.
Note: Drain all engine oil into a clean container for reuse. Do not reuse engine oil if it is not
reusable or the engine is due for normal oil change service.
Note: This bulletin does not apply to MACK Trucks Australia.
PV729-FSB221-010_M
USA61204
Mack Trucks, Inc.
Field Service Bulletin
Date
9.2013
Group
No.
Release
221
010
02
Required Parts
W2084377
W2084376
Required Parts
Item
Number
Part Number
1
21634021
Engine Piston Cooling Oil Pressure Sensor
1
2
21634021
Engine Oil Pressure (EOP) Sensor
1
3
469846
O-Ring, Internal
1
4
22188378
Pressure Reduction (Relief) Valve, Purple
1
Description
Quantity
Page
2(4)
Mack Trucks, Inc.
Field Service Bulletin
Date
9.2013
Group
No.
Release
221
010
02
Procedure
You must read and understand the precautions and guidelines in Service Information,
Function Group 20, “Engine Safety Practices” before performing this procedure. If you are
not properly trained and certified in this procedure, ask your supervisor for training before
you perform it.
DANGER
Do not attempt to repair or service this vehicle without having sufficient training, the correct
service literature and the proper tools. Failure to follow this could make the vehicle unsafe
and lead to serious personal injury or death.
1 Secure the vehicle for service by parking it on a flat level surface, applying the parking
brake, chocking the rear wheels, and placing the transmission in neutral or park.
2 Disconnect all battery cables from the negative (ground) battery terminals to prevent
personal injury from electrical shock and prevent damage to electrical components.
3 Inspect the oil pressure sensors and note the part numbers on them. If the part number is
21302639 or less, remove and replace the engine oil pressure sensor and engine piston
cooling oil pressure sensor with new sensor part number 21634021. Tighten sensors to 30
± 5 Nm (22 ± 4 ft-lbs).
W2084377
1
Engine Piston Cooling Oil Pressure
Sensor
2
Engine Oil Pressure (EOP) Sensor
4 Remove the oil pan. Refer to Function Group 21.
Page
3(4)
Mack Trucks, Inc.
Field Service Bulletin
Date
9.2013
Group
No.
Release
221
010
02
5 Remove and replace the pressure reduction (relief) valve in the oil valve body with part
number 22188378 and replace the internal O-ring with part number 469846. Tighten cover
fasteners to 10 ± 2 Nm (88 ± 17 in-lbs).
W2082023
6 Install the oil pan. Refer to Function Group 21.
7 Refill the engine oil to the proper level.
8 Reconnect all previously removed cables to the negative (ground) battery terminals.
9 Start engine, check for leaks and proper operation. Clear any DTC.
Reimbursement
This repair may be eligible for reimbursement if a product failure was experienced
within time and mileage limits of the applicable Warranty coverage. Reimbursement
is obtained via the normal claim handling process.
Claim Type (used only when uploading from the Dealer Bus. Sys.)
01
Labor Code
Primary Labor Code
2192C-36-80 —
2.9 hrs.
Causal Part
3826265
MACK Trucks North America engages in a comprehensive program of testing and evaluating
to provide the best possible product. MACK Trucks North America however, is not committed
to, or liable for updating existing vehicles.
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