K25036045

Solution K25036045
Tuesday, January 7, 2020 3:24:44 PM CET
** SOLUTION **
Title
Mack Chassis - Diagnostic Trouble Code ( DTC ) SPN4094, Check List - US10
Emissions
Mack Models
Mack Model
LEU , LR , MRU - TerraPro , CHU - Pinnacle, Axle back , CXU - Pinnacle, Axle front
, GU - Granite , TD - Titan
Emission Standard
Emission Standard
US10
** SOLUTION **
Cause
Limited amount of information available.
EM-USA10 4094 Check-list
Solution
Vehicle Information
What is the application of this unit?
____________________________________________
Is customer adding DEF more than usual? less than usual? No difference noted?
__________
What are the operating conditions when unit faults?
_________________________________
Engine failures that could have contaminated the system with oil, fuel or coolant?
________
What are the total engine hours? ________ total idle hours? _________
Is the customer adding excessive fluids? Oil ______ Coolant _______
Has engine power or fuel economy changed recently? _______
Engine Checks
Perform cylinder balance test with engine at normal operating temperature. Results?
_______
Any hard start/stumble complaints? ________
EGR DP Checked per SNM 11-09A.
EGR cooler inspected? _________
EGR valve open and close properly? Disconnect piping to verify _______
128 (EMS) and 233(ACM) have current Software? _______
DEF added to fuel tank can cause corrosion of fuel system. Condition of filters and
overflow? ________
Turbocharger function checks complete? _________
Remove inlet to DPF, with engine at normal operating temp, snap throttle. Any
excessive smoke? ______
Remove the inlet to SCR, With engine at normal operating temp snap throttle. Any
smoke? ________
Light smoke at DPF inlet during acceleration is OK, no smoke should exit DPF.
Any signs of soot in piping or stacks, any signs on Nox sensors? _________
Crystal build up in SCR inlet or pipes? _________
SCR - DEF Operations
DEF quality check with refractometer (results) _________
DEF Dosing Pressure: PSI _________ Percentage ________
Doser flow test: Test #2 __________ Test #3 __________
Nox sensor replaced recently? __________
Nox conversion test completed? __________
Regen Data
Does the unit complete a soot regen? ___________
What is your maximum T 1:_____ T 2:_____ and T 3: ______ temperatures?
Boost pressure? _______ PSI. Boost sensor part# ________________
Turbocharger wheel Speed? _______
Turbocharger VGT position? _______ Turbo serial# ________________
Engine Load? _______
DPF last serviced/inspected? _________ Part # DPF_________________
DOC last serviced/inspected? ________ Part # DOC _________________
AHI system to include 7th injector serviced/inspected/tested? _______
Overview
All basic diagnostics should be completed prior to opening a TSS case (NON Warranty).
The 4 hour limit still applies for Warranty purposes. Pressure/smoke test the complete
intake and exhaust systems. There is zero tolerance for leaks in these systems. Next, go
over
all the wiring harnesses Chassis and After-treatment. Load test the batteries, validate all
battery power and grounds. Next check the chassis air supply system to be sure the
COALESCING type air dryer cartridge has been serviced. Repair any leaks, electrical
and air
system issues before starting diagnostics on the After-treatment system. Complete
diagnostics and repair on any other active DTC’S that may be related.
Solution visibility
Dealer distribution
Function(s)/component(s) affected
Function affected
EGR
Function Group
Function Group
293 EGR (Exhaust Gas Recirculation)
Customer effect
Main customer effect
soot , regeneration , fault code/display
Fault Codes And Error Codes
US10 Fault Codes (SPNFMI Format)
Administration
SPN 4094
Author
A241298
Dealer ID
A241298
Last modified by
A241298
Creation date
17-12-2019 15:12
Date of last update
18-12-2019 15:12
Status
Published
UNCONTROLLED COPY. Printed document is for temporary use only and should not be retained.