Solution K04247174
Thursday, August 29, 2019 9:07:57 PM CEST

** SOLUTION **
Title

Mack Chassis - Diagnostic Trouble Code ( DTC ) P0471 Illuminating The Malfunction
Indicator Lamp (MIL) - US17+OBD16, US17+OBD18 (GHG17, Common Rail Fuel
System) Chassis With Turbo Compound ONLY

Mack Models
Mack Model

AN - Anthem , CHU - Pinnacle, Axle back , CXU - Pinnacle, Axle front , PI - Pinnacle

Emission Standard
Emission Standard

US17 , US17+OBD16 , US17+OBD18

Engine family
Engine family

MP8

** SOLUTION **
Cause

US17 chassis may generate code P0471, with Guided Diagnostics (GD) determining
there is No Fault Found (NFF)

Solution

Review the Detailed Status Information for the P0471 DTC Readout. Verify
that the Confirmed DTC value is "True" prior to proceeding further.

If P0471 is logged and there are no other symptoms present to indicate a
problem:
A. Check with the customer to see if the truck has been driven through or has been
operating at high altitudes, approximately 4000 ft (1220 m) and above.
It has been determined that turbo compound chassis will set P0471 at higher
altitudes. This can occur if the vehicle is operated at high altitudes consistently, or
only passes through a section of high altitude during travel.
B. Software improvements have been made that address this DTC. There are two
documents that should be reviewed:

1. Product Improvement PI0883 Engine Control Module (ECM) and Aftertreatment
Control Module (ACM), Software Updates was released July 2018. This product
improvement should appear under the Campaigns section of the Product screen of
Premium Tech Tool (PTT) when first connecting to the vehicle. Applicability to
this campaign should be checked first.
- The Service Program document can be found on the dealer Mack Trucks
eMedia.
• Note: There will be a prompt to sign in to the Trucks Dealer Portal site if
necessary.
• Searching for PI0883 will return a link to the bulletin.
- If the PI applies to the product it is not necessary to proceed to the Field
Service Bulletin below.
2. Field Service Bulletin FSB 284-067 Engine Control Module (ECM) and
Aftertreatment Control Module (ACM), Reprogramming has been released and
should be reviewed if the Product Improvement does not apply to the vehicle.
- The FSB document can be found on Mack Trucks eMedia or under the Service
tab in Impact.
• Searching for 284-067 will return a link to the document in either
application.
3. If either of the above documents applied and there are no other issues present, the
vehicle should be released when software updates have been completed.

If P0471 is logged and there are other symptoms present (Regeneration,
Engine Performance):
A. An eService case must be started (Cases are still required for repairs performed to
GHG17 chassis at this time).
- The case must include:
• This solution number.
• A complete DTC readout from the time of the vehicle's arrival.
A screen shot of the readout is strongly preferred (click the link for
instructions on taking a screen shot).
• The symptoms described by the customer.
• The symptoms the technician has observed from test drive or regeneration.
• Any diagnostic checks or procedures performed.
Internal comments (FO)

If there are any other symptoms of issues such as regeneration failures, warm hold
functionality not working or weak engine brake along with this code:
Have the technician use the following steps to record a Sensor Parameter Monitor
with the turbo compound template loaded:
1. Wait for the engine to cool down below
2. While logging data, Key ON, Start and idle the vehicle for approximately 6 minutes.

3. Shut the truck down.
Check the following items:
- During Key ON, exhaust pressure should be approximately 0 psi
- During idle early phase exhaust pressure should be small, less than 5 psi.
- Once the Exhaust Pressure Governor (EPG) actuator is turned ON (P1FQZ 30-50%)
exhaust pressure should be approximately 30 psi.
This confirms that the Exhaust Pressure Governor and the Closed Loop Butterfly Valves
are working correctly at idle.
Please avoid any hardware changes specific to turbo-compound vehicle (turbocharger,
closed loop butterfly valves, exhaust pressure sensor etc) if above results are
good. Contact Nataraj Bhat or John Whelan if you see anything abnormal in this test.
NA_Sister solutions

K53623240

Solution visibility

Dealer distribution

Function(s)/component(s) affected
Function affected

1 1 0 EMS , Diagnostic tool , exhaust

Function Group
Function Group

254 catalytic converter; exhaust emission control equipment , 258 emissions aftertreatment , 284 control system, fuel supply

Customer effect
Main customer effect

diagnostics/methodology , fault code/display

Fault Codes And Error Codes
OBDII Diagnostic Trouble
Codes (P, U, B Format)

P0471

Conditions
Vehicle operating mode
Frequency of occurrence of
problem

when driving , when stationary
random

Administration
Author

RU4469V

Dealer ID

RU4469V

Last modified by

RU4469V

Creation date

12-07-2018 16:07

Date of last update

12-07-2018 17:07

Review date

15-08-2019 00:08

Status

Published

NA_Reviewer

UT0031H