Diagnostic / Troubleshooting Procedures For Exhaust Gas Recirculation (EGR) System Components; Covers Most EGR System Diagnostic Trouble Codes (DTC) - Mack

NHTSA ID Number: 10161908

Manufacturer Communication Number: K52535491

Summary

Diagnostic / Troubleshooting Procedures For Exhaust Gas Recirculation (EGR) System Components; Covers Most EGR System Diagnostic Trouble Codes (DTC), See List In Solution - US10, US10+OBD13, US14+OBD*, US17+OBD* With A Variable Geometry Turbocharger (VGT)

 

18 Affected Products

Vehicles

MAKE MODEL YEAR
MACK ANTHEM (AN) 2017-2020
MACK CHU 9999
MACK CXU 9999
MACK GU 9999
MACK LE 9999
MACK LR 9999
MACK MR 9999
MACK PINNACLE (PI) 2018-2020
MACK R 9999
MACK TD 9999
MACK TERRAPRO (TE) 2018-2020

Solution K52535491

Monday, June 3, 2019 6:00:47 PM CEST

** SOLUTION **

Title Diagnostic / Troubleshooting Procedures For Exhaust Gas Recirculation (EGR) System Components; Covers Most EGR System Diagnostic Trouble Codes (DTC), See List In Solution  - US10, US10+OBD13, US14+OBD*, US17+OBD* With A Variable Geometry Turbocharger (VGT)
Mack Models
Mack Model LEU, LR, MRU - TerraPro, TE - TerraPro, AN - Anthem, CHU - Pinnacle, Axle back, CXU - Pinnacle, Axle front, GR - Granite, GU - Granite, PI - Pinnacle, TD - Titan
Volvo Models
Volvo Model VNL, VNM, VNR, VNX, VAH, VHD, VT
Emission Standard
Emission Standard US10, US10+OBD13, US14+OBD13, US14+OBD15, US14+OBD16, US17+OBD16, US17+OBD18, US17+OBD19
Engine family
Engine family 11L Engine, 13L Engine, MP7, MP8
** SOLUTION **
Cause Current Guided Diagnostic steps in Premium Tech Tool ( PTT ) begin with electrical wiring and connector checks for the EGR valve, then move to a Turbocharger Actuator (VGT, SRA) function test. Field testing has indicated that insufficient flow codes are not typically caused by electrical issues or EGR valve failure, and these initial electricalrelated checks and inspections can be time-consuming.  The new Diagnostic Steps start with an enhanced review of an EGR Function test during modified test conditions that will reveal more information in less time. The new procedure has the dual purpose of not only checking EGR valve function, but also determining EGR cooler condition.
Solution An eService case is NO LONGER REQUIRED for this solution. Repairs should be performed based on the findings from the diagnostic steps below.

If a vehicle has any of the fault codes listed in the fault code section and no obvious issues are found from a visual inspection, follow the procedure below:

I.  Initial Conditions

Begin by starting Operation 2939-08-03-01 Exhaust Gas Recirculation Function under the Test tab in PTT.

  • Coolant temp must remain below 155 °F (68 °C) during this test. The EGR valve is commanded closed by the Engine Control Module during this time.
  • Engine speed should be set to 780-840 RPM using the Cruise Control switch. 800 RPMs is ideal.
    • Note that it may be necessary to set engine speed using the accelerator and the SET button initially. From there the SET and RESUME buttons should work to adjust speed.
    • Certain chassis may need to have Maximum Stationary Engine Speed set to 900 before the cruise control buttons will work to adjust idle.
  • VGT position should range between 6% and 14% depending on the coolant temperature.
    • It is important that the turbocharger position be in the above range. If the exhaust temperature is very low, the VGT will open to 40% until the DPF outlet temperature sensor (T3) reaches 140 °F (60 °C). If the turbo position is greater than 14%, the truck should be allowed to run until position returns to between 6% and 14% before performing the checks below.

II. Checks

Both steps below should have a screenshot taken showing the parameter list as shown in the pictures for each step.

  1. With initial conditions achieved, turbo speed should be checked when the EGR Position is 0%.

 Screenshot : Should be taken with Conditions (in  YELLOW ) achieved and showing EGR valve at 0%.

  • Turbocharger Speed (in LIGHT BLUE ) should be greater than 35,000 RPM If Turbo Speed is less than 30,000 RPM, a sticking EGR valve is possible.
  • If Turbo Speed is less than 20,000 RPM, a stuck EGR valve is highly likely
    • EGR differential pressure will likely show a value of at least .2 PSI (1.4 kPa).
    • The chassis may also generate excessive Parked Regeneration requests or driveability complaints.
  1. Activate the EGR valve by pressing the Play button in the EGR Valve Activation box. The valve should open to 95%.

 Screenshot : Should be taken with Conditions (in  YELLOW ) achieved and showing EGR valve at 95% just before the valve closes again OR the engine dies.

  • Turbocharger speed should drop below 15,000 RPM within 10 seconds of valve activation.
  • If turbo speed does not change, the EGR valve should be checked to confirm it is not stuck closed.
  • If turbo speed drops but remains above 20,000 RPM, the EGR cooler is likely plugged.
    • A turbo speed reaction to EGR valve activation is a normal indicator of an operational EGR valve.
    • The Venturi tube should also be checked to ensure it is free of blockage (Much less likely).
  • If turbo speed reacts as expected, the EGR differential pressure sensor or EGR Temperature Sensor are the likely issue for High or Low Flow codes.
    • Check for clogs or excessive condensation in the EGR sensor, sensor supply tubes, or Venturi tube.
    • Check for a non-plausible differential pressure value during valve activation.
      • negative value or low value, for instance .2 PSI (1.4 kPa) or less, at full valve activation is an indication of an EGR dP sensor and/or venturi tube issue.
    • Check for a non-plausible EGR temperature value during valve activation.
      • temperature reading below coolant temperature or higher than exhaust temperature is an indication of an EGR temperature sensor issue.
Solution visibility Dealer distribution
Function(s)/component(s) affected
Function affected Diagnostic tool, Turbocharger, EGR
Function Group
Function Group 293 EGR (Exhaust Gas Recirculation)
Customer effect
Main customer effect diagnostics/methodology, fault code/display
Fault Codes And Error Codes
US10 Fault Codes (SPN-FMI Format) SPN 412 FMI 15, SPN 412 FMI 0, SPN 2659 FMI 18, SPN 2659 FMI 16, SPN 4752 FMI 7
OBDII Diagnostic Trouble Codes (P, U, B Format) P0401-00, P0402-00, P04DD-00, P1121-00, P1121-98, P2457-00
Conditions
Vehicle operating mode when driving, when stationary
Frequency of occurrence of problem random
Administration
Author UT9246H
Dealer ID UT9246H
Last modified by RU4469V
Creation date 13-02-2018 15:02
Date of last update 07-05-2019 20:05
Review date 15-04-2018 00:04
Status Published
Average score 1.5
Number of scores 2

Solution K52535491
Monday, June 3, 2019 6:00:47 PM CEST

https://www.nhtsa.gov/recalls?nhtsaId=10161908

https://static.nhtsa.gov/odi/tsbs/2019/MC-10161908-9999.pdf

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