KC-687

6/1/22, 12:43 PM
Article
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Back Office - 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
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Internal Content
SOLUTION:
This solution should be used as a firstround diagnosis of EGR components. If
inspection based on test results below
does not reveal an issue, Guided
Diagnostics should be followed.
The eService requirement for this
solution was removed previously:
DO NOT open eService cases for this
solution. Cases opened for tests
performed below WILL BE REFUSED.
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
UI
; Live
Begin by starting Operation 2939-08-03-01 Exhaust Gas Recirculation
Function under the Test tab in PTT
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Function under the Test tab in PTT.
Article
- 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%.
Should be taken with Conditions (in YELLOW ) achieved and showing EGR valve at 0%.
; Live UI
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- 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.
2. Activate the EGR valve by pressing the Play button in the EGR
;
Live
UI Activation box. The valve should open to 95%.
Valve
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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.
○ A negative value or low value, for instance .2 PSI (1.4 kPa) or less, at full valve
;
Live UI 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.
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○ A temperature reading below coolant temperature or higher than exhaust
temperature is an indication of an EGR temperature sensor issue.
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Tags
k52535491
p0401-00
p04dd-00
p1121-00
spn 412 fmi 15
p0402-00
p1121-98
spn 412 fmi 0
spn 2659 fmi 16
p04d9-00
spn 4752 fmi 7
p040200
p04d900
p04dd00
p112198
p245700
mack
p2457-00
spn 2659 fmi 18
p040100
p112100
volvo
; Live UI
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