Category Archives: Tips & Tricks

NORMAL FUEL SYSTEM PRESSURES – THREE FILTER SYSTEM

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Normal and abnormal fuel system pressures are listed in the following tables. The pressures can vary slightly due to different chassis fuel line configurations, fuel temperatures, fuel filter condition, and fuel viscosity.

Normal Fuel System Pressures
Port Engine 600 RPM Engine 1800 RPM
LPP Inlet (in Hg) -4 to -8 -11 to -14
LPP Outlet (PSI) 72 to 80 100 to 126
HPP Inlet (PSI) 69 to 77 92 to 112
HPP Outlet (PSI) 1 to 2.5 4 to 7
Priming Port (PSI) 72 to 80 100 to 120
Fuel Compensation pressure w/ doser regulator 75 to 85 80 to 95

If the LPPI is greater than the specified range, check for inlet restrictions.

If the high pressure pump Inlet pressure is lower than the acceptable pressure, check the pressure difference across the low pressure pump outlet pressure sensor and fuel compensation pressure sensor. If engine does not have a low pressure pump outlet pressure sensor, install J-48876 and use priming port pressure.

DD15 Engine Sensor Descriptions

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Factory-installed Sensors

The sensors integrated into the factory-installed Engine Harness are listed below.

Sensor Type Description
Camshaft Position (CMP) sensor Indicates a specific cylinder in the firing order.
Crankshaft Position (CKP) sensor Senses crankshaft position and engine speed for functions such as fuel control strategy.
Diesel Particulate Filter (DPF) inlet pressure sensor Sensor measures pressure between the Diesel Oxidation Catalyst (DOC) and the Diesel Particulate Filter (DPF) in the aftertreatment assembly located in the exhaust system of the vehicle.
DPF outlet pressure sensor Sensor measures pressure on the outlet of the after-treatment device in the exhaust system of the vehicle. Located after the DPF that is within the aftertreatment device.
DPF outlet temperature sensor Temperature measured at the outlet of the after-treatment system that is installed within the exhaust system of the vehicle. Located after the DPF that is within the aftertreatment device.
Diesel Oxidation Catalyst (DOC) inlet temperature sensor Temperature measured at the inlet of the aftertreatment device in the exhaust system of the vehicle. Located before the DOC that is within the aftertreatment device.
DOC outlet temperature sensor Temperature measured between the DOC and the DPF in the aftertreatment assembly located in the exhaust system of the vehicle.
Exhaust Gas Recirculation (EGR) Delta Pressure (Delta P) sensor Senses EGR pressure for EGR control.
EGR temperature sensor Senses EGR exhaust temperature after EGR cooler. Used for EGR system diagnosis.
Engine Coolant Temperature (ECT) sensor Senses coolant temperature for functions such as engine protection, fan control and engine fueling.
Engine Oil Pressure (EOP) sensor Senses gallery oil pressure for functions such as engine protection.
Engine Oil Temperature (EOT) sensor Senses oil temperature for functions such as reducing variation in fuel injection and fan control.
Fuel compensation pressure sensor Compensates fuel line pressure.
Fuel rail pressure sensor Senses high pressure fuel in the fuel rail
Intake Manifold Pressure (IMP) sensor Senses turbocharger boost for functions such as smoke control and engine protection.
Intake Manifold Temperature (IMT) sensor Senses boost temperature.
Low pressure fuel sensor Senses pressure in the low pressure fuel circuit
Supply fuel temperature sensor Senses fuel temperature for functions such as engine fueling.
Turbocharger compressor temperature out sensor Senses turbocharger out air temperature.
Turbocharger Speed Sensor (TSS) Monitors turbocharger speed.
Water-in-Fuel (WIF) sensor Detects water in the fuel filter that alerts the owner/driver that the fuel filter needs to be dried out.

OEM-installed Sensors

All sensors must be of the proper type and continuously monitor vehicular and environmental conditions, so the MCM can react to changing situations. The OEM is responsible for installing the sensors listed in this table.

Sensor Function
Ambient Air Temperature (AAT) sensor Senses ambient air temperature specifically for the ambient air temperature override disable feature or for Optimized Idle (OI).
Engine Coolant Level (ECL) sensor Senses coolant level for engine protection.
Turbocharger compressor inlet temperature sensor Senses the temperature of the turbocharger compressor inlet.
Vehicle Speed Sensor (VSS) Senses vehicle speed for cruise control and vehicle speed limiting.

DD15 EPA10 Engine Sensor Locations

Published / by Mechanic / 3 Comments on DD15 EPA10 Engine Sensor Locations

epa10-dd15-left-side-sensors

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  1. Engine Oil Pressure Sensor
  2. Engine Oil Temperature Sensor
  3. Coolant Inlet Temperature Sensor
  4. Intake Throttle Valve
  5. Intake Manifold Pressure / CAC Temp Sensor
  6. Fuel Rail Pressure Sensor
  7. EGR Delta P Sensor
  8. LPPO Fuel Pressure Sensor
  9. Intake Manifold Temperature Sensor
  10. Camshaft Position Sensor
  11. Fuel Compensation Pressure Sensor
  12. Fuel Doser Line Pressure Sensor
  13. Electronic Dosing Valve
  14. Fuel Cutoff Valve
  15. Crankshaft Position Sensor
  16. Supply Fuel Temperature Sensor
  17. Water-In-Fuel Sensor

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epa10-dd15-right-side-sensors

  1. Oil Separator Speed Sensor
  2. EGR Actuator
  3. Coolant Outlet Speed Sensor

All 1 Box Sensor Locations

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EPA10 1 BOX

  1. Diesel Oxidation Catalyst Outlet Temperature Sensor
  2. Diesel Oxidation Catalyst Inlet Pressure Sensor Tube
  3. Diesel Oxidation Catalyst Inlet Temperature Sensor
  4. Front Heat Shield
  5. Diesel Exhaust Fluid Nozzle
  6. Exhaust Outlet
  7. Diesel Exhaust Fluid Metering Unit
  8. Exhaust Inlet
  9. Selective Catalytic Reduction (SCR Catalyst) Outlet Temperature Sensor
  10. Selective Catalytic Reduction (SCR Catalyst) Outlet NOx Sensor
  11. Selective Catalytic Reduction (SCR Catalyst) Inlet Temperature Sensor
  12. Selective Catalytic Reduction (SCR Catalyst) Inlet and Outlet NOx Sensors (microprocessor mounted)
  13. Diesel Particulate Filter Outlet Pressure Sensor Tube
  14. Selective Catalytic Reduction (SCR Catalyst) Inlet Temperature Sensor
  15. Selective Catalytic Reduction (SCR Catalyst) Inlet NOx Sensors
  16. 47-Pin Connector Harness
  17. Diesel Particulate Filter Outlet Pressure Sensor
  18. Diesel Oxidation Catalyst Inlet Pressure Sensor
  19. Sensor bridge

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epa-10-1-box-sensor-locationsGHG14 1 BOX

  1. Diesel Oxidation Catalyst Outlet Temperature Sensor
  2. Diesel Oxidation Catalyst Inlet Pressure Sensor Tube
  3. Diesel Oxidation Catalyst Inlet Temperature Sensor
  4. Front Heat Shield
  5. Diesel Exhaust Fluid Dosing Unit
  6. Exhaust Outlet
  7. Exhaust Inlet
  8. Selective Catalytic Reduction (SCR Catalyst) Outlet Temperature Sensor
  9. Selective Catalytic Reduction (SCR Catalyst) Outlet NOx Sensor
  10. Selective Catalytic Reduction (SCR Catalyst) Inlet Temperature Sensor
  11. Selective Catalytic Reduction (SCR Catalyst) Inlet and Outlet NOx Sensors (microprocessor mounted)
  12. Diesel Particulate Filter Outlet Pressure Sensor Tube
  13. Selective Catalytic Reduction (SCR Catalyst) Inlet Temperature Sensor
  14. Selective Catalytic Reduction (SCR Catalyst) Inlet NOx Sensors
  15. 47-Pin Connector Harness
  16. Diesel Particulate Filter Outlet Pressure Sensor
  17. Diesel Oxidation Catalyst Inlet Pressure Sensor
  18. Sensor bridge.   SAVE MONEY ON FUEL FREIGHTLINER CASCADIAghg14-1-box-sensor-locations

How to do a Parked Regen

Published / by Mechanic / 6 Comments on How to do a Parked Regen

    1. Keep engine at slow idle (cannot be in Fast Idle or PTO Mode). Put transmission in neutral (if equipped with an automatic transmission, cycle it into gear and then back to neutral).
NOTICE:

Air tank pressure must be high enough for the parking brake switch to hold in the OFF position.

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    1. Set park brake (cycle the park brake OFF then ON for CPC R21 or lower software).

    1. Press and release clutch pedal once per ignition cycle (if configured).

  1. Hold DPF Switch to the ON position for five seconds and then release (engine speed will increase and DPF lamp will go out). regen-buttonEPA07/10/GHG14 Exhaust – EGR – ATS Manual (DDC-SVC-MAN-0083) | 37 EPA10/GHG14 Aftertreatment System Overview | 37.9 Performing a Parked Regeneration – EPA10/GHG14When the parked regeneration request is accepted, the Diesel Particulate Filter (DPF) Regeneration lamp will turn ON one time for one second and then turn off for the remainder of the parked regeneration. The High Exhaust System Temperature (HEST) lamp will flash for one second every ten seconds and eventually become solid when the tailpipe temperature is above 525°C (977°F).The engine speed will increase to 1100 RPM for all DD Platform engines. The regeneration will take 30 to 40 minutes. The regeneration is complete when the engine returns to low idle and the DPF lamp remains OFF. The HEST lamp will remain ON, but the vehicle may be driven.

    NOTE: A parked regeneration will STOP and the engine will return to low idle if any of the following happens:

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    • The key is turned to the OFF position
    • The vehicle is put into gear
    • The clutch is cycled
    • The parking brake is released
    NOTE: If a parked regeneration is being performed to check NOx conversion, the calculated ambient temperature in the ACM (AS053) must be above 0°C (32°F) or the test will fail.
    NOTE: If the HEST LAMP is FLASHING, a regeneration is in process and the system is coming up to temperature.

How to Check Fault Codes DD15 Freightliner Cascadia

Published / by Mechanic / 2 Comments on How to Check Fault Codes DD15 Freightliner Cascadia

Follow these guidelines to check for fault codes on any Freightliner Cascaida with a DD15 engine.

  1. Key on, Engine off.
  2. Placed unit in neutral.
  3. Locate the square black button on the odometer screen.
  4. Using the black button cycle through the options displayed on the odometer reading until it reads “diagnose”.
  5. Hold the button until the display shows “faults”.
  6. From there it will show you the number of active faults in the system.
  7. Again using the black button cycle through the “faults” to observe the SPN and FMI.