This troubleshooting applies to EPA07 DD13 engines ONLY; for EPA07 DD15, you must use the Advanced Diagnostic troubleshooting in DiagnosticLink® .
Check for multiple codes.
If any of the following codes are present, troubleshoot and repair them first:
SPN 411/FMI (any)
SPN 1636/FMI (any)
SPN 2791/FMI (any)
SPN 3563/FMI (any)
SPN 2630/FMI (any)
If there are no other codes present, Go to step 3.
Ensure Motor Control Module (MCM) software is version 13.2 ZGS003 or higher.
Visually inspect the entire Exhaust Gas Recirculation (EGR) and exhaust system (turbine housing, exhaust manifold, etc.) for evidence of external leakage (e.g. soot, coolant deposits at joints).
If external leakage is found, repair as necessary.
If no external leakage is found, Go to step 5.
Remove the delta P sensor from the mounting pad; leave the electrical harness connected.
Inspect the delta P sensor for moisture inside the ports. Shake moisture out if necessary; do not replace the sensor.
Inspect the delta P venturi ports for clogging and blockage. A layer of soot on the delta P sensor is OK.
If no blockage is found, Go to step 8.
If blockage is found, clean venturi ports. Do not replace delta P sensor.
Turn the ignition ON (key ON, engine OFF).
Using DiagnosticLink® , monitor delta P voltage (pin 109).
Is the delta P voltage between 0.55 and 0.83 volts?
Yes; Go to step 13.
No; Go to step 11.
Disconnect the delta P sensor harness connector.
Inspect the delta P sensor harness connector for loose, bent, spread or corroded pins.
If pin damage is found, repair as necessary.
If no connector damage is found, replace delta P sensor. After sensor replacement, perform delta P re-calibration service routine and release the vehicle. Refer to section “Removal of the Delta P Sensor” .
With key ON and engine OFF, compare inlet manifold pressure value with the barometric pressure value. Are the values within 1.5 psi (10.3 kPa) of each other?
Yes; Go to step 14.
No; inspect the inlet manifold pressure sensor and wiring for damage.
Inspect the inlet manifold temperature sensor and the Charge Air Cooler (CAC) outlet temperature sensor connectors for corrosion.
If no evidence of corrosion is found, Go to step 15.
If evidence of corrosion is found, replace the affected temperature sensor and pigtail. Inspect the MCM 120-pin connector for corrosion and repair as necessary.
Remove EGR cooler hot pipe, EGR crossover pipe and delivery pipe and inspect for excessive build up or blockage.
If excessive build up or blockage is found, clean piping and replace EGR cooler. Refer to section “Removal of the DD13 Exhaust Gas Recirculation Cooler Water Manifold Assembly” .
If there is no excessive build up or blockage, Go to step 16.
Inspect the EGR valve for physical damage (broken butterfly, etc.).
If the EGR valve is damaged, replace the center section of the exhaust manifold. Refer to section “Removal of the Exhaust Manifold” .
If no damage is found, obtain a log file of the fault going active
Fuel Rail Pressure desired – Fuel Rail Pressure Actual > 200 bar
Monitor Sequence
None
Execution Frequency
Continuous When Enabling Conditions Met
Typical Duration
Eight Seconds
Dash Lamps
MIL, CEL
Engine Reaction
Derate 25%
Verification
Engine Idle (One Minute)
The Motor Control Module (MCM) monitors the rail pressure and when rail pressure deviation is greater than 200 bar for eight seconds, the MCM sets the code. This fault can occur due to the conditions listed below:
External fuel leakage between the high pressure pump and fuel injectors
NOTE: It is important to obtain information from the customer on when the check engine lamp occurs and if there were any performance concerns or exhaust smoke.
Did SPN 157/FMI 16 appear after the fuel system was repaired or fuel filter maintenance was performed?
Yes; the code may be set due to air in the fuel system. Clear codes and road test to verify complaint. If code does not set, release the vehicle. If code sets, Go to step 2.
No; Go to step 2.
Turn the ignition ON (key ON, engine OFF).
NOTE: On EPA10 engines with MCM software 7.6 and later, fuel tank level at the time the fault triggered can be viewed in extended data #5, “Enhanced Environmental data” Fuel Tank Level.
Check and record fuel level in all fuel tanks. Is fuel level blow ¼ tank (25%)?
Yes; add fuel and road test vehicle. If code does not become active during road test, release the truck. If the code becomes active during the road test with over ¼ tank (or 25%) of fuel, Go to step 4.
No; view fuel tank level in extended data (EPA10) or question the driver about the fuel level when the code was set. If the level was under ¼ tank (or 25%), fuel sloshing in the tank could be the cause of aerated fuel that could cause this code. If the fuel level was over ¼ tank (or 25%) when the code was set, Go to step 4.
Check for fuel contamination, including Diesel Exhaust Fluid (DEF), water, gasoline, kerosene, coolant, etc. Is contamination found?
Yes; refer to section “Contaminated Fluids.”
No;Go to step 5.
Visually inspect for external fuel leaks on the engine and on the chassis.
If a leak is found, repair leak.
If no leaks are found, Go to step 6.
Using DiagnosticLink 8.x, check for multiple codes.
If any of the additional fault codes are active, perform the associated diagnostics first:
SPN 94 / FMI 15 Fuel Filter plugged
SPN 94 / FMI 16 Fuel Filter plugged
SPN 97 / FMI 15 Water in the fuel
SPN 157 / FMI 1 Rail Pressure too High.
SPN 164 / FMI (All) Rail pressure sensor faults
SPN 174 / FMI 0 Fuel Temperature too High
SPN 679 / FMI 7 PLV stuck open
SPN 723 / FMI (all) Cam Sensor Codes
SPN 636 / FMI (all) crank sensor codes
SPN 1077 / FMI 5, 6 or 14
If only SPN 1077/7, 157/16 or 1077/31 is present, Go to step 7.
NOTE: Do not reset this counter unless the PLV is being replaced.
Using DiagnosticLink 8.x, check the value of Pressure Limiting Valve (PLV) openings. With key ON, engine OFF select the Actions tab in the top tool bar. Select Fuel System, then Pressure Limiting Valve (PLV) Change or view (E2P_RPG_CTR_PLV_OPEN) under “Extended Data Record Number 5th” list. View and record the PLV open counts. Is the counter greater than 50?
Yes; replace the PLV. Verify repairs.
No;Go to step 8.
NOTE: Engines not equipped with a Low Pressure Pump Outlet (LPPO) sensor should utilize J-48706 Fuel Diagnostic Gauge Set to monitor LPPO.
Perform Automatic Fuel system integrity check (FSIC) routine using DiagnosticLink 8.x. With key ON, Engine OFF (KOEO) start the Automatic FSIC. The software/tool will ask to start the engine when required. Once the engine is running, the software will have the engine enter and exit several engine operating conditions. Once the engine shuts down, leave the key on for five minutes. Disconnect DDDL and open the log file. The next part of the troubleshooting will require reviewing the FSIC log file. Go to step 9.
Monitor rail pressure bleed-off time. Is bleed-off time below 35 seconds?
Yes; using DiagnosticLink, perform the HP Leak Test.
No; Go to step 10.
Is the rail pressure bleed-off time is greater than 2 minutes 30 seconds?
Yes; perform the Idle Speed Balance Test to identify faulty injector.
No; Go to step 11.
Does Kw/Nw show/stay “ON / Enabled / True” while the engine is running during the Automatic FSIC routine?
Yes; Go to step 12.
No; refer to troubleshooting for SPN 723/FMI 10.
Was the fuel temperature rise greater than 10 degrees?
Yes; Go to step 14.
No; Go to step 13.
At 600 rpm, is ASL003 Fuel Compensation Pressure within range per the fuel pressure chart?
Yes; Go to step 15.
No; Go to step 14.
Monitor AS124 LPPO sensor (if equipped) or use manual gauge J-48706. Is the pressure in range at 600 and 1800 rpm?
Yes; Go to step 15.
No; Repair cause of incorrect fuel pressure.
Monitor AS124 LPPO (if equipped) and ASL003 Fuel Compensation Pressure at all engine speeds, are pressures stable with no oscillations?
Yes; Go to step 16.
No; pressures are unstable WITH oscillations of more than 1.5 psi at a steady rpm,
Check the Idle Speed Balance (ISB) Values. Are there any cylinders above 70% or below -70%?
Yes; Follow repair procedures in “Idle speed balance (ISB) test” and verify repairs.
No; Go to step 17.
Is ASL001 Rail Pressure erratic or does it have a saw tooth pattern?
Yes; Go to step 18.
NOTE: See examples of erratic pressure showing (1) ASL001 Rail pressure and (2) AS098 Desired rail pressure.
No; Go to step 19.
Perform the aerated fuel test. Was fuel aerated?
Yes; repair cause of aerated fuel.
No; replace the Quantity Control Valve.
Perform Pressure Limiting valve flow test. Did the PLV flow test pass?
Yes; Go to step 20.
No; replace the PLV.
Inspect the Low pressure fuel system for leaks . Are leaks present?
Yes; Repair as necessary.
NOTICE:
Prime fuel system prior to going to next step.
No; Go to step 21.
Cap the rail at all six injector feed connections using J-48704 injector rail caps and crank the engine for 10 seconds. Does the ASL001 rail pressure reach AS098 desired rail pressure?
Yes; Go to step 22.
No; Replace high pressure pump. .
With the injectors still capped after cranking engine for 10 seconds, does the rail pressure bleed down under 100 bar in less than five minutes?
Yes; Replace the high pressure fuel pump.
No; Go to step 23.
Using DiagnosticLink 8.x, navigate to Service Routines and Fuel System Integrity Check test and select Manual FSIC. Test drive the truck to see if the code sets. Did the code become active?
Yes; Go to step 24.
No; replace fuel filters and release vehicle to customer.
Remove the MCM 120-Pin connector. Inspect for damage including fuel, water corrosion or bent terminals. Is any damage found?
Yes; repair as needed.
No; Go to step 25.
Install a test MCM using the extension harness and test drive the truck. Does the Code come active?
Yes; Go to step 26.
No; replace MCM and verify repair.
Inspect chassis fuel system for restrictions or debris. Refer to OEM procedures. Is there a chassis fuel system issue?
Yes; identify source of issue and repair as necessary.
Motor Control Module (MCM) pin 2 circuit is shorted to power
Internal short of the quantity control valve
Check as follows:
Turn the ignition OFF.
Disconnect the QCV harness connector.
Inspect the harness connector for signs of damage: bent, spread, broken, corroded or unseated (push out) pins and signs of moisture in the connector or wire damage near the connector.
If signs of damage are present, repair as necessary.
If no signs of damage are present. Go to step 4.
Ensure the multimeter or Digital Voltage Ohm Meter (DVOM) resistance is set to zero.
If meter can auto–zero, perform this function before making a resistance measurement.
If meter cannot auto–zero, note the resistance of the leads and subtract it from the measurement taken. Go to step 5.
Measure the resistance across pins 1 and 2 of the QCV.
If the resistance is between 1.0 ohm and 2.0 ohms, Go to step 6.
If resistance is NOT between 1.0 ohm and 2.0 ohms, replace the QCV.
Refer to section “Removal of the Quantity Control Valve – Three-Filter System”
Refer to section “Removal of the Quantity Control Valve – Two-Filter System” .
Disconnect the 120-pin MCM connector.
Inspect the harness connector for signs of damage: bent, spread, broken, corroded or unseated (push out) pins and sign of moisture in the connector or wire damage near the connector.
If signs of damage are present, repair as necessary.
If no signs of damage are present, Go to step 8.
Measure the resistance between pins 1 and 3 of the QCV harness connector.
If the resistance is greater than 10k ohms, replace the MCM. Refer to section “Removal of the Motor Control Module” .
If the resistance is less than 10k ohms, repair the short circuit between pins 1 and 2 of the QCV and pins 1 and 2 of the MCM 120-pin connector.
The fault indicates that the High Idle Regeneration (HIR) was aborted due to the Diesel Oxidation Catalyst (DOC) inlet temperature not reaching the minimum of 270°C (518°F) to initiate dosing during an HIR. The CEL and MIL lamps will remain ON until the fault is resolved or a successful regeneration is completed.
Show/Hide Checkboxes
Connect DiagnosticLink® .
Is the vehicle an EPA10 model?
Yes; Go to step 3.
No; Go to step 4.
Is the Motor Control Module (MCM) software level 7.5.0.108 with fuel map ZGS 002 (DD15/16) & ZGS 003 (DD13) or higher?
Yes; Go to step 4.
No; update device software and then Go to step 4.
Check fault codes; are SPN 3242/FMI 8 or SPN 3242/FMI 20 active or previously active?
Yes; troubleshoot these codes first.
No; Go to step 5.
Start the engine.
Monitor the Diesel Oxidation Catalyst (DOC) inlet temperature sensor, the DOC outlet temperature sensor. Continue idling for 10 minutes. Is the DOC inlet temperature drifted low?
Yes; replace the DOC inlet temperature sensor and perform an HIR.
No; Go to step 7.
Using DiagnosticLink, perform an Intake Throttle Service Routine. Is the commanded position achieved?
Yes; Go to step 8.
No; replace the Intake Throttle Valve (ITV).
Inspect the exhaust system for leaks.
If a leak is found, repair as necessary.
If no leaks are found, Go to step 9.
Pressurize the intake tract and inspect for leaks.
If a leak is found, repair as necessary.
If no leaks are found, Go to step 10.
Perform a Parked Regen. Once the ITV closes, view the Inlet Manifold Pressure (IMP) reading. Is the reading less than 23 PSIa (2.59 bar [37.7 psi])?
No; inspect the ITV. Also for DD13 engines, the wastegate is command “on” during a Parked Regen; inspect the wastegate actuator and the plumbing to and from the actuator.
Yes; Go to step 11.
View the Jake Brake® -1 (PWM 13). Is the MCM commanding Jake Brake 1 on?
Yes; Go to step 12.
No; the oil temperature may be too cold. The oil temperature needs to be above 50ºC (122°F) for the Jake Brakes to turn on.
Using DiagnosticLink during the regen, view AS087 Actual Fuel Mass. Is the fuel mass above 100 mg/st?
Yes; send in the log file to the Detroit™ Customer Support Center at CSC@daimler.com. Call 800-445-1980 for further analysis and instruction.
No; Go to step 13.
Install a test MCM using the extension harness and perform a regen. Is the fuel mass above 100 mg/st?
Yes; replace the MCM.
No; Go to step 14.
Remove the valve cover. Inspect the front top of the exhaust rocker arm shaft. It should state “TOP FRONT”. Refer to section “Checking for Poor Engine Brake Performance” .
If the rocker arm does NOT state “TOP FRONT” then remove and inspect it for correct installation and part.
If the rocker arm does state “TOP FRONT”, Go to step 15.
Using DiagnosticLink, Service Routines, Cylinder Cut-Out, cut out cylinders one, two, and three. On the Jake Brake solenoid there is a button to push called the Jake Brake Override. Push and hold the Jake Brake override button. Does the engine quit running?
Yes; replace the exhaust rocker arm shaft. The plug in the rocker arm shaft is missing (cannot be seen), causing oil to activate the rear Jake Brakes.
No; Go to step 16.
When the Jake override button is pushed down, do you see all the Jake Brake rocker arm pistons come out of the Jake Brake rocker arms for cylinders one, two, and three?
Yes; replace the solenoid and assemble the engine to perform a regen.
No; Go to step 17.
Remove the front (Bank 1) engine brake solenoid from the cam frame. This will require the removal of the front injector harness. Make sure both injector harnesses (front and rear) are unplugged. Crank the engine; is there oil coming out of the port in the cam frame housing?
Yes; replace the solenoid. Go to step 18.
No; replace the cam frame housing.
Push on the Jake Brake override button again. Do the Jake Brake pistons activate for cylinders one, two and three?
Yes; assemble the engine and try a regen.
No; remove the Jake Brake solenoid and the exhaust rocker arm shaft. Blow compressed shop air through the cam frame to the solenoid gallery, inspecting for a blockage. Remove the rockers for cylinders one, two and three. Blow compressed shop air through the rocker arm inspecting for blockage. If no blockage is found, replace the Jake Brake rockers that did not have the pistons activate.
This Code Sets When the Diesel Exhaust Fluid (DEF) Pump Speed is Higher than Normal For a Given DEF Pressure
Monitored Parameter
DEF Pump Speed, DEF Pressure
Monitor Sequence
None
Execution Frequency
Continuous When Enabling Conditions Met
Typical Duration
Continuous Until Resolved
Dash Lamps
MIL, CEL
Engine Reaction
Derate 25%
Verification
SCR ADS Self-Check
Possible causes:
Restriction in the DEF line between the DEF tank and the DEF pump
Restriction in the DEF line between the DEF pump and the DEF dosing unit
Air in the DEF line between the DEF tank and the DEF pump
Restriction in the DEF pump
Failed DEF pump
Check as follows:
NOTICE:
Customers in colder climates where winter ambient air temperatures generally stay below -11° C (12°F) need to verify that the DEF is not frozen before troubleshooting this fault code.
Connect DiagnosticLink® .
Turn the ignition ON (key ON, engine OFF).
Check for multiple codes. Are codes SPN 4334/FMI 3, 4, SPN 4375/FMI 3, 4, or SPN 3361/FMI 3, 4, 5 also present?
Yes; diagnose and repair the other fault codes first. Verify repair.
No; Go to step 4.
Turn the ignition OFF.
Inspect the DEF tank vent tube. Is there any blockage or restriction?
Yes; clear the restricted vent tube. Go to step 6.
No; Go to step 6.
Using DEF test strip A0005850202, check for diesel fuel or oil contamination of the DEF fluid. Does the test strip indicate contamination?
Yes; replace the following components and refill the system with new DEF:
DEF tank
DEF tank header
DEF supply line from the DEF tank to the DEF pump
DEF line from the DEF pump to the DEF dosing unit
DEF return line from the DEF dosing unit to the DEF tank
DEF pump
DEF dosing unit
No; Go to step 7.
Inspect the DEF line that runs from the DEF pump to the DEF dosing unit. Is the DEF line damaged, pinched, or kinked?
Yes; replace the DEF line from the DEF pump to the DEF dosing unit.
No; Go to step 8.
Inspect the DEF line that runs from the DEF tank to the DEF pump. Is the DEF line damaged, pinched, or kinked?
Yes; replace the DEF line from the DEF tank to the DEF pump.
No; Go to step 9.
Disconnect the DEF supply line at the dosing unit. Fill the graduated cylinder supplied in DEF test kit (P/N: W060589001900) with water. Place the end of the DEF line into the graduated cylinder as far as possible.
NOTE: Place the graduated cylinder in a secondary container to catch over flowing DEF fluid, making sure you still have clear sight of the end of the DEF line.
Using DiagnosticLink, perform the Selective Catalyst Reduction Airless Dosing System (SCR ADS) Self-Check routine. When the service routine is running, visually inspect the DEF line for continuous air bubbles coming from the line and DEF flow.
Were any bubbles coming from the DEF pump supply line indicating a crack in the DEF pump feed line?
Yes; replace the DEF supply line from the DEF tank to the DEF pump. Verify repair.
No; Go to step 12.
NOTICE:
The RS SUPPLY KIT contains all the necessary parts for steps 12-15.
Using the DEF/Doser Kit , replace the DEF pump module filter. Go to step 13.
Replace the DEF pump inlet screen. Go to step 14.
Replace DEF Pressure Relief Valve (PRV). Go to step 15.
Replace DEF dosing unit inlet screen. Go to step 16.
NOTE: If air pressure is greater than 827 kPa (120 psi), use a pressure regulator.
Prime pump with shop air. Using a rubber tipped air gun to seal around the DEF pump inlet fitting, apply clean regulated shop air to the DEF pump inlet fitting for three to five seconds.
Connect all DEF lines and electrical connections. Go to step 18.
Perform Selective Catalytic Reduction Airless Dosing System (SCR ADS) Self-Check Routine to prime the system. Did the SCR ADS test pass?
Perform the low temperature Aftertreatment Device (ATD) regeneration; Go to step 6.
After the low temp ATD regeneration has run for 20 minutes, monitor the DOC outlet temperature sensor reading. Is the DOC outlet temperature sensor reading within 25°C (45°F) of the other exhaust temperature sensor readings?
Yes; Go to step 7.
No; replace the DOC outlet temperature sensor. Verify repair.
Visually inspect the exhaust system for leaks. Are there exhaust leaks present?
Check for multiple codes. Is fault code SPN 3216/FMI 13 or SPN 3490/FMI (any) present along with SPN 5016/FMI 3?
Yes; repair the other fault code first.
Turn the ignition OFF.
Disconnect the Aftertreatment Control Module (ACM) 120-pin connector.
Inspect the ACM 120-pin harness connector for bent, spread or corroded pins. Is any damage found?
Yes; repair as necessary. Verify repair.
No; Go to step 5.
NOTE: Multiple fault codes will set with the ACM 120-pin connector disconnected. Disregard other fault codes at this time.
Turn the ignition ON (key ON, engine OFF) and clear fault codes. Does SPN 5016/FMI 3 become active?
Yes; replace the ACM. Refer to OEM procedures.
No; Go to step 6.
Measure the voltage between pin 19 of the 120-pin ACM connector, harness side, and battery ground. Is any voltage present?
Yes; repair the short to power between pin 19 of the 120-pin ACM connector and pin 2 of the DEF coolant valve connector. Verify repair.
No; Go to step 7.
Measure the voltage between pin 50 of the 120-pin ACM connector, harness side, and battery ground. Is any voltage present?
Yes; repair the short to power between pin 50 of the 120-pin ACM connector and pin 1 of the NOx inlet sensor connector. Verify repair.
No; Go to step 11.
Is the vehicle equipped with a purge-in-process indicator?1. Yes; Go to step 9.
Measure the voltage between pin 106 of the 120-pin ACM connector, harness side, and battery ground. Is any voltage present?
Yes; repair the short to power between pin 106 of the 120-pin ACM connector and pin 2 of the DEF Purge-in-Process indicator. Verify repair.
No; Go to step 10.
NOTE: ACM Pin 110 is not populated from the factory. The 120-pin ACM connector should be equipped with a cavity plug in the 120-pin connector cavity #110.
Inspect connector cavity#110 of the 120-pin ACM connector, harness side. Is a wire populated in cavity #110?
Yes; repair the short to power on pin 110 of the 120-pin ACM connector. Repair connector as needed. Verify repair.
No; replace the ACM. Repair the connector as needed. Verify repair.
Inspect connector cavity #106 of the 120-pin ACM connector, harness side. Is a wire populated in connector cavity #106?
Yes; repair the short to power on pin 106 of the 120-pin ACM connector. Repair connector as needed. Verify repair.
No; Go to step 12.
Inspect connector cavity#110 of the 120-pin ACM connector, harness side. Is a wire populated in cavity #110?
Yes; repair the short to power on pin 110 of the 120-pin ACM connector. Repair connector as needed. Verify repair.
Hydrocarbon Doser Fuel Line Pressure Low SPN 3480/FMI 2
Description Hydrocarbon (HC) Doser Fuel Line Pressure Low
Monitored Parameter HC Doser Fuel Line Pressure
Typical Enabling Conditions Dosing Enabled
Execution Frequency Continuous When Enabling Conditions Met
Typical Duration One Minute
Dash Lamps MIL, CEL
Engine Reaction Derate 10%
Verification Parked Regeneration
TROUBLESHOOTING:
Are there any fuel system faults present?
Yes; repair fault with the highest priority listed below. Verify repair. 3480/3, or 4 4077/3, or 4 3480/1, 4077/14
No; Go to step 4.
Start the engine.
Using DiagnosticLink, perform two back-to-back “Purge Hydrocarbon Doser” service routines to help improve the chances of identifying a leak.
Turn the ignition OFF.
Visually inspect the fuel line between the HC doser block assembly and fuel doser injector valve for any sign of external fuel leaks. Are any external leaks present?
1. Yes; replace the HC doser injector valve fuel supply line. Go to step 8.
No; replace the HC fuel doser injector valve. Refer to section “Removal of the Hydrocarbon Doser Fuel Injector Valve” . Go to step 8.
Turn the ignition ON and start the engine.
Clear fault codes.
Perform a parked regeneration to verify the repair. Did SPN 3480/FMI 2 become active during regeneration?
Yes; replace doser block. Refer to section “Removal of the Hydrocarbon Doser Fuel Injector Valve” . Verify repair.
Improper Diesel Exhaust Fluid (DEF) Quality Final Warning
Monitored Parameter
DEF Quality
Typical Enabling Conditions
DEF Refill Event Detected
Monitor Sequence
None
Execution Frequency
Continuous When Enabling Conditions Met
Typical Duration
Two hours
Dash Lamps
MIL, CEL, DEF Lamp Flash
Engine Reaction
None
Verification
Parked Regeneration
To clear the fault code, ambient air temperatures must be greater than 0°C (32°F).
Connect DiagnosticLink® .
Using refractometer from DEF Test Kit W060589001900, measure DEF percentage. Is DEF percentage between 28 and 36%?
Yes; go to step 3.
No; refer to appropriate manual for DEF tank cleaning/flushing procedure, then Go to step 12.
Turn ignition ON (key ON, engine OFF).
Compare DEF pressure to ambient air pressure (baro) and DEF air pressure. Is DEF pressure within 29.6 kPa (4.3 psi) of ambient air pressure (baro) and DEF air pressure?
Yes; go to step 5.
No; replace the DEF pressure sensor. Go to step 12.
Visually check all DEF supply and air lines for physical damage (kinks, cracks, leaks, disconnects). Is any damage found?
Yes; repair as necessary; Go to step 12.
No; go to step 6.
Perform a DEF quantity test service routine and record the amount of DEF fluid level dispensed. Is the dispensed DEF fluid level between 108 and 132 mL (3.65 and 4.46 oz)?
Yes; go to step 12.
No; go to step 7.
Remove DEF air pressure and temperature sensors.
Remove the DEF inlet delivery line and DEF air supply line from metering unit.
Remove DEF nozzle from the Aftertreatment Device (ATD) box.
Flush warm water into DEF air pressure and temperature sensor cavities in the DEF metering unit until water flows from the DEF inlet and DEF nozzle. Reinstall sensors and perform the DEF quantity test service routine. Is the dispensed DEF fluid level between 102 and 138 mL (3.45 to 4.66 oz)?
Perform a DEF quantity test service routine and record the amount of DEF fluid level dispensed. Is the dispensed DEF fluid level between 102 and 138mL (3.45 to 4.66 oz)?
Connect DiagnosticLink® . Monitor (chart) the following parameters:
ASL102 Engine Speed
AS018 Selective Catalyst Reduction (SCR) Inlet Temperature
AS019 SCR Outlet Temperature
AS035 SCR Inlet NOx Sensor
AS036 SCR Outlet NOx Sensor
AS101 NOx Conversion Efficiency
Start engine and perform a parked regeneration. Retain the log file. Does the NOx conversion efficiency rise and stay above 70% (0.70) during the regeneration?
NOTE: Disregard SPN 3361/FMI 5 which will set with valve unplugged.
Turn the ignition ON (key ON, engine OFF).
Perform a low temperature Aftertreatment Device (ATD) check using DiagnosticLink to check for a drifted temperature sensor. Are the inlet NOx sensor and outlet NOx sensor readings within 50 Parts Per Million (PPM) of each other?
Start the engine and perform a complete parked regeneration. The regen will burn off any DEF deposits in the aftertreatment. Verify repairs.
Perform a low temperature Aftertreatment Device (ATD) check using DiagnosticLink to check for a drifted temperature sensor. Are the inlet NOx sensor and outlet NOx sensor readings within 50 Parts Per Million (PPM) of each other?
Yes, clear faults and release vehicle.
No, replace the SCR outlet NOx sensor. Verify repairs.
