Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 3216
FMI: 18
Description: Selective Catalyst Reduction Inlet NOx Sensor – Drift Low
Troubleshooting:
DESCRIPTION:
NOx sensor plausibility check.
MONITORED PARAMETER:
Aftertreatment Inlet NOx sensor.
TYPICAL ENABLING CONDITIONS:
General Enabling Condition: Engine is not in regeneration and operating at high speed and
loads.
Specific Enabling Conditions:
1. Engine Speed (rpm) :
Min: 1350
Max: 1600
2. Torque (Nm):
Min: 1100
Max: 1500
3. Battery voltage:
Min 11.08
4. Engine Coolant Outlet Temperature:
70°C (158°F)
5. Ambient Temperature:
Min: -8°C (17.6°F)
6. Barometric Pressure (mbar):
Min: 755 mbar (11 psi)
7. Time since DPF regen (min.):
Min: 15
8. Beginning of injection (BOI) – Degrees of Crankshaft rotation:
Min: 10
9. EGR Mass (Kg/Min):
Min: 5
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Continuous when enabling conditions met.
TYPCIAL DURATION:
150 seconds (2 cycle).
DASH LAMPS:
MIL
ENGINE REACTION:
None
VERIFICATION:
Warm up engine and ensure engine is not in regen mode. Drive a fully-loaded trailer on
highway and maintain above enabling conditions for 150 seconds.
POSSIBLE CAUSES:
1. Damaged pins.
2. Bent pins.
3. Spread pins.
4. Corroded pins.
5. Unseated pins.
6. Signs of moisture in the connector.
7. Damaged wire.
8. Faulty Inlet NOx Sensor.
9. Leak in Exhaust Gas Recirculation (EGR) and exhaust system (turbine housing, exhaust
manifold, etc.).
10. Moisture inside ports of the delta P sensor.
11. Clogged or blocked delta P venturi ports.
12. Damaged connector of the intake pressure/temperature sensor.
13. Faulty intake pressure/temperature sensor.
14. Excessive build-up or blockage in the EGR cooler hot pipe, EGR crossover pipe and
delivery pipe.
15. Clean piping and replace EGR cooler.
16. Faulty SCR inlet NOx sensor.
Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 3216
FMI: 21
Description: Selective Catalyst Reduction (SCRA) Inlet NOx Sensor – Drift (Low Box)
Troubleshooting:
DESCRIPTION:
Selective catalyst reduction (SCR) inlet NOx sensor drift (Low box).
MONITORED PARAMETER:
Engine out NOx.
TYPICAL ENABLING CONDITIONS:
1. EGR mass flow greater than .08 kg/s.
2. Engine speed 1450 to 1900 rpm.
3. Engine torque 1400 to 2100 nm (1.03 to 1.55 lb. ft).
4. Battery voltage greater than 11 V.
5. Coolant temperature greater than 65°C (149°F).
6. Ambient temperature greater than -8°C (18°F).
7. Barometric pressure greater than 755 mbar.
8. Engine not in regeneration mode.
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Always enabled
TYPCIAL DURATION:
1.2 seconds
DASH LAMPS:
MIL
ENGINE REACTION:
None
VERIFICATION:
1. Warm up engine such that coolant temperature greater than 65°C (149°F).
2. Ensure engine is not in reaeration mode.
3. Ensure ambient temperature greater than -8°C (18°F).
4. Barometric pressure greater than 755 mbar.
POSSIBLE CAUSES:
1. Signs of leaks or damage in the entire air inlet, Charge Air Cooler (CAC), and EGR piping
and hose.
2. Exhaust leaks or damage in the Aftertreatment System (ATS).
3. Faulty NOx inlet sensor.
Page
Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 3217
FMI: 2
Description: Lambda Reading Rationality Check
Troubleshooting:
DESCRIPTION:
Goal of this diagnostic is to detect the engine out lambda signal lower than expected in engine
no-fueling mode.
MONITORED PARAMETER:
Inlet NOx sensor.
TYPICAL ENABLING CONDITIONS:
1. Engine at 1100 to 1800 rpm.
2. Accelerator at zero percent.
3. In DEF dosing mode.
4. Coolant temp above 65°C (149°F).
5. Ambient air temp above -18°C (0°F).
6. Ambient pressure above 752 mbar (10.9 psi).
7. Not in regen mode.
MONITOR SEQUENCE:
Inlet NOx sensor.
EXECUTION FREQUENCEY:
Continuous when enabling conditions met.
TYPCIAL DURATION:
10 seconds
DASH LAMPS:
10 seconds
ENGINE REACTION:
None
VERIFICATION:
Road test at operating temperature with engine above 1100 rpm, above 40% load, while not in
regeneration.
POSSIBLE CAUSES:
1. Aftertreatment Control Module (ACM) may need a software update.
2. Faulty SCR inlet NOx sensor.
Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 3217
FMI: 3
Description: Selective Catalyst Reduction Inlet NOx Sensor Circuit Failed High
Troubleshooting:
DESCRIPTION:
This code sets when there is a short to power on the SCR inlet NOx circuit between the sensor
and ECU.
MONITORED PARAMETER:
SCR Inlet NOx sensor.
TYPICAL ENABLING CONDITIONS:
Dewpoint enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Continuous when enabling conditions met.
TYPCIAL DURATION:
3 seconds
DASH LAMPS:
1. MIL
2. CEL
ENGINE REACTION:
None
VERIFICATION:
Parked regen
POSSIBLE CAUSES:
1. Bent pins.
2. Spread pins.
3. Corroded pins.
4. Faulty SCR Inlet NOx sensor.