Charge Air Cooling
On-Board Diagnostics
Common Rail Systems
EGR Systems
Turbo's
Exhaust After Treatment
100
These enable the use of higher cylinder fueling rates.
What is a charge air cooler or CAC system?
100
This is logged by the engine control module when electrical faults or system problems occur and provide information.
What is a Diagnostic Trouble Code, DTC?
100
What is the high pressure fuel pump?
100
The purpose for reintroducing exhaust gas through the EGR system.
What is to reduce NOx emissions?
100
This type has no boost pressure controls.
What are fixed geometry turbochargers?
100
A material that speeds up or slows down chemical reactions without actually entering the chemical reactions.
What is a catalyst?
200
Blue hoses typically indicate this.
What is the cold side?
200
This type of OBD fault is not ongoing and can be both active and historical.
What is intermittent?
200
Known as the injection discharge curve to best match engine operating conditions.
What is rate shaping?
200
How does EGR gas contribute to the increase in cylinder wear?
What is it contains abrasive soot?
200
The turbine wheel is connected directly to this by a shaft.
What is the compressor wheel?
200
DEF freezes at this temperature.
What is 12o F?
300
The CAC system improves combustion quality by cooling intake air resulting in this.
What is an increases air density?
300
The rules or standards used to communicate over the networks.
What is the network protocol?
300
This device controls the amount of pressure available in the fuel rail.
What is the fuel pressure regulator?
300
A system in which cooled EGR gas is pressurized in the exhaust manifold by a VGT. Exhaust gas pressure is driven above intake boost pressure.
What is a high-pressure cooled EGR, HP-CEGR, system?
300
The bypass valve located in the turbine housing.
What is a Wastegate?
300
A device installed in the exhaust system to filter out black carbon soot and other particulates from the exhaust stream.
What is a Diesel Particulate Filter or DPF?
400
The CAC system that uses engine coolant to remove heat from the pressurized intake air.
What is a Jacketed Water Aftercooler or JWAC?
400
The HD-OBD system can take one of two self-diagnostic approaches to identify faults. The system can either use traditional self-diagnostic strategies or this method.
What is the model-based approach?
400
Among the HPCR injector styles are electrohydraulic, hydraulically amplified and this type.
What is Piezoceramic injector?
400
Turbochargers with the capability of changing boost pressure or electronically varying boost and exhaust back pressure independent of engine speed and load; also known as variable nozzle turbochargers (VNTs) or variable vane turbochargers (VVTs) or this.
What are variable geometry turbochargers or VGT's?
400
The pressurized outlet of one turbo connected the the inlet of the second.
What is series turbocharging?
400
This device measure the exhaust pressure before and after the DPF.
What is the differential pressure sensor?
500
The CAC system that uses ambient air to remove heat from the pressurized intake air.
What is an Air-to-Air Aftercooler?
500
The ability of an ECU which allow them to evaluate the voltage and current levels to which they are connected and to determine whether data is in the correct operational range.
What are Self-Diagnostic Capabilities?
500
This test is used to measure for defective injector control valves responsible for draining high-pressure fuel to the low-pressure return.
What is an injector back leakage measurement test?
500
A device that measures the weight of air entering the engine and can detect air inlet restrictions caused by a restricted air filter or intake when pressure drops below a threshold value.
What is the mass airflow sensor or MAF?
500
This type is controlled by varying the opening size of the turbine nozzle that directs exhaust onto the turbine.
What is a Variable Geometry Turbocharger, VGT, or variable nozzle turbochargers (VNTs), or variable vane turbochargers (VVTs)?
500
The pressure produced in an exhaust system as the result of restrictions to exhaust gas flow.
What is exhaust back pressure or EBP?
600
The test that measures cooler efficiency or determines whether the cooler is possibly externally restricted.
What is the temperature differential test?
600
The category of DTCs that requires the successful execution of an emissions monitor to clear the code from memory.
What are permanent fault codes?
600
What happens to the actuator stack when current is applied to the piezoceramic wafers?
What is the stack expands?
600
When combining these two combustion conditions they produce the highest NOx emissions from diesel engines?
What are high cylinder temperatures and pressures?
600
Why is a barometric pressure sensor used on an electronically controlled non VGT turbocharged diesel engine?
What is to prevent turbocharger overspeeding?
600
The exhaust aftertreatment system that decomposes NOx molecules by using ammonia NH3.
What is selective catalytic reduction or SCR?