Mack calls their electronic engine control system:
Cummins calls their electronic engine control system:
Detroit Diesel calls their electronic engine controls:
The early Caterpillar electronic engine control system was called:
Technician A says that a HEUI (hydraulic electronic unit injector) does not require adjustment. Technician B says that an EUI (electronic unit injector) does not require adjustment. Who is correct?
With electronically controlled engines it is possible to program _____________.
The throttle position sensor assembly on most electronically controlled engines contains:
Electronic diesel engines are all programmed to shut down immediately in the event of low oil pressure or high coolant temperature levels.
Modern ECM''s electronic circultry tend to operate at temperatures that would cause them to over-heat if not adequately maintained at a safe temperature. Manufacturers use _________________ to help cool them.
Electronic controlled diesel engine ECM operates on a reference voltage of 12 volts, plus or minus 5 volts.
Active faults, refer to faults or conditions that have previously happened.
Technician A says that the ECM is designed and programmed to record and retain certain codes and engine history, but all records are erasable by the customer. Technician B says that if you disconnect the power from the ECM, the PROM will have to be reprogrammed. Who is correct?
Inactive fault codes are faults stored in memory but are not currently happening.
Technician A says that the ECM uses feedback from some engine actuators to control the engine operation. Technician B says that the actuators are controlled by the ECM. Who is correct?
Technician A says that some engines require two individual sensors to indicate engine speed and position. Technician B says that some engines use one sensor to indicate engine speed and position. Who is right?
SAE (society of automotive engineers) mandates that all diesel engines shall use electronic controlled diesel fuel injection system.
How do you the electronic unit injector (EUI) control fuel timing.
What is the primary objective when the progressive shift option is enabled for heavy trucks?
Electronic diesel engine fault codes may indicate:'
Technician A says that in some systems, the ECM may also engage the air conditioning compressor to increase the retarding effort when the engine brake is used. Technician B says that in some systems, the ECM may also engage the fan to increase the retarding effort when the engine brake is used. Who is right?
Technician A says that to check some injection systems, you can hold down each injector plunger to find the miss or weak firing injector. Technician B says to isolate a faulty electronic unit injector, perform a cylinder balance test, then switch injector positions and retest, to confirm a faulty injector. Who is correct?
In order to read or calibrate an electronic diesel engine using a laptop computer, requires the use of a specific engine adapter or translator and a version of the engine manufacturers software.
Technician A says that to effectively and safely find electronic engine problems, you should use a high resistance digital multimeter. Technician B says to be able to diagnose electronic engine faults you must have a good understanding of high pressure hydraulic injection systems. Who is right?
Technician A says that on the Cummins N14 the injectors are mechanically actuated and have individual solenoids to control fuel metering and timing.
Technician A says that it is sometimes acceptable to repair electronic engine wiring with solder and shrink tube connections. Technician B says that using a digital volt meter will cause damage to the ECM. Who is correct?
When voltage tests are made on electronic circuit components, the circuit should be:
At any one particular speed, the output signal of a Hall Effect sensor that would be received by an ECM would be read as a _________________ signal.
Which of the following are inserted into ECM and the wiring terminal sockets to enable testing by digital multimeter probes and minimize potential damage?
Which of the following statements is the most correct?
Which of the following aconyms does not relate to computers and not belong in this list?
Computer memory is considered to be volatile or non-volatile memory. Which of the following would be considered volatile?
A computer system monitor battery charge voltages at all times to ensure:
Input sensors generally monitor engine systems for correct operation. Which is not?
Thermistors, pulse generators and potentiometers are all different types of:
A HEUI fuel injection system involves an engine oil hydraulic system and a diesel fuel hydraulic system.
Mechanically actuated injections systems cannot be controlled electronically.
An HEUI fuel injection system uses multiple hydraulic actuation pressures within its system.
The injection actuation pressure control valve, also called the rail pressure control valve, alters the hydraulic pressure in a HEUI system by varying the opening of a drain port.
Certain instructions programmed into a PROM, establishing certain minimum and maximum parameters of a fuel injection system, cannot be changed beyond design parameters or possible engine damage and warranty disqualification will result.
If engine idle speed is changed on the parameters of an EPROM memory chip, the ECM will automatically recognize the new settings.
The modern ECM and its memory systems can store all kinds of information, except:
The HUEI fuel injector is refilled with diesel fuel during the end of injection stage.
On an electronic engine, which sensor notifies the ECM when a cylinder is in the firing location?
When trouble shooting new electronic systems with their individual diagnostic trouble codes and related information with your scanner or laptop, changes to settings cannot be performed without the:
An engine problem that is slightly outside the parameters of the ECM will energize the stop engine light.
Engine computer systems will monitor sensor inputs for pressures, temperatures and levels because these could result in a catastrophic engine failure.
Wiring harness and connectors are often the cause of system failures and trouble codes.
When accessing information and reading fault codes from an ECM, you must have the engine running and up to normal operating temperature.
Customer programmable parameters are those that can be changed at a dealership in order to customize features the ECM can control, as a convenience for the customer.
In some cases, customer programmable features (PROM) can exceed the parameters established by the engine manufacturer.
In most computerized fuel systems, what is the voltage in the sensing circuits?
Once a fault code has been retrieved from the ECM , the component identified should be exchanged for a new one.
HEUI fuel injector operation involves distinct injection stages. They are:
If 1000 lbs. of actuation oil pressure was applied to a HEUI injector, what would be the potential injection pressure?
In HPCR fuel system, fuel delivery pressure to the injectors is controlled by:
In HPCR fuel injection system, the injector needle valve is opened when
If the wire attached to the engine crank or cam position sensor or sensors were to come off, the engine would:
Transient voltages, which may affect engine RPM at idle, can be overruled by the use of a:
Which type of sensor would be potentiometer?
Which sensor reduces the chance of turbo damage due to overspeeding at high altitudes?
An inactive fault code will still flash out a code on the check engine light and the stop engine light.
Technician A says that the PCM and the electronic unit injector controls the metering of fuel into the cylinder. Technician B says that the PCM and the electronics unit injector controls the timing of the fuel injected into the cylinder. Who is correct?
With an electronically controlled engine there are usually three wiring harnesses connected to the ECM. These harnesses are 1/ the OEM (original equipment manufacturer), 2/ the actuator harness, and 3/ the:
Fault codes can be retrieved by the use of a diagnostic data reader.
An engine temperature thermistor sensor is checked using:
A thermistor is tested by measuring:
The prime responsibility of an electronic control module is to:
Engine protection is incorporated into the computerized systems because it can sense.
An important consideration when working around computerized systems is to:
The computer controls the fuel injection process by gathering information from the sensors.
The random access memory is used for:
The memory that cannot be changed or written to is the:
Computer controlled injection system are more accurate than mechanically, hydraulically or pneumatically controlled systems.
The hydraulic actuation oil pressure in the HEUI system is controlled by the ECM and the:
The amount of fuel injected by an electronic unit injector is typically controlled by pulse width modulation. Pulse width can be identified with:
Electronic unit injectors are actuated by:
An ECM cooling plate is used to:
In the EUI system, the ECM ___________ to initiate the injection process.
Technician A says the powertrain control module (PCM) contains emission-related information codes. Technician B says you must have a scan tool and software to clear any emission codes. Who is right?
What is the meaning of the abbreviation "DTC" as it pertains to the error codes on the modern diesel engine?
Please select 2 correct answers
Which is most likely to cause damage or failure when used to check connections on the electronic modules?
Technician A says that the customer option codes can be changed in the electronic systems with a generic scan tool. Technician says in some cases, changing the fuel settings with a generic scan tool could result in poor engine performance. Who is right?
Technician A says that the throttle position sensor is interfaced to a 5-Volt reference. Technician B says when the throttle is manually opened, the scan tool should read a low voltage. Who is right?
Technician A says the EMC connectors should never be probed through the weather pack seals. Technician B says a test kit should be used to test connectors. Who is right?
Sometimes, two or more sensors are used to monitor actions in the computerized systems to verify relationship signals. Which of the sensors below would present a pairing for a systems relational signal? (please answer all that are correct)
Excessive heat can destroy solid state devices on trucks and equipment, like ECM''s. Technition A says that many ECM''s are air cooled with large fins. Technition B says that many ECM''s are cooled by cold plates with fuel circulation. Technition C says that some ECM''s are cooled by installing them on air ducts. Technition D says that some ECM''s are cooled by circulation of refrigerant from the A.C. Who is right?
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