Cummins calls their electronic engine control system:
Detroit Diesel calls their electronic engine controls:
Technician A says that HEUI (hydraulic electronic unit injector) does NOT require adjustment. Technician B says that an EUI (electronic unit injector) does NOT require adjustment. What 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 circuitry 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.
Active faults, refer to faults or conditions that have previously happened.
Inactive faults are faults in memory and are not currently happening.
How do the electronic unit injector (UEI) control fuel timing.
Electronic diesel engine fault codes may indicate:
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 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.
When voltage tests are made on electronic circuit components, the circuit should be:
Which of the following are inserted into ECM and the wiring terminal sockets to enable testing by digital multi-meter probes and minimize potential damage?
Which of the following statements is the most correct?
Electronic controlled diesel engine ECM operates on a reference voltage of 12 volts, plus or minus 5 volts.
A computer system monitors battery charge voltages at all times to ensure:
A HEUI fuel injection system involves an engine oil hydraulic system and a diesel fuel hydraulic system.
Mechanically actuated injection systems cannot be controlled electronically.
A HEUI fuel injection system uses three different hydraulic actuation pressures within its system.
The injection actuation pressure control valve, also called the rail pressure control valve, alter 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.
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.
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 a HPCR fuel system, fuel delivery pressure to the injectors is controlled by:
In the HPCR fuel injection system, the injector needle valve is opened when:
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 manufacturers) 2/ the actuator harness and 3/ the:
Engine protection is incorporated into the computerized systems because it can sense:
Computer controlled injection systems 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 expressed as pulse width. 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.
The computer controls the fuel injection process by gathering information from the sensors.
Which of the following acronyms does not relate to computers and not belong in this list?
Input sensors generally monitor engine systems for correct operations. Which is not?
The modern ECM and its memory systems can store all kinds of information except:
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 generic scanner or laptop, changes to settings cannot be performed without the:
In most computerized fuel systems, what is the voltage in the sensing circuits?
If the wire attached to the engine crank or cam position sensor or sensors were to come off, the engine would:
Which type of sensor would be a potentiometer?
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.
Computer memory is considered to be volatile or non-volatile memory. Which of the following would be considered volatile?
Thermistors, pulse generators and potentiometers are all different types of:
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