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WorksheetsEM2 Pre-Test
Total questions: 15
Worksheet time: 8mins
Motronic engine management systems erase all learned values when:
The engine is restarted.
The DTC memory is erased.
Performing an output check diagnosis
The system is operating in open loop
Ignition system knock control is disabled by a failure in which of the following components?
Throttle Position (TP) Sensor G69
Heated Oxygen Sensor (HO2S) G39
Camshaft Position (CMP) Sensor G40
Throttle Drive (Power Accelerator Actuation) G186
Which of the following statements about Readiness Code setting is true?
If one of the readiness code bits is not set, the entire readiness code setting procedure must be performed.
HVAC leak detection is one of the readiness code bits.
When fault memory is erased, readiness codes are also erased.
All of the above.
The Malfunction Indicator Lamp (MIL) K83 flashes under which of the following circumstances?
An open circuit in the Engine Coolant Temperature (ECT) Sensor G62
A small or large leak in the evaporative emission system
Engine speed (RPM) at maximum governed limit
Engine misfires
The fuel system pressure was tested and is too low. Which of the following should be checked?
Fuel pump delivery rate
ECM coding
Restrictions in the fuel return line
Charging system voltage
The vehicle fails a residual fuel pressure test.
Technician A says that the fuel pressure regulator could be faulty.
Technician B says that the fuel pump check valve could be faulty.
Who is right?
A only
B only
Both A and B
Neither A nor B
Technician A says that Motronic engine management systems adapt to variables such as small vacuum leaks and altitude.
Technician B states that this process is known as default value learning.
Who is right?
A only
B only
Both A and B
Neither A nor B
A fuel pump delivery test can locate the causes of all of the following conditions EXCEPT:
Lean mixture problems.
Engine misfire problems.
Low engine performance problems.
Oxygen sensor problems.
The Camshaft Position (CMP) Sensor G40 provides feedback for the following function:
Camshaft adjustment.
Evaporative emissions control.
Fuel pump operation.
Operation of the tumble flaps.
The residual fuel pressure on a Motronic engine management system drops to zero very rapidly. When the fuel injectors are checked for leaks, it is found that one injector drips fuel at a rate of one drop every two minutes. What should be done?
The electrical connection to the injector should be disconnected and the test rerun
The search for the drop in residual pressure should focus elsewhere
Substitute the injector with a known good injector and perform the test again
Replace the fuel injector
Technician A says that the VAG 1598/39 and 1598/42 can be connected to only one electrical connector on the ECM at a time.
Technician B says that the VAG 1598/39 and 1598/42 can be connected to both electrical connectors on the ECM simultaneously.
A only
B only
Both A and B
Neither A nor B
The resistance curves for the throttle angle sensors G187 and G188 on the throttle valve control module are:
Parallel, one volt apart.
Opposite, like an “X.”
Identical to one another.
Flat, with no change.
Technician A says that a sporadic high input DTC for the Engine Coolant Temperature (ECT) Sensor G62 indicates that there is an intermittent open circuit in the sensor or wiring.
Technician B states that a sporadic incorrect flow DTC for the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 indicates that the fault was not present the last time that the ECM performed the component monitor test for that system.
A only
B only
Both A and B
Neither A nor B
Which of the following adaptation value MVBs suggest that fuel pressure and volume should be tested?
Oxygen sensor no signal
Fuel system rich
Fuel system lean
Both B and C
You must disconnect the battery or fuel pump electrical connector when the fuel system is open because:
It is a safety precaution.
Opening the driver door activates the fuel pump.
To prevent possible fuel spillage.
All of the above.
