Exam 31: Fuel Injection Diagnosis and Service

What could happen as a result of a leak in the fuel pressure regulator or the fuel pump check valve that allows the fuel pressure to slowly bleed down after engine shut down?

After disconnecting the TP sensor connector, you should test the sensor with a(n)____________________.

Technician A says the TPREL PID is the PCM's closed throttle reference voltage. Technician B says an idle trim relearn procedure should be done whenever a part of the IAC system is replaced or a repair is made to something that affects idle speed. Who is correct?

A good injector makes a rhythmic clicking sound as the injector is energized and de-energized several times each second.

Technician A says throttle body cleaner may be used to clean the IAC motor internal components. Technician B says on some vehicles, IAC motor damage can occur if the pintle is cleaned with throttle body cleaner. Who is correct?

On an ETC (throttle-by-wire)system, the APP (accelerator pedal position)and TP (throttle position)sensors are checked using a(n)____________________.

Name the components in an ETC (electronic throttle control)system.

Cracks and tears in the plumbing between the ____________________ sensor and throttle body are potential air leak sources that can affect the air/fuel ratio.

A(n)____________________ is used to test the internal electrical circuit of an injector.

When is a grounding strap required?

If an injector is not firing, how can you determine whether the injector is at fault or the PCM and wiring are the fault?

Do not use compressed ____________________ to flush or clean the fuel rail.

How is an injector balance test performed?

What is the correct procedure for checking an oxygen sensor with a voltmeter?

The activity of an O2 sensor is best monitored with a ______.

Always test replacement computers, modules, and computer chips for static prior to installation.

The best tool to verify that the engine is running excessively rich or lean is a(n)______.

Technician A says an intake manifold vacuum leak may cause a high idle speed. Technician B says a dirty IAC bypass passage will not cause the idle speed to be below specifications. Who is correct?

Operation of an O₂ sensor is checked with a(n)_____.

The voltage signal from most O₂ sensors varies between _____ and _____ volt(s).