Exam 12: Instrumentation and Warning Lampsinstrumentation and Warning Lamp System Diagnosis and Repair

How would you test a warning lamp that does not come on during the prove-out on a system with a normally open switch?

There are three types of sending units associated with electromechanical gauges: a thermistor, a piezoresistive sensor, and a mechanical ____ resistor.

Technician A says a tachometer is used to measure drive shaft speed. Technician B says a tachometer receives its signal from the plus side of the ignition coil. Who is correct?

How is the maintenance minder reset?

Before removing the instrument panel, always disconnect the battery negative cable.

List the four types of electromagnetic gauges.

The fuel gauge of a digital instrument cluster is missing two segments of its numerical display. Technician A says the cluster has excessive ground circuit resistance. Technician B says the cluster needs to be replaced. Who is correct?

What is the purpose of the head-up display?

A gauge that constantly reads low when the ignition switch is in the RUN position indicates an open in the ____.

What must be done if the odometer needs to be replaced?

Equal pressure in the brake hydraulic system will cause the brake warning light to come on.

If equal voltage is applied to both sides of a lamp, the lamp remains off because current cannot flow.

A gauge that reads high when the ignition switch is placed in the RUN position indicates there is an open in the sending unit circuit.

A ____ system displays visual images onto the inside of the windshield in the driver's field of vision.

What is the most common type of fuel level sending unit?

A(n) ____ is a device that displays the measurement of a monitored system by the use of a needle or pointer that moves along a calibrated scale.

What additional procedures may be necessary if the instrument panel requires replacement?

Electromagnetic gauges use heat to produce needle movement.

Technician A says a normally open switch is used in most coolant temperature warning light circuits. Technician B says most oil pressure warning circuits use a normally closed switch. Who is correct?

Technician A says air core electromagnetic gauges and quartz swing needle displays are similar. Technician B says in quartz needle displays, the A coil is connected to the system voltage and the B coil receives a voltage proportional to input frequency. Who is correct?