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Glossary of terms you will come across during your Phase 2 training.


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C

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Special spanner used in the hydraulics module for removing cap ends from rams.

C spanner

The spanner below is an ajdustable C spanner:

Adjustable c spanner

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The Cabra Training CentreUp until December 2010, the Cabra Training Centre was the home of the Construction Plant Fitters' Section. Here, Phase 2 apprenticeship training was delivered in the trade of construction plant fitting.

With the closure of Cabra, the CP Fitters' Section was moved to a temporary home in a satellite unit in Baldoyle. Having completed four Phase 2 apprenticeship courses there in May 2012, it is now apparent that the next two courses will also run there from July 9th, until November 23rd, 2012. We have no official word on the future of the CP section or the Phase 2 course.

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Camber angle, positive or negativeThe camber angle of a wheel is a measurement of how much the wheel tilts away from the vertical, when viewed from the front.

If the wheel tilts outwards, it is positive camber, and if it tilts inwards, it is negative camber.

If the camber angle is added to the kpi, and quoted in the manual as one angle, this is called the included angle.

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Camsaw distributors logo

Camsaw Distributors, Laois.

Suppliers of parts: Stihl, Briggs and Stratton etc. Can do postal delivery.

Paul Carney is the owner.

From the website:

Established in 1987 by proprietor Philip Carney, our business is family run throughout the County for its friendly, yet highly professional business ethic. The business has gone from strength to strength over the last number of years. We have 9 staff working full time from our Portarlington base. This includes 3 Sales Representative’s who travel around the country promoting and selling our wares in the North, South, East and West of Ireland. Read More...

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Camshaft operating an inlet and exhaust valveShaft driven by the crankshaft, at half engine speed. The camshaft opens the inlet and exhaust valves (the valves are closed by their own valve springs). The camshaft may also be fitted with an eccentric lobe to drive the lift pump, and may also be fitted with a skew gear to drive the oil pump, or other components such as a fuel injection pump.Camshaft

Read more about the camshaft here.

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Controller Area Network. This is a serial databus that carries information and signals to and from the various components of an electronically managed engine. It can also bring information from other electronically managed components such as gearboxes and air conditioning units.
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Bus: In the context of electronic engine and vehicle management, a bus is an electrical pathway over which data can be transmitted. Think of them as electronic roadways along which the data travels.

CAN stands for Controller Area Network. This is an electronic network over which the various vehicle systems can communicate with each other.

Each vehicle system is known as a station. For example, engine management is a station on the bus, the instrument panel on the dashboard is a station, transmission shift control is a station.

The CAN bus is a serial bus. In other words, data is relayed on the bus one bit at a time, one after the other.

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The CAN bus is simply a pair of wires, often twisted around each other, running around the vehicle and terminated at either end of the two-wire network with resistors of 120 Ohms. The only components connected to the CAN bus are the electronic control units (nodes). Other components, such as sensors, motors, light bulbs, switches, etc. are wired only to the electronic control units. 

A vehicle which uses CAN bus for on-board diagnostics can only respond to an OBD-II request from a tester which uses CAN bus. From model year 2008 vehicle manufacturers must use the OBD protocol specified in ISO 15765, also known as Diagnostics On CAN.

Two wires of CAN bus, CAN-H and CAN-L, will have the same voltage when idle (about 2.5V), or a voltage difference of 2V when a signal is placed on the CAN bus. When a signal is placed on the CAN bus the CAN-H line is at a higher voltage than the CAN-L line.

Each electronic control unit have its own CAN identity code, like an address (may respond to several CAN id codes). If an electronic control unit is to communicate to another it will need to know the CAN identity code of the recipient.

obd2 pinoutA simple check to see if the CAN bus is in use in a vehicle, and accessible via the OBD socket, is to connect a resistance meter across pin 6 and pin 14. Due to the combined resistance of the two termination resistors at 120 Ohms each the overall resistance should be read as 60 Ohms.

OBD-II provides access to numerous data from the ECU and offers a valuable source of information when troubleshooting problems inside a vehicle. The SAE J1979 standard defines a method for requesting various diagnostic data and a list of standard parameters that might be available from the ECU.

The various parameters that are available are addressed by parameter identification numbers or PIDs which are defined in J1979. For a list of basic PIDs, their definitions, and the formulae to convert raw OBD-II output to meaningful diagnostic units, see OBD-II PIDs.

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The ability of a body to hold an electrical charge. One such body capable of holding an electrical charge is a capacitor.
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Assorted capacitorsAn electrical device which electricity can flow into, but not through. This makes it suitable for briefly storing electrical charge. There are many uses for capacitors in automotive electrical circuits.

For example, ever notice how the interior lamp in your car does not go out the minute you close the door? And when it does eventually go out, the lamp dims down to nothing, rather than suddenly extinguish? This is a capacitor at work.
Capacitors are also useful for suppression to avoid sound interferance on radios, or can be used in time delay circuits, such as those used to control glow plug circuits.

The picture here shows a variety of capacitors. The two on the right of the picture are electrolytic capacitors.

Symbols for a capacitorThe symbols shown here are for a non-polarised capacitor on the left and a polarised capacitor on the right.

During your time on Phase 2, you will come across electrolytic capacitors during your studies of basic electronics and time delay circuits.

Note: if a capacitor is polarised, it must be connected correctly into a circuit, otherwise damage to the capacitor and/or the circuit will result. Capacitors can only store  DC electricity, they cannot conduct it. AC passes through capacitors as though they weren't there.

Check out this video to see what happens when a polarised capacitor is connected with the poles reversed. Note - This is dangerous, and should never be attemptedWMP video

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