The exhaust gas or oxygen (O2) sensor is a device used by the vehicle's engine computer to measure the amount of oxygen present in the exhaust stream after combustion has taken place. This information is used by the computer to maintain the ideal air/fuel ratio.
The heart of oxygen sensor is a hollow cone-shaped piece of ceramic material called zirconium dioxide that is platinum coated on the inside and outside. This platinum coating provides the electrodes, as in a battery. During engine operation, exhaust gases are forced to pass over the outside of the sensor element while the inside is exposed to outside air (also referred to as reference gas). When the amount of oxygen in the exhaust differs from the reference gas, a voltage is produced.

A lean air/fuel ratio mixture has higher oxygen content in the exhaust gas. In this condition, the amount of oxygen ions present on both the inner and outer sensor surface are nearly equal, creating a lower output voltage. When the mixture gets too rich, however, there is a high amount of hydrocarbons in the exhaust as well as a low amount of oxygen. This condition causes an unequal amount of oxygen ions present on the exhaust side of the sensor tip compared to the inside, which causes a proportionately higher sensor voltage to be generated. The voltage output of a normal operating oxygen sensor will fluctuate rapidly back and forth between approximately 100mV (0.1V) and 1000mV (1V) at approximately 1200 to 155 RPM with a warm engine. The sensor switch point is the voltage value at which a radical change in output voltage occurs at around the ideal mixture ratio. Voltages above or below the switch point indicate that the air fuel ratio is rich or lean, respectively. The microcomputer tries to keep the sensor voltage at the ideal switch point by controlling fuel input to the engine.
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5:09 PM
Categories: SENSOR. Author: Bisnis Pulsa GSP

ECU (Electronic Control Unit) contains electronic component that are extremely sensitivy to power surges, static, electricity, and phisical shock. Whenever working on or around microcomputer-based system, the following procedures should be used to avoid damaged to electronic component.

• Power must always be OFF wen removing or installing Ecu wiring harness connector. Make sure the ignitions is turned off and the ECu Fuse Removed.
• To get rid of any static charge buildup, frequently touch a known good ground with your hands or use statistic protection kit during installation of a ECu. This is especially important if you are moving your feet on a carpet or sliding across a seat.
  
• Jumper cable should be connected and disconnected with the ignition OFF to avoid possible power surges. You should avoid both giving and getting jump starts.
• Always remove the battery cable before charging the battery in car.
• Hande the ECu unit with extreme care. Dropping it from about waist height onto a concrete floor can do permanent damage.

• never apply 12V directly to any components of an ECu control System unless intructed specifically to do so. Some components are designed to operate at much lower voltage levels and can be destroyed almost instantly by this higher voltage.
• When measureing microcomputer-controlled components, suplay voltage with multimeter and separate ane test probe lead from other. If the two test probe leads accidentally make contact with each other during measurement, the circuit will be stored, resuting in damage to the control unit's power transistor.
• When connecting disconnecting pin connectors into or from the microprosessor port, take care not to damage pin terminals.
• When installing a replacement engine computer or other electronic module, take the unit out of its protective antistatic bag at the last possible minute.

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6:47 AM
Categories: Electronic Control Unit / ECU, News. Author: Bisnis Pulsa GSP

An ignitions module houses integrated circuits that contai transistor, diodes, resistor and capacitor. A power within the module is used to switch primary current ON and OFF. It works much like a mechanical switch, except that it has no moving part and is turned ON and OFF by timed electrical pulses.

Although many different type of ignition modules are used, they all perform basically the same function: switch primary current On and Off. That image Shows an ignitions module that uses a singgle transistor to control primary current to ignition coil of a distributor-type ignitions system.

the image shows an ignition module that uses

IGNITION COIL DRIVER POWER IC

The modern ignition coil driver power IC, One chip, small and....

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4:19 PM
Categories: Driver Coil, Ignitions. Author: Bisnis Pulsa GSP