ENGINE MANAGEMENT SYSTEM
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2．Sample Cleaning
When necessary the samples may be cleaned in isopropyl alcohol or gasoline for one minute
with mating connectors in place and then air-dried
Oxygen Sensor
1．Description and Working Principle
This sensor is a device for monitoring the residual oxygen in the exhaust of an internal combustion
engine. It consists of the wide range sensor and stoichiometric sensor. Usually we use
stoichiometric sensor on the small engine. It is the feedback element for engine closed loop
control.
2．Installation Requirements
Mounting Angle with Level: ≥10 degree
Tightening Torque Requirement: 40-60 Nm
Ignition Coil
1．Description and Working Principle
This coil provides energy to the spark plug in the combustion chamber. The coil itself doesn’t have
a driver. The high voltage tower of the coil is connected to the spark plug using a high voltage
cable assembly. This is a non-serviceable component.
2．Installation requirements
The vehicle frame provides the mounting surface and mounting holes.
Mount coil close to the spark plug and keep the plug wire length very short (less than 6 “).
Mount coil away from any pick coil device. Especially, a VR type Crank / Cam sensor. Keep a
Min distance of 150 mm (around 6”) between coil and any VR sensor device.
Never route the coil C- wire with the same bundle as the Crank sensor wires. There is around
200 V peak potential between C- wire and engine ground. This voltage potential could cause a
noise on sensor cables.
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