ENGINE MANAGEMENT SYSTEM
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This sensor has two functions. The first is the intake manifold air temperature, it provides a
resistance that varies as a function of temperature within prescribed tolerance limits. The
second is the intake manifold air pressure; it provides a voltage varies as the intake air
pressure.
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.
3．DOs and DONTs
Ignition Coil Handing
Action Reason
DO NOT: Install the low voltage connectors with
the power applied
This might cause an unwanted secondary firing,
possibly leading to personal injury
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