ENGINE MANAGEMENT SYSTEM
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4．Cleaning Procedure
If there is cover on the bottom, it may be removed and cleaned using carburetor cleaner (3M make
recommended). Once the throttle body cover is removed, spray the throttle-body cleaner inside the
shipping air passage, and use the brushes to gently dislodge the dirt, gum and varnish that are
present. Do not let the bye pass holes be blocked by dirt or foreign particles.
5．Throttle Body Installation
Reverse the procedure for installation noting the following:
Adjust accelerator cable play
Check to ensure that all removed parts are back in place.Reinstall any necessary part which
have not been reinstalled
6．Precautions
Do not submerge TPS in any cleaning fluid.
Always open the throttle valve using the throttle cable or lever.
Do not hold the valve at opening position by inserting tools or any sticks into the bore. The
valve may be warped and the bore may be scratched. This type of damage may keep the
throttle from opening easily or fully closing.
Engine Coolant Temperature Sensor
1．Description and Working Principle
This sensor is used in water cooled engines. It provides a resistance that varies as a function of
temperature within prescribed tolerance limits. The sensor has a negative temperature
coefficient of resistance. This is a non-serviceable part.
2．Installation Requirements
Dynamic Torque Requirement: The sensor shall be hand into the application and then driven
by a driver with a maximum no load speed of 400 rpm or installed to the desired torque by a
hand torque wrench (5/8” hex). The recommended installation torque is: Minimum: 20
N·m
Maximum: 25 N·m
Static Torque Requirement: The torque required to remove the sensor from the mating hole
shall be within 200% of the installation torque mentioned above.
3．Sample Cleaning
When necessary the samples may be cleaned in isopropyl alcohol for one minute with mating
connectors in place and then air-dried
Intake Air Pressure and Temperature Sensor
1．Description and Working Principle
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.
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