Cub Cadet Challenger 500, Service Manual

Page: 228 / 244

Engine Management System
7 ‐ 7
Throttle Body Removal

Disconnect negative terminal of the battery.

Disconnect electric lead wire of throttle position sensor coupler, stepper motor
coupler and MAP/MAT sensor coupler (if this sensor is mounted on the throttle
body).

Disconnect accelerator cable from throttle body.

Remove air cleaner outlet hose and throttle body outlet hose.
Cleaning Procedure
If there is a cover on the bottom, it may be removed and cleaned using carburetor
cleaner (3M brand recommended). Once the throttle body cover is removed, spray the
throttle body cleaner inside the air passage, and use a brush to gently dislodge the dirt,
gum and varnish that may be present. Do not let the bypass holes be blocked by dirt or
foreign particles.
Throttle Body Installation
Reverse the removal procedure for installation noting the following:
• Adjust accelerator cable play.
• Check to ensure that all removed parts are back in place.
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
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.
Installation
The sensor needs to be installed by hand, and torque to desired specification.
Torque spec.
20 – 25Nm or 15 – 18 ft lbs