Cub Cadet Challenger 500, Service Manual

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Engine Management System
7 ‐ 8
Oxygen Sensor
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. We
typically use a stoichiometric sensor on a small engine. It is the feedback element for
engine closed loop control.
Installation
Torque
40 – 60Nm or 30 – 44 ft lbs
Ignition Coil
The coil receives 12v battery power and a signal from the pickup coil. It then transforms
12v and sends high voltage to the spark plug. This is a non-serviceable component.
Installation Requirements

The vehicle frame provides the mounting surface and mounting holes.

Mount the coil close to the spark plug and keep the plug wire short in length
(6 inches or less if possible).

Mount the coil away from any pickup type devices, especially the crank/cam
sensor, and route wiring away from these sensors as they can interfere with the
signal.
Take care when working with ignition coils, improper handling can cause personal injury
or damage test equipment.
Fuel Pump Module
Fuel pump module consists of fuel pump to generate the fuel flow, and a pressure
regulator to regulate the fuel pressure. This is all in one unit and is a non-serviceable
component.
Service Procedures
Precautions:
Before attempting any service on the fuel system, the following cautions should always
be followed for personal safety and to avoid system damages.

Disconnect negative cable at battery.

DO NOT smoke, and place a ‘NO SMOKING” sign near the work area.

Make sure to have a fire extinguisher handy.