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TL960 SERVICE MANUAL

powered by the 3126B engine are encouraged to read and study the Caterpillar Operation and Maintenance manual at the earliest opportunity. Certain operational characteristics should be discussed with the bus operators to familiarize them on how the ECM controls various functions.

Electronic Control Module

The ECM controls its various functions through signals from the following sensors: Injection Actuation Pressure Turbo Boost Pressure Engine Speed Engine Timing Coolant Temperature Air Intake Temperature Throttle Position Vehicle Speed

The ECM provides total electronic control of the start and duration of fuel injection. Data furnished by the sensors enable the ECM to control the fuel injected into each cylinder, which optimizes performance related to Normal and Cold weather starting, warm up, emissions, noise, fuel economy, and driveability.

Top Engine Limit

The ECM controls the top rpm of the engine, which is 2640 set at the factory, by limiting the fuel to the injectors. The engine does not have a mechanical governor.

Start-Up and Emission Control

White smoke is reduced by controlling injection timing and delivery during cold operation and acceleration. The ECM uses various sensor inputs to calculate timing and delivery that will not produce smoke.

Vehicle Speed Limit

Maximum road speed is predetermined by the owner/operator at

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