3512C Petroleum Engine with Dynamic Gas Blending Caterpillar

Illustration 1	g03379667
(1) ECM (Left-hand side front of engine) (2) ISM (Right-hand side front of engine)

The Electronic Control Module (ECM) (1) controls most of the engine functions. The module is an environmentally sealed unit that is in an engine mounted terminal box. The ECM monitors various inputs from sensors in order to control the engine. The ECM supports the following primary functions:

• Start/stop control

• Injection timing control

• Governing of the engine

• Data link communications

• Diagnostics of the electrical system

• Monitoring and protection of engine operation

The Integrated Sensor Module (ISM) (2) supports the following functions:

• Monitoring of the cylinder exhaust temperature sensors

• Monitoring of the detonation sensors

The modules do not have a removable personality module. The software is changed by programming a flash file into the module via the Caterpillar Electronic Technician (ET).