Engine System Overview 2.3 Engine Component Overview Note: Petroleum ATEX engine sensors are provided with approved ATEX “pigtail” connections. The exception is the fuel temperature sensor on the C18 ACERT and C32 ACERT that is protected by a guard. 2.3.1 Engine Control Unit (ECU) The ECU is generally located on the left rear side of the engine. The ECU has two connectors, one for the Caterpillar engine harness and the other for the customer harness. 2.3.1.1 Engine Connector (120-pin connector, J2/P2) Engine system and control information is transmitted between the 120-pin connector on the engine ECU and the engine components through the engine harness.
The engine harness provides the interface to the following engine components: • Engine Sensors • Fuel Injection System 2.3.1.2 Customer Connector (70-pin connector, J1/P1) Customer control and display information is transmitted between the 70-pin connector on the engine ECU and the customer-installed components through the customer harness. The customer harness provides the interface to the following components: • Battery • Data Links • Customer Components I N D U S T R I A L E N G I N E E L E C T R O N I C S 8 C7 ACERT - C32 Industrial (Equipped w/A4 ECU) Factory Wiring C7 ACERT/ C9 ACERT C11 ACERT/ C18 ACERT C27 ACERT/ C32 ACERT Fuel injector: HEUI injector x Fuel injector:
MEUI injector x x High efficiency pump x Speed/timing sensor (cam) 2x x x Speed/timing sensor (crank) x x Compression brake solenoids (optional) x (C15 ACERT, C18 ACERT) Fuel temperature sensor x x Injection actuation pressure sensor x Atmospheric pressure sensor x x x Boost (intake manifold air) pressure sensor x x x Intake air temperature sensor x x x Coolant temperature sensor x x x Fuel pressure sensor x x x Oil pressure sensor x x x Intake air heater x