C7.1 Industrial Engine and Generator Set Caterpillar

The Electronic Control Module (ECM) and most of the engine sensors are located on the left side of the engine. Refer to Illustration 1. For the remaining sensors that are attached to the engine, refer to Illustration 3. For the sensors and components on the Clean Emissions Module (CEM), refer to Illustration 5.

Note: In the following illustrations, some components have been removed in order to improve visibility.

Illustration 1	g02311267
Sensor locations on the left side of the C7.1 engine (1) Coolant temperature sensor (2) Fuel temperature sensor (3) Solenoid for the high-pressure fuel pump (4) Intake manifold air temperature sensor (5) Intake manifold pressure sensor (6) Fuel rail pressure sensor (7) 31-pin connector for the CEM (8) Electronic Control Module (ECM) (9) Barometric pressure sensor (10) Primary speed/timing sensor (11) Oil pressure sensor

Illustration 2	g02311353
Close up views of sensor locations on the left side of C7.1 engine (1) Coolant temperature sensor (2) Fuel temperature sensor (3) Solenoid for the high-pressure fuel pump (4) Intake manifold air temperature sensor (5) Intake manifold pressure sensor (6) Fuel rail pressure sensor (7) 31-pin connector for the CEM (8) Electronic Control Module (ECM) (9) Barometric pressure sensor (10) Primary speed/timing sensor (11) Oil pressure sensor

Illustration 3	g02313313
Sensor locations on the right side and top of the C7.1 engine (12) NOx Reduction System (NRS) differential pressure sensor (13) NRS inlet pressure sensor (14) NRS inlet temperature sensor (15) NRS valve including a position sensor (16) Engine intake throttle valve including a position sensor (17) Wastegate regulator (18) Secondary speed/timing sensor

Illustration 4	g02313374
Close up views of sensor locations on the top of C7.1 engine (12) NOx Reduction System (NRS) differential pressure sensor (13) NRS inlet pressure sensor (14) NRS inlet temperature sensor (15) NRS valve including a position sensor (16) Engine intake throttle valve including a position sensor (17) Wastegate regulator

Illustration 5	g02854896
Sensors and components on a typical CEM (19) Soot antenna (20) Aftertreatment Regeneration Device (ARD) ignition coil (21) ARD air pressure sensor (22) Heater relay for the ARD nozzle (23) Inlet pressure sensor for the DPF (24) Inlet temperature sensor for the DPF (25) Soot antenna (26) 40-pin harness connector (27) ARD pilot fuel control valve (28) ARD pilot fuel pressure sensor (29) Aftertreatment ID module (30) ARD combustion air valve including a position sensor (31) Spark plug