CONTROL GP-MONITOR 1856778 - Caterpillar

Illustration 1 shows the main components of the electronic control system.
Illustration 1 g00905966
Schematic of the electronic control system with air/fuel ratio control
(1) Remote Control Panel (Status)
(2) Electronic Control Module (ECM) in a remote panel
(3) Manifold air pressure sensor
(4) Engine speed sensor (magnetic pickup)
(5) EGP actuator
(6) Oxygen buffer
(7) Oxygen sensor
(8) Inlet manifold temperature sensor
(9) Actuator for the fuel valve
(10) Fuel valve
(11) Caterpillar Electronic Technician (Cat ET)
(12) Digital Diagnostic Tool (DDT)
(13) Engine speed/timing sensor
(14) Detonation sensor
(15) Engine mounted junction box
(16) EIS Control Module
(17) Ignition transformer
(18) Spark plug Control panel (1) and ECM (2) are remotely mounted from the engine. The control panel enables the operator to control engine operation. The Status Control Module (SCM) in the control panel and the ECM monitor engine operation. The SCM and the ECM also display operating parameters and diagnostic codes. For information on the monitoring system, refer to Systems Operation, "Engine Monitoring System".The ECM uses manifold air pressure sensor (3) and engine speed sensor (4) to govern the engine speed with actuator (5). For information on governing, refer to Systems Operation, "Governor".The ECM controls the air/fuel ratio with actuator (9) and with fuel valve (10). The ECM monitors the air/fuel ratio with manifold air pressure sensor (3), oxygen buffer (6), oxygen sensor (7), and inlet manifold temperature sensor (8). For information on the air/fuel ratio control, refer to Systems Operation, "Air/Fuel Ratio Control".Note: If the engine has the air/fuel ratio control, the ECM sends information from the manifold air pressure sensor to the EIS control module. The information is sent via the Cat Data Link. If the engine does not have the air/fuel ratio control, the manifold air pressure sensor sends information directly to the EIS control module.EIS control module (16) is mounted on the engine. The control module activates ignition through ignition transformer (17) and through spark plug (18). The control module bases ignition timing on signals from manifold air pressure sensor (3), engine speed/timing sensor (13), and detonation sensor (14). For more information on the EIS control module, refer to Systems Operation, "Ignition System".The ECM and the EIS control module communicate via the CAT Data Link. Wiring harnesses are routed through engine mounted junction box (15). Both the ECM and the EIS control module can be programmed for individual installations. The Cat ET (11) or a DDT (12) is used for programming. Either electronic service tool can be connected to the ECM or to the junction box. For information on the programmable parameters, refer to Systems Operation, "Electronic Control System Parameters".Engine Controls
The engine may be equipped with the following control panels for engine operation:Customer Supplied Control Panel
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