PIN 4V3921 - Caterpillar

ADEM II Engines
Illustration 1 g00554200
Typical example of the electronic control system components for an ADEM II Engine (left side view) (1) Secondary engine speed-timing sensor (2) Primary engine speed-timing sensor (3) Turbocharger outlet pressure sensor (4) Unit injector connector (5) Connector for the inlet air temperature sensor (6) OEM ground (7) ECM connector ("P2") (8) Electronic Control Module (ECM) (9) ECM connector ("P1") (10) TC probe connector ("P26") (11) TC probe connector ("J26") (12) Atmospheric pressure sensor (13) Fuel temperature sensor connector
Illustration 2 g00554241
Typical example of the electronic control system components for an ADEM II Engine (right side view) (14) Oil pressure sensor connector (15) Coolant temperature sensor connector (16) Coolant flow switchADEM III Engines
Illustration 3 g00821380
Typical example of the electronic control system components for an ADEM III Engine (left side view) (1) Secondary engine speed-timing sensor (2) Turbocharger outlet pressure sensor (3) Unit injector connector (4) Fuel pressure sensor (5) Inlet air temperature sensor (6) TC probe connector P400 (7) Electronic control module (ECM) (8) ECM connector (J2/P2) (9) ECM connector (J1/P1) (10) Atmospheric pressure sensor (11) Fuel temperature sensor (12) Primary engine speed-timing sensor
Illustration 4 g00821440
Typical example of the electronic control system components for an ADEM III Engine (right side view) (13) Coolant temperature sensor (14) Coolant flow switch (15) Oil pressure sensorElectronic Control Module (ECM)
Illustration 5 g00554256
Electronic Control Module for an ADEM II engine (1) ECM connector ("P2") (2) Electronic Control Module (ECM) (3) ECM connector ("P1")
Illustration 6 g00821469
Electronic Control Module for an ADEM III engine (1) Electronic Control Module (ECM) (2) ECM connector ("P1") (3) ECM connector ("P2")The engine uses an Electronic Control Module (ECM) that is based on a microprocessor. The ECM is mounted on the left rear side of the cylinder block.The inputs and the outputs to the control module are designed to withstand the short circuits to the battery voltage without damage to the control. The electronic engine control system has the following features that are designed into the system.
Resistance to radio frequency
Resistance to electromagnetic interferenceThe ECM power supply provides electrical power to all engine mounted sensors and actuators. Reverse voltage polarity protection and resistance to vehicle power system voltage swings or surges have been designed into the ECM. The ECM also monitors all input from the sensors. The ECM also provides the correct outputs in order to ensure desired engine operation.The wiring harness provides communication or signal paths to the various sensors. The ECM performs many functions. The ECM contains all of the engine performance information. The ECM contains all of the information for the emission certification. Several examples are listed: engine timing, air/fuel ratio and rated fuel position control maps.The ECM is programmed to run diagnostic tests in order to separate a fault to a specific circuit. Once a fault is detected, the fault can be displayed on a diagnostic lamp. A multimeter can be used to check most problems. The ECM will log most of the diagnostic codes that are generated during engine operation. The logged codes or the active codes