KIT-TURBOCHARGER ACTUATOR 3624782 - Caterpillar

System Operation Description:The electrical power for the engine comes through a 63 amp circuit breaker, the Engine Control Switch (ECS), and the Electronic Control Modules (ECM). The engine has a Primary Electronic Control Module (ECM) and a Secondary Electronic Control Module (ECM). A signal is provided to the ECM that senses the position of the ECS. When the ECM senses battery voltage on this input, the ECM will power up. If the voltage is removed from this input, the ECM will power down. If the remote start switch is in the start position and the remote emergency stop switch is not activated, the engine will start when the ECS is in the AUTO position. The ECM will power up when the ECS is in the AUTO, START, or STOP positions.Battery voltage is supplied to the ECM through the circuit breaker for the ECM and the ECM relay. The ECM relay is energized when the ECS is in the AUTO, START or STOP positions and the emergency stop button is not activated.When the emergency stop switch is activated, power is removed from the coils of the ECM relays. The contacts of the ECM relay open removing the battery power to the ECM. An "emergency stop lockout relay" performs an emergency lockout function that prevents the ECM from powering up. Regardless of the reason for activation, the Engine Control Switch (ECS) must be turned to the OFF/RESET position for three seconds. This resets the ECM and the air shutoff timer. In addition to turning the ECS to the OFF/RESET position, the operator must manually open the air shutoff valves before starting the engine.The presence of two + Battery connections and two − Battery connections to the ECM reduce harness resistance. All of these connections must be complete in order to ensure proper engine operation.
Illustration 1 g00973881
Typical example
Test Step 1. Check for Connector Damage.
Verify that the circuit breakers are not tripped.
Turn the circuit breaker for the battery to the OFF position.
Turn the ECS to the OFF/RESET position.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors. Refer to the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
Check the customer connector (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
Check the harness and the wiring for abrasion and for pinch points. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring should be free of corrosion, of abrasion or of pinch points.Results:
OK - The connectors and wiring are okay. Proceed to Test Step 2.
Not OK - The connectors and/or wiring need repair.Repair: Repair the connectors or wiring and/or replace the connectors or wiring.STOPTest Step 2. Check the Voltage to the