GASKET-MANIFOLD 2F4570 - Caterpillar

System Operation Description:The direct fuel control mode enables the engine to be controlled by an external governor. You must install the components of the signal converter for the direct fuel control mode in order to operate in direct fuel control mode. The configuration parameter must be programmed to "ON" in order for the Electronic Control Module (ECM) to respond properly to the external governor.The input to the signal converter is a 0 to 200 mA signal. The signal is received from the external governor. The output signal from the signal converter is a pulse width modulated signal (PWM).The output signal varies with the current to the signal converter. The ECM calculates the desired fuel from the PWM signal.You have a valid signal when the duty cycle is between 2 and 95 percent. If an invalid signal is received, the engine will automatically be set to a minimum fuel setting and the engine will shut down.The droop is not used for the direct fuel control mode. Disconnecting the droop at the ECM will not affect engine operation.
Illustration 1 g00836404
Typical exampleTest Step 1. Check for Connector Damage.
Turn the Engine Control Switch (ECS) to the OFF/RESET position.
Turn the battery disconnect switch to the OFF 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 6.0 N m (55 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. The harness and wiring are 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 are not okay.Repair: Repair the connectors or wiring and/or replace the connectors or wiring.STOPTest Step 2. Check the Current Input.
Measure the current to the signal converter.Note: Some external governors may only be able to output approximately 150 mA. This should not be seen as