BEARING AS 6E1571 - Caterpillar

System Operation Description:The Electronic Control Module (ECM) receives two input signals from the Start/Run/Stop switch. The two input signals should have the same logic level. If two different signals are detected during the powerup, the ECM will determine that one of the signals is incorrect. The duplication of the signals permits the ECM to know if there is a problem in the wiring.When both of the input signals are high or open, the ECM assumes that the Start/Run/Stop switch is in the STOP position. When both of the input signals are low or shorted to the − Battery terminal, the ECM assumes that the Start/Run/Stop switch is in the START position. After the Start/Run/Stop switch is turned to the START position, the ECM will initiate the starting sequence. The ECM will energize the prelube system if the prelube system is available and activated. After the prelube cycle is completed the ECM will energize the starting solenoids for the starting motors. If both of the signals go high or open while the engine is running, the engine will stop.If the engine is running and one of the inputs from the Start/Run/Stop switch changes states, the ECM will ignore the inputs from the Start/Run/Stop switch until power is cycled to the ECM. If this occurs, you must use the Emergency Stop switch or you must disconnect the power to the ECM in order to shut down the engine.If the inputs from the Start/Run/Stop switch are in opposite states at the beginning of a crank cycle, the ECM will not initiate the crank cycle. If this condition occurs, the engine may be started by using the Manual Crank switch. If you start the engine with the Manual Crank switch, you must use the Emergency Stop switch or you must disconnect the power to the ECM in order to shut down the engine. A diagnostic code will be logged and a diagnostic code will be active for this problem. The diagnostic code for this problem will be active until the ECM is powered down.
Illustration 1 g00892095
Test Step 1. Check for Connector Damage.
Disconnect the main power.
Thoroughly inspect the ECM connector J1/P1. 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 pinch points.Expected Result:The connectors and wiring should be free of the following problems: damage, corrosion, abrasion and incorrect attachment.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 Switch Status on