SEAL-U-CUP 9X7404 - Caterpillar

System Operation Description:The ECM can crank the engine when the push buttons are in the closed position. When the engine is in the start up mode, the ECM will activate the prelube system. When the prelube cycle is finished, the ECM will begin the first crank cycle.The crank cycle will continue for the time that is equal to the crank duration that has been programmed or the crank cycle will continue until the engine speed reaches the crank terminate speed. If crank terminate speed is not reached before the crank duration, the starting motor will deactivate for a time that is equal to the cycle crank time.This process will repeat for a programmed amount of times (maximum number of crank cycles). If the engine does not start the starter mode on the Electronic Service Tool will display "OVERCRANK". The engine control will be in an idle state.The ECM also has the ability to detect a faulty engagement of the starter. If the crank cycle is initiated and no engine speed is detected for 3 seconds, the start relay is deactivated for a time that is equal to the crank duration. The start relay is energized again. This process will repeat for a programmed amount of times (maximum number of crank cycles).
Illustration 1 g00850421
Test Step 1. Check for Connector Damage
Turn the engine control to the OFF position.
Turn the breaker at the battery to the OFF position.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors. Refer to 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. Stop.Test Step 2. Check the Emergency Stop and the Run/Start/Stop Switch.
Verify proper operation of the Stop Switches.Expected Result:The customer supplied shutdown switch should operate normally.Results:
OK - The customer supplied shutdown switch operates correctly. Proceed to test step 3.
Not OK - The customer supplied shutdown switch does not operate correctly.Repair: Repair the switch or wiring and/or replace the switch or wiring. Stop.Test Step 3. Attempt to Start the Engine
Connect the ET to the service tool connector.
Connect the main power.
Deactivate the engine shutdowns.
Close the Normal Stop Switch. Monitor the start up mode on ET.
The crank cycle should continue for the time that is equal to the crank duration that has been programmed or the crank cycle should continue until the engine speed reaches the crank terminate speed.Expected