BOLT-SOCKET HEAD 8C6364 - Caterpillar

System Operation Description:The Electronic Control Module (ECM) has the ability to crank the engine when the Engine Control Switch (ECS) is placed in the START position. The engine control will start the first crank cycle, when the ECS is placed in the START position. The crank cycle will continue for the time that is equal to the cycle crank time 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 cycle time, the starting motor will deactivate at the end of the crank cycle time.This process will repeat for a programmed amount of times "Total Number of Crank Cycles". If the engine does not start, Caterpillar Electronic Technician (ET) will display "OVERCRANK". The engine control will be in an idle state. The process can be restarted by turning the ECS to the OFF/RESET position. Next, turn the ECS to the STOP position. Then turn the ECS to the START position.After the ECS is placed in the START position, the ECM will begin the prelube cycle. The ECM will send a signal to terminal BH of the customer connector after the prelube cycle is complete. The engine start signal will return on terminal BJ of the customer connector to the starting motor relays "SMMS1" and "SMMS2". The starting motor relays will energize closing the normally open contacts of the relays. Current will flow to the starting motors. The starting motors will begin to crank the engine.The engine can be manually started by using the "crank override switch" which is located on the inside of the instrument panel.
Illustration 1 g01009170
Typical example
Test Step 1. Check for Connector Damage.
Turn the ECS to the OFF/RESET position.
Turn the circuit breaker for the battery 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 1 N m (53 9 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 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 need repair.Repair: Repair the connectors or wiring and/or replace the connectors or wiring.STOPTest Step 2. Attempt to Start the Engine.Note: After the ECS is placed in the START position, the ECM will begin the prelube cycle. The ECM will send a signal to terminal BH of the customer connector after the prelube cycle is complete. The engine start signal will return on terminal BJ of the customer connector to the starting motor relays "SMMS1" and "SMMS2".