SPRING 4K3635 - Caterpillar

System Operation Description:The Electronic Control Module (ECM) has the ability to crank the engine when the circuits for the "Deck Start/Run/Kill" switch are complete. 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 cycle crank time, 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 (Total Number of Crank Cycles). If the engine does not start the start-up mode on the Caterpillar Electronic Technician (ET) will display "OVERCRANK". The engine control will be in an idle state.When the "Deck Start/Run Kill" switch is turned to the START position the "Start Deck Engine Relay" energizes. A set of normally open contacts from the "Start Deck Engine Relay" close. This changes the Start/Run/Stop inputs to the ECM from a high state to a low state. The ECM energizes the "Start Relay" through the "Start Enable Relay" output. A set of normally open contacts from the "Start Relay" close energizing the "Start Deck Engine Solenoid". Refer to Illustration 1.
Illustration 1 g00855475
Typical exampleTest Step 1. Check for Connector Damage.
Turn the circuit breaker CB-8 to the OFF position.
Turn the main 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 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 are not okay.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Stop.Test Step 2. Attempt to Start the Engine
Start the Cat ET.
Turn the main disconnect switch to the ON position.
Turn the main power switch to the ON position.
Turn the circuit breaker CB-8 to the ON position.
Turn the "Deck Start/Run Kill" switch to the START position.Note: If the engine is equipped with a prelubrication system, the engine will not start until the cycle for the prelubrication system is finished. 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.
Observe the start-up mode parameter on the Cat