BEARING-SELF-ALIGNING 2159572 - Caterpillar

System Operation Description:The Electronic Control Module (ECM) receives two signals from the "Deck Start/Run/Kill" switch. A signal is provided to the ECM in order to determine when the "Deck Start/Run/Kill" switch is active.When both of the signals are high, the switch is NOT active.When both of the signals are low, the switch is active.If two different signals are detected during the powerup, the ECM will determine that one of the signals is incorrect. A diagnostic code will be logged and a diagnostic code will remain active.The engine will continue to run when the ECM detects two different signals. If both of the signals are high, the engine will stop.The "Deck Start/Run/Kill" switch is included in the engine start system. Turning the "Deck Start/Run/Kill" switch to the START position energizes the "Start Deck Engine Relay (SDER)". The "Start Deck Engine Relay (SDER)" will be latched in the ON position through a set of normally open contacts. The Start/Run/Stop inputs to the ECM are kept low through a different set of normally open contacts from the "Start Deck Engine Relay (SDER)". The ECM will begin the engine start sequence, when the ECM inputs go low and the engine is not running.Turning the "Deck Start/Run/Kill" switch to the "KILL" position will energize the "Normal Kill Relay (NKR)". A set of normally closed contacts from the "Normal Kill Relay (NKR)" will open de-energizing the "Start Deck Engine Relay (SDER)". The contacts from the "Start Deck Engine Relay (SDER)" will open and the Start/Run/Stop inputs to the ECM will go high. The ECM will begin the engine shutdown when the ECM inputs go high.Note: This test describes the normal starting sequence. The "Deck Engine Control Mode" switch should be in the REMOTE position. The "Deck Engine Control Mode" switch is located on the right side of the "Main Junction Box". Starting the engine with the "Deck Engine Control Mode" switch in the J-Box position bypasses many of the system components. The J-Box position uses the "J-Box Deck Start/Run/Kill" switch to initiate the starting sequence. Contacts from a pair of relays, "Deck Engine Local Power Relay (DLPR)" and "Deck Engine Local Power Relay2 (DLPR2)" are used to isolate the circuit components. Refer to Illustration 1.
Illustration 1 g00857858
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