COUPLING GP-PUMP 4I7360 - Caterpillar

System Operation Description:The engine synchronization switch may exhibit problems due to the following possibilities.
Vessel Wiring
Faulty Switch
Electronic Control Module
Faulty Display Indicator
Illustration 1 g00884187
SchematicTest Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch OFF.
Thoroughly inspect the J3/P3 customer connector, the J1/P1 ECM connector, and the J2/P2 ECM connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the customer connector and the ECM connector that are associated with the engine synchronization switch. Refer to Illustration 1 for pin locations.
Check the J3/P3 customer connector (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).Check the ECM connector J1/P1 and J2/P2 for the proper torque of 2.25 N m (55 lb in).
Check the harness and wiring for abrasions and for pinch points from the battery to the ECM.
Verify that the negative battery connections to the negative battery bus bar are installed properly.Note: All negative battery bus bars must be connected together for proper engine synchronization.Expected Result:All connections have been properly installed and no damage has been observed in the connections or the wiring.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Make the necessary repairs to the connections or the wiring.Verify that the repair eliminates the problem. Stop.Test Step 2. Check the Operation of the Throttle Position Sensor
Remove J3:34 Sync Switch Input 1 and J3:35 Sync Switch Input 2 from the J3 customer connector for the "PORT" ECM and the "STBD" ECM.
Connect Cat ET to the service tool connector.
Turn the keyswitch to the ON position.
Monitor the "Desired Engine Speed" on Cat ET for both engines. Move the throttle from the low idle position to the high idle position while the "Desired Engine Speed" is being monitored.Expected Result:The "Desired Engine Speed" for each engine should move independently of each other.Results:
OK - The "Desired Engine Speed" for both engines changes independently of each other.Repair: Set the "Desired Engine Speed" for each engine within 50 rpm of each other. Proceed to Test Step 3.
Not OK - The "Desired Engine Speed" does not change independently of each other.Repair: Refer to Troubleshooting, "Throttle Position Sensor Circuit - Test" in order to locate the problem and make the necessary repairs.Verify that the repair eliminates the problem. Stop.Test Step 3. Install a Jumper at the Customer Connector and Monitor the "Desired Engine Speed" While the Throttle for the PORT Engine is Moved.
Turn the keyswitch OFF.
Fabricate two jumper wires that will reach from the negative battery bus bar to the J3 customer connector for each engine.
Install a 9W-0844 Connection Socket on one end of each jumper wire and a connector that will connect to the negative battery bus bar on the opposite end of each jumper wire.
Connect one jumper wire from the negative battery bus bar to the pin J3:34 on the PORT connector and connect the other jumper from the negative battery bus bar to the pin J3:35 on the STBD connector. Refer to illustration 1 for pin