MOUNT-RUBBER 3513847 - Caterpillar

If your application has two engines and one throttle that is designated as the master throttle, measure the resistance between the points that are listed in Table 4. Only perform the measurements that apply to the configuration of your application's throttle controls. Be sure to wiggle the wires between the synchronization switch and the ECM as you make each measurement.
Table 4
Resistance Measurements for a Multiple Engine Configuration With One Throttle that is Designated as a Master Throttle
Engine Master Throttle Position of the Engine Synchronization Switch Terminals Expected Result
Port Port Disabled P1-35 P1-63 Open circuit
P1-44 P1-63 Open circuit
Enabled P1-35 P1-63 Less than ten Ohms
P1-44 P1-63 Open circuit
Center Disabled P1-35 P1-63 Open circuit
P1-44 P1-63 Open circuit
Enabled P1-35 P1-63 Open circuit
P1-44 P1-63 Less than ten Ohms
Starboard Disabled P1-35 P1-63 Open circuit
P1-44 P1-63 Open circuit
Enabled P1-35 P1-63 Open circuit
P1-44 P1-63 Less than ten Ohms
Center Port Disabled P1-35 P1-63 Open circuit
P1-44 P1-63 Open circuit
Enabled P1-35 P1-63 Open circuit
P1-44 P1-63 Less than ten Ohms
Center Disabled P1-35 P1-63 Open circuit
P1-44 P1-63 Open circuit
Enabled P1-35 P1-63 Less than ten Ohms
P1-44 P1-63 Open circuit
Starboard Disabled P1-35 P1-63 Open circuit
P1-44 P1-63 Open circuit
Enabled P1-35 P1-63 Open circuit
P1-44 P1-63 Less than ten Ohms
Starboard Port Disabled P1-35 P1-63 Open circuit
P1-44 P1-63 Open circuit
Enabled P1-35 P1-63 Open circuit
P1-44 P1-63 Less than ten Ohms
Center Disabled P1-35 P1-63 Open circuit
P1-44 P1-63 Open circuit
Enabled P1-35 P1-63 Open circuit
P1-44 P1-63 Less than ten Ohms
Starboard Disabled P1-35 P1-63 Open circuit
P1-44 P1-63 Open circuit
Enabled P1-35 P1-63 Less than ten Ohms
P1-44 P1-63 Open circuit
If your application has two engines and a dedicated master throttle, measure the resistance between the points that are listed in Table 5. Only perform the measurements that apply to the configuration of your application's throttle controls. Be sure to wiggle the wires between the engine synchronization switch and the ECM as you make each measurement.
Table 5
Resistance Measurements for a Multiple Engine Configuration With a Dedicated Master Throttle
Position of the Engine Synchronization Switch Terminals Expected Result
Disabled P1-35 P1-63 Open circuit
P1-44 P1-63 Open circuit
Enabled P1-35 P1-63 Open circuit
P1-44 P1-63 Less than ten Ohms Expected Result:The resistance measurements are correct.Results:
OK - The resistance measurements are correct.Repair: Perform the following procedure:
Connect the J1/P1 connectors.
Attempt to synchronize the engines.
If the engines will not synchronize, there may be a problem with the ECM. It is unlikely that the ECM has failed. Exit this procedure and perform this entire procedure again. If the engines will not synchronize, replace the ECM. Refer to Troubleshooting, "ECM - Replace".Verify that the problem is resolved.STOP
Not OK - At least one resistance measurement is incorrect. There is a problem with the circuit for engine synchronization. There may be a problem with an electrical connector.Repair: Carefully inspect the wiring between the ECM and the Synchronization Switch. Refer to Troubleshooting, "Electrical Connectors - Inspect". Repair the wiring, when possible. Replace parts, if necessary. Verify that the problem is resolved.STOP