PLATE 3904329 - Caterpillar

J6/P6 and J7/P7 connectors
Connectors for the 24 VDC power supply
Connectors for the engine control
Check the torque of the allen head screw for the ECM connectors.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the electrical power supply.
Check the harness and wiring for abrasion and for pinch points from the power supply to the master ECM and from the engine control to the master ECM.Expected Result:The connectors, pins, and sockets are connected properly. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results:
OK - The components are in good condition with proper connections. Proceed to Test Step 2.
Not OK - The components are not in good condition and/or at least one connection is improper.Repair: Perform the necessary repairs and/or replace parts, if necessary. Ensure that all of the seals are properly installed. Make sure that the connectors are properly fastened. Verify that the repair has eliminated the problem.STOPTest Step 2. Check the Voltage at the Power Supply, at the Master ECM, and at the Slave ECM.
Make sure that the engine will not crank during this procedure. For an engine with an air starting motor, make sure that the pressurized air supply is OFF. Make sure that the air is purged from the system.Note: If a power supply is used instead of batteries, the minimum voltage for the power supply is 22 VDC. Troubleshoot the power supply if the voltage is less than 22 VDC or more than 29 VDC.
Measure the voltage at the terminals for the power supply. Record the measurement.
Insert two 7X-1710 Multimeter Probes into the harness side of the P1 connector. Insert the first probe into terminal 52. Insert the second probe into terminal 63. Connect a multimeter to the probes.
Switch the 35 amp circuit breaker ON.
Measure the power supply voltage at the P1 connector. During the measurement, wiggle the harness in order to check for an intermittent problem. Be sure to wiggle the harness near each of the connections. Record the measurement.
Switch the 35 amp circuit breaker OFF. Remove the probes from the P1 connector.
Insert two 7X-1710 Multimeter Probes into the harness side of the P3 connector. Insert the first probe into terminal 52. Insert the second probe into terminal 63. Connect a multimeter to the probes.
Switch the 35 amp circuit breaker ON.
Measure the power supply voltage at the P3 connector. During the measurement, wiggle the harness in order to check for an intermittent problem. Be sure to wiggle the harness near each of the connections. Record the measurement.Expected Result:The voltage that is measured at the terminals for the power supply is at least 22 VDC. The voltage that is measured at each connector is within one volt of the voltage that was measured at the terminals for the power supply. The voltage measurements are constant.Results:
OK - Each ECM is receiving the correct voltage.Repair: Perform the following procedure:Switch the 35 amp circuit breaker OFF.Remove the probes from the P3 connector. Proceed to Test Step 3.
Not