PLATE 2975864 - Caterpillar

Thoroughly inspect the following connections:
Electrical connections to each fuse
Connectors for the 24 VDC power supply
Connectors for the engine control switch
Check the torque of the allen head screw for the ECM connectors. The proper torque is 6 1 N m (55 9 lb in).
Illustration 5 g00995688
ECM connectors P1 and P3 (52) Unswitched +Battery (53) Unswitched +Battery (55) Unswitched +Battery (57) Unswitched +Battery (63) -Battery (65) -Battery (67) -Battery (69) -Battery (70) Switched +Battery
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 pinch points from the power supply to the master ECM and from the engine control switch to the master ECM.
Check the harness and wiring for abrasion and pinch points from the master ECM to the slave 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. Stop.Test 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. 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 at 16 amperes. 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.
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.
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.
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