ACCUMULATOR GP-HYDRAULIC 1696900 - Caterpillar

Table 1
Points for the Measurement of Resistance for the Left Side of the Engine    
Connector and Terminal     Connector and Terminal    
P1-4 (8 volt supply)     All of the other terminals on the P1 connector    
All of the other terminals on the P2 connector
Engine ground
P2-56 (8 volt supply)     All of the other terminals on the P1 connector    
All of the other terminals on the P2 connector
Engine ground
P2-57 (8 volt supply)     All of the other terminals on the P1 connector    
All of the other terminals on the P2 connector
Engine ground Expected Result:Each check of the resistance is greater than 20,000 Ohms.Results:
OK - Each check of the resistance is greater than 20,000 Ohms. The 8 volt wires and connectors on the left side of the engine do not have a short circuit. Proceed to Test Step 6.
Not OK - At least one check of the resistance is less than 20,000 Ohms. There is a problem with a harness. The problem could be inside the terminal box for the master ECM. Alternatively, the problem could be in the engine's wiring harness.Repair: Repair the harness, when possible. Replace the harness, if necessary. Stop.Test Step 6. Check the Wiring Harnesses on the Right Side of the Engine
Disconnect the P3 connector and the P4 connector for the slave ECM.Note: For the functions of the terminals, refer to Table 1.
Measure the resistance between the terminals that are listed in Table 1.During each measurement, wiggle the harnesses in order to check for an intermittent problem. Be sure to wiggle the wires near each of the connectors.
Table 2
Points for the Measurement of Resistance for the Right Side of the Engine    
Connector and Terminal     Connector and Terminal    
P4-56 (8 volt supply)     All of the other terminals on the P4 connector    
Engine ground
P4-57 (8 volt supply)     All of the other terminals on the P4 connector    
Engine ground Expected Result:Each check of the resistance is greater than 20,000 Ohms.Results:
OK - Each check of the resistance is greater than 20,000 Ohms. The 8 volt wires and connectors on the right side of the engine do not have a short circuit. The problem seems to be resolved. The initial diagnostic code was probably caused by a poor electrical connection.Repair: Reconnect all of the connectors and resume normal operation. Stop.
Not OK - At least one check of the resistance is less than 20,000 Ohms. There is a problem with a harness on the right side of the engine. The problem could be inside the terminal box for the slave ECM. Alternatively, the problem could be with the engine's wiring harness.Repair: Repair the harness, when possible. Replace the harness, if necessary. Stop.