COMPRESSOR GP-REFRIGERANT 5077063 - Caterpillar

Table 7
Troubleshooting Test Step Values Results
6. Check the Continuity of the Air Shutoff Switches
A. Ensure that the air shutoff mechanism is in the open position.
B. Disconnect the connector for the suspect air shutoff switch.
C. At the connector for the switch, check for continuity through the switch at the following connector terminals:
a. With the air shutoff mechanism in the OPEN position, a switch in good repair will have continuity between terminals 1 and 2.
A switch in good repair will not have continuity between terminals 2 and 3.
A switch in good repair will not have continuity between terminals 1 and 3.
b. With the air shutoff mechanism in the CLOSED position, a switch in good repair will have continuity between terminals 1 and 3.
A switch in good repair will not have continuity between terminals 1 and 2.
A switch in good repair will not have continuity between terminals 2 and 3.
Place the emergency stop switch in the RUN position.
Turn the battery disconnect switch to the OFF position.
Restore the wiring to the original configuration.
Closed and open circuit
Results: The continuity checks agree with the results that are given. The switches are in good repair. There is a problem in the harness between the ECM and the connectors for the air shutoff switches. There may be a problem with the ECM.
Proceed to Test Step 7
Results: The continuity checks did not agree with the results that are given.
Repair: There is a problem with one of the switches. Replace the suspect switch.