COVER 4D9937 - Caterpillar

Short Circuit Test
Table 1
Troubleshooting Test Steps    Values    Results    
1. Identify Short Circuit
A. Identify the connectors and wire numbers of the suspect circuits (1).
B. Turn off the keyswitch and disconnect switch.
C. Disconnect the component and ECM from the harness.
D. At the harness connector for the ECM, place a multimeter probe on the suspect wire contact.
E. Use the other multimeter probe to check the resistance across all other ECM connector contacts and frame ground.    
≥ 5K Ω    
OK - All resistance is ≥ 5K Ω.
STOP
Not OK - A resistance is < 5 Ω . There is a short between the suspect wire and the low resistance wire (2).
Repair:
Repair or replace the harness.
STOP    
( 1 ) Use the machine Electrical Schematic.
( 2 ) A resistance ≥ 5 Ω but < 5K Ω , indicates a loose or corroded connection. A resistance ≥ 5K Ω indicates an open.