BEARING 6S3435 - Caterpillar

Short circuit - An electrical circuit failure resulting in undesired current, usually a circuit bypass across a load.For example: a short across the circuit wires for a lamp produces too much current in the wires, but no current to the lamp. The lamp circuit is shorted.Note: Normal circuit resistance can vary, but the resistance between a particular circuit and other unrelated circuits is always ≥ 5K Ω.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 the key start switch and battery disconnect switch to the OFF position. Wait for the DEF warning lamp to go out before proceeding.
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.
All resistance ≥ 5K Ω. OK - All resistance is correct.
STOP
NOT OK - A resistance is < 5 Ω . There is a short between the suspect wire and the low resistance wire.
Repair: Repair or replace the harness.(2)
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.