User's Manual

Test For A Short Circuit
Table 20
Troubleshooting Test Steps
Values Results
1. Identify Short Circuit.
A. Identify the connectors and the wire numbers of the
suspect circuits. Use the Electrical System Schematic of
the machine to identify the circuits.
B. Turn the key start switch and the disconnect switch to
OFF.
C. Disconnect the component and the ECM from the
wiring harness.
D. At the machine harness connector for the ECM, place
one of the multimeter probes on the contact of the sus-
pect wire.
E. Use the other multimeter probe to check the resist-
ance across all other contacts in the connectors of the
ECM and frame ground.
The resistance is
greater than 5K Ω
for all the readings.
OK - The harness circuits are correct.
STOP
NOT OK - The resistance is less than 5 Ω. There is a short in
the machine harness. The short is between the suspected wire
and the wire with the lowest resistance measurement.
Repair: Repair or replace the machine harness.
Note: A resistance that is greater than 5 Ω but less than 5K Ω
would indicate a loose connection or a corroded connection in
the circuit. A resistance measurement that is greater than 5K Ω
would indicate an open in the circuit.
STOP
UENR7061 51
Circuit Tests