2-7. GENERAL TROUBLESHOOTING INSTRUCTIONS (CONT)
(3) General Relay Troubleshooting Procedure. The following general relay troubleshooting procedure
applies to most relays that are pushed into a receptacle and do not require any attaching hardware.
(a) Pull relay out of receptacle just enough for the relay terminals to make contact with receptacle
terminals. Leave about 1/4 - 3/8 in. (6.35 - 9.53 mm) space between the relay and the receptacle to insert a
multimeter lead and make contact with the terminal listed in the troubleshooting test.
(b) Perform necessary test.
(4) General Wiring Harness Short Test. The following procedure applies to any wiring harness
suspected of being shorted. Refer to electrical schematics during this procedure.
(a) Connect positive (+) multimeter lead to multimeter VOLT-OHM connector. Connect negative
() multimeter lead to multimeter COM connector. When the multimeter leads are separated or are
measuring a circuit with no continuity, the multimeter will indicate "OL" (Over Limit) on its display. When
multimeter leads are connected together, multimeter should display "0," indicating a continuous circuit with
no (zero) resistance. Wires in a harness that are not purposely joined or connected at a component should not
have continuity (multimeter indicates "OL").
(b) Set multimeter function/range switch to the highest OHM range.
(c) Disconnect harness connector.
(d) Connect positive (+) multimeter lead to harness connector terminal of suspected wire.
(e) Connect negative () multimeter lead to each of the remaining harness connector terminals. If
multimeter does not display "OL," and is displaying a resistance value of zero or higher, this indicates a
continuous circuit. Refer to the electrical schematic before repairing wires or replacing wiring harness to
determine that the wires making a continuous circuit are not purposely joined or are not connected
intentionally at a component.
(f) Disconnect multimeter leads from connector.
(g) Turn off multimeter.
c. Abbreviations and Commonly Used Terms.
gpm = gallons per minute
lbs-ft = foot pounds (torque)
psi = pounds per square inch
vdc = volts direct current
This paragraph covers troubleshooting. Table 2-1 lists faults for the ATLAS. Refer to schematics when
performing test and corrective actions.