Optima V6-2.7L VIN 4 (2007)
3. TESTING FOR SHORT TO GROUND
A. Disconnect the battery negative terminal.
B. Connect one lead of a self-powered test lamp or an ohmmeter to the fuse terminal on the load side.
C. Connect the other lead to a ground.
D. Beginning near the fuse block move the harness from side to side. Continue this procedure (about six inches apart) while watching the
self-powered test lamp or ohmmeter.
E. When the self-powered test lamp glows, or ohmmeter registers, there is a short to a ground in the wiring near that point.
4. TESTING FOR A SHORT WITH A SHORT FINDER
A. Remove the blown fuse. Leave the battery connected.
B. Connect the short finder across the fuse terminals.
C. Close all switches in series in the circuit that is being testing.
D. Turn on the short circuit locator. It sends pulses of current to the short.
This creates a pulsing magnetic field around the wiring between the fuse box and the short.
E. Beginning at the fuse box, slowly move the short finder along the circuit wiring. The meter will show current pulses through sheet metal and
body trim. As long as the meter is between the fuse and the short, the needle will move with each current pulse. Once the meter is moved past
the point of the short, the needle will stop moving. Check around this area to locate the cause of the short circuit.
Basic Inspection Procedure
BASIC TROUBLESHOOTING
BASIC INSPECTION PROCEDURE
The measured resistance at high temperature after vehicle running may be high or low. So all resistance must be measured at ambient temperature (20°C,
68°F), unless stated otherwise.
NOTE:
The measured resistance at ambient temperature (20°C, 68°F) is the reference value used in specifications and diagnostic procedures.
Sometimes the most difficult case in troubleshooting is when a problem symptom occurs but does not occur again during testing. An example would be if
a problem appears only when the vehicle is cold but has not appeared when warm. In this case, the technician should thoroughly make out a
"CUSTOMER PROBLEM ANALYSIS SHEET" and recreate (simulate) the environment and condition which occurred when the vehicle was having the
