77
Electrical System
The electrical connections should be checked periodi-
cally for proper function.
TESTING ELECTRICAL COMPONENTS
All electrical tests should be made using the Dealer Diag-
nostic System or the Fluke Model 77 Multimeter. The
Dealer Diagnostic System can return data for certain
components which are identified at the beginning of their
respective sub-section. If any other type of meter is used,
readings may vary due to internal circuitry. When trou-
bleshooting a specific component, always verify first that
the fuse(s) are good, that the LED(s) are good, that the
connections are clean and tight, that the battery is fully
charged, and that all appropriate switches are activated.
USING DEALER DIAGNOSTIC SYSTEM
NOTE: Refer to the user guide for additional infor-
mation.
1. Open software.
2. Locate vehicle diagnostic plug.
OHA155
3. Connect diagnostic tool to vehicle diagnostic plug
and identify vehicle.
OHA156
4. Click on sensor data applicable to sub-section.
OHA157
NOTE: For absolute accuracy, all tests should be
made at room temperature of 68° F (20° C).
NOTE: Certain components and sensors can be
checked by using the EFI diagnostic system and LCD
indicator (see EFI Diagnostic System in this section
for more information).
SPECIAL TOOLS
A number of special tools must be available to the techni-
cian when performing service procedures in this section.
Refer to the current Special Tool Catalog for the appro-
priate tool description.
NOTE: When indicated for use, each special tool
will be identified by its specific name, as shown in the
chart below, and capitalized.
NOTE: Special tools are available from the Service
Department.
Battery
NOTE: Preliminary checks may be performed on
this component using the diagnostic mode on the LCD
gauge (see EFI Diagnostic System in this section).
After being in service, batteries require regular cleaning
and recharging in order to deliver peak performance and
maximum service life. The following procedure is rec-
ommended for cleaning and maintaining a sealed battery.
Always read and follow instructions provided with bat-
tery chargers and battery products.
NOTE: Refer to all warnings and cautions provided
with the battery or battery maintainer/charger.
Description p/n
Diagnostic Harness
0486-219
Fluke Model 77 Multimeter
Common Tool
Fuel Pressure Tester
0644-587
MaxiClips
Common Tool
Tachometer
Common Tool
Timing Light
Common Tool
Component data can be retrieved using the Dealer
Diagnostic System. Utilize the Sensor Data screen.
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