Z-Gl-2 Contents of and Using Electrical Wiring Diagrams
Contents of wiring diagrams
l This document is composed of the 8 groups shown below. The main components are summarized in the
components location diagram at the end of the document.
Tells how to: use and read wiring dragrams, use test
GI General information equipment, check harnesses and connectors, and
locate trouble spots.
Y Ground points Ground routes from and to the battery.
I
w
I Electrical wiring
schematic
I Shows main and other fuses for each system.
lndlvidual systems
I Shows circuit and connector diagrams, component and
connector location diagrams.
1
X
I Common connectors
I Shows connectors common throughout system.
I
JB Joint box diagrams Shows internal circuits and connectors.
PL Parts location Shows location of major electrical parts.
PI Index
I
I
Gives page number of circuit diagram for each
component.
Using wiring diagrams
l The use of the wiring diagram depends on its intended application. Application
For checking
circuits of
individual
systems
For checking
ground circuit
of individual
systems 7-3 Use
II Application
Open to page with circuit diagram and
harness routing to be used and fold out
common connector diagram or joint box
diagram. For checking
fuse
connections Use
Open to electrical wiring schematic.
Open to page with ground point diagram
and fold out common connector diagram
or joint box diagram. For locating
page numbers
of systems and
components Parts Index
H
Open to parts index or system index.
II-GM6 Troubleshooting
Finding short circuits
Shorts occur between the power(positive) and ground(negative) sides of a circuit.
Therefore, finding a shdit circuit requires determining how the circuit is routed.
Circuits not connected to control unit
Examples
Indication
0 Fuse melts. Finding short circuit
0
Test lamp 1. Remove the fuse and
main fuse of the circurt.
2. Disconnect all connectors
of electrical components
in the circuit.
3. Attach a voltmeter or test
lamp to the fuse box and
reconnect each
connector, beginning
nearest the power
source.
4. Check the voltmeter or
see if the test lamp lights
as the connectors are
connected. Finding short circuit
,,{:““o
1. Remove the fuse and main
fuse of the circuit.
2. Disconnect all connectors of
/ electrical components in the
circuit.
Test lamp 3. Attach a voltmeter or test
lamp to the fuse box and
reconnect each connector,
beginning nearest the power
4. Check the voltmeter or see
if the test lamp lights as the
connectors are connected.
Sensor/switch
1. Attach the test lamp or
voltmeter to the CPU
connector.
2. Connect to the swrtch/
sensor connector.
3. Check the voltmeter or see
if the test lamp lights.
A short has occurred where voltmeter
reads OV or the test lamp goes out,
- Short location
Battery Short (A)
l Main fuse melts.
L* Short(B)
0 The motor operates regardless
of whether thermoswitch ON
or OFF when the ignition
switch is ON. Short (C)
lotor
M
P The-
tmo-
switc *The fuse is not melted.
@The main fuse melts when the
ignition switch and thermo-
switch are ON and the relay is
operating. Short (D)
Circuits connected to control unit
-T Examples
Indication
l Fuse melts.
- Short locatior
I
ignition switch
I
Fuse R-l Short (A)
J+L--l
Short (A) l Solenoid A operates normally
when the ignition switch is
ON.
9enold m rfr solenok
;<
A) u a(B) ’ Short (6)
l The CPU transistor burns out
when the ignition switch is
turned ON. Short (C)
l The CPU thinks the switch is
ON because the same
conditions exist as when the
switch is ON.
*The CPU senses the sensor
to be 0 R because the
conditions exist as when
resistance value is 0 R
*The CPU equipped with the
self-diagnosis function output
the malfunctron code. Short (0)
Swltcl1 ml
Short (E) Z-16
