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Charging System
Troubleshooting (cont'd)
'97 model: Alternator Control System Test
(U.S.A.
model)
NOTE:
Befo re testing,
ch
eck
proper operation of
the
ELD
by
checkin
g
for
a
DTe
(see
secti on
11).
Check for a short in the circuit
tAL TC
line):
1.
Disconn
ect the
4P
connector
from
t he alternator.
2. Start
th
e
eng
ine, and
turn
the
headlights (hig
h
bea
m
)
ON
.
3.
Mea
sure voltage between the
4P
connecto
r
te
rminal
No.2
and
the po sit
ive t
erm
i
na
l of
the battery.
"-
YES
Is
there 1 V or less?
/
NO
Check for a short in the w ire
fAlTC
line):
1.
Turn
the
headli
g
ht and
ign
j·
tio
n
switch OFF.
2.
Discon
nect
the
32P connector
fro
m the ECM/PCM.
3.
Check for continuity between
the ECM/PCM
32
P co
nnector
te
rmi
na
l No
.
3
0 and b
o
d
y
ground
.
"
NO
Is there
conti
nuity?
/
YES
Repair short in the wire between
the alternator and the ECM/PCM
.
4-26
CAUTION
:
Be sure to use
III
voltmeter
with
its positive
terminal connected to
battery positive and its negative
termi·
nal to the 4P connector terminal
No.
2.
BATTERY
+
V
C
IWHT/GRNI
..-"?
W ire side of
1
2
ALTERNATO
...
female terminals
3
4
R
OR
4PCONNECT
~~
ECM/PCM CONNECTOR A 132PI
L
V
3
4
5
6V
8
I
V
10
l/
V
V
l '
1
/
16 17 18 19 20 21
V
23 2
4
k"
26
21
28
29
30
V
32
.
.
~~
L -
Wi re
Side of
ALTC
Check for
8n
open In the wire
fema le termi nals
(WHT/GRN)
IALTC
line):
n
.
1.
Tu
rn th
e hea dlight
and
ig
ni
-
tion
switch OFF.
~~-,
2.
Disco
nnect the
32P
con
nector
' ro
m
the
ECM/PCM.
Wire side of
3.
Check for
conti
nuity
between
fe
male
terminals
3
4
th
e
ECM/PCM 32
P
con
nector
terminal
No.
30
and altern
ator
ALTERNATOR
4P connector
term
inal
No.2.
4P CONNECTOR
Is there
continu
ity?
"
NO
I
Repair open in the wire between
J
./
I
the alternator and
ECM/PCM.
YES
Tast and rapa lr tha alternator
components.
ECM/PCM CONNECTOR A
132PI
V
I
V
3
4
5
6
/
8
lL
10
/
V
V
14
/
16 11
18 19 20 21
I
v
23 2 4
V
26 21
28 29
30
I
V
32
L -
Wire
side
of
ALTC
female
termin
als
IWHT/GRNI
Substitute. known -good ECMI
n
PCM.
and
recheck.
If prescribed vottage
is
now avail-
able.
replace the origI nal ECMI
PCM
.
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Troubleshooting
