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Alternator (AL
T)
FR Signal
This signals the ECMJPCM when the Alt.rnator
(Al
Tl is
charging.
'97
model:
PCM
CONNECTORS
Inspection
of ALT
FR
Stgnal.
LG1(BRN/BLKI
~
I
11
12 3 4
5 6
/
/
9 10
111
11 2 3 4
5 6 7
8
/
10
A
(l2P)
C (l1P)
Check f
or
8
s
hort in th
e wire
l
fL:::
L'1516i7
181
920/
22
23.
24
J
11
1 12 13
14/
16
1
7 18
/
V
/
/
(ALT F
line):
V
/
27
V
//V
L
V
/
/
V
/
V
/
/
1.
Disconnect the 4P
(3P,"
con-
ALT
F
nector
from
the A LT.
IWIfT/
REDI
2. Turn the igniti
on
switch ON (II
).
3. Meas
ur
e voltage
b
etween
Wire
side
of
fem
ale term
ina ls
peM
connector
terminals e17
C
(31PI
andA9.
Check
fo
r a s
h ort
In
the wi
re
(ALT
F
line):
11
2
3
4
5
6 7
8
/
Ie
1. Turn the ign itio
n switch
OFF.
111
12
1314
IL
161
7 18 1/
/
/
1/
2. Disconnect the negat ive
bat·
"-
NO
tery
ca
ble
from
the banery.
/
/
V
V
/
L L /
Is
there
approx.
5
V?
./
3.
Disconnect PCM connector
C
ALTF
(31P).
IWIfT/RED)
n
YES
4. Check fo
r
continuity between
-
body gro
u
nd and pe
M
con
-
Chee
k
the
operation
of
the
ALl:
nect orterm ina
l
C17
.
1.
Turn the ignit ion switch
OFF.
I
2.
Rec
onnect the A LT 4P
(3P)*
YES
I
connector
to t he A
LT.
Is
there continuity?
"-
Repair short in the wire between
3.
Start
t
he
engine.
Ho
l
d the
./
I
'he PCM
(C17)
and 'he
ALT.
engine at
3,000 rpm
with
no
I
NO
load
(in
Park
or neutral)
unt
il
the
r
adiator fa
n
c
omes on
,
then let
it
idle.
Substitute a know
n·
good PCM
4.
M easure
voltage
betw
een
and rech
ec k.
H p
rescr
ibed v
olt
·
PCM
connector termina
ls
C17
age is
now avail.ble,
replace t
h
e
and
A9.
original
PCM.
1
Does
the voltage
decrease
when
YES
head
lights and rear
defogger
are
L
ALi
FR signal
is
OK.
t
urned
on?
NO
AL T CONNECTOR (C1OS)
lP'
4P
~TF
"
Chad(
for
an
open
In
the
wire
(AL
T
, 2
iWHTJRED)
1
2
3
I
F
line):
3
•
1. Turn the ig niti on switch
OFF.
JUMPER WIRE
JUMPER
ALTF
2. Discon nect
t
he neg
at
ive
bat·
WIRE
(WHT/RED)
tery cable from the
battery.
3
.
Disco nnect PCM
connecto
r
C
(31P).
Wire side of femah! t
erm
inals
,
4. Disco
nnect the
4P
(3P)*
co
n·
nectar from t he
ALT.
PCM CONNECTOR C (l1P)
5.
Connect
the A
LT
4P (3P)*
co n·
nectar terminal
No.
4
(No.
1)*
to
body
ground w ith
a
jumper
wire.
11
2
3
4
5 6 7
8
V
10
6.
Check
for
contin
uity
between
111
12
13 14
/
161
7 18/
V
V
/
body grou
n
d and
PCM
con-
I/
/
/
V
1%
/
V
1
/
/
n
ecto
r terminal C17.
AL
T
F (WHT IRED)
(
"
NO
Repa ir open w
i
r
e
b etween
t
h
e
4
Is t
h
ere
continuity?
/'
PCM (C I7) and
'he
ALT.
YES
Wire side of female terminals
See
the
ALi
inspection
(see
sec·
I
(cont'd)
tion
231
.
*:Cana da
11-159
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