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Vehicle Speed Sensor (VSSI
1
P0500
I*',
1
P0501
I*'
The scan tool indicates Diagnostic Trouble Code fOTC)
P0500"'
or
P050l"
':
A
range/perlor-
'97 model:
manee in the Vehicle Speed Sensor (VSS) circu it.
*
1:
AfT
" 2:
MIT
-
The MIL has been reported on.
-
DTC P0501 is stored.
Problem
verification:
,
.
Test
-drive
the vehicle.
PCM CONNECTORS
A 132PI
I
lG1
IBRN/BlKI
2.
Ch
eck
the veh icle speed w ith
the
scan too
l.
111
2
3 4
5
6
/
V
9 10
111
112V
I
Int.mmaut
failure.
system
is
OK
"-
YES
at this
time.
Check
for
poor
con-
Is the
correct speed indicated?
. /
nKtions or loose wires at C129
I
NO
IVSSI.nd
at tho PCM.
Check for 8n open in the
PCM:
,
.
Turn the
ignition switch
OFF.
2.
Block the
rear wheels and set
the
parking brake
.
3.
Jack
up
the front of the vehicle
NOTE:
00
not use
the engine to tu rn the
an
d
supp
o
rt
it
with safety
f
ront wh eels with the rear wheels on the
sta nds.
ground.
Th
e
4WD system
will
engage and
,.
Turn the ignition switch ON
(II).
the ve
hicle will
su
ddenly lurch forward.
5.
Block
the
right front wheel and
sl owly rotate the left front
wheel by hand.
S.
M ea
sure vo
ltage between
PCM connector termina ls C18
and
A9.
Substitute a known-good PCM
0
095 the voltage pulse
0
V
YES
and
recheck.
tf
symptom/indica-
and
5
V
or
ban
ery voltage?
don
goes
away. repface
the
origi-
I
NO
nalPCM.
Check for a short in the PCM:
,
.
Turn the ig
nition switch
OFF.
2.
Di sc
o
nnect the PCM con
·
11
12
necta
r
C (31P).
112V
3.
Turn
the
ignition switch ON
(II ).
,.
Bl
oc
k the right front wh eel
and slowly rotate the left front
w heel.
5.
Measure voltage between PCM
co
nn ect
o
r terminals C1S and
AS.
I
Substitute a known-good PCM
Does the vo
ltage pulse 0
V
YES
and
recheck.
tf
symptom/indica-
and
5
V
or banery voltag
e?
tion goes
away.
replace the
origi-
I
NO
nalPCM.
-
Repair short
in
the wire
between the PCM IC181,
cruise control
unit.
speedo-
meter, and VSS.
-
Repair open
in the
wire
between
the PCM (C1S) and
/
/
151E 171
8
19
2C
V
22
23 24 I
/
27
V
/
/
V
L::::.
C 131PI
11
2
34
567
8V
10
111
1213 14
/
1617 18
/
V V
/
V
/
/
V V
X
V V
/
VSS IBLU/WHTI
I
W
ire side of
female terminals
lG1
IBRN/BlKI
I
3 4
5 6
V
/
9 10
11 I
V
1516 17 1819 20
/
22 23
24
I
V
V
27
V V 1/
/
L::::..
11 2 3 4
5
67
8
L:
!C
111
1213 14
,,-'
16
17
181L
/ /
V
/
V
V
,(
/
X
/
/
1
/
1
VSS IBLU/WIITI
V
Y
the VSS.
-
tf wire is OK, test the VSS (see
fcont'd)
section 231.
11-135
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Troubleshooting
