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PGM-FI System
Crankshaft Position/Top Dead Center/Cylinder Position (CKP/TDC/CYP)
Sensor (cont'd)
{From page
11 -1311
I
Check for a
short
in the CKPI
TOC/CYP
sensor:
Check
fo
r
co
ntinuity to body
grou
nd on
both
terminals of the
ind
icated
sensor individually (see
ta
ble on
page
1' -131
).
I
Is
th
ere con
t
inuity?
I
NO
Check
for
an open in the wires
ICKP/TDC/CYP
lines):
1.
Reconnect the
distributor
lOP
co
nnector.
2.
Disconnect PCM connector C
131P).
3.
Measure
resistance
between
the terminals
of
the
indicated
se
ns
or
on
the
PCM
connector
(see
table
on page 11 -131
l.
I
Is there
350
- 700
fl?
I
YES
Check for a short in the wires
ICKP/TOC/CYP lin ..
):
Check
f
or co ntinuity
between
body ground and
PCM connector
terminals C2.
C3
and/or
C4 individ-
ually.
I
YES
NO
IS
there
continuity?
-....
YES
/
I
NO
Substitute a known-good PCM,
and
recheck. If
symptom/indica-
tion goes
away,
replace the origi-
nal PCM
.
11-132
DISTRIBUTOR
lOP
CONNECTOR IC121)
CKPP
IBlU)
TDCP IGRN)
Replace the distributor ignition
I
housing (see
section
.).
Repair open in the indicated sen-
sor wires (see table on page ,,-
131).
Q
-
CYP P IYEl)
~
hi
11
21 31
fs-5lTl
1
0'
_,_I
'1
8
:
9
10
Q
-
CYPM
IWHT)
IBlK)
",.
~
Q
~
Q
TDCM
IRED)
-
Term
inal
side
of
male termina ls
PCM CONNECTORS C 131P)
Q
-
CKP P
TOC
P
CYP P
IBlU)
'~7)
)
YEL)
I
11
23'
4
5
1617
8
V'
H
0>'
Q
Q
1111213i4
/
1611 7118
/
/
V
V
L~~E '% ~IA!]
.,"\
I
/ :/, /
V
I/I/
,---------------,
CKPM
IWHT)
TDC M CYPM
Repair
short
in the indicated sen-
sor wires (see table on page
11-
131).
IRED)
IBlK)
Wire
side o
f
fem
ale
terminals
CKP P
TOC P
CYP P
IBlU)
IGRNI
IYEl)
,------'-1,
1
/
./
5 6
7
8
161718
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Troubleshooting
