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PGM-FI System
Heated Oxygen Sensor (H02S) Heater (cont'd)
('97
model)
,._._._._._._._._._.-
.
(From page
11-1211
I
I
r
Check for an open or
short
in the
wire
(lG1
line):
Measure
voltage
between the
H02S 4P
connector
terminal
No.
3 (secondary
: NO.
4)
and body
ground.
Repair open or ,hort in the wlr.
"'-
NO
between the No. 15 ALTERNA-
Is there battery voltage?
/
TOR
SP
SENSOR
(7.5
A)
fUM end
I
YES
the H02S (Primary. Secondary-).
I
I
Check for an open in the wire
I
(P02SHTC.
S02SHTC' line):
1.
Turn the
ignition switch
OFF.
I
2.
Reconnect the
H02S
4P con-
I
nector.
I
3. Disconnect
the PCM
connec-
I
tor A (32P).
4.
Tum the
ignition switch ON
(II).
I
5.
Measur
e v
oltage
between
I
PCM
connector
terminals A6
I
and
A10
(AS
and
A1O)·,
I
I
I
Repair
open
in the wire between
I
"'-
YES
Is there 0.' V
or less?
/
the PCM lAG. AS)- and the H02S
I
I
NO
(Primary, Secondary·),
I
Substitute. known-good PCM
and
recheck.
K
symptom/Indica-
tion goes away,
replace
the origi-
nal
peM.
(From
page '1-'21)
r
Check for 8 short In the wire
(P02SHTC. S02SHTC' lino):
1-
Turn the
ignition switch
OFF.
2.
D
i
sconnect
the
peM
con-
nector
A (32P)
.
3. Check for
continuity
between
the PCM
connect
o
r
terminal
I
AS
(AS)· and
body
ground.
I
I
I
I
YES
Repair short in the wire betwHn
I
Is
there
continuity?
/
the PCM (AS. AS-) and the H02S
I
NO
(Primary.
Soc:ondery').
I
I
I
Substitute a known-good
peM
I
and
recheck.
K symptom/indica-
I
tion goes
away.
replace t .... orlgi-
naIPCM.
*:
P0141
PRIMARY H02S (Senior I) 'P CONNECTOR
II)
(Cl
IGI
(BLK/
YEL)
Wire side of
female terminals
SECONDARY H02S
(SENSOR 2) 'P CONNECTOR
1C72W
2
IGI
(BlK/WHT)
3
,
Wire side
of
female terminals
PCM
CONNECTOR A
(32P)
S02SHTC
(BLK/WHT)'
~---{y.
PGl
(BlK)
1 234
5 6
9 10
11
12
151617181920
22 23
24
1
/
/
27
1
/
1
/
/
/
L..
Wire side
of female terminals
S02HTC (BLK/WHn'
P02SHTC (BLK/WHT)
11
12 3
4
5
6 /
/
9 10
11
1121/
/
15
16
17 18 19 20
/
22 23
24
/
1
/
27
,
/
,
/ /
/
L...
0
-
0
L:
.
.
_.
-
_._._._--
-
.
-
.-
~
-
.-.
-.
-.
---
.
-.-
.
-
--
.-
.
-
.
---
.
-
.
-
.
-
.
-
-
-.
-
.
-
.
11-122
I
I
I
I
I
I
I
-.l
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Table of Contents
Troubleshooting
