AMC Jeep ET-501 User manual
FI
AMC!
Jeep
CEC
FUEL
FEEDBACK
SYSTEM
TESTER
ET-501
INSTRUCTION
MANUAL
»
>
i
"1
FOREWORD
This
Instruction
Manual
fully
describes
the
operation
of
the
C.E.C.
Fuel
Feedback
System
Tester
(ET-501);
j
explaining
its
function
of
analyzing
the
output
generated
by
the
sensors
which
are
part
of
the
Com-
1
puterized
Emission
Control
(CEC)
System
on
AMC
and
Jeep
6-cylinder
and
4-cylinder
engines
manufac¬
tured
from
1981
through
1984
with
this
system.
'
•
'
'
;
•:
.
/'.
-I
Partitioned
into
five
section^,
this
Instruction
Manual
is
conveniently
organized
with
handy
divider
tabs
'
,
■■
]
to
insure
the
quick
and
easy
locating
of
information.
•
.
;*jj
;
,
-J
The
General
Information
section
highlights
the
Tester’s
description,
design
features,
and
replaceable
parts,
as
well
as
explaining
the
operation
of
the
CEC
Fuel
Feedback
System’s
open-
and
closed-loop
}
modes.
A
listing
of
the
definitions
of
the
abbreviated
response
displays
is
also
included
to
aid
you.
in
readily
understanding
them.
*
.
-
.
Flow
charts
for
both
the
©-cylinder
and
4-cylinder
engines
have
been
divided
into
their
respective
sections
in
addition
to
a
unit
being
devoted
to
diagnostic
schematic
drawings.
In
this
section
you’ll
find
informa-
i
tion
on
the
new
diagnostic
connectors
and
microprocessing
unit
(MCU)
pin
connectors
found,
on
our
•
\i
1983-1984
vehicles.
Throughout
the
various
{low
charts,
we
have
made
use
of
the
following
two
symbols:
*
j
‘
_
•
•
*
.
.
_
i..'
•
.
;
.
>=
greater
than
.
•
'*
,
■
•
••.•*
*
..
«
•
*
•
<=
Less
than.
.
'•
'
•
■
'.
•
.
..
•'*'
'
‘
•
••
•
'
’
_
'
For
example,
the
instructions;-‘‘<1.5”
should
be
understood
to
mean
“folfow
the-path
marked
‘<1.5,’
if
-
the
reading
after
the
test
is
less
than
.1.5.”
For
a
reading
g/eater
than
1.5,
you
should
follow
the
path
marked
“>1.5.”
v.
‘
•
''
■
•
*
'
'
•
'
?
.
•
The
fifth
section,
Bulletins;
has-been
set
aside
to
assist
you
in
keeping
this
Instruction
Manual
current.
Any
information
subsequently
issued
by
AMC/Je'ep
Or
the
Tester’s
manufacturer
should
be
placed
in
this
section,
Be
sure
to
either
remove
out-dated
information
or
mark
the-revisions
and
their
effective
dates
on
any
information
which
remains
jn
thiS'manuart.
..
'•
.
r
-'vv
.
•/
....
;
.
.
Use
of
the
information
contained
in
this
Instruction
Manual
will
enable
you
to
professionally
service
the
CEC
Fuel
Feedback
System
with
the
ET-501
Tester.
Any
questions
regarding
information
not
covered
here
should
be
submitted
to
yoUr
2fone'bffice
or
to.the
Tester’s
manufacturer.
-
NOTE:
The
material
contained
in
ihis
-editjon
of
the
CEC
Fuel
Feedback
System
Tester
Instruction
,
Manual
supersedes
any
and
allpre.ViQuSly
released
Instruction
Manuals..
*
•
’
SAFETY
PRECAUTIONS
This
unit
should
be
used
only
by
a
qualified
technician
knowledgeable
in
the
handling
of
this
type
of
equipment.
Do
not
run
engine
in
a
confined
area
or
garage
when
performing
tests.
Use
adequate
shop
ex¬
haust
ventilation
system
to
prevent
carbon
monoxide
poisoning.
Exposing
tester
or
tester
wires
to
hot
or
moving
engine
components
may
result
in
PERSONAL
INJURY
and/or
tester
damage.
Do
not
run
hook-up
leads
over
the
engine
fan,
pump,
or
belt
areas.
Route
leads
outside
of
engine
compartment.
•
Securely
set
the
emergency
brake,
parking
brake,
and
block
the
wheels
before
performing
tests
or
maintenance
on
engine.
•
Check
to
insure
that
the
hood
support
rod
is
fully
engaged
or
that
the
spring
assisted
hood
lift
is
capable
of
supporting
the
hood
in
the
position
it
is
placed
in.
•
Wear
approved
eye
protection
when
working
near
the
engine
or
battery.
•
Keep
lighted
cigarettes,
sparks,
flames
or
other
ignition
sources
away
from
battery
and
fuel
vapors
at
all
times.
•
Do
not
lay
tools
or
equipment
on
battery.
Accidentally
grounding
the
“hot”
battery
terminal
can
shock
or
burn
you
and
damage
wiring,
battery
and
tools
or
tester.
•
When
connecting
battery
test
leads,
be
careful
to
avoid
sparks
which
could
cause
the
battery
to
explode.
•
Avoid
contact
with
hot
surfaces
such
as
exhaust
manifolds
and
pipes,
radiator
and
hoses,
etc.
•
Remove
tools
from
vehicle
before
starting
engine.
Tools
can
shake
off,
fall
into
fan
blades
and
drive
pulleys,
and
be
propelled
into
the
air,
which
could
result
in
property
damage
and/or
injury.
•
Keep
out
of
a
direct
line
with
fan
blades
when
testing.
i
WARRANTY
t
THIS
WARRANTY
IS
EXPRESSLY
LIMITED
TO
PERSONS
WHO
PURCHASE
OTC
PRODUCTS
FOR
PUR¬
POSES
OP
RESALE
OR
USE
IN
THE
ORDINARY
COURSE
OF
THE
BUYER’S
BUSINESS.
This
Owatonna
Tool
Company
electronic
product
is
warranted
against
defects
in
materials
and
workman¬
ship
for
1
year
(12
months)
from
date
of
delivery
to
the
user.
This
warranty
does
not
cover
any
part
that
has
been
abused,
altered,
used
for
a
purpose
other
than
that
for
which
it
was
intended,
or
used
in
a
manner
in¬
consistent
with
instructions
regarding
use.
The
exclusive
remedy
for
any
electronic
tester
found
to
be
defective
is
repair
or
replacement,
and
OTC
shall
not
be
liable
for
any
consequential
or
incidental
damages.
Final
determination
of
defects
shall
be
made
by
OTC
in
accordance
with
procedures
estab¬
lished
by
OTC.
No
agent,
employee
or
representative
of
OTC
has
any
authority
to
bind
OTC
to
any
affirma¬
tion,
representation
or
warranty
concerning
OTC
electronic
testers,
except
as
stated
herein.
DISCLAIMER
THE
ABOVE
WARRANTY
IS
IN
LIEU
OF
ANY
OTHER
WARRANTY,
EXPRESSED
OR
IMPLIED
INCLUDING
ANY
WARRANTY
OF
MERCHANTABILITY
OR
FITNESS
FOR
A
PARTICULAR
PURPOSE.
REPAIR
SERVICE
AVAILABLE
The
manufacturer
will
repair
and
return
to
the
purchaser
any
unit
after
expiration
of
the
warranty
for
a
nominal
service
and
freight
charge.
Return
the
unit
prepaid
to:
•
•
•
Owatonna
Tool
Company
OwatonnS,
MN
55060
Attni'Service
Repair
Dept.
TABLE
OF
CONTENTS
GENERAL
INFORMATION
Description
.....1
Design
Features.1
Replaceable
Parts..
'..2
CEC
Fuel
Feedback
System
Operation.3
Operating
Instructions.,..3
Definition
of
Tester
Displays.6
6-CYLINDER
frJLl
/
DOUIMTEST
—
Perform
Electronic
Ignition
Retard
Test.2
CKGND
+
PWR
FEED
Test
for
81-82.3
CK
GND
+
PWR
FEED
Test
for
83-84.4
CK
RPM
SIGNAL
Test
for
81-82.5
CK
RPM
SIGNAL
Test
for
83-84:..7
CK
IDLE
CKT
Test
for
82....9
CK
IDLE
CKT
Test
for
83-84.
1
1
CK
CSW
CKT
Test
for
81....13
CKCSWCKT
Test
for
82.
1
5
CK
CSW
CKT
Test
for
83-84..16
CK
AIR
MGMTSYS
Test
for81-82.17
CK
AIR
MGMTSYS
Test
for
83-84.19
CK
TES
CKT
Test
for
81...’.23
CK
TES
CKT
Test
for
82...25
CK
TES
CKT
Test
for
83-84....27
CK
ALT
CKT
Test
for
81
-82*.....29
CK
ALT
CKT
Test
for
83-84.
30
CK
VSA
Test
for
81.;....31
CK
VSA
Test
for
82-83-84..7...*.
35
CK
STP
MOT
Test
for
81-82.:.,....37
CK
STP
MOT
Test
for
83-84......‘.39
CK
PCV
SYS
Test
for
83-84.
;
.
.
.
.
.
41
CK
OPSW
+
CHOKE
Test
for
82-83-84.:..42
CK
WOT
CKT
Test
for
81.
.
.
.
.
.
.
.
.
.
.
.43
CK
WOT
CKT
Test
for
82....7......44
CK
WOT
CKT
Test
for
83-84..
....7..
.•...7
...45
DO
CLD
LOOP
TEST
Test
for
81....*...46.
DO
CLD
LOOP
TEST
Test
for
82...7.I7.47
DO
CLD
LOOP
TEST
Test
for
83-84
7
.7
7.....'.....48
RP
...
OVER
LEAN
Test
for
81-82-83-84...!
.
.
49
RP
...
OVER
RICH
Test
for
81-82-83-84.......:.50
4-CYLINDER
/
•
;
RP
VSA
Test
for
83-84.
......
7
_v..'.....
7
....
.2
CKGND
+
PWR
FEED
T.est
for
83-84..:....
7.2
CK
RPM
SIGNAL
Test
for
83-84......
....
.V
.2
CK
AIR
MGMT
SYS
Test
for
83-84.
7
‘
....2
CK
CSW
CKT
Test
for
83-84.7
.:..
.
.
....2
CK
ALT
CKT
Test
for
83-84....
..2
CK
TES
CKT
Test
for
83-84.:
7;.!
_
_
__
_
_
:......2
CK
VSA
Test
for
82-83-64
..
7
.
.
.
.
.
.
.
.
2
DO
CLD
LOOP
TEST
Test
for
83^84.7
7.....2
)
TABLE
OF
CONTENTS
(Cont’d)
4-CYLINDER
(CONT’D)
CK
INPUT
CKTS
Test
for
83-84.;.2
CKCTS
+
CHOKE
Test
for
83-84.......3
CK
KNOCK
CKT
Test
for
83-84.4
CK
WOT
CKT
Test
for
83-84.
:
..
.
*..5
NO
DC
SOL
Test
for
83-84.6
CK
CHOKE
+
FEED
Test
for
83-84..
7
CK
CTS/WOT
CKT
Test
for
83-84...9
CK
IDLE
CKT
Test
for
83-84.11
RP
PCV
SOL
Test
for
83-84.I.13
RP
...
OVER
LEAN
Test
for
83-84.
'..15
RP
...
OVER
RICH
Test
for
83-84.;.16
CK
AC
CUT-OUT
Test
for
85
w/AC
and
Automatic
Transmission
.
.
.
1
7
SCHEMATICS
1981
6-Cylinder
Vehicle
Schematic...
1981
Diagnostic
Connectors.'..
1982
6-Cylinder
Vehicle
Schematic.....
1982
6-Cylinder
CEC
System
Schematic.
1982
6-Cylinder
Diagnostic
Connectors.
1983-84
6-Cylinder
Vehicle
Schematic.
1983-84
6-Cylinder
Diagnostic
Connectors.
1983-84
6-Cylinder
Harness
Connectors
at
MCU..
1983-84
AMC
4-Cylinder
CEC
System.
1983-84
AMC
4-Cylinder
Engine
Diagnostic
Connectors.
1984
Jeep
4-Cylinder
Pin
and
Socket
Connector.
1984
Jeep
Microprocessor
Control
Unit
(MCU)
Pin
Connectors
Diagnostic
Connectors.
1985
Jeep
4-Cylinder
Pin
and
Socket
Connectors.
1985
Jeep
Microprocessor
Control
Unit
(MCU)
Pin
Connectors
..2
..2
..3
..3
;.3
5
.8
.9
.9
10
11
Date:
9/84
/
*
General
Information
GENERAL
INFORMATION
General
Information
DESCRIPTION
The
AMC/Jeep
Fuel
Feedback
System
Tester
is
a
microprocessor
based
service
tool
that
will
rapidly
scan
the
various
circuits
utilized
by
the
Computerized
Emission
Control
(CEC)
System
on
AMC/Jeep
6-cylinder
and
4-cylinder
engines.
The
tester
will
direct
the
service
technician
through
a
series
of
steps
that
will
allow
the
tester
to
verify
if
circuit
voltages
generated
by
components
that
make
up
the
CEC
system
are
operating
within
tolerance.
In
minutes,
the
tester
will
have
systematically
checked
the
equivalent
of
ap¬
proximately
40
pages
of
service
manual
procedures
and
flow
charts
that
would
normally
be
checked
manually
by
a
service
technician.
These
complete
systematic
checks
are
directed
by
software
memory
modules
installed
by
the
operator
into
the
tester.
The
memory
modules
have
a
memory
capacity
that
will
store
up
to
32,000
bits
of
informa¬
tion;
enough
to
handle
the
AMC
and
Jeep
6-cylinder
engines
for
1981-1984
and
enough
to
handle
the
AMC
and
Jeep
4-cylinder
engines
for
1983
and
1984.
The
memory
module
is
designed
to
be
removable.
The
6-cylinder
module
must
be
installed
when
testing
a
6-cylinder
system.
The
4-cylinder
module
is
used
with
the
4-cylinder
system.
Be
sure
to
check
the
module
being
used
periodically
to
see
that
it
is
firmly
seated;
especially
if
the
tester
unit
has
been
dropped
or
mishandled.
DESIGN
FEATURES
A
16
CHARACTER
DISPLAY
WINDOW
will
display
data
and
direct
the
service
technician
to
the
necessary
steps
needed
to
test
the
CEC
system.
TOUCH/RESPONSE
PADS
located
on
the
face
of
the
tester
will
enter
a
response
when
touched
by
the
ser¬
vice
technician.
5
CONNECTOR
CABLES
are
provided
with
the
CEC
tester.
Two
cables
are
designed
to
interface
with
vehicle
diagnostic
connectors.
The
remaining
cables
will
interface
with
a
designated
vehicle
model
year
micro
computer
control
unit
(MCU).
General
Information
1
General
Information
REPLACEABLE
PARTS
ITEM
PART
NUMBER
Operator’s
Instruction
Manual
(Not
Shown).8981
320
761
Software
Module
Unit
Assembly
(6-cyl.).;.8981
320
762
Software
Module
Unit
Assembly
(4-cyl.).8981
320
763
Test
Harness
1
(For
1981
6-cyl.).8981
320
764
Test
Harness
2
(For
1981
6-cyl.).8981
320
765
Test
Harness
3
(For
1982-1984
6-cyl.
and
1983-1984
4-cyl.).8981
320
766
Test
Harness
4
(For
1982
6-cyl.).8981
320
767
Test
Harness
5
(For
1983-1984
6
&
4-cyl.).8981
320
768
Storage
Box.8981
320
769
Insert..8981
320
770
Adapter.
8981
320
771
2
General
Information
CEC
FUEL
FEEDBACK
SYSTEM
OPERATION
There
are
two
primary
modes
of
operation
for
the
CEC
Fuel
Feedback
System:
•
open
loop
•
closed
loop
OPEN
LOOP
In
the
open
loop
mode,
the
system
delivers
only
pre-determined
air/fuel
mixtures
and
ignores
the
make-up
of
exhaust
gases.
The
MCU
does
not
have
the
ability
to
vary
the
air/fuel
ratio
except
as
pre-programmed
for
certain
engine
operating
conditions.
The
CEC
System
will
be
in
the
open
loop
mode
of
operation
whenever
engine
operating
conditions
do
not
conform
with
the
programmed
criteria
for
closed
loop
operation.
The
air/fuel
mixture
is
maintained
at
a
programmed
ratio
that
is
dependent
on
the
type
of
engine
operation
involved.
The
oxygen
sensor
data
is
not
accepted
by
the
CEC
System
during
this
mode
of
operation.
The
following
conditions
involve
open
loop
operation.
•
Engine
Start-Up
•
Coolant
or
Air
Temperature
Too
Low
•
Oxygen
Sensor
Temperature
Too
Low
•
Idle
or
Engine
Deceleration
•
Wide
Open
Throttle
(WOT)
•
Battery
Voltage
Too
Low
CLOSED
LOOP
In
the
closed
loop
mode,
the
system
varies
the
air/fuel
ratio
in
response
to
the
amount
of
oxygen
in
the
ex¬
haust
gas.
The
MCU
receives
input
signals
from
the
Fuel
Feedback
System
components
and
can
adjust
the
air/fuel
ratio
by
signaling
the
various
system
outputs.
When
all
input
data
conforms
with
the
programmed
criteria
for
closed
loop
operation,
the
oxygen
content
output
voltage
from
the
oxygen
sensor
is
accepted
by
the
microprocessor.
This
results
in
an
air/fuel
mix¬
ture
that
will
be
optimum
for
current
engine
operating
conditions.
NOTE:
The
AMC
CEC
Fuel
Feedback
System
Tester
is
designed
to
analyze
the
output
generated
by
the
sensors
that
are
part
of
the
emission
control
system
in
both
the
open
loop
and
the
closed
loop
mode
of
operation.
OPERATING
INSTRUCTIONS
1.
Connect
the
red
positive
(
+
)
power
lead
cable
of
the
tester
unit
to
the
positive
side
of
the
battery.
Connect
the
black
negative
(-)
lead
cable
to
the
ground
side
of
the
battery.
CAUTION:
The
positive
and
negative
lead
cables
of
the
tester
unit
must
be
connected
first;
before
another
connection
is
made.
Failure
to
do
this
could
result
in
damage
to
the
tester
unit.
2.
Upon
completion
of
the
battery
connections,
the
6-cylinder
module
will
display
a
request
for
model
year
of
the
test
vehicle.
The
4-cylinder
module
will
display
an
inquiry;
is
the
test
vehicle
a
U.S.
or
Canadian
version?
The
service
technician
must
press
the
correct
touch
pad
to
indicate
a
response
to
the
displays.
General
Information
3
General
Informatioi
Operating
Instructions
(Continued)
PRESS
TO
ANSWER
83
PRESS
TO
ANSWER
84
6-CYLINDER
PRESS
TO
ANSWER
U.S.A.
PRESS
TO
ANSWER
CANADIAN
ADAPTER
\
ADAPTER
4-CYLINDER
NOTE:
If
a
wrong
response
is
entered
during
the
request
for
vehicle
information,
the
tester
must
be
disconnected
from
the
battery.
The
tester
will
automatically
reset
itself.
The
tester
will
repeat
a
request
if
the
information
requested
was
not
received.
Enter
the
proper
response
and
the
tester
will
continue
with
the
test
procedure.
After
the
correct
vehicle
information
has
been
entered,
the
tester
will
request
the
connection
of
the
appropriate
numbered
test
harness
to
the
diagnostic
connector
of
the
vehicle.
Refer
to
location
chart.
1981
CJ
1981
Spirit/Concord
1982
J
&
CJ
1982
Spirit/Concord/
Eagle
1983
J
&
CJ
1983
Spirit/Concord/
Eagle
1984
J,
CJ
&
XJ
1984
Eagle
Diagnostic
Connectors)
Location
Engine
Compartment
Under
Dash
Engine
Compartment
Engine
Compartment
Engine
Compartment
Engine
Compartment
Engine
Compartment
Engine
Compartment
Micro
Computer
Unit
(MCU)
Location
Engine
Compartment
Under
Dash
Behind
Right-Hand
Kick
Panel
Engine
Compartment
Under
Dash
Behind
Right-Hand
Kick
Panel
Under
Dash
Under
Dash
Behind
Right-Hand
Kick
Panel
Under
Dash
Under
Dash
Behind
Right-Hand
Kick
Panel
NOTE:
If
the
tester
does
not
respond
after
the
appropriate
numbered
test
harness
has
been
con¬
nected,
the
adapter
must
be
affixed
to
the
tester
unit.
The
tester
will
not
respond
to
the
revised
software
program
unless
the
adapter
is
permanently
attached
to
the
tester.
The
tester
will
direct
the
technician
through
the
diagnostic
testing
procedure.
Information
or
re¬
quests
will
be
shown
on
the
tester
display.
When
a
request
is
made
by
the
tester,
the
technician
must
respond
by
pressing
the
appropriate
touch
pad
(membrane
key)
to
indicate
a
response.
The
touch
pads
can
also
be
used
to
indicate
a
YES
or
NO
response.
‘i
4
General
Information
Operating
Instructions
(Continued)
5.
D
uring
the
testing
procedure
the
tester
will,
at
some
point,
instruct
the
technician
to
connect
a
numbered
test
harness
to
the
micro
computer
unit
(MCU)
if
a
fault
is
detected
or
as
a
diagnostic
check
of
the
MCU.
Refer
to
location
chart.
1982
1981
v
j)
1981
s
13
\
4
v--
~f/\
;
||
1
1983
&
1984
Y\
^
TTv
®
•/
lWpf\
1982,
1983
&
1984
\\
I)
Jy
TEST
HARNESS
CONNECTORS
FOR
TEST
HARNESS
CONNECTORS
DIAGNOSTIC
CONNECTORS
MICRO
COMPUTER
6.
When
all
connections
are
properly
made,
the
tester
will
continue
through
the
testing
procedure.
IMPORTANT:
All
resistance
tests
must
be
performed
with
the
ignition
switch
off.
Always
discon¬
nect
the
diagnostic
harness
from
the
tester
before
disconnecting
the
battery
cables.
NOTE:
Information,
questions,
or
requests
to
perform
an
operational
step
will
be
communicated
through
the
tester’s
display.
When
a
question
is
displayed,
the
service
technician
must
respond
by
pressing
the
touch
pad
under
the
appropriate
answer
as
it
appears
on
the
display.
If
a
fault
is
indicated
by
the
tester,
verify
and
reverify
with
the
tester
before
proceeding
with
a
repair
of
the
component.
During
the
testing
procedure
if
a
component
fault
is
indicated
(e.g.
CK
CSW
CKT),
the
service
technician
will
check
that
component
fault
with
the
procedure
specified
in
this
Instruction
Manual,
repair
or
replace
if
faulty,
and
verify
repair
with
the
tester.
If
no
fault
is
found,
refer
to
the
technical
service
manual
for
detailed
troubleshooting.
7.
If
an
operation
requested
by
the
tester
has
been
performed
and
the
tester
continues
to
display
the
same
message,
indicate
the
operation
has
been
completed
by
pressing
the
YES
(left)
touch
pad.
This
is
usually
a
symptom
of
a
fault,
as
the
tester
has
not
seen
any
indication
from
the
vehicle
that
the
operation
has
been
completed.
8.
When
the
tester
has
completed
the
CEC
FFB
System
testing,
the
tester
will
display
“PASS
TEST.”
General
Information
5
General
Information
DEFINITION
OF
TESTER
DISPLAYS
Due
to
the
limited
amount
of
space
on
the
tester
display,
many
of
the
test
requests
and
messages
are
ab¬
breviated
to
short
form
statements
by
means
of
key
words
or
letters
to
represent
a
longer
statement.
The
complete
statements
are
defined
in
the
following
listing.
KEY
ON
—
Turn
the
ignition
key
to
the
ON
position.
,
CK
GND
+
PWR
FEED
—
Check
the
system
ground
and
power
source.
NO
D.C.
SOL
—
No
duty
cycle
pulses
—
check
the
duty
cycle
line.
START
VEH
—
Start
engine.
GK
RPM
SIGNAL
—
Check
RPM
(tach)
wire
with
the
engine
off.
TESTING
—
Tester
is
testing.
CK
INPUT
CKTS
—
Check
the
six
input
circuits.
CK
IDLE
CKT
—
Check
the
idle
circuit.
TURN
KEY
OFF
—
Turn
the
ignition
key
to
the
OFF
position.
RP
PCV
SOL
—
Repair
the
positive
crankcase
ventilating
solenoid.
RAP
MANIFOLD
—
Tap
on
the
manifold
with
a
screwdriver
to
simulate
an
engine
knock.
CK
KNOCK
CKT
—
Check
the
knock
circuit.
DIS
VSA
—
Disconnect
the
vacuum
switch
assembly.
RP
VSA
—
Repair
the
vacuum
switch
assembly.
YES
OK?
NO
—
A
yes
or
no
response
is
needed
for
the
previous
display.
FLOOR
IT
ONCE
—
Push
accelerator
pedal
to
the
wide-open
throttle
position
and
release
immediately.
LET
IDLE
—
Lift
foot
from
accelerator
and
let
the
engine
idle.
PASS
TEST
—
The
CEC
FFB
system
is
O.K.
Test
is
completed.
RETEST?
—
Do
you
want
to
retest?
CK
AIR
MGMT
SYS
—
Check
the
air
management
system.
MCU
OK
—
The
MCU
is
O.K.
MCU
DEFECTIVE
—
The
MCU
is
defective.
Replace
the
MCU
and
retest.
CK
CSW
CKT
—
Check
the
coolant
switch
circuit.
CK
TES
CKT
—
Check
the
thermal
electric
switch
circuit.
CK
ALT
CKT
—
Check
the
altitude
jumper
wire
circuit.
CK
WOT
CKT
—
Check
the
wide-open
throttle
switch
circuit.
6
General
Information
Definition
of
Tester
Displays
(Continued)
CON
ADAPTER
—
Connect
the
adapter
permanently.
RP
..
.OVER
RICH
—
Repair
an
over
rich
condition.
RP..
.OVER
LEAN
—
Repair
an
over
lean
condition.
/
CK
VSA
—
Check
the
vacuum
switch
assembly.
FLOOR
IT
&
HOLD
—
Press
the
accelerator
pedal
to
the
wide-open
throttle
position
and
hold
it
there.
REL
ACL
—
Lift
foot
from
the
accelerator
pedal.
WAIT..
.WARM
UP
—
Allow
the
engine
to
warm
to
normal
operating
temperature
before
proceeding.
CON
HRN
3-RED
—
Connect
test
harness
number
3-red
to
the
diagnostic
connectors.
CON
HRN
5
—
Connect
test
harness
number
5
to
the
MCU.
DO
CLD
LOOP
TEST
—
Perform
closed
loop
test.
HOLD.
.
.1500-2200
—
Maintain
an
engine
speed
between
1500
and
2200
rpm.
DIS
HRN
3-RED
—
Disconnect
test
harness
number
3-red
from
the
diagnostic
connectors.
CON
HRN
3-BLUE
—
Connect
test
harness
number
3-blue
to
the
diagnostic
connectors.
CK
CHOKE
&
FEED
—
Check
the
choke
and
power
source.
INC
RPM
+
2500
—
Increase
engine
speed
above
2500
rpm
and
maintain.
DGN
TEST
MCU
—
Is
this
going
to
be
a
diagnostic
test
or
an
MCU
test?
YES
ALT
VEH
NO
—
Is
this
vehicle
equipped
with
an
altitude
jumper
wire?
USA
CANADA
—
Is
this
vehicle
manufactured
per
U.S.
or
Canadian
standards?
YES
SEC
AIR
NO
—
Does
this
Canadian
vehicle
have
secondary
air
management?
CK
CTS
&
CHOKE
—
Check
the
closed
throttle
switch
and
the
choke.
DIS
CTS
—
Disconnect
the
closed
throttle
switch.
DIS
WOT
—
Disconnect
the
wide-open
throttle
switch.
CK
CTS/WOT
CKT
—
Check
the
closed
throttle
switch/wide-open
throttle
switch
circuit.
CK
CTS
CKT
—
Check
the
closed
throttle
switch
circuit.
RP
WOTSW
—
Repair
the
wide-open
throttle
switch.
CON
HRN
1
—
Connect
test
harness
number
1
to
the
diagnostic
connector.
CON
HRN
2
—
Connect
test
harness
number
2
to
the
MCU.
1981
YEAR
1982
—
What
model
year
is
this
vehicle?
1983
YEAR
1984
—
What
model
year
is
this
vehicle?
General
Information
7
Definition
of
Tester
Displays
(Continued)
CK
STP
MOT
—
Check
the
stepper
motor.
DIS
VAC
TO
DISTB
—
Disconnect
the
vacuum
hose
from
the
distributor
advance
unit.
CON
HRN
4
—
Connect
test
harness
number
4
to
the
MCU.
CON
VAC
TO
DISTB
—
Connect
the
vacuum
hose
to
the
distributor
advance
unit.
DO
UIM
SYS
TEST
—
Perform
a
universal
ignition
module
system
test.
HOLD
RPM
—
Maintain
a
specified
engine
speed.
CK
PCV
SYS
—
Check
the
positive
crankcase
ventilating
system.
AUTO
TRAN
MAN
—
Is
this
vehicle
equipped
with
an
automatic
or
manual
transmission?
CK
OPSW
&
CHOKE
—
Check
the
oil
pressure
switch
and
the
choke.
INC
RPM
+
2400
—
Increase
engine
speed
above
2400
rpm
and
maintain.
SHIFT
TO
DRIVE
—
Place
the
transmission
lever
in
the
drive
position.
SHIFT
TO
PARK
—
Place
the
transmission
lever
in
the
park
position.
SET
PARK
BRAKE
—
Activate
the
emergency
brake
pedal/handle
so
the
vehicle
will
not
move.
8
General
Information
6-CYLINDER
FLOW
CHARTS
DO
UIM
TEST
—
Perform
Electronic
Ignition
Retard
Test
Test
for
82
6-cyl.
NOTE:
Engine
should
be
at
normal
6-Cylinder
2
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