Instruction Manual
37
Part 3: Wiggle Test
(Sometimes called Continuous Monitor test.)
• This test can help locate intermittent
faults in SOME circuits (see chart on
page 36).
• When Wiggle test is activated, the
Code Scanner STO light and Audio
tone will turn on if a problem is
detected.
• The STO light and tone are only
energized as long as the fault is
present. If the problem goes away,
the light and tone will turn off.
• If the STO light and tone come on as
you wiggle a sensor, connector or
wiring, that’s where the problem is!
1) Safety First!
• Set the parking brake.
• Put shift lever in PARK (automatic
transmission) or NEUTRAL (manual
transmission).
• Block the drive wheels.
2) Make Sure
Ignition Key
is in OFF
Position
3) Check Code Scanner Battery
• Refer to Section 2.
4) Connect Code Scanner
• Refer to Section 3.
• Plug BOTH test connectors into the
Code Scanner!
5) Put HOLD/TEST Switch in HOLD
Position
6) Put AUDIO Switch in ON Position
7) Turn Ignition Key to ON Position
but DO NOT START ENGINE
8) Depending upon Vehicle Model
Year....
• 1986 & Older: “Wiggle Test” is now
activated! Go to Step 9.
• 1987 & Newer:
—Without pausing, move HOLD/
TEST switch to TEST then to
HOLD and then back to TEST.
—“Wiggle Test” is now activated!
Go to Step 9.
9) Perform “Wiggle Test” on
Suspected Circuit
• Lightly tap sensor.
• Wiggle sensor connector.
• Twist and shake wiring between
sensor and computer.
• If the above
actions recreate
an intermittent
fault, the STO
light will light
and a tone will
sound for as
long as the fault
is present. This
can help locate the area of an
intermittent problem!
NOTE: If a fault is recreated this way,
a service code will be stored in
computer memory. Be sure to erase
this code from memory after making
all repairs. Refer to Section 4 (Self-
Test Part 5: Erasing “Continuous
Memory” codes).
10) Move Switches:
• HOLD/TEST switch to HOLD.
• AUDIO switch to OFF.
11) Turn Ignition Key to Off Position
12) Disconnect Code Scanner
T
M
TEST
HOLD
CP 9015 - Ford, Lincoln & Merc
ury
AUDIO
ON
OFF