GxT Ferret 63 User Manual
DIAGNOSTIC
TM
®
ENGINE ANALYZER
CONTENTS
INTRODUCTION ..................................... 1
SPECIFICATIONS .................................. 1
OPERATING FEATURES
Display ................................................ 2
Control Panel ..................................... 2
Printer................................................. 2
Leads and Sensors ............................ 3
Timing Light ......................................... 3
SETTING UP FOR TESTS
Hookup Guidelines .............................. 4
Basic Setup Steps .............................. 5
DOING TESTS
Control & Test Keys ............................ 6
Sensor Test
Ohms/diode .................................. 8
O2 Sensor ..................................... 8
Position Sensor .............................. 9
Wiggle Scope ................................. 9
Ford & GM Codes ....................... 10
Fuel Injection
Duty, Hertz & mSec ......................11
Hard Start
Ignition Energy ............................ 12
Charging Starting
Amps, Auxiliary Volts ................... 13
Ignition Primary
Coil Oscl, Driver, Dwell, .............. 14
Spark Burn / Cylinder
Burn MilliSeconds ....................... 16
Burn Slope .................................. 17
Power Balance / Cylinder
Automatic & Manual .................... 18
Cranking Analysis
Cranking History ........................... 20
Electronic Compression ............... 24
PRINTING REPORTS
Auto-Test Sequence .......................... 28
Visual Inspection Checklist ............... 29
ANALYZER SERVICE .......................... 30
REFERENCE INFORMATION .............. 27
TYPICAL READINGS ........................... 32
MAGNETIC PROBE TESTS ................. 33
DIESEL TIMING TESTS ....................... 33
63
OPERATOR'S MANUAL
AUXILIARY
CLIP
red
PRIMARY
COIL CLIP
green
12 VOLT
BATTERY
CLIPS
SPARK
PICKUP
AMP
PROBE
PRINTER
TEST
KEYS
CONTROL
KEYS
2/4 STROKE
SWITCH
TIMING LIGHT
ADVANCE DIAL
HANDLE
48 CHARACTER
LCD DISPLAY
ANALYZER
COVER
NOT
SHOWN
COVER
LATCH
FERRET 63
DIAGNOSTIC ENGINE ANALYZER
© Copyright 1994, Ferret Instruments, Inc.
OPTIONAL EQUIPMENT
854 - Magnetic TDC Detector
754 - Diesel Injection Detector
INTRODUCTION
The Engine Analyzer is a time saving instrument for
troubleshooting automotive ignition, fuel injection and
electrical power systems. It provides computer controlled
measurements that are usually only found on diagnostic
ʻscopes. Measurement methods have been engineered
to reduce hookup effort and give speedy test results.
The analyzer is designed for use on 2,3,4,5,6,8,10 and
12 cylinder as well as 2 and 3 rotor, distributor ignition, 2
and 4 stroke, 12 volt automotive engines.
It has a large LCD display with 2 lines of 24 characters
showing numbers, words and symbols. All test keys display related multiple simultaneous measurements.
Diagnostic messages are given when the analyzer detects combinations of signals which suggest an engine
defect.
A built-in printer records the screen being shown or
prints the data saved from tests. The printout is formatted to make easy before-and-after repair comparisons.
Print options include a vehicle identification form, and
a vehicle equipment visual checklist report to help give
complete repair information to the vehicle owner.
For time-efficient testing, an Auto-Test Sequence leads
the user through all of the tests for a complete printed
test report.
Test leads include a Timing-Advance Strobe Light, an
Inductive Amps Probe, an Inductive Spark Pickup, a 2
clip signal lead set, a power lead set, and an extension
harness, each of which are plug-in field replaceable.
SPECIFICATIONS
TEST ACCURACY RANGE
Volts, Battery .................1% ......... 8 to 18 Battery Volts
Volts, Aux. [10 meg] ...... 1% .......................0 to 20 Volts
Amps, Inductive ............. 3% .............. 0 to +/- 600 Amps
Tachometer .................... 1% ........... 100 to 10,000 RPM
Fuel Injector ................ 0.2mS .................... to 63 mSec
Pulse frequency ........... 1% ........................... to 250 Hz
Coil Energy .................. 5% ..... to 90 milliVolt-Seconds
Coil Oscillations ................. to 10 Oscillations
Spark Burn Time ........ 0.2mS ........ to 9.9 milliSeconds
Spark burn slope ..........................................+/- 99 units
Test duration .....................................................Seconds
Cranking ............................................RPM, Volts, Amps
Alternator ...............................................Amps & Ripple
Battery .................................................................... CCA
Timing Advance ........... 1.5° .............. to 60.0 Degrees
Dwell, Ignition .............. 0.5° ..........Degrees, %, mSec
Points/Driver Res. ........ 0.1v .......................to 2.5 Volts
Dwell Variation ...................................... to 90.0 Degrees
Timing Variation .................................... to 90.0 Degrees
Cylinder Power Balance .......................% RPM Change
Relative Compression ..................Cranking Amps Peak
Ohms ............................ 5% ................... 1 to 50K ohms
Diode ........................................................ Forward Volts
Position Sensor ........................................ Glitch catcher
O2 Sensor ...........................................Volts & crossings
Wiggle Scope ................................. HI/LO from 3.5 volts
WARNING
It can be hazardous to operate both a moving car and
the analyzer. Get someone to drive the car while you
read the display.
DIMENSIONS
Size ............140 x 350 x 470 mm .......5.5" x 14" x 18.5"
Leads .................................. 1.7 m ......................... 5 feet
Extension Harness .............2.5 m ......................... 8 feet
Operation ................... 4° to 44°C ............ 35°F to 120°F
Storage .................... -20° to 60°C ...........-20°F to 130°F
Weight ..................................8 kg .......................18 lbs.
Power Requirement .................................12 Volt Vehicle
Battery
The measurement capabilities of this analyzer were selected to serve the diagnostic needs of the professional
automotive service technician. Because of the com-
plexity and variety of the tests, the user must refer to
the vehicle specific diagnostic manuals to be assured
that correct conclusions are reached. This manual is
limited to describing the features of the analyzer and its
application requirements.
-1-
OPERATING FEATURES
SENSOR
TEST
02 TPS
SETUP
AMP ZERO
SELECT
MESSAGE
PRINT
DISPLA
Y
PRINT
AUTOTEST
CHARGING
ST
ARTING
AMPS VOLTS
IGNITION
PRIMARY
COIL MODULE
DWELL VARIATION
AUXILIARYAUXILIARY PER CYLINDER
CRANKING
ANALYSIS
COMPRESSION
BAT. STARTER ALT.
POWER
BALANCE
% RPM DROP
AUTO MANUAL
PER CYLINDER
SPARK
BURN
SECONDARY
MSEC SLOPE
PER CYLINDER
HARD
ST
ART
IGNITION VOLTS
AUXILIARY
FUEL
INJECTION
MSEC, % DUTY, HZ
AUXILIARY
START
PAPER
ADVANCE
USE BLUE OR
BLACK THERMAL
PAPER 2.25"
(58mm) WIDE.
.43" (11mm)
minimum hole.
Paper
Roll
Cover Retainers
To remove cover
press fingers at
both ends and lift
inside edge.
Keep dust out of the printer
to prevent accelerated lead
screw wear.
DISPLAY
The 2 by 24 character LCD dot matrix display provides a
versatile screen for the display of multiple sets of meter
outputs as well as data arrayed by cylinder. Contrast can
be adjusted with the SETUP key. A cast acrylic window
protects the display.
CONTROL PANEL
A MEMBRANE KEYBOARD controls the analyzer. It is a
pressure sensitive lamination of metalized plastic sheets
with small spaces between contacts. It is very durable
but can be harmed by chemical solvents or punctured by
sharp objects.
HOUSING
The case is designed to be a convenient to use protective enclosure. Rounded corners and the plastic base
were chosen to help guard mechanical and electrical
contact with the battery, engine, and car body parts. In
use, place the unit on a cart, in the engine compartment,
or inside the car. The compartment under the control
panel is made to store the leads and harness.
THE TEST KEYS on the top row activate readouts or
initiate tests which require actions by the user to arrange
engine and vehicle test conditions.
BOTTOM ROW KEYS select test options, start action,
and make adjustments.
PRINTER
The printer will capture any displayed data or message
during non-sequenced testing if PRINT DISPLAY is
pressed, and at the end of the sequenced tests it will
print the resulting data and messages from the PRINT
AUTOTEST - Print Data command. If only some of the
data saving tests have been done since power-up, they
will be the only ones printed. PRINT REPORT offers an
AutoTest option to complete a full set of printed tests in
the shortest possible time.
The PAPER ADVANCE key is used to feed a new roll of
paper into the printer. Once the paper is in place it may
be pulled through to extend the end of a report before
tearing it off. Do not pull the paper backwards through
the mechanism.
Only the outside surface of the paper roll is sensitized
for printing, so it must feed from the bottom of the roll
into the mechanism. Getting the paper started is easiest
if the leading edge is cut cleanly. Push it into the slot 2
to 3 cm and press PAPER ADVANCE. Each key press
A BEEPER inside the analyzer indicates contact with
keys and signals warnings.
moves the paper feed 2 lines. If it does not feed, lift the
printer cover for better access and try again.
See the Printing Reports section (p28) for more details.
-2-
LEADS AND SENSORS
NO
TA
G
GREEN
TA
G
AMP PROBE
12 VOLT
+
–
RED
BLACK
ADVANCE DIAL
KNOB
ENGINE
CRANK
WHEEL
TIMING
MARKS
HI / LO
FLASH
TRIGGERS
2/4 STROKE
ENGINE
SWITCH
RED
TA
G
YELLOW
TA
G
AUXILIARY
COIL PRIMARY
NO. 1
SPARK
PICKUP
RED
GREEN
12 VOLT BATTERY CLIP LEAD SET
This is a multiconductor cable which draws power from
the battery and senses the voltage. It should be the first
set of lead clips connected.
INDUCTIVE SPARK PICKUP
Cylinder synchronization and tachometer input are the
function of this lead. Features of this easy to use 8mm
wire spark current sensing pickup are dependable spark
pulse detection, ruggedness and plug-in replacement.
The unique design has an easy grip handle and a latching jaw mechanism for durability. The housing is made
of glass fiber reinforced plastic with high temperature
strength and solvent resistance.
INDUCTIVE AMPS PROBE
The Hall effect Amps Probe senses DC current in wires
without having to disturb connections and without introducing any voltage drop. Up to 20 mm (.75”) diameter
cables may be read. A distinctive arrow is marked on
both sides which indicates the direction of positive current flow for a positive analyzer readout. Materials in
the probe are selected for enduring performance. If
damaged, a new probe may be plugged into the analyzer
without additional service.
EXTENSION HARNESS
A set of 4 identical cables are sheathed to form a harness to extend the leads enough to reach from a carʼs
interior to the engine. They have color markers for lead
coordination. The long tailed end connects to the analyzer connector. Take care between door panels that it
does not get pinched enough to shear. Any of the leads
may be plugged directly into the analyzer without the
extension.
COIL PRIMARY / AUXILIARY LEAD CLIPS
Both clips have a prod tip and an insulation penetrating
pin cluster so they are adaptable to many connections.
The wires are neoprene insulated copper. The red clip
is used for auxiliary tests. The green clip lead, is always
connected to coil primary TACH.
TIMING-ADVANCE STROBE LIGHT
The Timing Light may be used when a spark signal and
power from the analyzer leads are present. Advance settings are controlled and read directly from the calibrated
dial. The 2/4 stroke switch changes the dial calibration
by a factor of 2 for the ignition type.
To measure an engine's spark advance, clean the crank
wheel marks for good visibility and run the engine with
the appropriate test conditions. Turn the advance dial to
about the expected reading, press the light's trigger while
shining the light at the wheel marks, and then adjust the
knob so the marks appear aligned to TDC. The dial setting is the spark advance angle in degrees of crank shaft
rotation.
The two trigger buttons control flash brightness. Operation of the analyzer is not affected by the Timing Light so
it may be unplugged any time.
-3-
AUXILIARY
red
SPARK PICKUP
COIL PRIMARY
green
Face Label Side
Toward Plug End
NO. 1
SPARK
PLUG
Put Amp Probe
Around Either
Battery Cable
12-VOLT
BATTERY
AMP
PROBE
EXTENSION
HARNESS
BLACK RED
BATTERY
CLIP
LEAD
Make Firm
Battery Connections
and Wiggle Clips
for Clean Contacts.
BATTERY
CLIPS
SPARK
PICKUP
AMP
PROBE
COIL /
AUXILIARY
B+
+ –
– +
SETTING UP FOR TESTS
HOOKUP GUIDELINES
Color labels for matching the cable connections between
the analyzer and the clips are marked on the panel just
above the connectors. Mismatched connections will
prevent the leads from working, but will not cause harm
under normal conditions.
Take care to find a secure footing and safe lead routing
away from exhaust manifolds and fan belts.
12 VOLT BATTERY CLIP LEAD SET
These clips must have a solid connection to the battery
terminals. Reliable analyzer operation depends upon a
continuous power source. Intermittent power will reset
the analyzer to its start-up state. It is possible to draw
power from other points in the vehicle wiring, but the
measurements may be misleading because wiring resistance may interfere with the tests.
AUXILIARY CLIP LEAD
This red clip does not have a specific connection for the
basic hookup. It is the input for Auxiliary Volts, Ohms/
Diode readings, Wiggle Scope, and Sensor/Fuel Injector
Pulses. See SENSOR TEST test descriptions for connection locations.
Do not run engine with the Auxiliary lead connected
to engine sensors while the spark pickup and coil
primary leads are connected to the ignition. The analyzer leads can couple ignition noise into the engine
computer and disrupt engine operation.
WARNING
IGNITION COIL PRIMARY CLIP LEAD
This green clip connects to the ignition coil primary winding minus terminal, sometimes labeled “TACH”. It is the
signal source for all of the ignition measurements, and it
is necessary for ignition suppression.
INDUCTIVE SPARK PICKUP
The best hookup arrangement is to place the pickup
around the spark plug wire, as far from the spark plug as
possible, and with the “Spark Plug” labeled side pointing toward the spark plug end of the wire. Be sure the
pickup magnetic cores are touching.
Placing the pickup far from the spark plug keeps it away
from the hot exhaust manifold, and improves performance, because spark current impulses are “cleaner”
near the distributor.
When the pickup is not being used, LEAVE THE JAWS
IN THE OPEN position. The magnetic cores are made of
ferrite ceramic and when kept apart they are more likely
to not break if the pickup is dropped.
-4-
NDUCTIVE DC AMP PROBE
PLACE AROUND WIRES
TO MEASURE AMPS
WHEN ZEROING
REMOVE FROM WIRES
(or turn current off)
The reading range is 000 to +/-600 amps DC in 1 amp
steps. Starter and alternator output current measurement
is the primary application. It also allows the measurement
of vehicle accessory currents. Placing the probe on the
battery cable, while the engine is off, and then watching
the change when operating switches allows checking
many loads rapidly. Use AMP ZERO to restore the reading to zero before putting the probe around any wires.
SETUP STEPS
1. CONNECT ONLY THE BATTERY CLIPS. The Bat-
tery Clips must go to the engineʼs 12 volt battery terminals, red clip to plus, black clip to minus. The model
description will be displayed momentarily.
The analyzer may give you a choice of languages. Once
a language is selected it cannot be changed until the
analyzer power is disconnected.
2. DO THE SETUP. The display will automatically switch
to the Setup function. The SETUP key is only used to
change settings. Use SELECT for selecting choices.
Press START when the correct selection is displayed
which will advance the analyzer to the next Setup item.
There are 4 selections of contrast for the display. More
"=" makes the display darker
SELECT:====
LCD Contrast then START
This is when the operator tells the analyzer about the
engine.
SELECT: Elect./ 4S Sroke
Ignition then START
The ignition type and engine strokes selection are combined. The combinations are of Electronic or Points
Contact, and 2 or 4 Stroke.
3. Then the Amp Probe reading is zeroed.
Remove AMPPROBE from CAR
then START
The probe should not be around any wires when you
press START. When complete, the analyzer will automatically go to the HARD START test.
4. HOOKUP THE REMAINING LEADS.
Now see that all analyzer leads are connect, and then
run the engine.
If there is not yet an active signal into the coil primary
clip it will show:
Check Connections!
-Run Engine-
The data screen will appear when inputs are active.
356 RPM msg Bat 10.34
IgEgy 38 Aux>POS- 1.34
5. PRESS ANY TEST KEY.
If the HARD START test screen shows normal readings indicating that the analyzer hookup is working, we
suggest that you do a general ingine review using the
AUTOTEST at the PRINT AUTOTEST key.
SELECT: 4 CYL
CYLINDERS then START
Selections are 2,3,4,5,6,8,10,12 CYLinders, and 2 or 3
ROTors.
SELECT: mSec
Dwell Scale then START
Select DEGrees, mSeconds, or % (percent)
If the analyzer resets on its own check that the Battery clips have good connections. Also, if the engine
has metallic secondary ignition wires, try replacing
the coil to distributor wire for the test with a 10 K to
20 K ohm resistance wire.
-5-
DOING TESTS
SENSOR
TEST
02 TPS
CHARGING
ST
ARTING
AMPS VOLTS
IGNITION
PRIMARY
COIL MODULE
DWELL VARIATION
AUXILIARYAUXILIARY PER CYLINDER
SP
BURN
SECONDARY
MSEC SLOPE
PER CYLINDER
HARD
ST
ART
IGNITION VOLTS
AUXILIARY
FUEL
INJECTION
MSEC, % DUTY, HZ
AUXILIARY
SENSOR
TEST
02 TPS
SETUP
AMP ZERO
SELECT
MESSAGE
CHARGING
STARTING
AMPS VOLTS
IGNITION
PRIMARY
COIL MODULE
DWELL VARIATION
AUXILIARYAUXILIARY PER CYLINDER
SP
BURN
SECONDARY
MSEC SLOPE
PER CYLINDER
HARD
START
IGNITION VOLTS
AUXILIARY
FUEL
INJECTION
MSEC, % DUTY, HZ
AUXILIARY
START
PAPER
ADVANCE
AUXILIARY INPUT TEST KEYS
Typical features of the tests are the RPM and the Battery
Volts readouts.
1057 RPM msg Bat 13.84
The RPM reading in the upper left of the display gets the
signal input from the Inductive Spark Pickup. Scaling is
determined by the setup selections.
The Battery Volts reading in the upper right display corner
comes from the Battery Clips.
SENSOR TEST has the following sensor and signal
tests. The Ohmmeter can be used for resistance checks
of spark plug wires or components. The Diode test measures forward and reverse diode voltage. The Oxygen
Sensor test measures the activity level of the O2 Sensor
voltage. The Throttle Position Sensor test is a computer
aided test to find intermittent TPS sensors. The Wiggle
Test, and GM & Ford Code tests will help you retrieve
trouble codes from some computer controlled engines.
See pages 8-10.
Contrast then START
FUEL INJECTION helps to trouble shoot EFI, PFI, TBI,
and Computer Controlled Carburetor engines. The Duty
Cycle test reads Hertz (Frequency) and Duty Cycle
(Dwell) for use on solenoid equipped carburetors. Also
use for checking pressure, flow, Hall effect, and other
sensors that are specified by these measurements. The
Fuel Injection test measures the milliSeconds of voltage
drive to an injector. See page 11.
Use HARD START to find the problem area on a no start
engine. Ignition Energy indicates the ignition's strength.
Auxiliary Volts is used to confirm that voltage is present
at the ignition. RPM and Battery Voltage are used to
measure the performance of the cranking system. Special diagnostics pick out problems with the spark plugs,
wires, cap and rotor. See page 12.
CHARGING STARTING measures cranking speed, voltage regulator setting, starter draw, accessory draws, and
alternator output. The Auxiliary Volts is great for voltage
drop tests. Diagnostics monitor the alternator for excessive amps ripple indicating a bad diode or stator. See
page 13.
CONTROL KEYS
This lower row of keys select test choices, look up messages, restart tests, and operate the printer.
Pressing AMP ZERO subtracts whatever the amps read-
ing was so that the reading becomes zero. If amps fails
to work, read the Amp Probe Check procedure in this
manualʼs Service section.
SETUP is used to input information about the engine
being tested, and provides four levels of display contrast
adjustment.
-6-
When there are choices in a test, SELECT steps through
the selection. The last displayed choice is made active
by pressing START.
START takes the operation to the next test step. It
continues an operation after some conditions have been
prepared by the operator.
START also clears Min and Max readings on Spark Burn
and Fuel Injection tests.
ENGINE DYNAMICS TEST KEYS
IGNITION
PRIMARY
COIL MODULE
DWELL VARIATION
CRANKING
ANALYSIS
COMPRESSION
BAT. STARTER ALT.
POWER
BALANCE
% RPM DROP
AUTO MANUAL
PER CYLINDER
SP
ARK
BURN
SECONDARY
MSEC SLOPE
PER CYLINDER
MESSAGE
PRINT
DISPLA
Y
PRINT
AUTOTEST
IGNITION
PRIMARY
COIL MODULE
DWELL VARIATION
CRANKING
ANALYSIS
COMPRESSION
BAT. STARTER ALT.
POWER
BALANCE
% RPM DROP
AUTO MANUAL
PER CYLINDER
SP
ARK
BURN
SECONDARY
MSEC SLOPE
PER CYLINDER
PAPER
ADVANCE
These keys measure engine power cycle functions to
find causes of rough running. “PER CYLINDER” tests
store the gathered data in memory for after-test review
and printout. This permits seeing trend and cylinder differences in the engine data.
The sequenced tests in the next column have pauses to
display instructions. Press START for the next step after
an instruction has been completed.
IGNITION PRIMARY is used to find bad ignition coils and
modules using the measurements of Oscillations, Ignition
Coil Energy, Dwell, and Driver Voltage. Use the Dwell
and Timing Variation tests to find loose timing chains,
worn distributor shafts and bearings. See page 14.
CRANKING ANALYSIS has two test sequences to measure Relative Compression, Cranking Volts, Cranking
Amps, Cranking RPM, Alternator Amps, and the CCA of
the battery. The Compression test finds cylinders with
low relative compression, and shows it on the printout
bar graph. See pages 20-23.
POWER BALANCE performs an Automatic or Manual
Power Balance test to locate low power cylinders. Each
spark plug is turned off one at a time and the RPM drop
is measured. The greater the drop in RPM, the stronger
the cylinder. Cylinders with a small drop should be tested
further to determine the problem. A Power Balance bar
graph is produced with the printed report. See page
18.
SPARK BURN easily finds defects with spark plugs,
sparkplug wires, distributor cap, and rotor. It measures
the Minimum, Average, and Maximum Spark Burn Time
for each cylinder. Spark Slope is measured to indicate
a lean or rich fuel mixture. A Burn Time Range bar graph
is produced with the printed report. See pages 16-17.
Ignition suppression is used in CRANKING ANALYSIS
and POWER BALANCE. The analyzer can suppress the
usual inductive discharge distributor ignition, but will not
work on capacitive discharge and multicoil ignitions. A
compatibility check is done by the analyzer before it will
apply suppression. If the check finds it incompatible, the
user will be notified to manually disable either the ignition
or fuel system.
Press MESSAGE when "msg" appears in the middle of
the display. This means a diagnostic check detects an
out of limit condition. Repeated presses of MESSAGE
will step through all the diagnostic messages and finally
back to the test. Messages may appear intermittently if
the condition is on the threshold of being a problem.
Messages suggest causes of problems, but do not
prove the suggested item is bad.
-7-
PAPER ADVANCE feeds 2 lines of paper for each
press.
PRINT DISPLAY prints what is on the display.
PRINT AUTOTEST prints test reports and is the Auto-
Test entry key. The Auto-Test will run all of the engine
dynamics tests in an automatic sequence. At the conclusion of the data report, you can also print the visual
inspection checklist. See pages 28-29.
1
OPEN
2
GROUND
3
MEASURE
TO
GROUND
“SENSOR TEST” KEY
SENSOR
TEST
02 TPS
CHARGING
ST
ARTING
AMPS VOLTS
IGNITION
PRIMARY
COIL MODULE
DWELL VARIATION
AUXILIARYAUXILIARY PER CYLINDER
CRANKING
ANALYSIS
COMPRESSION
BAT. STARTER ALT.
POWER
BALANCE
% RPM DROP
AUTO MANUAL
PER CYLINDER
SPARK
BURN
SECONDARY
MSEC SLOPE
PER CYLINDER
HARD
ST
ART
IGNITION VOLTS
AUXILIARY
FUEL
INJECTION
MSEC, % DUTY, HZ
AUXILIARY
Use SELECT and START to choose tests for measuring
ohms or diode volts, measuring oxygen
sensor voltage and crossings, checking
for irregular throttle position sensors
(TPS), watching for intermittent voltage
with the Wiggle Scope, and reading fault
OHMS RESISTANCE / DIODE VOLTS
The resistance of a device is measured by connecting
the red Auxiliary Clip to one of the deviceʼs terminals and
contacting the other device terminal to the battery/engine
ground. A continuity beeper sounds when readings are
below 25 ohms, and “OVER” shows for greater than 50K
ohms. (Ground = chassis)
SELECT: OHMS to GROUND
TEST then START
Prior to using ohms the analyzer must do an open/ground
lead test which checks the low and high range ends.
Disconnect AUX lead
then START
flash codes from Ford and GM engine control computers.
The red Auxiliary Clip is the signal input.
METER PROCEDURE
STEP 1: Infinite resistance is checked.
Connect AUX to GND
then START
STEP 2: Ground zero calibration is done.
Responses are given to guide the calibration process. If
the carʼs battery voltage drifts during the test the calibration may also drift. Press START to redo the recalibration procedure.
OHMS to GND Bat 12.45
OHMS 0
STEP 3: Read resistance to ground.
OHM-
OXYGEN LAMBDA SENSOR
The red Auxiliary Clip has a 10 megohm input for this
test. The display shows the average sensor output voltage, the number of times the voltage crosses the 0.45
level per second, and whether the immediate voltage
indicates rich or lean by the R/L display.
Oxygen Sensor 0.83 v
0.0 Crossings/Sec R/L
Typical cross count readings for warm engines running at
"DIODE" voltage in the forward and reverse directions
can also be read by changing the test with SELECT.
Note that resistance is measured by applying the carʼs
battery voltage through a 1000 ohm resistor in the analyzer, so that up to 15 milliamps may pass through the
tested device. An advantage of this current is that LEDs
can be checked for light output, and diode forward and
reverse voltages can be checked at a more normal operating level.
a steady fast idle are in the 1 to 3 range. Low rates may
indicate a damaged O2 sensor. Multiports usually cross
count fastest and carbureted engines the slowest.
Connect at sensor harness plug or ECM. Do not penetrate wire insulation where moisture could cause electrical leakage to ground.
-8-
OHMS to GND Bat 12.45
DIODE 12.45v
THROTTLE POSITION SENSOR
This is a computer aided test to check for skips in a
position sensor signal sweep. When a position sensor
on a throttle or air flow vane is moved from the rest position to the top, the output voltage should move just like
the position shaft. The voltmeter reading for this test
updates rapidly so that small irregularities are not likely
to be missed.
SELECT : POSITION SENSOR
TEST then START
Press START.
CONNECT Aux to TP Sensor
Engine OFF; Key ON
DETECT ON 0.84 v
Move SLOWLY to W.O.T
With the "DETECT ON" display, make a smoothly increasing sweep during 3 to 7 seconds to the top position. The test ends automatically when the voltage stops
changing. Findings are reported when the test ends.
Possible Problem 1.93v
Press START
If glitches were detected, the corresponding voltage levels will be reported. Recheck the sensor for intermittent
faults near the reported problem voltages.
If no irregularities were detected it will show:
Then connect Auxiliary Clip to the output wire and press
START.
Using the following voltmeter display, check that the output responds to a typical range of 1 to 4 volts when the
position sensor shaft is turned.
0.84 v
for test: Press START
In the TP Sensor test the analyzer detects abrupt voltage
changes that an intermittent sensor contact would make.
Be ready to smoothly turn or press the position sensor
through its full sweep. Press START.
WIGGLE SCOPE
The Wiggle Scope display can be selected to see a line
trace of slow or intermittent voltage changes. It has a 10
megohm input impedance.
SELECT: WIGGLE SCOPE
TEST then START
No GLITCHES Found;
Press START
If the test was run too fast or slow it will show:
Too FAST; Retest Slower
Too SLOW; Retest Faster
Wiggle Scope can be used to watch for regular or intermittent pulses on wires for accessories, sensors, lamps,
solenoids, slow computer codes, or other on/off electrical
signals. The shortest step is about 1/10th second on the
fastest scan.
This display is like a chart recorder that is written at the
left of the screen and flows off the right end. It shows
voltage levels and changes above or below 4 volts
sensed by the Auxiliary Clip.
Level changes during an interval are shown different
ways: an / or \ shows a simple change, a T or its inverse
means there was a change but the start and end were
the same, ||| shows that there were many changes.
WIGGLE SCOPE Scan 2 Sec
ˇˇ/\|/T\/__\/-----------
The number following "SCAN" is the time for the signal
to sweep across the display. SELECT can choose a 2,
4, 8 or 16 second sweep.
-9-
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