GxT Ferret 63 User Manual

®

DIAGNOSTIC			63
ENGINE ANALYZER
	CONTENTS
INTRODUCTION .....................................	1	Charging Starting		13
SPECIFICATIONS	1	Amps, Auxiliary Volts ...................
		Ignition Primary
OPERATING FEATURES				.............. 14
	2	Coil Oscl, Driver, Dwell,
Display ................................................		Spark Burn / Cylinder
Control Panel .....................................	2			16
Printer.................................................	2	Burn MilliSeconds .......................
Leads and Sensors ............................	3	Burn Slope ..................................		17
Timing Light.........................................	3	Power Balance / Cylinder
SETTING UP FOR TESTS				18
	4	Automatic & Manual	....................
Hookup Guidelines..............................		Cranking Analysis
Basic Setup Steps ..............................	5			20
DOING TESTS		Cranking History...........................
	6	Electronic Compression ...............		24
Control & Test Keys ............................		PRINTING REPORTS
Sensor Test				28
	8	Auto-Test Sequence..........................
Ohms/diode..................................		Visual Inspection Checklist ...............		29
O2 Sensor .....................................	8	ANALYZER SERVICE		30
Position Sensor..............................	9
Wiggle Scope.................................	9	REFERENCE INFORMATION		27
Ford & GM Codes .......................	10
Fuel Injection	11	TYPICAL READINGS ...........................		32
Duty, Hertz & mSec ......................		MAGNETIC PROBE TESTS		33
Hard Start
	12	DIESEL TIMING TESTS		33
Ignition Energy ............................

OPERATOR'S MANUAL

FERRET 63

DIAGNOSTIC ENGINE ANALYZER

ANALYZER

COVER

NOT

SHOWN

COVER

LATCH

TEST

KEYS

CONTROL

KEYS

AUXILIARY

CLIP red

48 CHARACTER

LCD DISPLAY

HANDLE

12 VOLT BATTERY CLIPS

PRIMARY COIL CLIP green

© Copyright 1994, Ferret Instruments, Inc.

TIMING LIGHT

ADVANCE DIAL

2/4 STROKE SWITCH

PRINTER

AMP

PROBE

SPARK

PICKUP

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 complexity 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.

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OPERATING FEATURES

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.

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.

AUXILIARY

AUXILIARY

AUXILIARY

AUXILIARY

PER CYLINDER

PER CYLINDER

PER CYLINDER

SENSOR

FUEL

HARD

CHARGING

IGNITION

SPARK

CRANKING

POWER

TEST

INJECTION

START

STARTING

PRIMARY

BURN

ANALYSIS

BALANCE

02 TPS

COIL MODULE

SECONDARY

COMPRESSION

%RPMDROP

MSEC, %DUTY, HZ

IGNITION VOLTS

AMPS

VOLTS

DWELL VARIATION

MSEC

SLOPE

BAT. STARTER ALT.

AUTO MANUAL

AMP ZERO

SETUP

SELECT

START

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.

	MESSAGE	PAPER	PRINT	PRINT
		ADVANCE	DISPLAY	AUTOTEST

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.

A BEEPER inside the analyzer indicates contact with keys and signals warnings.

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

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.

USE BLUE OR BLACK THERMAL PAPER 2.25" (58mm) WIDE.

.43" (11mm) minimum hole.

Paper

Roll

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To remove cover press fingers at both ends and lift inside edge.

Cover Retainers

Keep dust out of the printer to prevent accelerated lead screw wear.

LEADS AND SENSORS

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.

NO	BLACK	RED
TAG	–	+

12 VOLT

AMP PROBE

GREEN

TAG

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.

	RED	SPARK
		NO. 1 PICKUP
	TAG
	RED
	YELLOW	AUXILIARY
	TAG
	GREEN	COIL PRIMARY

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.

ADVANCE DIAL	2/4 STROKE
	ENGINE
KNOB	SWITCH

HI / LO

FLASH

ENGINE TRIGGERS CRANK

WHEEL

TIMING

MARKS

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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.

BATTERY

CLIPS

SPARK

PICKUP

AUXILIARY
red	EXTENSION
	HARNESS
	SPARK PICKUP
COIL PRIMAR	AMP
	PROBE
green	Face Label Side
	Toward Plug End

B+		+ –
		NO. 1	Put Amp Probe
		SPARK
			Around Either
		PLUG
			Battery Cable

AMP

PROBE

COIL /

AUXILIARY

	Make Firm
BATTERY	Battery Connections
CLIP	and Wiggle Clips
LEAD	for Clean Contacts.

BLACK RED

–+

12-VOLT BATTERY

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.

WARNING

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.

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.

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NDUCTIVE DC AMP PROBE

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.

PLACE AROUND WIRES

TO MEASURE AMPS

WHEN ZEROING

REMOVE FROM WIRES (or turn current off)

SETUP STEPS

1. CONNECT ONLY THE BATTERY CLIPS. The Battery 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.

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)

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.

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.

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DOING TESTS

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.

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.

AUXILIARY AUXILIARY AUXILIARY AUXILIARY

	SENSOR		FUEL	HARD	CHARGING
		TEST	INJECTION	START	STARTING
		02 TPS	MSEC, %DUTY, HZ	IGNITION VOLTS	AMPS	VOLTS

AMP ZERO

SETUP

SELECT

START

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 reading 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.

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.

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ENGINE DYNAMICS TEST KEYS

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.

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.

PER CYLINDER

IGNITION	SPARK
PRIMARY	BURN
COIL MODULE	SECONDARY
DWELL VARIATION	MSEC	SLOPE

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.

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.

PER CYLINDER PER CYLINDER

CRANKING	POWER
ANALYSIS	BALANCE
COMPRESSION	%RPMDROP
BAT. STARTER ALT.	AUTO MANUAL

	MESSAGE	PAPER	PRINT	PRINT
		ADVANCE	DISPLAY	AUTOTEST

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.

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 AutoTest 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.

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02 TPS

SENSOR

TEST

AUXILIARY

“SENSOR TEST” KEY

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

flash codes from Ford and GM engine control computers. The red Auxiliary Clip is the signal input.

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

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-

3

MEASURE

TO

GROUND

1

OPEN

2

GROUND

METER PROCEDURE

"DIODE" voltage in the forward and reverse directions can also be read by changing the test with SELECT.

OHMS to GND	Bat 12.45
DIODE	12.45v

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.

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

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-

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

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.

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		voltage lev-

els will be reported. Recheck the sensor for intermittent faults near the reported problem voltages.

If no irregularities were detected it will show:

No GLITCHES Found;

Press START

If the test

Too FAST; Retest Slower

Too SLOW; Retest Faster

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

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 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.

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.

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