Performance Tool W2969 User manual

OWNER'S MANUAL
�WARNING: READ, UNDERSTAND AND FOLLOW ALL INSTRUCTIONS AND
WARNINGS BEFORE OPERATING THIS TOOL. FAILURE TO DO SO MAY
RESULT IN PERSONAL INJURY AND/OR PROPERTY DAMAGE AND WILL
VOID WARRANTY.
DIGITAL
AUTOMOTIVE MULTIMETER
Item Number W2969
Index
Safety Precautions .................................. 2
Vehicle Service Information .................... 3
Visual Inspection ..................................... 3
1. MultimeterBasicFunctions
Functions and Display Definitions ...... 4
Safety Information ............................... 6
Manual Conventions ............................ 6
International Electrical Symbols ......... 6
BeforeUsing theMultimeter ............... 6
Specifications ..................................... 7
Maintenance ..................................... 7
Setting the Range ............................... 8
Battery and Fuse Replacement ......... 9
Measuring DC Voltage...................... 10
Measuring AC Voltage...................... 11
Measuring Resistance...................... 11
Measuring DC Current..................... 12
Testing Diodes .................................. 13
Testing Batteries ............................... 14
2. Automotive Testing
General Testing................................. 15
-Testing Fuses ................................. 15
- Testing Switches............................. 15
- Testing Solenoids and Relays........ 16
Starting / ChargingSystem Testing . 17
-No LoadBattery Test ......................17
-Engine Off Battery Current Draw... 18
-Cranking Load Test . 19
-Voltage Drops................................. 20
-ChargingSystem Voltage Test ...... 21
3. IgnitionSystem Testing
-Ignition Coil Testing ........................ 23
-Ignition System Wires..................... 25
- Magnetic Pick-Up Coils
-Reluctance Sensors........................ 26
4. Fuel System Testing
-Measuring Fuel Injector Resistance.. 25
5. Testing Engine Sensors
-Oxygen
(0 2) Type Sensors............. 29
-Temperature Type Sensors............ 31
-Position Type Sensors.................... 32
Electrical Specifications........................ 34
Warranty .................................................34

Bosch
Bosch

3
Vehicle Service Manual –Sources For Service
Information
Thefollowingisalistofsourcestoobtainvehicleserviceinformationforyour
specific vehicle.
•Contact your local Automotive Dealership Parts Department.
•Contact local retail auto parts stores for aftermarket vehicle service
information.
•Contactyourlocal library.Libraries oftenallow youtocheck-out automo-
tive service manuals.
Do a Thorough Visual Inspection
Do a thorough visual and “hands-on”underhood inspection before
starting any diagnostic procedure! You can find the cause of many
problems by just looking, thereby saving yourself a lot of time.
•Has the vehicle been serviced
recently? Sometimes things get
reconnected in the wrong place,
or not at all.
•Don’t take shortcuts. Inspect
hoses and wiring which may be
difficult to see due to location.
•Inspect the air cleaner and
ductwork for defects.
•Checksensorsandactuatorsfor
damage.
•Inspect ignition wires for:
- Damaged terminals.
- Split or cracked spark plug
boots
- Splits, cuts or breaks in the
ignition wires and insulation.
•Inspect all vacuum hoses for:
- Correct routing. Refer to ve-
hicle service manual, or Ve-
hicle Emission Control
Information(VECI) decal lo-
cated in the engine compart-
ment.
- Pinches and kinks.
- Splits, cuts or breaks.
•Inspect wiring for:
- Contact with sharp edges.
- Contactwithhotsurfaces,such
as exhaust manifolds.
- Pinched, burned or chafed in-
sulation.
- Proper routing and connec-
tions.
•Check electrical connectors for:
- Corrosion on pins.
- Bent or damaged pins.
- Contacts not properly seated
in housing.
- Bad wire crimps to terminals.

5
on display. In the hold mode, the
"H" annunciator is displayed.
6. TEST LEAD JACKS
BLACK Test Lead is
always inserted in the
COM jack.
REDTest Lead is in-
serted in the jack cor-
responding to the multimeter ro-
tary switch setting.
Always connect TEST LEADS to the
multimeter before connecting them
to the circuit under test!!
10. DISPLAY LIGHT
Press button to illuminate the dis-
play.
11.DISPLAY
Used to display all measurements
and multimeter information.
Low Battery– If this symbol ap-
pears in the lower left corner of the
display, then replace the internal
9V battery. (See Battery and Fuse
Replacement on
page 9.)
High Voltage
indicator
Overrange Indi-
cation – If “1” or “-
1” appears on the
left side of the dis-
play, then the mul-
timeter is set to a
range that is too
small for the
present measure-
ment being taken.
Increase the rangeuntil thisdisap-
pears.Ifit does notdisappear after
all the ranges for a particular func-
tionhavebeentried,thenthevalue
being measuredistoo large for the
multimeter to measure. (See Set-
ting the Range onpage 8.)
Zero Adjustment
The multimeter will automatically zero
on the Volts, Amps and Battery Test
functions.
Automatic Polarity Sensing
Themultimeterdisplaywillshowaminus
(-) sign on the DC Volts and DC Amps
functions when test lead hook-up is re-
versed.
7. AC VOLTS
This function is used for measur-
ing AC Voltages in the range of 0
to 500V.
8. DC AMPS
This function is used for measur-
ing DC (Direct Current) Amps in
the range of 0 to 10A.
9. 1.5V, 9V, AND 12V BATTERY
TEST
Thisfunctionisusedtotest1.5V,
9V, and 12V batteries under
load.
DC VOLTSAC VOLTS
OHMSDIODES
1.5V, 9V and 12V
BATTERY TESTS
DC AMPS

Safety Information
The multimeter complies with the standards UL61010: in pollution degree 2,
overvoltage category CAT I 600V, CAT II 300V, and double insulation.
CAT I : is for measurements performed on circuits not directly connected to
MAINS.
CATII:is formeasurementsperformedon circuitsdirectlyconnected to alow
voltage installation.
he
protection provided by the multimeter may be impaired.
Do not use the multimeter for measurements within categories III and IV.
Manual Conventions
Inthismanual,aWarning conditions andactions that pose hazards
to the user, or may damage the multimeter or equipment under test.
nature ofthe potentialhazard andthe actions, which haveto betaken.
International Electrical Symbols
LowBattery Grounding Warning
AC DC Diode
Double Insulation Continuity Buzzer
UL Conforms to Standards of UL61010
Before Using the Multimeter
Inspect the test leads for damaged insulation or exposed metal.
Replace damaged test leads with identical parts (same model number
and electrical sp before using the multimeter.
Only use the test lead assemblies which meet the manufacturer
tions.
Test the Digital multimeter on a known live circuit to verify that the
multimeter is working properly.
Do not use or store the multimeter in a hot, humid, explosive,
the multimeter may deteriorate after it is exposed to dampness.
When servicing the multimeter, use only the same model number or
identical electrical cations replacement parts.
6

accuracy = Specied accuracy +5%

11
Fig. 9
2. Insert BLACK test lead into
COM test lead jack.
3. Insert RED test lead into
test lead jack.
4. Turn multimeter rotary switch
to 200Ωrange.
Touch RED and BLACK multim-
eter leads together and view
reading on display.
Display should read typically
0.2Ωto 1.5Ω.
RedBlack
Unknown
Resistance
1. Insert BLACK test lead into
COM test lead jack.
2. Insert RED test lead into
test lead jack.
3. Connect RED test lead to one
sideof voltage source.
4. ConnectBLACKtestleadtoother
side of voltage source.
5. Turn multimeter rotary switch
to desired voltage range.
If the approximate voltage is un-
known,startatthelargestvoltage
rangeand decrease to theappro-
priate range as required. (See
Setting the Range on page 8.)
6. View reading on display.
NOTE: 200mV = 0.2V
Measuring Resistance
Resistance is measured in electrical
units called ohms (Ω). The digital
multimeter can measure resistance
from 0.1Ωto 20MΩ(or 20,000,000
ohms). Infinite resistance is shown
with a “1”on the left side of display
(See Setting the Range on page 8).
Youcanusethismultimeter todoany
resistance measurement called out
in the vehicle service manual. Test-
ing ignition coils, spark plug wires,
and some engine sensors are com-
mon uses for the OHMS (Ω)function.
To measure Resistance (see Fig. 9):
1. Turn circuit power OFF.
To get an accurate resistance
measurement andavoid possible
damage to the digital multimeter
and electrical circuit under test,
turn off all electrical power in the
circuit where the resistance mea-
surement is being taken.
To measure AC Voltages (see Fig. 8):
Fig. 8
Red
Black
Measuring AC Voltage
This multimetercan beusedtomea-
sure AC voltages in the range from
0 to 500V.
5. Turn multimeter rotary switch
to desired voltage range.
If the approximate voltage is un-
known, start at the largest voltage
range and decrease to the appro-
priate range as required. (See
Setting the Range on page 8.)
6. View reading on display - Note
range setting for correct units.
NOTE: 200mV = 0.2V

12
7. View reading on display - Note
range setting for correct units.
NOTE: 2KΩ= 2,000Ω; 2MΩ=
2,000,000Ω
If you want to make precise re-
sistance measurements, then
subtract the test lead resistance
found in Step 4 above from the
display reading in Step 7. It is a
good idea to do this for resis-
tance measurements less than
10Ω.
Measuring DC Current
This multimeter can be used to mea-
sureDCcurrentintherangefrom0to
10A. Unlike voltage and resistance
measurements where the multimeter
is connected across the component
you are testing, current measure-
mentsmustbemadewiththe multim-
eter in series with the component.
Isolating current drains and short cir-
cuits are some DC Current applica-
tions.
Fig. 10
Black
Red
Electrical
Device
DC
Voltage
Source
Fig. 11
Black
Red
Electrical
Device
DC
Voltage
Source
To measure DC Current (see Figs.
10 & 11):
1. Insert BLACK test lead into
COM test lead jack.
2. Insert RED test lead into"10A"
testlead jackor"mA" test lead
jack.
3. Disconnect or electrically
open circuit where you want
to measure current.
This is done by:
•Disconnectingwiringharness.
•Disconnecting wire from
screw-on type terminal.
•Unsolder leadfromcomponent
if working on printed circuit
boards.
•Cut wire if there is no other
possible way to open the electri-
cal circuit.
6. Turn multimeter rotary switch
to desired OHM range.
If the approximate resistance is
unknown,startatthelargestOHM
range and decrease to the ap-
propriaterangeasrequired.(See
Setting the Range on page 8.)
tobeconnectedacross thecom-
ponent.
If display reading was greater
than 1.5Ω, check both ends of
test leads for bad connections.
If bad connections are found,
replace test leads.
5. Connect RED and BLACK test
leads across component
where you want to measure
resistance.
When making resistance mea-
surements, polarity is not im-
portant. The test leads justhave

13
Fig. 12
leads across diode and view
display.
Display will show one of three
things:
•A typical voltage drop of
around 0.7V.
•A voltage drop of 0 volts.
•A“1”will appear indicating the
multimeter is overranged.
7. Switch RED and BLACK test
leads and repeat Step 6.
8. Test Results
If the display showed:
•A voltage drop of 0 volts in
bothdirections,thenthe diode
is shorted and needs to be
replaced.
•A“1”appears in both direc-
tions,thenthediodeisanopen
circuit and needs to be re-
placed.
•The diode is good if the dis-
play reads around 0.5V–0.7V
in one direction and a “1”ap-
pears in the other direction
indicating the multimeter is
overranged.
Testing Diodes
A diode is an electrical component
that allows current to only flow in one
direction. When a positive voltage,
generally greater than 0.7V, is ap-
plied to the anode of a diode, the
diode will turn on andallow current to
flow.Ifthis samevoltageisappliedto
the cathode, the diode would remain
off and no current would flow. There-
fore,inordertotestadiode,youmust
checkitinbothdirections(i.e.anode-
to-cathode, and cathode-to-anode).
Diodes are typically found in alterna-
tors on automobiles.
PerformingDiodeTest(seeFig.12):
Anode Cathode
Black
Red
1. Insert BLACK test lead into
COM test lead jack.
2. Insert RED test lead into
test lead jack.
3. Turn multimeter rotary switch
to function.
4. Touch RED and BLACK test
leads togetherto test continu-
ity.
Check display –should reset to
0.00.
5. Disconnect one end of diode
from circuit.
Diode must be totally isolated
from circuit in order to test its
functionality.
6. Connect RED and BLACK test
4. Connect RED test lead to one
side of disconnected circuit.
5. Connect BLACK test lead to
remaining side of discon-
nected circuit.
6. Turn multimeter rotary switch
to 10A DC position, 200mA or
200µAposition.
7. View reading on display.
If minus (-) sign appears on dis-
play, then reverse RED and
BLACK test leads.

14
Fig. 13
Black
Red Black
Red
Testing 1.5V, 9V and
12V Batteries
Test Procedure (see Fig. 13):
1. Insert BLACK test lead into
COM test lead jack.
2. Insert RED test lead into
test lead jack.
3. Turn multimeter rotary switch
to 1.5V, 9V or 12V range.
4. ConnectREDtestleadtoposi-
tive (+) terminal of battery.
5.
Connect BLACK test lead to
negative (-) terminal of battery.
6. View reading on display.

15
Section 2. AutomotiveTesting
The digital multimeter is a very use-
fultoolfortrouble-shootingautomo-
tive electrical systems. This section
describeshowtousethedigitalmul-
timetertotestthestartingandcharg-
ing system, ignition system, fuel
system, and engine sensors. The
digital multimeter can also be used
forgeneraltestingoffuses,switches,
solenoids, and relays.
General Testing
The digital multimeter can be used
to test fuses, switches, solenoids,
and relays.
Testing Fuses
This test checks to see if a fuse is
blown.
To test Fuses (see Fig. 14):
Fig. 15
Red
Typical "Push"
Button Switch
1. Insert BLACK test lead into
COM test lead jack.
2. Insert RED test lead into
test lead jack.
3. Turn multimeter rotary switch
to 2000Ωfunction.
4. Connect BLACK test lead to
one side of switch.
5. ConnectREDtestleadtoother
side of switch.
•If the reading is zero - The
switch is closed.
•If the reading is overrange -
The switch is open.
6. Operate switch.
•If the reading is zero - The
switch is closed.
1. Insert BLACK test lead into
COM test lead jack.
2. Insert RED test lead into
test lead jack.
3. Turn multimeter rotary switch
to 2000Ωfunction.
4. Connect RED and BLACK test
leadstooppositeendsoffuse.
•Ifthe reading iszero - Fuseis
good.
Fig. 14
Red Black
Fuse
Black
•If the reading is overrange -
Fuse is blown and needs to be
replaced.
NOTE: Always replace blown
fuseswithsame typeandrating.
Testing Switches
This test checks to see if a switch
“Opens”and “Closes”properly.
To test Switches (see Fig. 15):

16
6. View reading on display.
•Typical solenoid / relay coil re-
sistances are 200Ωor less.
•Refertovehicleservicemanual
for the device's resistance
range.
If meter overranges, turn multi-
meterrotaryswitchtonexthigher
range. (See Setting the Range
on page 8.)
7. Test Results
GoodSolenoid/ RelayCoil: Dis-
play in Step 6 is within manufac-
turers specification.
BadSolenoid/ RelayCoil:
•Display in Step 6 is not within
manufacturers specifications.
•Display reads overrange on
every ohms range indicating an
open circuit.
NOTE: Some relays and sole-
noidshaveadiodeplacedacross
the coil. To test this diode see
Testing Diodes on page 13.
1. Insert BLACK test lead into
COM test lead jack.
2. Insert RED test lead into
test lead jack.
3. Turn multimeter rotary switch
to 200Ωfunction.
Most solenoids and relay coil
resistances are less than 200Ω.
4. Connect BLACK test lead to
one side of coil.
5. ConnectREDtestleadtoother
side of coil.
•If the reading is overrange -
The switch is open.
7. Repeat Step 6 to verify switch
operation.
Testing Solenoids
and Relays
This test checks to see if a solenoid
or relay has a broken coil. If the coil
testsgood, it is still possible that the
relay or solenoid is defective. The
relay can have contacts that are
welded or worn down, and the sole-
noid may stick when the coilis ener-
gized. This test does not check for
those potential problems.
To test Solenoids and Relays (see
Fig. 16):
Relay or
Solenoid
Red
Black
Fig. 16

17
Starting/Charging System Testing
Thestartingsystem“turnsover”the engine.Itconsistsof thebattery,starter
motor,startersolenoidand/orrelay,andassociatedwiringandconnections.
Thechargingsystemkeeps thebatterychargedwhenthe engineisrunning.
This system consists of the alternator, voltage regulator, battery, and
associatedwiringand connections.Thedigital multimeterisa usefultoolfor
checking the operation of these systems.
No Load Battery Test
Beforeyoudo anystarting/charging
system checks, you must first test
the battery to make sure it is fully
charged.
Test Procedure (see Fig. 17):
Fig. 17
Black
Red
1. Turn Ignition Key OFF.
2. TurnON headlights for 10 sec-
onds to dissipate battery sur-
face charge.
3. Insert BLACK test lead into
COM test lead jack.
4. Insert RED test lead into
test lead jack.
5. Disconnectpositive(+)battery
cable.
6. ConnectREDtestleadtoposi-
tive (+) terminal of battery.
7.
Connect BLACK test lead to
negative (-) terminal of battery.
8. Turn multimeter rotary switch
to 20V DC range.
9. View reading on display.
10.Test Results.
Compare display reading in Step
9 with the following chart.
Percent
Voltage Battery is Charged
12.60V
or greater 100%
12.45V 75%
12.30V 50%
12.15V 25%
If battery is not 100% charged, then
chargeitbeforedoinganymorestart-
ing/charging system tests.

18
2. Insert BLACK test lead into
COM test lead jack.
3. InsertREDtestleadinto"10A"
(or "mA") test lead jack.
4. Disconnectpositive(+)battery
cable.
5. ConnectREDtestleadtoposi-
tive (+) battery terminal.
6. Connect BLACK test lead to
positive (+) battery cable.
NOTE: Do not start vehicle dur-
ing this test, because multimeter
damage may result.
7. Turn multimeter rotary switch
to 10A DC (or 200 mA) posi-
tion.
8. View reading on display.
•Typicalcurrentdrawis100mA.
(1mA = 0.001A)
•Refertovehicleservicemanual
for manufacturers specific En-
gine Off Battery Current Draw.
NOTE: Radio station presets
and clocks are accounted for in
the 100mA typical current draw.
9. Test Results.
Normal Current Draw: Display
readinginStep8 iswithinmanu-
facturers specifications.
Excessive Current Draw:
- Display reading in Step 8 is
well outside manufacturers
specifications.
- Remove Fuses from fuse box
one at a time until source of
excessive current draw is lo-
cated.
- Non-Fused circuits such as
headlights, relays, and sole-
noids should also be checked
as possible current drains on
battery.
- Whensourceofexcessivecur-
rent drain is found, service as
necessary.
Black Red
Fig. 18
Engine Off Battery
Current Draw
This test measures the amount of
current being drawn from the battery
whenthe ignitionkey and engineare
both off. This test helps to identify
possible sources of excessive bat-
tery current drain, which could even-
tually lead to a “dead”battery.
1. Turn Ignition Key and all ac-
cessories OFF.
Make sure trunk, hood, and
dome lights are all OFF.
(See Fig. 18)

19
5. Connect BLACK test lead to
negative (-) terminal of battery.
6. Turn multimeter rotary switch
to 20V DC range.
7. Crank engine for 15 seconds
continuously while observing
display.
8. Test Results.
ComparedisplayreadinginStep
7 with chart below.
Voltage Temperature
9.6V or greater70 °F and Above
9.5V 60 °F
9.4V 50 °F
9.3V 40 °F
9.1V 30 °F
8.9V 20 °F
8.7V 10 °F
8.5V 0 °F
Ifvoltage on display corresponds to
abovevoltagevs.temperaturechart,
then cranking system is normal.
Ifvoltage ondisplay does notcorre-
spond to chart, then it is possible
thatthebattery,batterycables,start-
ingsystem cables, starter solenoid,
or starter motor are defective.
Red Black
Cranking Voltage -
Battery Load Test
This test checks the battery to see if it
is delivering enough voltage to the
startermotorundercrankingconditions.
Test Procedure (see Fig. 19):
Fig. 19
1. Disableignition system so ve-
hicle won’t start.
Disconnect the primary of the
ignitioncoilorthedistributorpick-
up coil or the cam/crank sensor
to disable the ignition system.
Refer to vehicle service manual
for disabling procedure.
2. Insert BLACK test lead into
COM test lead jack.
3. Insert RED test lead into
test lead jack.
4. ConnectREDtestleadtoposi-
tive (+) terminal of battery.

20
5. Turn multimeter rotary switch
to 200mV DC range.
Ifmultimeteroverranges,turnmul-
timeter rotary switch to the
2000mV DC range. (SeeSetting
the Range onpage 8.)
6. Crank engine until steady
reading is on display.
•Record results at each point
as displayed on multimeter.
•Repeat Step 4 & 5 until all
points are checked.
7. Test Results –
Estimated Voltage Drop of
Starter Circuit Components
ComponentVoltage
Switches300mV
Wire or Cable200mV
Ground100mV
Test Procedure (see Fig. 20):
1. Disable ignition systemso ve-
hicle won’t start.
Disconnect the primary of the
ignitioncoilorthedistributorpick-
up coil or the cam/crank sensor
to disable the ignition system.
Refer to vehicle service manual
for disabling procedure.
2. Insert BLACK test lead into
COM test lead jack.
3. Insert RED test lead into
test lead jack.
4. Connect test leads.
Refer to Typical Cranking Volt-
age Loss Circuit (Fig. 20).
•
Connect RED and BLACK test
leads alternately between 1 & 2,
2 & 3, 4 & 5, 5 & 6, 6 & 7, 7 & 9,
8 & 9, and 8 & 10.
RedBlack
Fig. 20Typical Cranking Voltage
Loss Circuit
Solenoid
This is a representative
sample of one type of
cranking circuit. Your vehicle
may use a different circuit
with different components or
locations. Consult your
vehicle service manual.
Starter
Voltage Drops
This test measures the voltage drop across wires, switches, cables, solenoids,
and connections. With this test you can find excessive resistance in the starter
system. This resistance restricts the amount of current that reaches the starter
motorresultinginlowbatteryloadvoltageandaslowcrankingengineatstarting.