Actron CP7665 User Manual
OPERATING
INSTRUCTIONS
Index
Safety Precautions .................................. 2
Vehicle Service Information .................... 3
Visual Inspection ..................................... 3
Electrical Specifications ........................ 32
Warranty ................................................ 96
1. Multimeter Basic Functions
Functions and Display Definitions ...... 4
Setting the Range ............................... 6
Battery and Fuse Replacement.......... 7
Measuring DC Voltage........................ 8
Measuring AC Voltage........................ 8
Measuring Resistance ........................ 9
Measuring DC Current......................10
Testing Diodes .................................. 11
Testing B at te ri es ...............................1 2
2. Automotive Testing with the CP7665
General Testing................................. 13
-Testing Fuses ................................. 13
-Testing Switches.............................13
-Testing Solenoids and Relays........ 14
CP7665
Starting / Charging System Testing .15
- No Load Battery Test ......................15
- Engine Off Battery Current Draw ...16
-
Cranking Voltage/Battery Load Test .
- Voltage Drops .................................18
- Charging System Voltage Test ...... 19
Ignition System Testing ....................21
- Ign it io n Co il T es ti n g ........................21
- Ignition System Wires .....................23
- Magnetic Pick-Up Coils ..................24
- Reluctance Sensors........................24
Fuel System Testing ......................... 25
-
Measuring Fuel Injector Resistance..
Testing Engine Sensors.................... 27
- Oxygen (O
- Temperature Type Sensors ............29
- Position Type Sensors –
Throttle and EGR Valve Position,
Vane Air Flow.................................. 30
Instrucciones en español .... 33
Instructions en français ....... 65
1
) Type Sensors............. 27
2
17
25
SAFETY GUIDELINES
TO PREVENT ACCIDENTS THAT COULD RESULT IN SERIOUS
INJURY AND/OR DAMAGE TO YOUR VEHICLE OR TEST
EQUIPMENT, CAREFULLY FOLLOW THESE SAFETY RULES AND
TEST PROCEDURES
• Always wear approved eye
protection.
• Always operate the vehicle in a
well ventilated area. Do not inhale
exhaust gases – they are very
poisonous!
• Always keep yourself, tools and
test equipment away from all
moving or hot engine parts.
• Always make sure the vehicle is in
park (Automatic transmission) or
neutral (manual transmission) and
that the parking brake is firmly
set. Block the drive wheels.
• Never lay tools on vehicle battery.
You may short the terminals
together causing harm to yourself,
the tools or the battery.
• Never smoke or have open flames
near vehicle. Vapors from gasoline
and charging battery are highly
flammable and explosive.
• Never leave vehicle unattended
while running tests.
• Always keep a fire extinguisher
suitable for gasoline/electrical/
chemical fires handy.
• Always use extreme caution when
working around the ignition coil,
distributor cap, ignition wires, and
spark plugs. These components
contain High Voltage when the
engine is running.
• Always turn ignition key OFF
when connecting or disconnecting electrical components, unless
otherwise instructed.
• Always follow vehicle
manufacturer’s warnings,
cautions and service procedures.
CAUTION:
Some vehicles are equipped with safety air bags. You
service manual cautions when working around the air bag components or
wiring. If the cautions are not followed, the air bag may open up unexpectedly, resulting in personal injury. Note that the air bag can still open up
several minutes after the ignition key is off (or even if the vehicle battery is
disconnected) because of a special energy reserve module.
must
follow vehicle
All information, illustrations and specifications contained in this manual are based on the latest
information available from industry sources at the time of publication. No warranty (expressed or
implied) can be made for its accuracy or completeness, nor is any responsibility assumed by Actron
Manufacturing Co. or anyone connected with it for loss or damages suffered through reliance on
any information contained in this manual or misuse of accompanying product. Actron Manufacturing Co. reserves the right to make changes at any time to this manual or accompanying product
without obligation to notify any person or organization of such changes.
2
Vehicle Service Manual – Sources For Service
Information
The following is a list of sources to obtain vehicle service information for your
specific vehicle.
• Contact your local Automotive Dealership Parts Department.
• Contact local retail auto parts stores for aftermarket vehicle service
information.
• Contact your local library. Libraries often allow you to check-out automotive 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.
• Check sensors and actuators for
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 located in the engine compartment.
- Pinches and kinks.
- Splits, cuts or breaks.
• Inspect wiring for:
- Contact with sharp edges.
- Contact with hot surfaces, such
as exhaust manifolds.
- Pinched, burned or chafed insulation.
- Proper routing and connections.
• Check electrical connectors for:
- Corrosion on pins.
- Bent or damaged pins.
- Contacts not properly seated
in housing.
- Bad wire crimps to terminals.
3
Section 1. Multimeter Basic Functions
Digital multimeters or DMMs have many special features and functions. This
section defines these features and functions, and explains how to use these
functions to make various measurements.
1
11
5
3
8
4
6
Functions and Display Definitions
1. ROTARY SWITCH
Switch is rotated to turn multimeter
ON/OFF and select a function.
2. DC VOLTS
This function is used for measuring DC (Direct Current) Voltages in
the range of 0 to 500V.
3. OHMS
This function is used for measur-
ing the resistance of a component
in an electrical circuit in the range
of 0.1Ω to 20MΩ. (Ω is the electrical symbol for Ohms)
4.
DIODE CHECK
This function is used to check
whether a diode is good or bad.
5. HOLD
Press HOLD button to retain data
4
10
2
7
9
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.
RED Test Lead is inserted in the jack corresponding to the multimeter rotary switch setting.
Always connect TEST LEADS to the
multimeter before connecting them
to the circuit under test!!
DC AMPS
DC VOLTS AC VOLTS
OHMS DIODES
1.5V, 9V and 12V
BATTERY TESTS
7. AC VOLTS
This function is used for measuring AC Voltages in the range of 0
to 500V.
8. DC AMPS
This function is used for measuring DC (Direct Current) Amps in
the range of 0 to 10A.
9. 1.5V, 9V, AND 12V BATTERY
TEST
This function is used to test 1.5V,
9V, and 12V batteries under
load.
10. DISPLAY LIGHT
Press button to illuminate the display.
11. DISPLAY
Used to display all measurements
and multimeter information.
Low Battery – If this symbol appears in the lower left corner of the
display, then replace the internal
9V battery. (See Fuse and Battery
replacement on
page 7.)
High Voltage
indicator
Overrange Indication – If “1” or “-
1” appears on the
left side of the display, then the multimeter is set to a
range that is too
small for the
present measure-
ment being taken.
Increase the range until this disappears. If it does not disappear after
all the ranges for a particular function have been tried, then the value
being measured is too large for the
multimeter to measure. (See Setting the Range on page 6.)
Zero Adjustment
The multimeter will automatically zero
on the Volts, Amps and Battery Test
functions.
Automatic Polarity Sensing
The multimeter display will show a minus
(-) sign on the DC Volts and DC Amps
functions when test lead hook-up is reversed.
5
Setting the Range
Two of the most commonly asked
questions about digital multimeters
are What does Range mean? and
How do I know what Range the multimeter should be set to?
Fig. 2
What Does Range mean?
Range refers to the largest value
the multimeter can measure with
the rotary switch in that position. If
the multimeter is set to the 20V DC
range, then the highest voltage the
multimeter can measure is 20V in
that range.
EXAMPLE: Measuring Vehicle Battery Voltage (See Fig. 1)
Fig. 1
Red
Let’s assume the multimeter is connected to the battery and set to the
20V range.
The display reads 12.56. This means
there is 12.56V across the battery
terminals.
Now assume we set the multimeter
to the 2000mV range. (See Fig. 2)
The multimeter display now shows
a “1” and nothing else. This means
the multimeter is being overranged
or in other words the value being
measured is larger than the current
range. The range should be increased until a value is shown on
Black
Red
Black
the display. If you are in the highest
range and the multimeter is still
showing that it is overranging, then
the value being measured is too
large for the multimeter to measure.
How do I know what Range the
multimeter should be set to?
The multimeter should be set in the
lowest possible range without
overranging.
EXAMPLE: Measuring an unknown
resistance
Let’s assume the multimeter is connected to an engine coolant sensor
with unknown resistance. (See Fig. 3)
Start by setting the multimeter to the
largest OHM range. The display
reads 0.0Ω or a short circuit.
Fig. 3
Red
Black
6
Fig. 4
Fig. 5
Fig. 6
This sensor can’t be shorted so reduce the range setting until you get
a value of resistance.
At the 200KΩ range the multimeter
measured a value of 4.0. This means
there is 4KΩ of resistance across
the engine coolant sensor terminals. (See Fig. 4)
If we change the multimeter to the
20KΩ range (See Fig. 5) the display shows a value of 3.87KΩ. The
actual value of resistance is 3.87KΩ
and not 4KΩ that was measured in
the 200KΩ range. This is very important because if the manufacturer
specifications say that the sensor
should read 3.8-3.9KΩ at 70°F then
on the 200KΩ range the sensor
would be defective, but at the 20KΩ
range it would test good.
Now set the multimeter to the 2000Ω
range. (See Fig. 6) The display will
indicate an overrange condition because 3.87KΩ is larger than 2KΩ.
This example shows that by decreasing the range you increase the
accuracy of your measurement.
When you change the range, you
change the location of the decimal
point. This changes the accuracy of
the measurement by either increas-
ing or decreasing the number of
digits after the decimal point.
Battery and Fuse
Replacement
Important: A 9 Volt battery must be
installed before using the digital multimeter. (see procedure below for
installation)
Battery Replacement
1. Turn multimeter rotary
switch to OFF position.
2. Remove test leads from
multimeter.
3. Remove screws from back of
multimeter.
4. Remove back cover.
5. Install a new 9 Volt battery.
6. Re-assemble multimeter.
Fuse Replacement
1. Turn multimeter rotary
switch to OFF position.
2. Remove test leads from
multimeter.
7
3. Remove screws from back of
multimeter.
4. Remove back cover.
5. Remove fuse.
6. Replace fuse with same size
and type as originally
installed!
5mm x 20mm, 200mA, 250V,
fast acting.
7. Re-assemble multimeter.
Measuring DC Voltage
This multimeter can be used to measure DC voltages in the range from 0
to 500V. You can use this multimeter
to do any DC voltage measurement
called out in the vehicle service
manual. The most common applications are measuring voltage drops,
and checking if the correct voltage
arrived at or is being produced by a
sensor or a particular circuit.
To measure DC Voltages (see Fig. 7):
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 positive (+) side of voltage source.
4. Connect BLACK test lead to
Fig. 7
negative (-) side of voltage
source.
NOTE: If you don’t know which
side is positive (+) and which
side is negative (-), then arbitrarily connect the RED test lead
to one side and the BLACK to
the other. The multimeter automatically senses polarity and will
display a minus (-) sign when
negative polarity is measured. If
you switch the RED and BLACK
test leads, positive polarity will
now be indicated on the display.
Measuring negative voltages
causes no harm to the multimeter.
5. Turn multimeter rotary switch
to desired voltage range.
If the approximate voltage is unknown, start at the largest voltage
range and decrease to the appropriate range as required. (See
Setting the Range on page 6)
6. View reading on display - Note
range setting for correct units.
NOTE: 200mV = 0.2V
Measuring AC Voltage
This multimeter can be used to measure AC voltages in the range from
0 to 500V.
To measure AC Voltages (see Fig. 8):
Red
Black
Fig. 8
Red
Black
8
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
side of voltage source.
4. Connect BLACK test lead to other
side of voltage source.
5. Turn multimeter rotary switch
to desired voltage range.
If the approximate voltage is unknown, start at the largest voltage
range and decrease to the appropriate range as required. (See
Setting the Range on page 6)
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 0.1Ω to 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 6).
You can use this multimeter to do any
resistance measurement called out
in the vehicle service manual. Testing ignition coils, spark plug wires,
and some engine sensors are common uses for the OHMS (Ω) function.
To measure Resistance (see Fig. 9):
1. Turn circuit power OFF.
To get an accurate resistance
measurement and avoid possible
damage to the digital multimeter
and electrical circuit under test,
turn off all electrical power in the
circuit where the resistance measurement is being taken.
Fig. 9
Unknown
Resistance
RedBlack
2. Insert BLACK test lead into
COM test lead jack.
3. Insert RED test lead into
4. Turn multimeter rotary switch
to 200
Touch RED and BLACK multimeter leads together and view
reading on display.
Display should read typically
0.2Ω to 1.5Ω.
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 measurements, polarity is not important. The test leads just have
to be connected across the component.
6. Turn multimeter rotary switch
to desired OHM range.
If the approximate resistance is
unknown, start at the largest OHM
range and decrease to the appropriate range as required. (See
Setting the Range on page 6)
9
test lead jack.
Ω range.
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 resistance 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 resistance measurements less than
10Ω.
Measuring DC Current
This multimeter can be used to measure DC current in the range from 0 to
10A. Unlike voltage and resistance
measurements where the multimeter
is connected across the component
you are testing, current measurements must be made with the multimeter in series with the component.
Isolating current drains and short circuits are some DC Current applications.
Fig. 10
DC
Voltage
Source
Black
Electrical
Device
Red
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"
test lead jack or "mA" test lead
jack.
3. Disconnect or electrically
open circuit where you want
to measure current.
This is done by:
• Disconnecting wiring harness.
• Disconnecting wire from
screw-on type terminal.
• Unsolder lead from component
if working on printed circuit
boards.
• Cut wire if there is no other
possible way to open electrical circuit.
4. Connect RED test lead to one
side of disconnected circuit.
5. Connect BLACK test lead to
remaining side of disconnected circuit.
6. Turn multimeter rotary switch
to 10A DC position, 200mA or
200
µA position.
7. View reading on display.
If minus (-) sign appears on display, then reverse RED and
BLACK test leads.
Fig. 11
DC
Voltage
Source
Black
Electrical
Device
Red
10
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