Kaise SK-8402 User manual

SK -8402
Instruction Manual
SK-8402 取扱説明書（英文）表1
O2SENSOR CHECKER

CONTENTS
Thank you for purchasing KAISE "SK-8402 O2 SENSOR CHECKER".To obtain the maximum performance of
this instrument, read this Instruction Manual carefully, and take safe measurement.
SAFETY PRECAUTIONS
OPERATING PRECAUTIONS
FEATURES
UNPACKING AND INSPECTION
NAME ILLUSTRATION
SPECIFICATIONS
1. General Specifications
2. Measurement Specifications
3. LCD Specifications
4. SimulationTest
BEFORE USE
1.Types of O2 Sensors
2. Battery Installation
3. Confirmation of O2 Sensor Cables
4. Colors of O2 Sensor Cables
PREPARATION FOR USE
1. Inspection of Check Harness and
Test Lead
2. Check Harness Connection
BASIC CONNECTION DIAGRAM
NORMALTEST
1. Measurement Flow Chart
2. Measurement Procedure with
Check Harness
3. Measurement Procedure with
Test Pin
SIMULATIONTEST
MAINTENANCE
1. Battery Replacement
2. Periodical Check and Calibration
TROUBLE SHOOTING
WARRANTY
1〜5
6〜7
10
8
9
11〜12
13〜14
13
14
15
16
17
17
24
25〜31
32〜33
34〜38
39
39
41
23
SK-8402 取扱説明書（英文）表2
INTRODUCTION
40
21〜22
18〜20

SK-8402 取扱説明書（英文）_P1
SAFETY PRECAUTIONS (strict observance is required)
1
This instruction manual contains the important contents to prevent harm to user or others and damage of
property, and to use the instrument safely and correctly.
Read this manual carefully and obey the contents after having understand the following terms and symbols.
■The points where the following symbols are attached in this manual describe the degree of harm and
damage that would be caused by incorrect usage due to neglect of this description.
WARNING
CAUTION
This symbol in this manual advises the user of an electrical shock
hazard that could result in serious injury or even death.
This symbol in this manual advises the user of an electrical shock
hazard that could cause injury or material damages.
■The points where the following symbols are attached in this manual describe the matters which must obey
in accordance with the each meanings. (following symbols are some examples.)
This symbol shows the warnings and cautions.
This symbol shows the prohibited matters.
This symbol shows the matters that is forced to do.

2
SK-8402 取扱説明書（英文）_P2
SAFETY PRECAUTIONS (strict observance is required)
WARNING
Be careful about your hands, gloves and clothes not to be caught in the engine belt or cooling fan.
Important to prevent injury.
Do not to touch the heated part of the engine such as exhausting parts.
Important to prevent burn injury.
Be careful not to catch your feet in the test leads.
Important to prevent injury.
Confirm that the shift lever is set to "Parking" position (set to "Neutral" for stick shift car).
The car runs accidentally and could cause unexpected accident, electric shock, or damage
to the instrument or the car.
Confirm that the parking brake is applied.
The car runs accidentally and could cause unexpected accident, electric shock, or damage
to the instrument or the car.
Take the measurement or its preparation under well-ventilated environment.
Carbon monoxide poisoning may occur due to the engine running during the measurement.
Use the "car lift" when lifting the car for measurement preparation.
Important to prevent any accident.
Use the supplied test leads and cables when taking the measurement.
Important to prevent any accident, electric shock, or damage to the instrument or the car.

SK-8402 取扱説明書（英文）_P3
3
SAFETY PRECAUTIONS (strict observance is required)
WARNING
Do not drive the car keeping the instrument connected.
Unexpected accident, electric shock, fire, or damage to the instrument or the car may occur.
Do not work under the car when it is jacked up.
Unexpected accident may occur.
Do not open the battery cover keeping the instrument connected to the car.
Electric shock may occur.
Do not replace the battery with the wet hands.
Electric shock may occur.
Keep the instrument away from babies or children.
Important to prevent any accident, injury, or electric shock hazard.
Do not work in the dark place.
Unexpected accident, electric shock, fire, or damage to the instrument or the car may occur.
Do not point the tip of Test Pin or Check Harness at the person.
Loss of eyesight or injury may occur.
Do not get the instrument wet.
Fire or electric shock may occur.

4
SK-8402 取扱説明書（英文）_P4
Do not attempt to disassemble or modify the instrument.
Fire, electric shock, or damage to the instrument may occur.
Do not use the instrument if it is in the abnormal condition.
Stop using the instrument immediately and consult with your local dealer when recognizing
smoke, strange smell, or abnormal noise.
Using the faulty instrument may cause the unexpected accident, fire, or electric shock.
Do not use theTest Lead or Check Harness with which coating were damaged by heat.
Fire or electric shock may occur.
SAFETY PRECAUTIONS (strict observance is required)
WARNING
Do not use the faulty instrument that can recognize such as display trouble, switch failure.
Stop using the instrument immediately and consult with your local dealer.
Using the faulty instrument may cause the unexpected accident, fire, or electric shock.

SK-8402 取扱説明書（英文）_P5
5
SAFETY PRECAUTIONS (strict observance is required)
CAUTION
Be careful about the instrument or the cables not to be caught in the engine belt or cooling fan.
Short circuit or wire breaking may occur that could cause unexpected accident, electric shock,
or damage to the instrument or the car.
Be careful about the instrument or the cables not to touch the heated part of the engine
such as exhausting parts.
Important to prevent any accident, electric shock, or damage to the instrument or the car.
Do not use this instrument for a purpose other than O2 Sensor measurement.
Unexpected accident or damage to the instrument may occur.
Do not use any battery that have wrong rated specification.
Fire, injury, or damage to the surroundings may occur due to battery explosion or leakage.
Install the battery with the correct polarity as shown in the plus○＋ and minus○− indications.
Installing with wrong polarity may cause fire, injury, or damage to the surroundings due to
battery explosion or leakage.
Do not heat or disassemble the battery. Do not put the battery into the fire or water.
Fire or injury may occur due to battery explosion or leakage.
Dispose the exhausted battery in accordance with the local government rule after applying
adhesive tape to both electrodes for insulation.
Disposing the battery with other conductive materials such as metal pieces may cause
the fire or battery explosion due to their short circuit.

SK-8402 取扱説明書（英文）_P6
6
OPERATING PRECAUTIONS
●SK-8402 is the O2 Sensor Checker for the O2 sensor of Zirconia, Titania 1V and Titania 5V. SK-8402 can not check
deterioration judgment of A/F (air-fuel ratio) Sensor or Rear O2 Sensor.
●Check object of this instrument is O2 sensor unit only. If the other parts are defective, engine trouble might not be
solved even if the O2 sensor is replaced.
●To obtain the stable measurement, keeping the engine speed at approx. 2,500rpm for 3 to 4 minutes to warm up the O2
sensor is necessary. When measuring the car without tachometer, estimate the engine speed by its sound. Keeping the
constant engine speed at approx. 2,500rpm is also necessary during the normal test mode.
●Scanning tool which can live monitor of ECU control is required to check ECU in simulation test.
●Error code is memorized in Engine Control Unit (ECU) when taking off the connector of O2 sensor with the ignition key
switch is activated and the engine is running. Error code must be deleted by using the Code Reader or equivalent tool
to prevent any engine troubles.
●Do not apply any oil to Input Terminal, Test Lead, Check Harness, Alligator Clip or metal part of Test Pin to prevent
contact failure.
●Do not polish the case with the fluid that contains alcohol to prevent the cracking.
●Use this instrument under the environment of 0℃to 40℃, 80％RH or less to obtain the accurate measurement.
●Test Lead or Check Harness that coating are heat damaged might cause the short circuit. Do not use them and replace
into the new ones.
●Measurement by using the Test Pin might weaken the waterproof property of the connectors of O2 sensor and ECU.
Wrap heat-resistance/waterproof tape around them after taking the measurement.
●Remove the batteries when the instrument is out of use for a long time.The exhaust battery might leak electrolyte and
corrode the inside.

SK-8402 取扱説明書（英文）_P7
7
OPERATING PRECAUTIONS
Cautions for Handling
●Do not apply mechanical shock.
The shock such as dropping or beating might
damage the instrument and may cause the trouble.
●Do not pull cables forcibly.
Pulling the cables forcibly, such as when removing
the plugs from terminal, may cause the cable
disconnection.
●It might cause the instrument trouble if taking the
simulation test with mischoice the type of O2
sensor (zirconia, titania 1V or titania 5V).
●Do not take the simulation test for heater cable or
power supply cable during the electric car
components are activated. It may damage to the
instrument.
Cautions for safekeeping
●Do not keep the instrument in the following place.
・The place where has the water splash
・The place where applies the hard shock
・-20℃or less, 60℃or more, 70%RH or more
・The place where has the condensation
・The place where is exposed to direct sunlight

SK-8402 取扱説明書（英文）_P8
8
FEATURES
●Deterioration level of O2 sensor can be checked
easily by bar-graph.
●O2 sensor signal can be measured directly without
changing the present exhaust system.
●Simulated sensor signal output is possible that is
useful for checking wiring error or ECU control
with a combination of scanning tool.
●Rich, Lean, Average voltages and Cycle are
displayed respectively.
mV
RICH
TEST Z
APO
GOOD CHECK BAD
mV
RICH
TEST Z
APO
GOOD CHECK BAD
GOOD
(No problem)
mV
RICH
TEST Z
APO
Rich voltage
mV
TEST Z
AVG
APO
Average voltage
mV
TEST Z
LEAN
APO
Lean voltage
C
TEST Z
APO
Cycle
CHECK
replacement
recommended
BAD
replacement
required
mV
RICH
TEST Z
GOOD CHECK BAD
APO
(
)
(
POWER
(1Sec<)
S
(1Sec<)
(Test)
O2
SENSORCHECKER
DH
T5
T1
Z
RICH
LEAN
DISPLAY
TEST
SK-8402
TESTSEL
GOODCHECKBAD
V
RICH
TESTZS
APO
)

SK-8402 取扱説明書（英文）_P9
9
UNPACKING AND INSPECTION (Check before use)
Confirm if the following items are contained in the package in good condition.
If there are any damages or missing items, ask your local dealer for replacement.
①O2 Sensor Checker…1pce. ②Test Lead (100-65)…1pce. ③Check Harness (911)…1pce.
④Alligator Clip (947)…1pce. ⑤Test Pins: Red & Black (795)
…1pce. each
⑥Carrying case (1030)…1pce.
⑦Batteries (manganese 1.5V R6P, AA)
…2pcs.
⑧Instruction Manual…1pce.
・Use parts numbers that are listed along with the
parts names when ordering them for replacement.
・Use commercially available batteries for replacement.
POWER
(1Sec<)
S
(1Sec<)
(Test)
O2SENSOR CHECKER
DH
T5 T1
Z
RICH LEAN
DISPLAY
TEST
SK-8402
TEST SEL
C
mV
AUTO DH
RICH
TEST Z
T1 T5 S
AVG
LEAN
APO
GOOD CHECK BAD

POWER
(1Sec<)
S
(1Sec<)
(Test)
O2SENSOR CHECKER
DH
T5 T1
Z
RICH LEAN
DISPLAY
TEST
SK-8402
TEST SEL
C
mV
AUTO DH
RICH
TEST Z
T1 T5 S
AVG
LEAN
APO
GOOD CHECK BAD
SK-8402 取扱説明書（英文）_P10
10
NAME ILLUSTRATION
Input
Terminal
(＋)
Input
Terminal
(−)
LCD
TEST Key
①Press this key for 1 second or more to start the normal test.
②Press this key for 2 seconds or more to finish the normal test.
③Press this key less than 1 second to change the display mode
during the normal test. (this function is available when " "
lights up)
④Press this key to output simulated signal in the simulation test
mode.
DH
SEL Key (SELECT Key)
①In stand-by mode…Press this key less than 1 second to select the
types of O2 sensor.
②In stand-by mode…Press this key for 1 second or more to change
testing mode (normal test or simulation test).
③In simulation test…Press this key less than 1 second to change
RICH test or LEAN test.
④Display Hold
Press this key less than 1 second during normal test mode to
hold display value on LCD.(" " lights up)
To Cancel : Press SEL Key for 1 second or more.
DH
POWER Key
①Press this key for 1 second or more
to turn on/turn off the unit.
●O2 Sensor Checker
Power turns off automatically after approx. 20 minutes of the last key operation.
Note : Less than 2 μ A is consumed even in the power off condition.
To cancel : Turn on the unit holding down SEL Key. ("APO" disappears
from LCD)
Auto Power Off (this function is activated in default setting)

⊿ΣConversion
Input voltage calculation by microprocessor
500 times/second (LCD : 1 time/second in stand-by mode)
a. Numerical Display: LCD 999 count, 13 segment bar graph
b. Units and Symbols: TEST, AUTO, , DH, Z,T1,T5, S, RICH, LEAN,AVG,APO, C, m,V, ▲
within 1 second (in stand-by mode)
Auto range (range-up)
0℃to 40℃, 80％RH or lower (in non-condensing)
-20℃to 60℃, 70％RH or lower (in non-condensing)
Add ×0.01/℃to the accuracy outside 23℃±5℃
"H" display on LCD when 6V or more is input (same display for overflow indication)
"- - -" display on LCD when + side of input terminal is grounded (only in stand-by mode)
"- - -" display on LCD when input is less than threshold (same as grounding indication)
"Err" display on LCD when minus voltage is input between input terminals
Err (error) : Indication of minus voltage input
"OL" blinks on LCD and stop testing when over current is detected during the
simulation test
OL (Over Load) : Warning indication of over current input
SK-8402 取扱説明書（英文）_P11
11
SPECIFICATIONS
1. General Specifications
OPERATING PRINCIPLE
TEST METHOD
SAMPLING RATE
DISPLAY (LCD)
RESPONSETIME
RANGE SELECTION
OPERATING TEMPERATURE & HUMIDITY
STORAGETEMPERATURE & HUMIDITY
TEMPERATURE COEFFICIENT
OVERVOLTAGE INDICATION
GROUNDING INDICATION
OPEN-INPUT INDICATION
REVERSE CONNECTION
WARNING
OVER CURRENT PROTECTION
１.
２.
３.
４.
５.
６.
７.
８.
９.
１０.
１１.
１２.
１３.
１４.

SK-8402 取扱説明書（英文）_P12
12
SPECIFICATIONS
sign starts blinking when the battery voltage becomes at approx. 2.5V.
Simulation test should be stopped when it is detected.
sign blinks on LCD at approx. 2.4V or less.
1.5V R6P or LR6(AA) batteries ×2
Hold LCD display by pressing SEL Key (effective in normal test mode)
Power turns off automatically after approx. 20 minutes of the last key operation. (cancelable)
Approx. 2.5V or more and 3.6V or less
10ｍA or less in normal test mode (approx. 2 μ A or less in power-off mode)
300mVA MAX (in simulation test mode)
Approx. 80 hours (manganese battery)
Approx. 180 hours (alkaline battery)
1.1kV 50Hz sine wave, for 1 minute (between circuit and case)
CE marking approved. (IEC61010-1 CATⅠ600V class2)
148(H)×83(W)×33(D)mm, approx. 220g
BATTERYWARNING
POWER SUPPLY
DISPLAY HOLD
AUTO POWER OFF
OPERATING POWER SUPPLYVOLTAGE
POWER CONSUMPTION
MAXIMUM MOMENTARY POWER CONSUMPTION
CONTINUOUS OPERATING TIME
(in normal test mode)
DIELECTRIC STRENGTH
SAFETY LEVEL
DIMENSION &WEIGHT
(accessories are not included)
１５.
１６.
１７.
１８.
１９.
２０.
２１.
２２.
２３.
２４.
２５.
※Product specifications and appearance are
subject to change without notice.

SK-8402 取扱説明書（英文）_P13
13
SPECIFICATIONS
2. Measurement Specifications
(23℃±5℃、80％RH or lower, in non-condensing)
※"- - -" display when the cycle value is unable to be measured.
※"OL" display when the input exceeds the maximum effective
input value.
OL (Over Load) :Warning indication of over input
Range
10.0C
Accuracy
±1%rdg±2dgt (from 0.2C)
Resolution
0.1C
Max. effective input
10.0C
3. LCD Specifications
(23℃±5℃、80％RH or lower, in non-condensing)
Measurement displays (testing sign : TEST)
①RICH display : Maximum value of O2 sensor output for 10
seconds intervals with "RICH" sign.
②LEAN display: Minimum value of O2 sensor output for 10
seconds intervals with "LEAN" sign.
③AVG display: Average value of O2 sensor output for 10
seconds intervals with "AVG" sign.
④Cycle display: cycle variability numbers between RICH
and LEAN of O2 sensor for 1 second.
C
mV
AUTO DH
RICH
TEST Z
T1 T5 S
AVG
LEAN
APO
BAD
Replacement
required
CHECK
Replacement
recommended
GOOD
(No problem)
※The unit works as DC Voltage Meter (6V max.) before
pressingTEST Key.
※Goes down to 999mV range at less than 95 count.
※Goes up to 6V range at 1000 count or more in 999mV range.
※Threshold value of "- - -" display : within ±50mV input.
(in stand-by mode)
※Threshold value of "Err" display : -51mV input or less.
Range
999mV
6.00V
Accuracy
0 to 200mV：±1.5%rdg±10dgt
201 to 999mV：±1.5%rdg±5dgt
±1.5%rdg±5dgt
Resolution
1mV
10mV
：Lights up when the test is activated
：Lights up when auto display mode is selected
：Blinks in low battery voltage
：Lights up in display hold function
：Lights up when Zirconia sensor is selected
：Lights up whenTitania 1V sensor is selected
AUTO
DH
TEST
Z
T1
(
)
(
)

SK-8402 取扱説明書（英文）_P14
14
SPECIFICATIONS
● Zirconia &Titania 1V
(sensor impedance : 100Ωor more at 23℃Typ)
※Output following voltage by pressingTEST Key.
①RICH mode : 0.8V Min. to 1.3V Max.
②LEAN mode : approx. 0V
● Titania 5V
(sensor impedance : 500Ωor more at 23℃Typ)
※Output following voltage by pressingTEST Key.
①RICH mode : 4.7V Min. to 5.3V Max.
②LEAN mode : approx. 0V
4. SimulationTest (testing sign:TEST)
・3 seconds signal output for each test.
・3 seconds interval is necessary for each test. Continuous
testing is not possible.
・Simulation test should be stopped and changed into stand-
by mode when battery voltage becomes 2.5V or less.
・Simulation test mode is not activated when the battery
voltage becomes 2.5V or less.
・Simulation test mode is not activated when the test
voltage in stand-by mode is lower than the threshold
("Err" display).
・Simulation test mode is not activated when the test
voltage in stand-by mode is higher than the threshold
("H" display).
・Simulation test is stopped and "OL" blinks on LCD when
the over current is detected.
OL (Over Load) :Warning indication of over current input
・Sensor Impedance of detected threshold
・Zirconia and Titania 1V sensor : sensor impedance
approx. 100Ωor less 23℃Typ
・Titania 5V sensor : sensor impedance approx. 500Ωor
less 23℃Typ
・The unit cannot be turned off during the simulation test.
●LCD display
①In RICH test : blinks.
②In LEAN test : blinks.
RICH
LEAN
：Lights up whenTitania 5V sensor is selected
：Lights up when simulation test mode is selected
： Lights up or blinks when RICH voltage is displayed
or RICH voltage output is selected 
： Lights up or blinks when LEAN voltage is displayed
or LEAN voltage output is selected
：Lights up when AVG voltage is displayed
：Lights up when auto power off is activated
：Lights up when cycle display mode is selected
：Auxiliary unit in voltage display (mV)
：Unit of voltage display
：Test result is shown as bar graph (lighting or blinking)
：Test result separator in bar graph
C
m
V
RICH
T5
S
AVG
LEAN
APO
Bargraph

SK-8402 取扱説明書（英文）_P15
15
Zirconia O2 Sensor This instrument cannot display the deterioration
level of A/F (air-fuel ratio) sensor on bar graph.
Zirconia O2 Sensor was launched to clean the exhaust gas of the
car, efficiency was improved year by year, and it is the most
typical sensor type now. Zirconia O2 Sensor generates electricity
by itself and provides an output voltage corresponding to a
quantity of residual oxygen in exhaust gas.
Titania O2 Sensor
Titania O2 sensor has two types: titania 1V O2 sensor and
titania 5V O2 sensor. In the past, there was the car model that
was equipped titania O2 sensor instead of zirconia O2 sensor,
but it is not popular now. The resistance value of titania O2
sensor is changed corresponding to a quantity of residual
oxygen in exhaust gas, therefore supplying external power
supply voltage is necessary for titania sensor to obtain the
output signal.
Correct knowledge about the O2 sensor types are necessary to use this instrument properly.
This instrument is suitable for deterioration check for zirconia O2 sensor and titania 1V/5V O2 sensors.
Confirm the type of the target O2 sensor with your own vehicle maintenance manual.
BEFORE USE
Zirconia O2 sensor
Catalyst
●A/F (air-fuel ratio) sensor :
A/F sensor tends to be equipped to fuel-efficient car or
low exhaust car recently. O2 sensor can recognize only a
change of signal between "rich mixture" (low in remaining
oxygen) and "lean mixture" (high in remaining oxygen),
but A/F sensor can output the fluctuating signal of A/F
linearly every moment.
The number of wiring for the dual cell type A/F sensor is
five or more.
This instrument cannot display the deterioration
level of Rear O2 Sensor on bar graph.
● Rear O2 Sensor :
Rear O2 Sensor is equipped behind the catalyst to check
the condition of 3-way catalyst. Sensor in itself is the same
as O2 sensor equipped in manifold side, but the waveform
of output signal is different. If the measurement result of
rear O2 sensor and manifold side O2 sensor are almost the
same, the exhaust gas would not be purified by 3-way
catalyst and there would be some problems in the exhaust
system.
1.Types of O2 Sensors

BEFORE USE
SK-8402 取扱説明書（英文）P16
16
●To prevent electric shock, detach the instrument from
the measuring object and turn it off before installing
or replacing the battery.
●To prevent electric shock, do not replace the battery
with wet hands.
WARNING
●Do not use any battery that have wrong rated
specification. It may cause any accidents due to
explosion or leakage.
●Install the battery with the correct polarity as shown in
the plus○＋ and minus○− indications. Installing battery
with wrong polarity may cause any accidents due to
explosion or leakage.
●To prevent any accidents, dispose the exhausted
battery in accordance with the local government rule
after applying adhesive tape to both electrodes for
insulation.
●Do not heat or disassemble the battery. Do not put
them into the fire or water. It may cause any
accidents due to explosion or leakage.
CAUTION
2. Battery Installation
①Loosen a screw of battery cover and open it.
Then, insert attached 2 pcs of batteries with the
correct polarity as shown in the plus○＋ and minus
○− indications.
②Fix battery cover and tighten up a screw.
NOTE : Pull the screw when the battery cover is
hard to be opened.
Install attached batteries before using the instrument.
Insert attached two 1.5V
R6P batteries in correct
polarity.
1.5V R6P
1.5V R6P
Battery
Cover
Lift up the battery
cover with pulling
the loosened screw.
Screw
Screw

SK-8402 取扱説明書（英文）_P17
17
3. Confirmation of O2 Sensor Cables 4. Colors of O2 Sensor Cables
①O2 sensor without heater : 1 cable
(sensor signal cable)
②O2 sensor without heater : 2 cables
(sensor signal cable, sensor earthing cable)
③O2 sensor with heater : 3 cables
(sensor signal cable, heater cable x 2 【same color】)
④O2 sensor with heater : 4 cables
(sensor signal cable, sensor earthing cable, heater cable x 2 【same color】)
BEFORE USE
Types and Numbers of Zirconia O2 Sensor Cables
①3 cables
(sensor signal cable, earthing cable, power supply cable)
Types and Numbers ofTitania O2 Sensor Cables
●Harness cable colors of Example 1 in the table above
White : Heater cable x 2
(same color)
Gray : Sensor earthing cable (−)
Black : Sensor signal cable (＋)
Example 1
Example 2
Example 3
Example 4
Black
Purple
Blue
White
Gray
Light Brown
White
Green
White
Dark Brown
Black
Black
Sensor signal
cable (＋)
Sensor earth-
ing cable (−)Heater cable (2 cables)
Zirconia O2 sensor
Example 1 Black White Red
Sensor signal
cable (＋)
Earthing cable
(−)
Power supply
cable
Titania O2 sensor
※Cable colors between O2 sensor and the connector.
Not the cable colors of ECU side connector.
O2 sensor is equipped nearby the engine exhaust part where
should have very high temperature. Do not start the
measurement just after the engine stopped and wait until it
is cooled down.
WARNING
Error code is memorized in ECU when taking off the connector
of O2 sensor with the engine is running and the electric car
components are activated. Delete the error code by using the
Code Reader to prevent any engine troubles.
CAUTION

PREPARATION FOR USE
SK-8402 取扱説明書（英文）_P18
18
1. Inspection of Check Harness andTest Lead
●Inspection forTest Lead
①Connect red and black L-shaped plugs of the test
lead to red (＋) and black (−) input terminals.
②Connect red and black test pins to the red and
black straight plugs respectively.
Inspect whether test lead and check harness are not
disconnected in accordance with the following procedures.
Red test lead L-shaped plug
Black test lead
straight plug
Red test lead
straight plug
Black test pin
Red test pin
Black test lead L-shaped plug
③Press POWER Key for 1 second or more to turn on
the instrument. It enters stand-by mode for cable
connection check.
④Press SEL Key for 1 second or more to enter
simulation test mode for zirconia O2 sensor.
lights up on LCD.
S
⑤Press TEST Key for 1 second or less with short-
circuiting red and black test pins to output RICH
signal.
RICH
ZS
APO
PressTEST Key for 1 second or less with contacting
the tips of red and black test pins.
O2SENSOR CHECKER
SK-8402
TEST SEL