Kaise SK-8402 Instruction Manual

SK

-8402

Instruction Manual

SK-8402 取扱説明書（英文）表1

O2 SENSOR 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. Simulation Test

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
NORMAL TEST

1. Measurement Flow Chart

2. Measurement Procedure with
Check Harness

3. Measurement Procedure with
Test Pin

SIMULATION TEST
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 the Test 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

(

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(

P

O

W

E

R

(

1

S

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c

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)

S

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S

ec

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O

2

S

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O

R

C

H

E

C

K

E

R

D

H

T5

T

1

Z

R

I

C

H

L

E

AN

DIS

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L

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T

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S

T

S

K

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8

4

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D

C

HEC

K

B

A

D

V

R

I

CH

T

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S

T

Z

S

A

P

O

)

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)

O2 SENSOR CHECKER

DH

T5

T1

Z

RICH

LEAN

DISPLAY

TEST

SK-8402

TEST SEL

C
mV

AUTO

DH

RICH

TEST

ZT1T5

S

AVG

LEAN

APO

GOOD CHECK BAD

POWER

(1Sec<)

S

(1Sec<)

(Test)

O2 SENSOR CHECKER

DH

T5

T1

Z

RICH

LEAN

DISPLAY

TEST

SK-8402

TEST SEL

C
mV

AUTO

DH

RICH

TEST

ZT1T5

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 2μA 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)

RESPONSE TIME
RANGE SELECTION

OPERATING TEMPERATURE & HUMIDITY

STORAGE TEMPERATURE & 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. 2μA 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 CATⅠ 600V class2)

148(H)×83(W)×33(D)mm, approx. 220g

BATTERY WARNING

POWER SUPPLY
DISPLAY HOLD
AUTO POWER OFF
OPERATING POWER SUPPLY VOLTAGE
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

ZT1T5

S

AVG

LEAN

APO

BAD

Replacement

required

CHECK

Replacement

recommended

GOOD

(No problem)

※The unit works as DC Voltage Meter (6V max.) before

pressing TEST 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 when Titania 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 : 100Ω or more at 23℃ Typ)

※Output following voltage by pressing TEST Key.

① RICH mode : 0.8V Min. to 1.3V Max.
② LEAN mode : approx. 0V

●Titania 5V

(sensor impedance : 500Ω or more at 23℃ Typ)

※Output following voltage by pressing TEST Key.

① RICH mode : 4.7V Min. to 5.3V Max.
② LEAN mode : approx. 0V

4. Simulation Test (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. 100Ω or less 23℃ Typ

 ・Titania 5V sensor : sensor impedance approx. 500Ω or

less 23℃ Typ

・ The unit cannot be turned off during the simulation test.

● LCD display

① In RICH test : blinks.
② In LEAN test : blinks.

RICH

LEAN

： Lights up when Titania 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

① 3 cables

(sensor signal cable, earthing cable, power supply cable)

Types and Numbers of Titania 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 earth­ing 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 and Test Lead

●Inspection for Test 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

Z S

APO

Press TEST Key for 1 second or less with contacting
the tips of red and black test pins.

O2 SENSOR CHECKER

SK-8402

TEST SEL

SK-8402 取扱説明書（英文）_P19

19

PREPARATION FOR USE

⑥Test lead wires have good continuity if "OL" blinks

on LCD. Otherwise, they should be disconnected.
This concludes the test lead inspection.

●Inspection for Check Harness

①Connect red and black L-shaped plugs of the test

lead to red (＋) and black (−) input terminals.

②Connect red and black check harness connecting

plugs to the red and black straight plugs respectively.

⑤Short-circuit red and black male connecting

terminals and press TEST Key for 1 second or less
to output RICH signal.

③ Press 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

RICH

Z S

APO

RICH

Z S

APO

Red test lead straight plug

Red check harness
connecting plug

Black test lead straight plug

Black check harness
connecting plug

Press TEST Key for 1 second or less with contacting
the tips of red and black male connecting terminals.

O2 SENSOR CHECKER

SK-8402

TEST SEL

SK-8402 取扱説明書（英文）_P20

20

PREPARATION FOR USE

⑥Red and black check harnesses have good continuity

if "OL" blinks on LCD. Otherwise, either or both of
them should be disconnected.

⑦Press SEL Key for 1 second or more to finish

simulation test mode temporarily. Press SEL Key
again for 1 second or more and enter simulation
test mode once again.

⑧Connect two yellow check harness connecting plugs

to the red and black straight plugs respectively.

⑨Short-circuit two yellow male connecting terminals

and press TEST Key for 1 second or less to output
RICH signal.

⑩Two yellow check harnesses have good continuity

if "OL" blinks on LCD. Otherwise, either or both of
them should be disconnected.
This concludes the check harness inspection.

RICH

Z S

APO

RICH

Z S

APO

Red test lead straight plug

Yellow check harness
connecting plug

Black test lead straight plug

Yellow check harness
connecting plug

Press TEST Key for 1 second or less with contacting
the tips of two yellow male connecting terminals.

O2 SENSOR CHECKER

SK-8402

TEST SEL

SK-8402 取扱説明書（英文）_P21

21

①Confirm that the engine is completely stopped.

(Turn off the engine and electric components)

②Detach connecting couplers of O2 sensor and ECU.

③Connect the couplers of ECU and O2 sensor with

check harnesses.
Signal cables in the couplers should be connected
as follows;

PREPARATION FOR USE

2. Check Harness Connection

Connect check harnesses in accordance with the
following procedures after checking the type of O2 sensor.

Check point

●The colors of signal cables of O2 sensor and
ECU are not the same. Confirm the connecting
direction of the couplers and connect the
proper cables with check harnesses. After
connecting check harnesses, confirm whether
cables are connected correctly.

●If the couplers cannot be connected by check
harness, use test pins (red and black) instead.
Refer to the contents of "Measurement
Procedure with Test Pin" in page 32.

- Sensor signal cable → red cable of check harness

- Sensor earthing cable →black cable of check harness

- Heater cables (two) → yellow cables of check harness

SK-8402 取扱説明書（英文）_P22

22

※Set the connecting couplers in the same direction

and connect the originally connected pins with the
same colored check harnesses as the female
connecting terminals.

PREPARATION FOR USE

Example of check harness connection for "zirconia O2 sensor, example 1" in page 17

Heater cable (white) x 2

Female connecting terminal of check harness (yellow) x 2

Sensor earthing cable (−) (gray)

Female connecting terminal of check harness (black)

Sensor signal cable (＋) (black)

Female connecting terminal of check harness (red)

Connecting coupler for O2 sensor side Connecting coupler for ECU side

Female/Male connecting

terminals (black)

Female/Male connecting terminals (red)

Connecting coupler

for ECU side

Female/Male connecting

terminals (yellow) x 2

●Connect female connecting terminal of check harness.

●Connect male connecting terminal of check harness.

Connecting coupler

for O2 sensor side

SK-8402 取扱説明書（英文）_P23

23

BASIC CONNECTION DIAGRAM

Connection image of zirconia O2 sensor with 4 cables

SK-8402

ECU in vehicle side

Black

Red

Yellow

Yellow

Black Red

O2 sensor

Test lead

Check harness

Connecting coupler
for O2 sensor side

Connecting coupler
for ECU side

Black

Red

SK-8402 取扱説明書（英文）_P24

NO

NO

NO

NO

24

NORMAL TEST

1. Measurement Flow Chart

YES

NO

YES

YES

YES

YES

Start the engine.

Heater

cable or power supply

cable have the proper

voltage?

Is there heater cable

or power supply cable?

Is the test lead con-

nected to the unit?

Is bar graph blinking?

Is A/F sensor or Rear

O2 sensor measuring?

Select O2 sensor type.

Turn on the instrument.

Connect test lead to the instrument.

Check the circuit or connect­ing of heater cable or power
supply cable.

Connect check harness to test lead,
keep constant engine speed at approx.
2,500rpm for a few minutes to warm
up the O2 sensor.

Keep constant engine speed
at approx. 2,500rpm for 30
seconds or more, and measure.

Read the test result by bar graph.

【GOOD】: No problem
【CHECK】: Replacement

recommended

【BAD】: Replacement required

Measurement start

Start normal test.

SK-8402 cannot test with bar graph.

Measurement finished.

CAUTION

Make the necessary inspection prior
to measurement in reference to
Preparation For Use in page 18 to 22.

CAUTION

See page 15 for details about the
types of O2 sensors.

CAUTION

See "Check point" in page 31 for
deta ils ab out t he det eriora te
conditions of the O2 sensor.

CAUTION

This flow chart shows the brief outline of the measurement.
When taking the actual measurement, read the contents
mentioned from next clause (from page 25) carefully.

SK-8402 取扱説明書（英文）_P25

25

NORMAL TEST

①Connect red and black L-shaped plugs of the test

lead to red (＋) and black (−) input terminals
respectively.

②Press POWER Key for 1 second or more to turn on

the instrument. It enters stand-by mode for cable
connection check.

③Press SEL Key for 1 second or less and select the

type of O2 sensor to be measured. Default setting
is zirconia O2 sensor.

※LCD display might be drifting when connecting

the test leads or the cables due to the high input
impedance of this instrument, but does not affect
the measurement.

Check point

Titania O2 sensor always has power supply
cable (red). Confirm it when selecting.

Red test lead L-shaped plug

Black test lead L-shaped plug

mV

Z

APO

2. Measurement Procedure with
Check Harness

SK-8402 取扱説明書（英文）_P26

④Start the engine.

⑤If the zirconia O2 sensor to be measured has heater

cables, make their voltage check. When measuring
titania O2 sensor, make voltage check of its power
supply cable.

※The heater cable has the sufficient voltage even if

"H" display is unstable when checking the heater

cable with PWM control.

※Zirconia O2 sensor cannot output the correct

signal if heater is not working properly.

※Titania O2 sensor cannot output the signal if

the power supply voltage is not supplied.

26

NORMAL TEST

●Do not touch the engine which has high temperature.
Be careful about the cables not to touch the heated
metal part.

●Stay away from the rotating part of the engine which
is very dangerous to be caught in. Also, be careful
about the cables not to be caught in.

●Start the engine under well ventilated environment
to prevent carbon monoxide poisoning.

WARNING

Connect two yellow check harness connecting plugs
to the red and black straight plugs respectively.

LCD displays "H" if the heater cable has the proper
voltage at 6V or more.

Checks of the heater cable voltage (when available)

V

Z

APO

Red test read straight plug

Yellow check harness

connecting plug

Black test lead straight plug

Yellow check harness

connecting plug

Only for the heater of zirconia O2 sensor,
disconnection check for the heater cable is possible by
simulation test. See "Disconnection check of the heater
cable" in page 36 to 38 for details.

SK-8402 取扱説明書（英文）_P27

27

NORMAL TEST

If LCD displays "Err", change the connection of two
yellow check harness connecting plugs and the red
and black straight plugs the in reverse.
Heater voltage is good if LCD displays "H".

●Connection of Titania O2 Sensor

Connect sensor signal cable to red, earthing
cable to black, and power supply cable to yellow
check harness connecting plugs respectively.

Attach alligator clip to black test lead straight plug
and fix it to the metal frame part of the car or
minus terminal of battery for earthing.
Connect red test lead straight plug to yellow check
harness connecting plug.

mV

Z

APO

"

−−−

"

V

Z

APO

"H"

mV

Z

APO

"Err"

Test leads are opened, grounded
or input voltage is within ±50mV.

Minus voltage is measured,
such as reverse connection or
when back electromotive force
is generated.

±6V or more is measured.

V

Z

APO

mV

Z

APO

Meanings of LCD display in stand-by mode

Alligator clip

Black test lead straight plug

Red test lead
straight plug

Yellow check harness
connecting plug

Checks of the power supply cable voltage
(when available)

SK-8402 取扱説明書（英文）_P28

NORMAL TEST

28

⑦Keep constant engine speed at approx. 2,500rpm

for 3 to 4 minutes to warm up the O2 sensor. O2

sensor is unable to output the correct signal unless
its temperature reaches the certain level. When
measuring the car without tachometer, estimate the
engine speed by its sound with stepping on the
accelerator pedal lightly.

When the proper power supply voltage is supplied,
LCD displays approx. 1V for titania 1V O2 sensor and
approx. 5V for titania 5V O2 sensor.

※Change the setting of O2 sensor type into the

correct one if necessary.

Alligator clip

Black test lead straight plug

Red test lead
straight plug

Red check harness
connecting plug

⑥Connect red and black check harness connecting

plugs to the red and black straight plugs
respectively.

※If the O2 sensor to be measured has only 1 or 3

cables, attach alligator clip to black test lead
straight plug and fix it to the metal frame part of
the car or minus terminal of battery for earthing.

Red test lead straight plug Red check harness connecting plug

Black test lead straight plug Black check harness connecting plug

Titania 1V

V

Z

APO

Titania 5V

V

Z

APO

SK-8402 取扱説明書（英文）_P29

29

NORMAL TEST

Continue the measurement even if the bar
graph blinks just after starting O2 sensor test.
Deterioration check can be made in the next
measurement step.

mV

RICH

TEST

Z

APO

(example)

※LCD displays "Err" continuously if the sensor signal

cable and sensor earthing cable are connected in
reverse. In this case, change the connection of test
leads to input terminals of SK-8402 in reverse, red
to (−) terminal and black to (＋) terminal.

 When changing the connection, stop the engine

completely and turn the ignition key switch to OFF
position.

 Continue the measurement when the connecting is

correct.

※If LCD keeps on displaying "

−−−

", confirm the check
harness connection between O2 sensor and ECU
connecting coupler. Continue the measurement if
they are connected correctly.

To prevent any accident, carefully check the gear position,
surrounding situation, and whether parking brake is
applied when stepping on the accelerator pedal.

WARNING

⑧Press TEST Key for 1 second or more and start

O2 sensor test.
and bar graph are displayed on LCD.

TEST

SK-8402 取扱説明書（英文）_P30

NORMAL TEST

30

⑨Keep the engine speed at approx. 2,500rpm. When

measuring the car without tachometer, estimate the
engine speed by its sound. Bar graph becomes stable
and shows the deterioration level of O2 sensor after

keeping the engine speed for 30 seconds or more.

※SK-8402 cannot display the deterioration

levels of A/F (air-fuel ratio) sensor and rear O2
sensor that is equipped behind the catalyst to
check the condition of 3-way catalyst.

※When measuring the above types of O2

sensors, bar graph blinks to alert the user. If
the bar graph keeps blinking during the
normal test, confirm the sensor equipped on
vehicle is not A/F (air-fuel ratio) sensor or not
measuring the rear O2 sensor.
When measuring the O2 sensor that is
equipped on the manifold side, bar graph
displays the actual test result.

mV

RICH

TEST

Z

APO

GOOD CHECK BAD

mV

RICH

TEST

Z

APO

GOOD CHECK BAD

mV

RICH

TEST

Z

APO

GOOD CHECK BAD

Examples of test results on bar graph

(No problem)

Replacement

recommended

Replacement

required

GOOD

CHECK

BAD

(

)

(

)

SK-8402 取扱説明書（英文）_P31

31

NORMAL TEST

mV

DH

RICH

TEST

Z

APO

Display hold

Available functions

●Press TEST Key for 1 second or less.
RICH → LEAN → AVG → Cycle → AUTO → RICH

Display mode changing

※In AUTO, display is changed automatically at

3 seconds intervals. (RICH → LEAN → AVG → RICH)

Check point

●RICH voltage drops down when O2 sensor
deteriorates.

●LEAN voltage changes upper and lower than
the standard LEAN voltage, and cycling speed
decreases.

●O2 sensor may be deteriorated if bar graph
blinks with extremely low RICH, LEAN and
AVG voltages and no cycle measurement.

●When measuring A/F sensor or rear O2 sensor,
RICH, LEAN and AVG voltages becomes
almost the same. Cycle cannot be measured.

●Press SEL Key for 1 second or less during the
normal test to hold the display. ( lights up)

 To release it : Press SEL Key again for 1 second

or more. ( is disappeared)

Display hold

DH

DH

※Display mode can be changed in display hold function.

⑩Press TEST Key for 2 seconds or more to finish

normal test.

⑪Stop the engine and turn off the ignition key switch.
⑫Press POWER Key for 1 second or more to turn off

the instrument.

⑬Remove check harness and test lead from the

connecting couplers of O2 sensor and ECU.

⑭Fix the connection of the connecting couplers of O2

sensor and ECU and finish the normal test.

Display mode
changing

SK-8402 取扱説明書（英文）_P32

NORMAL TEST

32

④Insert red test pin to the space of sensor signal

cable from the backside of connecting couplers of
O2 sensor or ECU (see "Confirmation of O2 Sensor
Cables" and "Colors of O2 Sensor Cables" in page

17). Test procedures are the same as when using

the check harness.

※Insert test pin deeply to have a enough continuity.
※If "

−−−

" remains displayed when checking the
heater cable voltage, insert test pin into another
heater cable. If LCD still displays "

−−−

", cable
disconnection, or blowout of a fuse that is
mounted on vehicle may occur.

Red test pin

Sensor signal cable

①Connect red test pin to red test lead straight plug.
②Connect alligator clip to black test lead straight plug.
③Fix alligator clip to the metal frame part of the car or

minus terminal of battery for earthing.
※LCD display might be drifting when connecting

the test leads or the cables due to the high input
impedance of this instrument, but does not affect
the measurement.

●Testing procedure when O2 sensor and ECU
cannot be connected by check harness

Alligator clip

Black test lead straight plug

Red test lead
straight plug

Red test pin

3. Measurement Procedure with Test Pin

SK-8402 取扱説明書（英文）_P33

33

NORMAL TEST

⑤If the O2 sensor to be measured has only 2 or 4

cables, attach black test pin to black straight plug
instead of alligator clip, and insert it to the space of
sensor earthing cable after confirming the sensor
signal by inserting red test pin to the space of
sensor signal cable (see "Confirmation of O2
Sensor Cables" and "Colors of O2 Sensor Cables"
in page 17). Start the test after confirming the
signals.

●Maintenance of connecting coupler

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.

Red test pin

Black test pin

Sensor signal cable

Sensor earthing cable

SK-8402 取扱説明書（英文）_P34

SIMULATION TEST

34

①Connect the connecting couplers of O2 sensor and

ECU properly with check harness.

②Make the O2 sensor test in reference to "Normal

Test" in page 24 to 33.

③ If the sensor type is not sure by a process to the

above, select the zirconia O2 sensor.
※To select the type of O2 sensor, press SEL Key

for 1 second or less in stand-by mode. (default
setting is zirconia O2 sensor)

※Simulation test cannot be made for A/F (air-fuel

ratio) sensor.

※Connect O2 sensor and ECU properly with check

harness before starting the simulation test.

※An error code might be memorized in ECU and

warning lamp may lights up when simulation test
is made for rear O2 sensor.

Do not make the simulation test for other
purposes except for the checking O2 sensor circuit
and this instrument.

CAUTION

What is simulation test?

Simulation test is the function that outputs the
simulated sensor signal from SK-8402 and check
various defects of O2 sensor and ECU. In combination
with a scanning tool that can monitor the control
condition of ECU or sensor signal waveform, various
checking are possible such as control condition of ECU,
connecting defects of cable connections of O2 sensor
and ECU, or O2 sensor troubles.

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SK-8402 取扱説明書（英文）_P35

SIMULATION TEST

35

⑥Press SEL Key for 1 second or less in simulation

test mode to select RICH signal output or LEAN
signal output.

Do not apply the simulation test for titania 5V
O2 sensor to zirconia O2 sensor or titania 1V
O2 sensor. It may damage the O2 sensor and
ECU.

CAUTION

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.

CAUTION

⑤Press SEL Key for 1 second or more in stand-by

mode to enter simulation test mode. lights up
on LCD.

※Confirm the selected O2 sensor type displayed

on LCD.

S

LEAN

RICH

Z S

APO

Z S

APO

④Connect red and black check harness connecting

plugs to the red and black straight plugs
respectively.

Red test lead straight plug

Red check harness

connecting plug

Black test lead straight plug

Black check harness

connecting plug

SK-8402 取扱説明書（英文）_P36

SIMULATION TEST

36

※To stop the "OL" blinking, turn off the instrument

or finish the simulation test.

※Checking control conditions of ECU and changes

of output waveform from O2 sensor are effective
for detecting cable connection error, O2 sensor
error or ECU error.

※When "OL" blinks on LCD during the simulation

test, O2 sensor error, cable connection error or
lower O2 sensor impedance than the threshold
may occur.

⑧Press SEL Key for 1 second or more to close

simulation test mode and to enter the stand-by
mode.

⑨When finishing the simulation test, follow the

procedures described from ⑩ to ⑭ in page 31.

⑦Press TEST Key for 1 second or less. The instrument

outputs RICH or LEAN simulation signals for 3
seconds with sign on LCD. 3 seconds interval
is necessary for next signal output.

TEST

RICH signal output

V

RICH

TEST

Z S

APO

LEAN signal output

mV

TEST

Z S

LEAN

APO

Trouble of O2 sensor (internal short circuit)
Short circuit of the cable connection
Internal impedance of the O2 sensor
becomes lower than the threshold of
simulation test. (There is no problem
when O2 sensor works normally)

Example 1 :
Example 2 :
Example 3 :

SK-8402 取扱説明書（英文）_P37

SIMULATION TEST

37

Disconnection check for the O2 sensor heater

Disconnection check for the O2 sensor heater is
possible by simulation test.

※Only for the heater of zirconia O2 sensor,

①Confirm that the engine is completely stopped.

(Turn off the engine and electric components)

②Detach connecting couplers of O2 sensor and ECU.
③Connect two female connecting terminals (yellow) to

heater cables of connecting coupler in O2 sensor side.

④Connect red and black L-shaped plugs of the test lead

to red (＋) and black (−) input terminals respectively.

Red test lead L-shaped plug

Black test lead L-shaped plug

⑤Connect two yellow check harness connecting plugs

to the red and black straight plugs respectively.

Red test lead straight plug

Yellow check harness
connecting plug

Black test lead straight plug

Yellow check harness
connecting plug

⑥Press POWER Key for 1 second or more to turn on

the instrument. It enters stand-by mode for cable
connection check.

⑦Press SEL Key for 1 second or more to enter

simulation test mode for zirconia O2 sensor.
lights up on LCD.
⑧Press TEST Key for 1 second or less to output RICH

signal.

S

※When the engine was running until just before

connection checking of the O2 sensor heater, test
it after waiting until it is cooled down. Because the
resistance of the heater is increased due to the
high temperature.

SK-8402 取扱説明書（英文）_P38

SIMULATION TEST

38

⑨The heater of O2 sensor has good continuity if

"OL" blinks on LCD. Otherwise, it should be

disconnected.

RICH

Z S

APO

⑨This concludes the disconnection check for O2

sensor heater.

SK-8402 取扱説明書（英文）_P39

MAINTENANCE

39

2. Periodical Check and Calibration

Replace the batteries in accordance with the follow­ing procedure when blinks on LCD.

④Fix battery cover and tighten up the screw.

Periodical check and calibration is necessary to
make safety measurements and to maintain the
specified accuracy. The recommended check and cal­ibration term is once a year and after the repair
service. This service is available at KAISE AUTHOR­IZED SERVICE AGENCY through your local dealer.

③Insert 2 pcs of new 1.5V R6P (AA manganese) or

LR6 (AA alkaline) in the correct polarity.

①Detach the instrument and the cables from the

measuring object and turn off the instrument.

②Loosen a screw of battery cover and open it. Then,

remove the exhausted batteries.
NOTE : Pull the screw when the battery cover is

hard to be opened.

Two 1.5V R6P or

LR6 Batteries

1.5V R6P

1.5V R6P

1.5V R6P

1.5V R6P

Battery

Cover

Pull the screw when the battery
cover is hard to be opened.

Screw

Screw

mV

RICH

TEST

Z

APO

1. Battery Replacement

SK-8402 取扱説明書（英文）_P40

40

TROUBLE SHOOTING

If there are any failure with this instrument, check the following trouble shoots before asking
repair service. Ask KAISE AUTHORIZED SERVICE AGENCY through your local dealer when there
are any questions or troubles with this instrument.

● Batteries are exhausted.
 → Replace the batteries.

● Batteries are installed in the wrong polarity.
 → Install the batteries in the correct polarity.

● Pressing time of the POWER Key is too short or not enough.
 → Press POWER Key for 1 second or more.

Symptoms Possible Causes and Necessary Treatments

Cannot turn on
the instrument

● The temperature of the O2 sensor is cooler than the certain temperature.
 → Warm up the O2 sensor keeping constant engine speed at approx.

2,500rpm for 3 or 4 minutes. Keep the engine speed at approx. 2,500rpm
during the normal test.

Displayed value

is unstable

● Test lead or check harness are broken.
 → Inspect whether they are disconnected. (see page 18 to 20)

● O2 sensor or the other parts are broken.
 → Make the same test with the other cars and check if the display still have

the failure.

LCD does not display

the measurement value

SK-8402 取扱説明書（英文）_P41

41

WARRANTY

SK-8402 is warranted in its entirety against any defects of material or workmanship under normal use
and service within a period of one year from the date of purchase of the original purchaser. Warranty
service is available at KAISE AUTHORIZED SERVICE AGENCY through your local dealer. Their
obligation under this warranty is limited to repairing or replacing SK-8402 returned intact or in
warrantable defect with proof of purchase and transport charges prepaid. KAISE AUTHORIZED
DEALER and the manufacturer, KAISE CORPORATION, shall not be liable for any consequential
damages, loss or otherwise. The foregoing warranty is exclusive and in lieu of all other warranties
including any warranty of merchantability, whether expressed or implied.
This warranty shall not apply to any instrument or other article of equipment which shall have been
repaired or altered outside of KAISE AUTHORIZED SERVICE AGENCY, nor which have been subject to
misuse, negligence, accident, incorrect repair by users, or any installation or use not in accordance
with instructions provided by the manufacturer.

WARRANTY

KAISE AUTHORIZED DEALER

422 Hayashinogo, Ueda City, Nagano Pref., 386-0156 Japan
TEL : [phone] (REP.) / FAX : [phone]
E-mail : [e-mail] http://www.kaise.com

SK-8402 取扱説明書（英文）表4

70-1201-8402-1 1001