APEXi V-AFC II User manual

1
VTEC AIR FLOW CONVERTERⅡ
WIRING DIAGRAM BY MODEL
This document describes car models to which the VTEC Airflow
Converter II (Product code: 401-A915/401-A815) is applicable,
and ECU terminal arrangement drawings. For the operating
method and precautions for the VTEC Airflow Converter II, refer
to the Instruction Manual.
For installing the VTEC Airflow Converter II, both this document
and the Instruction Manual are required.
Even if the car model and manufacturing year coincide with the
contents described in this document, this product may not be
installed in a special specification vehicle or remodeled vehicle.
The manufacturing years of applicable vehicles are as of March
2005. For application to vehicles released after that, consult
the respective APEXERA business office for information. 

2
■Introduction
“Safety precautions” are described in the Instruction Manual. Please read them before
starting the installation work.
“Signal words and their meanings” are described in the Instruction Manual for this product.
The “Engine Control Unit” is abbreviated as “ECU” in this document. 
CAUTION
！
●Regarding the installation of this product, be sure that it is
installed by an experienced professional.
After completion of the installation, hand over this document, Instruction Manual, and
Warranty to the customer (user).

●Do not pull the harness of the vehicle and the harness of this
product, 
Wire breaking or a short circuit may occur, thereby giving damage to this product and
the vehicle.

●When removing or connecting a connector, be sure to unlock
the locked (claw) status beforehand.
When the connector is provided with a fixing bolt, loosen this
bolt completely before pulling out the connector. 
The connector may be damaged.

●Arrange the harness of this product and the harness of the
vehicle in portions that are not at a high temperature or are not
movable. Arrange them so that water may not be splashed over
them.
Wire breaking or a short circuit may occur, thereby giving damage to this product and
the vehicle.

●Do not arrange the harness of this product and the harness of
the vehicle near a sharp-edged material. Do not put the harness
between materials by applying pressure to it.
Wire breaking or a short circuit may occur, thereby giving damage to this product and
the vehicle.
■Contents
■Introduction  Ｐ２
■Precaution on Installation  Ｐ３
■Installation  Ｐ５
■ECU Arrangement Drawing  Ｐ１０
■How to Refer to the ECU Terminal Arrangement Drawing  Ｐ１１

Table of Applicable Models..........................................................Ｐ１２
ECU Terminal Arrangement Drawing .........................................Ｐ１５

3
■Precaution on Installation
●When installing this product, do not use any electro-tap in any
case.
Using the electro-tap makes the contact status unstable. Its contact defect may causes
a malfunction to the product and damage to this product and the vehicle.
Be sure to use the attached splice and dedicated tools such as cutting pliers for electric
work to install the product securely. 

●Insulate the metallic portion of the harness securely with a
vinyl tape.
●Caulking the splice
(1) Peel off the coating of
thewiresabout8mm (2)Coverwithasleeve (3)Foldthewires (4)Caulksecurely
※Checkifcaulkinghasbeenperformedsecurelybyreferringtothefollowingfigure
Makethecaulkingthrustintothewire
(1)Peeloffthecoatingofthewirestobe
connectedabout5mm (2)Peeloffthewirestobe
branchedabout10mm (3)Entwinethewires (4)Caulksecurely
※Insulatethecaulkedportionsecurelywithavinyltape
●Caulking the plug

Caulkthecoatingbytheseportions

Caulktheconductorsbytheseportions

4
●The ground conductor of this product has two branches (black and brown).
This has a very important significance to secure the voltage conversion
accuracy. Connect the ground conductor by referring to the following figure.
Installing the ground conductor in a different way from the connecting method
specified by A’PEX will give damage to this product and the mounted car engine.
The above figure explains only the connection of the ground conductor. For the
other signal lines, refer to page 6 and page 7. Be sure to wire the power cable,
ground conductor and other signal lines to the positions specified by A’PEX.
Correct Connecting Method for the Ground Conductor 
Connect the ground conductor to two positions of the same line.
Be sure to connect the brown wire to the ECU side.
Allow a space of 1 cm or more between the connecting point of the black wire
and the connecting point of the brown wire.
Brown wire (ground)
Engine
Control Unit（ＥＣＵ）
Vehicle harness
Black wire(ground)
Wrong Connecting Method for the Ground Conductor
Unite the ground
wires into a single
line.
Do not connect the
ground conductor
to any position
(e.g. chassis ground)
other than the
specified position.
Engine
Control Unit（ＥＣＵ）
Engine
Control Unit（ＥＣＵ）
Vehicle harness
Brown wire (ground)
Black wire(ground)
Vehicle harness
Brown wire (ground)
Black wire(ground)

5
■Installation
●Connecting the VAFC II
１.Remove the negative (-) terminal of the battery.
advice!
CAUTION
！
２.Locate the Engine Control Unit (hereafter referred to as ECU) of the vehicle by referring
to the Wiring Diagram by Model.

３.Connect the harness attached to the V-AFC II securely to the power cable of the vehicle
harness, grounding conductor, engine revolution signal wire, throttle signal wire, and
TDC signal wire, VTC signal wire, and VTM signal wire that are connected to the ECU,
by referring to the Wiring Diagram by Model. (Refer to page 7.)
●Before starting the wiring work, remove the negative
terminal of the battery.
If not, a fire will be caused by short circuit, thereby giving damage to electric parts.
If the ECU connector is removed while the battery is connected, the engine
warning lamp may light up continuously regardless of whether the VAFC II is
installed or not. At this time, you must ask the distributor of each car model to
perform maintenance and inspection.

●We shall not take all responsibility for damage of the
vehicle or related devices that may be caused by
installation error.
Connect the red wire to the IG power.
Connect the green wire to the engine revolution signal wire.
Connect the gray wire to the throttle signal wire.
Connect the black wire to the grounding conductor.
Connect the brown wire to the grounding conductor.
Connect the orange wire to the VTCcam signal wire ※
Connect the light blue wire to the TDC signal wire.※
Connect the blue wire to the VTM signal wire.※

※The RDC signal wire and the TCC cam signal wire are limited to vehicles with an
i-VTEC.
※The VTM signal wire is limited to vehicles with a V type engine and some car models.
※For the details of the above TDC signal, VTC cam signal, and VTM
signal, refer to the terminal arrangement drawings on and after page
There is some setting data on car audio, car navigation, etc. that is backed up by battery power
supply. We recommend you to take a note of the data beforehand lest they should be lost.

6
■Installation (cont.)
４.Cut the pressure signal wire or VTEC solenoid signal wire of the vehicle harness
connected to the ECU and install a plug by referring to the Wiring Diagram by Model.
For some applicable models, cut the VTM signal wire and install a plug.
５.Connect the harness attached to the V-AFC II to the plug installed in 4.
６.Make sure to insulate the unused wires and plugs with a vinyl tape.
※Poor insulation may result in short-circuit, which leads to a danger.
７.Connect the negative (-) terminal of the battery.
●Be sure to connect the black wire and the brown wire of the
harness attached to the VAFC II to the ground conductor.
This product may not function normally, thereby giving damage to the product and the
engine.

●When locating each wire, take special care not to cause a
short circuit.
A fire may be caused or electric devices may be damaged.

●Install the splice for branching securely without any contact
defect.
A fire may be caused or electric devices may be damaged.
VTEC solenoid signal
Plug receptacle: Pressure sensor side
Plug: ECU side
Plug receptacle: ECU side
Plug: VTEC solenoid side
Pressure sensor signal
VTM signal Plug receptacle: ECU side
Plug receptacle: White wire
Plug: Yellow wire
Plug receptacle: Purple wire
Plug: Pink wire
Plug receptacle: Blue wire
CAUTION！
VTEC solenoid signal
Pressure sensor signal
VTM signal

7
■Installation (cont.)
●Wire connecting method
●Be sure to connect the brown wire to the ECU side from the
black wire.
This product may not function normally, thereby giving damage to the product and the
engine.

●Besuretoconnect the twowires of the IGpower supply.
Plug Plug receptacle Splice
Red wire (IG power)
Black wire (ground)
Brown wire(ground)
Green wire (rpm)
Gray wire (throttle signal)
Orange wire (VTC cam signal)
Light blue wire (TDC signal)
Blue wire (VTM signal)
Purple wire (VTEC solenoid signal input)
Yellow wire (pressure signal output)
White wire (pressure signal input)
Engine
Control Unit（ＥＣＵ）
Red wire (IG power)
Pink wire (VTEC solenoid signal output)
CAUTION
！

8
●Install the V-AFC II so that it may not interfere with driving.
Normal driving operations may be prevented, resulting in an accident.

●Do not install the V-AFC II in a high-temperature place or a
place exposed to direct water.
An electric shock or fire may be caused or electric parts may be damaged. A
malfunction may be caused, thereby giving damage to the vehicle.

●When passing the connecting harness of the V-AFC II, arrange
the harness so as not to touch the moving portion.
The connecting harness may be cut or short-circuited. The V-AFC II will be damaged,
thereby giving damage to the vehicle and electric parts.
●Checking after installation
After installing the V-AFC II, check the following items once again.
・Check if the harness attached to the V-AFC II is securely connected.
・Check if the harness is not unnaturally arranged.
・Check if the V-AFC II is securely fixed.
・Check if the negative (-) terminal of the battery is securely connected.

●Turn on the ignition switch. (Do not start the engine in any
case.)
Check the following contents after turning on the ignition switch.
・Check if characters are correctly displayed on the display part of the V-AFC II.
If the display of this product is not made correctly, stop using the product
immediately and make contact with the distributor or your nearest A’PEX
business office.

・Check if any abnormal noise or offensive small is produced from the V-AFC II
and the vehicle.
If any abnormal noise or offensive smell is sensed, stop using this product
immediately and make contact with the distributor or your nearest A’PEX
business office.

●Initial setup
・If no abnormality is found with the ignition switch ON, perform initial setup for the
V-AFC II.
・
When the engine is ready to start after initial setup, the installation work is
completed.
Perform sensor number setting, number-of-cylinders setting, VTEC type setting, throttle
sensor voltage checking, throttle sensor type setting, and throttle opening learning according
to “Initial Setup” on page 13 in the separate Instruction Manual. And set the reference cam
angle for vehicles with an i-VTEC.
WARNING
！

9
●Do not start the engine in any case before the initial setup is
performed.
If the engine is started without initial setup, the engine may be damaged. Set the
corresponding items by referring to page 13 in the Chapter pertaining to “Initial Setup”
in the separate Instruction Manual with regard to the initial setup method.
●When the engine warning lamp in the meter comes on, you
must ask the distributor of the model for inspection. If the
vehicle is driven at a high speed with the engine warning lamp
ON, the engine may be damaged, leading to an unexpected
accident. Do not drive the vehicle in this status in any case.
CAUTION
！
WARNING
！

10
■ECU Arrangement Drawing
●Perform operations by referring to the symbols in the
corresponding columns of the tables of applicable models
on and after page 12.
Ａ
Ｂ Ｃ Ｄ
Ｅ Ｆ
Ｇ
Ｈ Ｉ
Ｊ
Ｋ
Ｐ
Ｌ
Ｍ
Ｎ
Ｏ
A:Lower part of the passenger seat dash side
B:Right side of the glove box
C:Foot position of the passenger seat
D:Inner part of the glove box
E:Inner part of the center console
F:Under the driver’s seat
G:Under the passenger seat
H:Near the steering column
I:Left side of the meter panel
J:Lower part of the driver’s seat dash side
K:Left side of the center console
L:Engine room
M:Before the rear trunk
N:Behind after the driver’s seat
O:Behind the passenger seat
P:Upper inner part of the center console

11
■How to Refer to the ECU Terminal
Arrangement Drawing
This ECU terminal arrangement drawing is on the
assumption that the connector is viewed from the
direction of the arrow.

The direction of the ECU varies depending on each
vehicle. Perform the installation work after confirming
the connector shape and the number of pins carefully.
●If any abnormal noise or offensive smell is sensed during the
installation work of this product, stop the work immediately
and make contact with the distributor or your nearest A’PEX
business office.
Continuing the work in such a condition may cause an electric shock or fire or give
damage to electric devices.
WARNING
！

12
■Table of Applicable Models
Car name Car model Engine model Manufacturing
year ECU position Remarks Terminal drawing VTEC No. Sensor type
S2000AP1F20C‘99.4〜‘03.9 A H6-a1
PR-6
INTEGRA
(including the
’98
specification)
DC5K20A‘01.7〜‘03.8D
TypeR※1
（220ｐｓ） 1
iS ※13
160ｐｓ※2H7-ｂ3
DC2
DB8 B18C
‘95.9〜‘01.6 
A
M/TH4-a
1

A/TH2-c
‘93.5〜‘95.8 M/TH3-a
A/TH2-b
DA8
DA6B16A‘89.4〜‘93.5CH1-a
CIVIC
EP3K20A‘01.12〜※
D
TypeR※1
（220ｐｓ） H7-a 1 
Si ※2H7-ｂ 3
EU4
EU3D17A
‘00.10〜‘03.8

H8-a 3
EU2
EU1D15BExcluding
lean-burn
cars
EK9B16B
‘00.8〜‘00.9
A
H6-a
1
‘98.9〜‘00.7
H5-a
‘97.6〜‘98.8
H4-a
EK4B16A
‘98.9〜‘00.7
H5-a
‘95.9〜‘98.8
H4-a
EG6
‘91.9〜‘95.8

H3-a
EG4D15BExcluding carburetor
cars 2
EF9B16A‘89.9〜‘91.8CH1-a1
CIVIC
FERIO
ES4
ES3D17A
‘00.10〜‘03.8D

H8-a 3
ES2
ES1D15BExcluding
lean-burn
cars
EK4B16A
‘98.9〜‘00.7
A
H5-a1
‘95.9〜‘98.8
H4-a
EG9‘91.9〜‘95.8 H3-a 1
EG8D15B2
CIVIC
COUPE EJ1D16A‘92.10〜‘95.8AH3-a1
H7-a 
※Excluding VTEC 3 cars
※1 Japanese model only.
※2 USA model only.

13
Car name Car model Engine
model Manufacturing year ECU position Remarks Terminal drawing VTEC No. Sensor type
CR-X
EG2B16A‘92.3〜‘95.10 A H3-a1
PR-6
EG1D15B2
EF8B16A‘89.9〜‘92.2CH1-a1
PRELUDE
BB8
H22A
‘96.12〜‘00.9
C
H4-a
1
BB6
BB4
BB1‘91.9〜‘96.11
Without
TRC H3-a
With
TRC H2-a
ACCORD
EURO RCL1H22A‘00.6〜‘02.9EH6-a1
ACCORD
CL9Ｋ24A‘02.12〜※
E
H9-c1
CL3
F20B
‘00.6〜‘02.9M/TH6-a
3
A/TH5-a
CF5
‘97.9〜‘02.9

CF4M/TH6-a
A/TH5-a
CF3F18B
CD6H22A‘93.9〜‘97.8C H3-a
CD5F22B
ACCORD
WAGON
CM2K24A‘02.11〜※
E
Type
24T
1
CM3
CL2H23A‘00.6〜‘02.10 
H5-a
CH9‘99.1〜‘02.10 
CF7
CF6F23A‘97.10〜‘02.10 
3
CF2H22A‘96.9〜‘97.9  H3-a
CE1F22B‘94.3〜‘97.9C
FITGD4
GD3L15A‘02.9〜‘03.9BLoad
Sensing 
H8-a3
MOBILIO
SPIKEGK2 GK1L15A‘02.9〜※ BH8-a3
AVANCIER
TA4J30A‘00.2〜‘03.12
E
H5-b 2
TA3‘99.9〜‘03.12
TA2
TA1F23AH5-a3
H9-c

14
Car name Car model Engine model Manufacturing
year ECU position Remarks Terminal drawing Vehicle No. Sensor type
TORNEO
EURO RCL1H22A‘00.6〜‘02.9EH6-a1
PR-6
TORNEO
CL3
F20B
‘00.6〜‘02.9
E
M/TH6-a
3
A/TH5-a
CF5
‘97.9〜‘02.9

CF4 M/TH6-a
A/TH5-a
CF3F18B
LAGREAT RL1J35A‘99.6〜‘04.4EH5-b2
ODYSSEY
RB2
RB1K24A‘03.10〜※ B160psH9-d3PR-11※1
RA9
RA8J30A‘00.1〜‘03.9
EH5-b2
RA7
RA6F23A‘99.12〜‘03.9
H5-a3
RA5J30A‘97.10〜‘99.11
C
H4-b2
RA4
RA3F23A‘97.8〜‘99.11
H5-a3
STEP
WAGON RF4 RF3K20A‘01.4〜‘03.5EH9-a3
STREAM
RN4K20A‘01.1〜※
D
H9-a 3
RN3‘00.10〜※ 
RN2
RN1D17AH9-b
CR-VRD5
RD4K20A‘01.9〜‘04.8DH9-a3
INSPIRE
SAVER
UA5J32A‘98.10〜‘03.5E

H5-b 2
UA4J25A
PR-6
※1ProgramVersion2.05aafter.

15
VTM
signal
■ECU Terminal Arrangement Drawing
IG power 
rpm
Pressure signal
Ground Throttle signal
VTM signal
VTEC
solenoid signal
rpmIG power Pressure signal
VTEC
solenoid signal Ground VTM signal Throttle signal
Throttle signal
Pressure signal
VTM signal
Ground
IG power 
rpm
VTEC
solenoid signal
rpmIG power Pressure signal
VTEC
solenoid signal Ground Throttle signal
rpmIG power Pressure signal
VTEC
solenoid signal
Ground VTM signal Throttle signal
VTEC
solenoid signal IG power Throttle Pressure
signal
rpm
VTEC
solenoid signal Ground
IG power 
VTM
signal
rpm
Pressure
signal
Throttle signal rpmIG power VTEC
solenoid signal Pressure signal
Ground
Ground Throttle signal
rpmIG power Pressure
signal
Ground1Throttle signal
rpmIG power VTEC
solenoid signal Pressure signal
Ground Throttle signal
VTEC
solenoid signal
※Itisnotnecessary to wire for the
vehicle without the VTM signal
※Theremightnotbefreespaceof connector
Ground2
※Please select either ground 1 or ground2.

16
VTEC
solenoid signal
GroundIG power 
Throttle signal Pressure signal rpm
Pressure signal
VTC cam signal TDC
signal
Throttle signal VTEC
solenoid signal
Ground
IG power 
rpm
Pressure signal
VTC cam signal TDC
signal
Throttle signal VTEC
solenoid signal
Ground
IG power 
rpm
VTEC
solenoid signal
Ground
IG power 
Throttle signal Pressure signal rpm
Pressure signal
VTC cam signal
Throttle signal VTEC
solenoid signal
Ground
IG power 
rpm
TDC
signal VTM
※Itisnotnecessary to wire for the
vehicle without the VTM signal

17
IG power Ground
TDC
signal
VTC cam signal VTEC
solenoid signal
Throttle signal Pressure signal rpm
※Itisnotnecessary to wire for the
vehicle without the VTM signal
H9-c
H9-d
IG power Ground TDC signal VTC cam signal
VTEC
solenoid signal Throttle signal Pressure signal rpm

18
Ｎｏ, Date of issue Part No. of Wiring
Diagram by Model Edition Change of description
2Aug.１, 2003 7107-0300-01Second edition 
1May. 20, 2003 7107-0300-00First edition 
3Dec.26, 20037107-0300-02Third edition 
4Jun.10, 20047107-0300-03Fourth edition 
5Apr.1, 20057107-0300-04Fifth edition 
■Revision Record
Notes
１.The contents of this document are subject to change without previous notice.
２.The contents of this document have been prepared with extreme care. However,
if you find a doubt, error, or other fault, inform us of it.
３.A part or all of this document may not be reproduced in any form without prior
written permission, and also may not used without the prior written permission of
APEXERA CO., LTD. under the copyright except for private use.
・The company names and product names described in this document are the
registered trademarks or brands of the respective companies.
・contact are as of Apr.1, 2005. Note that this information is subject to change.

APEXERA Co.,Ltd.   http://www.apexera.co.jp
Head office :1-17-14 Tanashioda,Sagamihara-city Kanagawa,229-1125 JAPAN
ph+81-42-778-3991 fx+81-42-778-4495
USA officehttp://www.apexi-usa.com
A’pex Integration,Inc.:330W.Taft Orange,CA.92865,USA
ph : [phone] fx : [phone]