Hybrid Racing K Series User manual

92-95 Civic EG / 94-01 DC Integra
K-Series Swap Conversion Wiring Harness V 4.0 Installation Manual
Harness Features:
 100% brand new connectors and pins.
 Integrates your K-series engine harness into
your chassis harness and ECU.
 Nylon braided sleeving for safety and cleanli-
ness.
 Data link connector
 Oxygen sensor relay
 Lifetime Hybrid Racing tech support at
support.hybrid-racing.com
Package Contents:
 Conversion wiring harness.
 Connectors.
 Zip Ties.
 Flyer with link to install guide.
 HR fresh Louisiana air.
Below you will find tips on how to install your new Hybrid Racing K-Series Conversion wiring harness.
*This harness may not be legal for highway use. Hybrid Racing is not responsible for any direct or indirect, actual or incidental expense attributed to
the use of any performance parts sold by Hybrid Racing LLC. Purchasers agree to all of the terms of this agreement upon the purchase of parts.
More information can be found at www.hybrid-racing.com.
Important!! Please read the entire install guide twice before starting
your installation. No, really it’s a good idea to read it twice before you
begin so everything goes smooth ;)
Recommend Tools:
 Wire Strippers
 Wire Snips
 Extra Zip Ties
 Solder & Soldering
Iron
 Heat shrinkable tub-
ing
 Electrical tape (This
is NOT an accepta-
ble material to cover
exposed wire core)
 Complete socket set
& ratchet
 Razor blade, knife
or scissors.
 Applicable chassis
wiring manual (for
trouble shooting)
 Voltmeter (for trou-
ble shooting)

While the Hybrid Racing Conversion Wiring Harness is 99% plug-n-play, there are a few wires that need
to be connected after the harness has been installed into the car. Because it involves electricity, there is
always the risk of damaging electronic devices, such as fuse boxes, ECU’s and sensors among other
things. Hybrid Racing strongly urges the installer of this product to become familiar with wiring and com-
mon wiring procedures before attempting to install this product.
If you are unsure of something, or have any questions regarding this product or its installation please
feel free to create a support ticket at support.hybrid-racing.com or email us at support@hybrid-
racing.com. Remember its easier and cheaper to email us than it is to damage something and have to
replace it.
This wiring harness is designed to integrate a K-series engine into the chassis specified on the first page
of the install guide, it serves no other function. It allows the engine, ECU and the chassis to communi-
cate together. Without it, the car will not function.
Each engine wiring harness requires the use of a charging harness. You must have a charge harness
installed or your car will not crank and run properly. This charge harness connects the alternator and
starter directly to the battery and fuse box. **All charging harnesses are NOT the same**. To avoid
using the wrong charge harness use the charge harness from the same chassis that your motor and
engine harness came from.
I. Engine Harness Selection
Below is a list of engine harnesses that are COMPATIABLE with the HR conversion
harness:
 K20A (JDM 01-05 DC5 Type R)
This engine wiring harness is made for RHD cars and is shorter than the LHD versions.
Depending on how it is routed, It may be necessary to extend the end of the harness so
that it reaches into the cabin. It also does NOT have an oil pressure switch connector.
 K20A2 ( USDM 02-04 DC5 Type S)
This is the most commonly used engine wiring harness. It is the best length and works with
both a 5spd and 6spd transmissions.
 K20A3 (USDM 02-05 EP3 & 02-04 DC5 Base *5spd only)
This engine wiring harnesses is for 5spd transmissions and will NOT have the connector
for the reverse lock out solenoid on the transmission. This is not necessary but if you want to
have this function you will need a 6peed engine harness and ECU.
These engine harnesses ARE NOT compatible with this conversion harness:
 K20Z1 (USDM 05-06 DC5 Type S)
This harness does NOT support the 05-06 RSX KPRO.
 K20Z3 (USDM 06+ FG Civic Si)
Has Drive-By-Wire and different ECU connectors.
 Any K24 harness
(any year, 5spd or auto)
If you have a harnesses that is not compatible, please obtain one of the compatible en-
gine harnesses before continuing with the installation. If you connect this conversion
harness to the wrong engine harness, you can damage the ECU, engine sensors and
any wiring *This is VERY important* if you are unsure email us at support@hybrid
-racing.com with a picture of your parts and we will help you figure it out.
Introduction & Installation Notes
A little bit of K-series information to make sure you have the right parts before you get started!

II. K-series ECU Options
Ranked in order of Hybrid Racings preference. For questions on all of the options you can create a sup-
port ticket at support.hybrid-racing.com or email us at [e-mail]
1. Hondata Kpro
If you are utilizing a Kpro you will need to follow the steps outlined in this install guide to set eve-
rything up properly.
ECUs that can be Kpro’d and used with the hybrid racing harness.
PRB with code number A01-A12 and 305 02-04 RSX manual
PND 02-04 Base RSX manual
PNF 02-04 Civic Si manual
PRC 02-04 JDM Integra Type R manual
PPA 02-04 CRV manual
PRD 02-04 CTR manual
ECUs that will not work wit the hybrid racing harness
PRA 02-04 Civic Type R ( technically possible to have Kpro’d but will not have a wide-
band)
PRB A13-A16 05-06 RSX
2. US SPEC Stock ECU’s with an HR immobilizer removal unit. You can see this
unit on the Hybrid Racing website.
All US spec K-series ECU have a built in immobilizer system. If you want to use a stock ECU
you will need to purchase the HR immobilizer removal box. If you have a stock ECU and no HR
immobilizer removal box your ECU will not turn on the fuel pump and it will not send a signal to
your coil packs. You can use the HR immobilizer box with the following ECU’s
PRB with code number A01-A12 and 305 02-04 RSX manual
PND 02-04 Base RSX manual
PNF 02-04 Civic Si manual
PPA 02-04 CRV manual
Please use the ECU that is most suitable for your engine. For example, if you have a
K20A2 from an 02-04 RSX it is best if you use a K20A2 PRB ECU!
No other ECU’s will work with the immobilizer box and the Hybrid Racing harness.
3. JDM TYPE R PRC ECU.
If you have access to a JDM Type R ecu with the code PRC you do not need to utilize the HR
immobilizer removal box. This ECU does not have the same type of immobilizer. You will still
need to ground one wire to kick your fuel pump on as outlined later in the install guide.
4. AEM EMS
If you are utilizing an AEM EMS you will need to defer to there installation manual.
5. Other
There very well may be more options if you have questions you can create a support ticket at
support.hybrid-racing.com or email us at [e-mail]

Getting to know your conversion harness.
1. This is your C302 connector
plug and it connects to your K-
series engine harness.
2. This is your E plug connector
and it plugs directly into your K-
series ECU.
3. This is the C101 connector and
it connects under your dash on the
drive side.
4. This is your Data Link Connector
“DLC” and is used to read error
codes from the ECU with a scan
tool.
5. This is the primary connector
plugs into the k-series wideband
oxygen sensor
6. This is the oxygen sensor relay.
Now that you are familiar with the
connectors head to the next page.

Quick Overview
1. Run stock K-series engine harness through
fire wall.
2. Install conversion harness and ECU under
dash.
3. Connect 4 wires from conversion harness.
4. Plug in all connectors and secure everything
on passenger side.
5. Run conversion harness to driver side.
6. Route/Connect 3 wires into engine bay on
driver side.
7. Route Oxygen sensors.
8. Setup Kpro.
9. Connect battery and confirm charge harness
is in place.
10. Finished.

Install Guide
STEP 1: Pop the hood of your
car and remove the battery, bat-
tery tray and unbolt the fuse box.
You do not have to disconnect
the wires going into the fuse box.
We just want to make sure we
can move it out of the way to
gain access to the hole in the
firewall that you will be running
your K-series engine harness
ECU plugs into. Once all of these
things are out of the way you
should be staring at a Grommet
on your firewall.
STEP 2: Go ahead and pry this
grommet from the firewall and
make a small slit along the side
of it. so that you can get some of
your unused connectors along
with the K-series engine harness
through the firewall and still
maintain a clean look.
STEP 3: Locate and disconnect
the wiring on the passenger side
shock tower. These wires are for
the OLD STOCK ENGINE HAR-
NESS and will not be used. Go
ahead and push them through
the firewall so that they are now
under your dash.
STEP 3
STEP 2
STEP 1

Install Guide
STEP 4: Next run your engine
harness connectors through the
firewall. Secure the grommet
back into the firewall and use a
little electrical tape to wrap the
grommet to the K-series engine
harness. Once this is done you
can reinstall your fuse box and
battery tray. We recommend you
leave the battery disconnected
until everything else is complete.
STEP 5: Grab your ECU and HR
conversion harness and move
inside the car. Pull back the car-
pet, kick panel and remove the
stock ECU. You should now have
your K-series engine harness,
the STOCK K-series ECU,
STOCK OEM ECU connectors
and the HR conversion harness
ready to go.
STEP 6: There are three wires
that run out of the white E plug
connector. Go ahead and cut the
zip ties and straighten the wires
out. If you have a 92-95 civic or
94 Integra move to page 8, If you
have a 96-99 Integra move to
page 9 and if you have 00-01 In-
tegra go to page 10.
STEP 6
STEP
STEP
STEP 5
5
5
STEP 4

STEP 8: (OBD1) 1992-1995 Civic / 1994 Integra
Only use this page if you have a 1992-1995 Civic or 1994 Acura Integra OBD1 chassis. Find and lo-
cate the three wires that come off of the Hybrid Racing conversion harness at the ECU E PLUG. These
wires should be GRN/YEL, GRN/RED & GRN/ORN.
CONNECT THE THREE WIRES AS OUTLINED BELOW:
 Connect E1 a GRN/YEL wire on the HR conversion harness to A7 a GRN/YEL wire on the STOCK
CIVIC/INTEGRA ECU CONNECTOR A. This wire controls the FUEL PUMP OR Type R ECU disre-
gard E1 a GRN/YEL wire on the HR conversion harness and GROUND A7 a GRN/YEL wire on the
STOCK CIVIC/INTEGRA ECU CONNECTOR A. This wire controls the FUEL PUMP.
 Connect E15 a GRN/RED wire on the HR conversion harness to D10 a GRN/RED wire on the
STOCK CIVIC/INTEGRA ECU CONNECTOR D. This wire controls the ELD.
 Connect E31 a GRN/ORN wire on the HR conversion harness to A13 a GRN/ORN wire on the
STOCK CIVIC/INTEGRA ECU CONNECTOR A. This wire controls the CHECK ENGINE LIGHT.
K-SERIES ECU CONNECTOR E
This is an example of how to connect the
wires. However soldering is highly
recommended as it creates a better
connection.
STOCK CIVIC/INTEGRA Connector D
STOCK CIVIC/INTEGRA Connector A

Step 8: (OBD2a) 1996-1999 Integra
Only use this page if you have a 1996-1999 ACURA INTEGRA OBD2a chassis. Find and locate the
three wires that come off of the Hybrid Racing conversion harness at the ECU E PLUG. These wires
should be GRN/YEL, GRN/RED & GRN/ORN.
CONNECT THE THREE WIRES AS OUTLINED BELOW:
 Connect E1 a GRN/YEL wire on the HR conversion harness to A16 a GRN/BLU wire on the
STOCK INTEGRA ECU CONNECTOR A. This wire controls the FUEL PUMP OR Type R ECU
disregard E1 a GRN/YEL wire on the HR conversion harness and GROUND A16 a GRN/BLU wire
on the STOCK INTEGRA ECU CONNECTOR A. This wire controls the FUEL PUMP.
 Connect E15 a GRN/RED wire on the HR conversion harness to D16 a GRN/RED wire on the
STOCK INTEGRA ECU CONNECTOR D. This wire controls the ELD.
 Connect E31 a GRN/ORN wire on the HR conversion harness to A18 a GRN/ORN wire on the
STOCK INTEGRA ECU CONNECTOR A. This wire controls the CHECK ENGINE LIGHT.
K-SERIES ECU CONNECTOR E
This is an example of how to connect the
wires. However soldering is highly
recommended as it creates a better
connection.
STOCK INTEGRA ECU CONNECTOR D
STOCK INTEGRA ECU CONNECTOR A

Step 8: (OBD2b) 2000-2001 Integra
Only use this page if you have a 1996-1999 ACURA INTEGRA OBD2a chassis. Find and locate the
three wires that come off of the Hybrid Racing conversion harness at the ECU E PLUG. These wires
should be GRN/YEL, GRN/RED & GRN/ORN.
CONNECT THE THREE WIRES AS OUTLINED BELOW:
 KPRO/Immobilizer Delete box connect E1 a GRN/YEL wire on the HR conversion harness to A15 a
GRN/YEL wire on the STOCK INTEGRA ECU CONNECTOR A. This wire controls the FUEL
PUMP OR Type R ECU disregard E1 a GRN/YEL wire on the HR conversion harness and
GROUND A15 a GRN/YEL wire on the STOCK INTEGRA ECU CONNECTOR A. This wire con-
trols the FUEL PUMP.
 Connect E15 a GRN/RED wire on the HR conversion harness to A30 a GRN/RED wire on the
STOCK INTEGRA ECU CONNECTOR D. This wire controls the ELD.
 Connect E31 a GRN/ORN wire on the HR conversion harness to A18 a GRN/ORN wire on the
STOCK INTEGRA ECU CONNECTOR A. This wire controls the CHECK ENGINE LIGHT.
K-SERIES ECU CONNECTOR E
This is an example of how to connect the
wires. However soldering is highly
recommended as it creates a better
connection.
STOCK INTEGRA ECU CONNECTOR A

Step 9: Connecting Wire Labeled Charging Light
 Connect the wire labeled charging light to B10 a WHT/BLU wire located on K-
series ECU CONNECTOR B using the supplied “T” taps DO NOT CUT. This wire
controls the battery light on the gauge cluster.
K-SERIES ECU CONNECTOR B

Install Guide
STEP 10: Plug the blue C302
connector from the HR harness
into the grey C101 connector
from the K-series engine har-
ness.
STEP 11: Plug the K-series en-
gine harness into the K-series
ECU. Plug the white E plug con-
nector from the Hybrid Racing
harness into the ECU.
STEP 12: Go ahead and secure
the DLC, Oxygen Sensor Relay
and mount the ECU. You are now
done on the passenger side.
STEP10
STEP10
STEP10
STEP11
STEP11
STEP11
STEP12
STEP12
STEP12

Install Guide
STEP 13: Now that everything on
the passenger side is complete
go ahead and move to the drive
side and remove the lower dash
panels so you can gain access to
where C101 on the Hybrid Rac-
ing harness plugs in.
STEP 14: Route the C101 blue
connector on the Hybrid Racing
harness to the driver side of your
chassis. You can use the sup-
plied zip ties to secure it nicely
under the dash. NOTE: 2000-
2001 INTEGRA. Remove pin 7
Blue wire and connect it to pin 14
Blue wire. Pin 14 has 3in of wire
that runs into the harness that
you can pull out. This controls
your TACH.
STEP 15: lay on your back and
look up into the corner for two
connectors one brown and one
grey. They are going to be inside
of a plastic holder. Disconnect
the plastic holder and unplug the
grey one. Secure it and move on-
to the next step.
STEP13
STEP13
STEP13
STEP14
STEP14
STEP14
STEP15
STEP15
STEP15

Install Guide
STEP 16: Connect the C101
connector to the HR harness and
cut the zip tie on the bundle of
wires. Go ahead and secure the
connectors with zip ties and
move to the next step.
STEP 17: Route the three loose
wires through the grommet locat-
ed on the driver side firewall.
Once the wires are in the engine
bay follow the instructions on the
remaining pages to connect
them. (NOTE: You can also pull
the large engine harness con-
nector inside the cabin to clean
things up. )
STEP 18: Locate the GRN/WHT
wire labeled FAN SWITCH. If you are
using a Hondata KPRO, the connec-
tion of the fan switch is NOT neces-
sary. It is only necessary if you want
to have the OEM sensor switch turn
the fans on and off. If you would like to
have KPRO turn the fan on and off
based off a temperature you can skip
the fan switch install steps.
STEP16
STEP16
STEP16
STEP17
STEP17
STEP17
STEP18

Install Guide
STEP 19: Connect the GRN/
WHT wire on the HR conversion
harness to ONE wire on the fan
switch sensor connector. The
other wire on the fan switch sen-
sor connector gets grounded to
the chassis. You can locate this
connector on your OEM STOCK
engine harness, you will need to
cut and remove it. Make sure to
leave at least 1in of wire to make
your connections.
STEP 20: Locate the YEL/GRN
wire labeled COOLANT TEMP
on the HR conversion harness
and connect it to the coolant
temp sensor connector. You can
locate this connector on your
OEM STOCK engine harness,
you will need to cut and remove
it. Make sure to leave at least 1in
of wire to make your connec-
STEP 21: Locate the GRN/RED
wire labeled BRAKE FLUIDE
and connect it to the GRN/RED
wire coming out of the brake fluid
reservoir.
STEP
STEP
STEP19
19
19
STEP20
STEP21
STEP21
STEP21

STEP 22: Primary A/F Ratio Sensor
Run the connector under the car. You can use one of the small holes already located in your chassis or
if you can not find one you can drill a small hole on the top of the tunnel under the radio location. Drop
the connector through the floor and plug it into your Oxygen sensor. The below information is useful in-
formation for making sure you have the correct sensor.
One of, if not the most important sensors on the K series motor is the A/F ratio sensor. This sensor is
located in the factory exhaust down pipe, closest to the motor. This is often called the “primary o2 sen-
sor” or “wideband o2 sensor.”
You MUST have this sensor connected properly for the engine to run correctly. Without it, you will have
a CEL and will suffer from sluggish performance and terrible fuel economy. There are exceptions to
this, like having the car tuned in open loop or running an aftermarket WB (innovative, AEM ect) sensor
installed into the harness.
*Note: Some chassis may have a hole in the floor pan of the car that the AFR sensor connector can go
through. If your chassis does not have this, you can drill a hole in the floor to run the harness to the sen-
sor in the exhaust.
The ONLY OEM style AFR sensors that are applicable are:
 2002-2004 RSX Type R: OEM Part Number 36531-PRB-A01- Replacement Denso Part Number
13680
 2001-2006 Integra Type R (JDM)
Sensors that ARE NOT compatible for Primary application are:
 2005-2006 RSX Type S
 2002-2006 RSX BASE
 2003-2005 Civic Si (EP3, & UK CTR)
 2006+ Civic Si
 Any K24 sensor
 Secondary Sensors
International user notes:
The European Civic Type R K20A engines use a narrowband o2 sensor and is NOT compatible with this
conversion harness. We accept no responsibility for users that wish to rewire the harness to work with a
narrowband ECU, engine wiring harness and sensor. If you would like to change the UK engine harness
to work with the US/JDM spec wideband AFR sensor & ECU, please refer to the trouble shooting sec-
tion at the beginning of this guide.

STEP 23: Secondary Oxygen Sensor
If you are running a KPRO ECU you can SKIP THIS STEP.
You will need to source this connector from your OEM engine harness make sure to leave 2-3in of wire
for you to make all of your connections.
Unlike the primary AFR sensor, the secondary o2 sensor is not necessary in most cases. If you are us-
ing the Hondata KPRO you can disable this sensor and you do not need to connect it. If you are using a
“SWAPECU-K,” this may not be necessary to connect either. Check to make sure the sensor has been
disabled before continuing.
Secondary o2 sensor compatibility:
 2002-2004 RSX Type S (& Base 5spd)
 2001-2006 Integra Type R & Type S
 2002-2005 Civic Si EP3
Sensors that ARE NOT compatible:
 2005-2006 RSX Type S
 2006+ Civic Si
For a guide on hot to disable the secondary o2 sensor in the KPRO software, please go to the
Hondata KPRO setup section of the guide.

STEP 24: Hondata KPRO Setup Guide
This section will help you properly set up your Hondata KPRO to crank your car. While
there are thousands of things the KPRO can do, we are going to briefly outline the few
necessary steps to get your car up and running.
*Before you begin*
The Hondata K-manager software is only compatible with Windows based operating
systems. Windows XP, Vista and Windows7 are all compatible with the K-manager
software. You will need to have the ECU installed in the car, the conversion harness
MUST be fully installed, and you must be connected to the ECU via USB in order to
continue.
Step 1. Installing and connecting to the ECU.
At this point, the conversion harness should be completely installed. The battery
should be installed and the car should turn on under its own power. Check all fuses
and connections before plugging in the ECU then continue.
 Open the K manager software on your Windows based PC.
 The bottom corner of the screen will say, “OFF LINE.”

STEP24: Hondata KPRO Setup Guide page 2
 Connect to the ECU via the supplied USB cord.
 Once the ECU and PC are connected, the bottom left hand corner of the screen should read “ON
LINE, IGNITION OFF.”
 If it does not rear online ignition on, please update your USB driver, change USB port, change PC or
use a different USB cord.
Step 2. Opening a calibration
 Turn the ignition to the ON position and check for connectivity at the bottom left hand corner of the K manag-
er software.

STEP24: Hondata KPRO Setup Guide page 3
 Once the ECU is connected to the PC, click on new calibration at the top left hand corner of the
screen.
 Once you have selected the proper map, click the OK button and the box will disappear.
 What engine setup you have will determine what map you upload at this point. For the purpose of
this guide, we will upload a stock calibration to a vehicle equipped with a K20A2 swap.