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Installation
In Brief
This page addresses the most commonly asked questions about the installation of one of
our harnesses. Due to the multitude of different scenarios, the information provided may
not be accurate in all situations.
For issues not addressed in this segment, please contact us
In Brief
This page addresses the most commonly asked questions about the installation of one of
our harnesses. Due to the multitude of different scenarios, the information provided may
not be accurate in all situations.
For issues not addressed in this segment, please contact us
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OBD Conversion Harness
General
The installation a conversion harness can require a certain level of expertise and should not
be undertaken without the proper knowledge. Please consult a professional installer.
The unit is to be connected to the car's wiring harness where the stock ECU use to plug in. If
the harness is equipped with a sub harness, some or all of those connections may be
required to ensure proper operation.
Additionally, some alterations to the factory wiring may be required, please see the model
specific notes below.
All connections should be soldered, not crimped.
The installation a conversion harness can require a certain level of expertise and should not
be undertaken without the proper knowledge. Please consult a professional installer.
The unit is to be connected to the car's wiring harness where the stock ECU use to plug in. If
the harness is equipped with a sub harness, some or all of those connections may be
required to ensure proper operation.
Additionally, some alterations to the factory wiring may be required, please see the model
specific notes below.
All connections should be soldered, not crimped.
OBD0 to OBD1, OBD0 to OBD2a and OBD0 to OBD2a
General
-Dual Point Injection vehicles will need to be converted to Multi Point.
-At least one 4 wire Oxygen Sensor must be installed, a second 4 wire Oxygen
sensor will need to be installed in some OBD2 applications. See detail below.
-Dual Point Injection vehicles will need to be converted to Multi Point.
-At least one 4 wire Oxygen Sensor must be installed, a second 4 wire Oxygen
sensor will need to be installed in some OBD2 applications. See detail below.
Distributor wiring
To complete this conversion, an OBD1 or OBD2 distributor must be installed. OBD1
and OBD2 distributors wiring color coding differs form OBD0 distributors.
To facilitate the installation of the new distributor in the OBD0 vehicle, 4 connections
have been interchanged within the harness. This change allows the installer to
match up wire colors when wiring the OBD0 distributor plug to the OBD1/OBD2
distributor.
Important: If you choose to replace the plug on the engine harness rather than the
plug on the distributor, wire colours will not match.
The connections rewired are CKP-P <------> CYP-P and CKP-M <------> CYP-M
To complete this conversion, an OBD1 or OBD2 distributor must be installed. OBD1
and OBD2 distributors wiring color coding differs form OBD0 distributors.
To facilitate the installation of the new distributor in the OBD0 vehicle, 4 connections
have been interchanged within the harness. This change allows the installer to
match up wire colors when wiring the OBD0 distributor plug to the OBD1/OBD2
distributor.
Important: If you choose to replace the plug on the engine harness rather than the
plug on the distributor, wire colours will not match.
The connections rewired are CKP-P <------> CYP-P and CKP-M <------> CYP-M
O2 Sensor wiring.
In order for an OBD1 or OBD2 ECU to function properly, a "4 wire" Oxygen sensor will
need to be installed. For you convenience all four connections for the sensor are
provided in the sub harness.
USDM OBD2 ECU: Please note, a secondary 4 wire Oxygen sensor will be required.
In order for an OBD1 or OBD2 ECU to function properly, a "4 wire" Oxygen sensor will
need to be installed. For you convenience all four connections for the sensor are
provided in the sub harness.
USDM OBD2 ECU: Please note, a secondary 4 wire Oxygen sensor will be required.
Service Check Connector
Service check connections have been included in the sub harness for convenience
only. The harness is designed to allow the use of the stock connector in it's stock
location or can be relocated anywhere in the passenger compartment using the
provided connections. A simple on/off type switch may also be used.
Important: Do not permanently connect service check wires. If a toggle switch is not
installed in the alternate location, ensure the wires are properly terminated so as to
avoid accidental contact.
Service check connections have been included in the sub harness for convenience
only. The harness is designed to allow the use of the stock connector in it's stock
location or can be relocated anywhere in the passenger compartment using the
provided connections. A simple on/off type switch may also be used.
Important: Do not permanently connect service check wires. If a toggle switch is not
installed in the alternate location, ensure the wires are properly terminated so as to
avoid accidental contact.
Intake Air Bypass(IAB)
IAB are only used in certain applications such as P72(GSR) and P13(Prelude). In
most cases the IAB signal is a ground and the second connection is the Power.
In some OBD2b applications, the signal is a power and the second wire is a ground.
For this reason, OBD0 to OBD2b adapters have a signal, power and ground
connection. Only two of the connections are required in all cases, ensure the
unused wire is properly terminated so as to avoid short circuits.
IAB are only used in certain applications such as P72(GSR) and P13(Prelude). In
most cases the IAB signal is a ground and the second connection is the Power.
In some OBD2b applications, the signal is a power and the second wire is a ground.
For this reason, OBD0 to OBD2b adapters have a signal, power and ground
connection. Only two of the connections are required in all cases, ensure the
unused wire is properly terminated so as to avoid short circuits.
VSS Signal
The Speedo on 88-91 Civics/CRXs has a speed pulser built into the instrument
cluster that supplies the correct signal for Vtec activation. The adapter is configured
to utilise this signal.
The Speedo on 88-91 Civics/CRXs has a speed pulser built into the instrument
cluster that supplies the correct signal for Vtec activation. The adapter is configured
to utilise this signal.
Vtec connections and Knock sensor
When installing this harness in a factory Vtec equipped vehicle, the connections for
Vtec and Knock sensor will need to be rerouted to the sub harness. For customers
requiring an adapter specific to a Vtec equipped vehicle, please contacts us.
Important: Ensure the Knock sensor wire and Vtec connections are properly
terminated when not used.
When installing this harness in a factory Vtec equipped vehicle, the connections for
Vtec and Knock sensor will need to be rerouted to the sub harness. For customers
requiring an adapter specific to a Vtec equipped vehicle, please contacts us.
Important: Ensure the Knock sensor wire and Vtec connections are properly
terminated when not used.
OBD1 to OBD2a, OBD1 to OBD2b
USDM spec vs. JDM spec ECUs
JDM Spec OBD2 ECUs do not require the sub harness connections. USDM Spec ECUs
require some additional sensors. Details below
JDM Spec OBD2 ECUs do not require the sub harness connections. USDM Spec ECUs
require some additional sensors. Details below
Secondary O2 Sensor wiring. USDM ECUs Only
In order for an USDM OBD2 ECU to function properly, a Second "4 wire" Oxygen
sensor will need to be installed. For you convenience all four connections for the
sensor are provided in the sub harness.
In order for an USDM OBD2 ECU to function properly, a Second "4 wire" Oxygen
sensor will need to be installed. For you convenience all four connections for the
sensor are provided in the sub harness.
V-AFC,V-AFCII, SAFC and SAFCII Extension Harnesses
These harnesses are designed to be Plug & Play harnesses requiring no
modification to the factory wiring.
modification to the factory wiring.
Important: First generation V-AFC and S-AFC Harnesses are NOT
compatible with second generation, V-AFCII and S-AFCII
compatible with second generation, V-AFCII and S-AFCII
Installation
-Locate the vehicles ECU
-Disconnect the wiring harness from the ECU.
-Connect the wiring harness to the Extension Harness
-Connect the Extension Harness to the ECU
-Connect the sub harness to the Apex-i unit.
-Locate the vehicles ECU
-Disconnect the wiring harness from the ECU.
-Connect the wiring harness to the Extension Harness
-Connect the Extension Harness to the ECU
-Connect the sub harness to the Apex-i unit.
Greddy E-Manage Extension Harnesses
This harness is NOT a Plug & Play harness and will require some
soldering. No modification to the vehicles factory wiring required
soldering. No modification to the vehicles factory wiring required
Installation
-Solder the sub harness provided with the E-Manage to the labeled wires on the
Extension Harness
-Locate the vehicles ECU
-Disconnect the wiring harness from the ECU.
-Connect the wiring harness to he Extension Harness
-Connect the Extension Harness to the ECU
-Solder the sub harness provided with the E-Manage to the labeled wires on the
Extension Harness
-Locate the vehicles ECU
-Disconnect the wiring harness from the ECU.
-Connect the wiring harness to he Extension Harness
-Connect the Extension Harness to the ECU
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Frog Engine Controls