P R A N C I N G M O O S E . C O M
D A V E ' S   V O L V O   P A G E
Microsquirt Conversion
Harnesses for 240


UPDATED: November 19, 2022         CONTACT
davebarton.com prancingmoose.com 240turbo.com
Payments and Policies
New Items
Cool Volvo Products 240 Modes & Fixes
Volvo
                  Stickers Volvo
                  SteeringWheel Labels
Volvo Wire Harnesses Volvo Harness Parts, Terminals, Connectors.
Volvo Prancing Moose Stickers Other Car Stickers Volvo Conversion Harness. Volvo 960 coil harness repairs.
Volvo Underhood, Body and Chassis Sticker and
                  Labels Other Car Stickers 740, 760, 780 Turbo Boost Faces Volvo Custom Black or White Faces.
240 Black Door Vinyl Stripes. Volvo 240 Window Scrapers 740, 940 odometer repair gears and instructions. Volvo 240 Odometer Repair Gears and Instructions.
Classic Auto AC Conversion Wheel Center Cap Overlays. Volvo Group A Racing Articles Prancing Moose, Volvo R-SPORT Horn Buttons, replica Alpina horn buttons Volvo Relays and Sensors. Volvo Adjustable Voltage Regulators
Volvo Meet Photos. Electric Fan Diagrams SoCal Area Salvage Yards 240 Hydraulic Clutch Modified 240s
Unleaded Race Fuel at the
                  PUMP B26FT Stroker
                  Build Volvo
                  Vacuum Diagrams Dave's 245
                  Specs Used Volvo Stuff 240 big brakes
R-Sport
                  apparel from Cafe Press
Prancing Moose Apparel from Cafe
                  Press 240 Suspension Mods Favorite Links

240 MS Main Engine Harness
Full DescriptionConversion Harness Guide

Sub-Harnesses

VE5710 LS Coil Harness
VE5729 COP Harness
VE5715 Bosch Ign Module Harness
VE5725 Hall Distributor Harness
VE5727 CAS Harness
Amphenol AT Connectors
  Questions?  CONTACT ME
ORDER MENU

VE5701 Main Engine Harness Microsquirt
Order Quantity:
Comment:  


Sub-Harness Options

VE5710 LS Coil Harness
Order Quantity:


VE5729 Coil-on-Plug Pencil Coil Harness (16V)
Order Quantity:


VE5715 Bosch Ignition Module Harness
Order Quantity:


VE5725 Hall Distributor Resistor Harness
Order Quantity:


VE5727 CAS Resistor Harness
Order Quantity:


Shipping Options
 

View Cart or Check Out
.


VE5701 240 Microsquirt V3 Main Engine Harness: $419.00
Made in the Netherlands 
Currently NOT STOCKED
This harness is currently MADE TO ORDER. Manufacturing lead time will be about 3 - 4 weeks.

Email with questions.  CONTACT ME
CLICK IMAGE FOR LARGER ONE




FULL DESCRIPTION

Microsquirt V3 engine harness for Volvo 240 4 Cylinder (Microsquirt ECU not included)
This main engine harness has been specifically designed for the use of Microsquirt V3 with a Volvo 4 cylinder in a 240.


COMPATIBLE WITH ALL 240 YEARS
This harness will work well on any year 240, however if you have a 1993 model, you'll need to make some changes to the circuits for the 8-pole firewall connector, since a 1993 240 doesn't have that firewall connector.
Installing this harness and using Microsquirt will require that you have a understanding of how Microsquirt works and how it needs to be programmed.

SHIELDED WIRES:

 Itís well known that low voltage EFI sensor or ignition signals can be affected by electrical interference (EMI). Megasquirt and Microsquirt are particularly vulnerable to EMI. Universal harnesses are available for Microsquirt, however they have been found to lack sufficient shielded wires. This harness was specifically designed with an abundance of high-performance shielding on vulnerable circuits.
 
AMPHENOL SEALED CONNECTORS:
Microsquirt V3 uses a 35-pin AMPSEAL connector and a sealed case to make a fully sealed unit. This harness uses a 35-pin AMPSEAL connector for this purpose.
This harnesses also uses a number of Amphenol AT multi-pin connectors. Amphenol AT connectors are very high-quality sealed connectors that are very easy to use and just happen to be 100% interchangeable with Deutsch DT connectors. More detailed information about these Amphenol AT connectors (and Deutsch DT connectors) may be found in my Connector Crimping Page.


Engine Speed, Ignition triggering OPTIONS (crank or cam position sensing). 
Direct plug-in options for this harness include:

A DSM CAS (Cam Angle Sensor) may be used. This is a custom CAS (made by Yoshifab), which is adapted to a Volvo distributor bottom half. It's then mounted in the normal engine block distributor location. This CAS can plug directly into this main engine harness (using a small adapter sub-harness). It will provide engine timing for Microsquirt. The CAS is generally used with a distributorless multi-coil ignition.

An LH 2.4 60-2 flywheel with Volvo crank position sensor may be used. This is the same as a standard Volvo CPS for an LH 2.4 car. It will provide engine timing for Microsquirt and is generally used with an LH 2.4 style ignition distributor and with a Bosch ignition amplifier. This may also be used with a distributorless multi-coil ignition.

A Volvo LH 2.2 Hall sensor style block-mounted 240 distributor. This is a standard ignition distributor from an LH 2.2 240. This distributor has a Hall sensor. It may be directly plugged into this harness (using a small adapter sub-harness). The Hall sensor in the distributor can provide engine timing for Microsquirt. A single factory coil may be used. With this option, there are multiple choices available for ignition amplification, but the simple choice is a Bosch ignition module (240 or 740 EZK type).

Other options, such an EDIS module and 36-1 front crank trigger wheel can be adapted if preferred, but these are not yet available as a direct plug-in with this harness.

SUB-HARNESS OPTIONS:
An optional available coil sub-harness may be added for a Coil-Near-Plug configuration using four GM LS style coils (PN D514a). This configuration works well with an 8 valve head. LS coils have their own logic level drivers, which receive trigger signals directly from Microsquirt and will work without the need for a separate ignition amplifier. LS coild would be wired for Wasted Spark Configuration using the two Ignition Outputs from the Microsquirt ECU.  IgnOut1 is connected to and controls coils 1 and 4. IgnOut2 is connected to coils 2 and 3. When an ignition is configured for Wasted Spark, two coils are fired at once. So in this case coils 1 and 4 will fire together when either cylinder 1 or 4 is ready for spark. Then coil 2 and 3 fire at together when either of those cylinders need spark.

An optional available coil sub-harness may be used to support a Coil-On-Plug configuration using four Denso pencil style coils (PN 129700-3881). These work well with a B234F 16 valve head. Since these pencil coils donít have internal drivers, this configuration requires an optional external ignition amplifier (i.e.: such as Yoshifab). If using a Yoshifab amplifier, it will be a direct plug-in to this optional sub-harness.

This main engine harness can support an optional available sub-harness for a MAF sensor, if desired. Microsquirt gives you the choice of using MAP only (which is the most common use), however if needed you may also configure MAF only or MAF/MAP blending. Several MAF sensor types are supported and that info is detailed in the below guide.

INJECTORS:
Microsquirt V3 has two injector driver outputs. Up to four high-impedance (saturated type) injectors may be used per driver (for up to eight injectors). This main engine harness is configured for FOUR injectors. The injectors are considered to be Batch Fire, which means all injectors fire at the same time (same as Bosch LH). For this four cylinder harness, each Microsquirt driver output is assigned two injectors.  Each driver limits injector current to ~5 amps and will drive high-impedance injectors without any changes.  If you opt for low-impedance (peak and hold type) injectors, they will require the addition of a resistor pack (resistors in series) to limit current.  Instructions for building and adding a resistor pack, which can be a direct plug-in, are included in the below guide.

MAP:
Microsquirt V3 has no internal MAP sensor (due to the compact case), so an external MAP sensor is required if you will be using a MAP sensor. A good choice is a General Motors type, which may be found with 1, 2, 3 bar, etc. capacity.  A 2-bar sensor will support boost up to 14.7 PSI (1 bar over normal atmospheric pressure). This harness uses a General Motors MAP sensor connector for direct plug-in support.

ALTERNATOR:
This main harness incorporates two separate leads for the alternator D+ (charge warning light) connection so that you may have your choice of mounting the alternator on the right (normal 240) side of the engine or on left side (740 style). And the fat red B+ cable is provided separately at a length for the alternator on the right side. The separate cable will make it easier if you decide to move the alternator to the other side.

IAC:
This harness provides direct support for a Bosch 2-wire PWM style idle valve (typical LH 2.4 style IAC valve).
If a 4-wire stepper motor idle valve is desired instead, an optional Microsquirt Stepper Adapter Module is available from other sources and can be adapted. Those circuits are detailed in the below guide.


POWER:
Power to the Microsquirt ECU, relays and fuel injectors will go through a relay/fuse block (included with the main harness).  Fuses are included, but relays are not included. You will need three relays, which will control Main Power, Fuel Pumps, and Ignition. You should choose 12 volt Automotive 4 or 5 pin Micro Relays. These relays will have two 1/4 inch (6.3 mm) pins and two or three 3/16 inch (4.8 mm) pins. 15A or higher capacity is recommended.

It is strongly recommended that the 12v main battery power source to the relay/fuse block for this harness should have a clean, direct path to battery positive.  Do not use power from just any 12v source you find in your dash. Using a dedicated power cable from the battery to the relay block is the best choice and will provide the cleanest power for the ECU.



Microsquirt V3 will not support a knock sensor directly and knock sensing is not directly supported by this harness. While itís not here, itís possible to adapter or add an external interface module for a knock sensor if that's needed.

MicroSquirt V3 comes with preloaded embedded code (unlike Megasquirt -II). You may upgrade to newer code as new versions are released, but you will not have to load the code initially to get MicroSquirt running.

The bootloader function in Microsquirt is externally accessible.  Serial RS-232 signals are directed through the 35-pin AMPSEAL connector to an external 3.5 mm data jack provided near the ECU for convenient connection to your computer.

Microsquirt controllers and harnesses are not offered or approved for use on emission controlled vehicles.
Check the laws that apply in your location to determine if using Microsquirt is legal for your application.

RELAY AND FUSE BLOCK





FULL HARNESS GUIDE (30 pages, 3.8 mb PDF)
  https://www.davebarton.com/pdf/Harness_Microsquirt240-2022.pdf




SUB-HARNESSES
VE5710 LS Coil Harness: $90.00
Made in the Netherlands 
Currently Not in STOCK
This harness is currently MADE TO ORDER. Manufacturing lead time will be about 3 - 4 weeks.

Email with questions.  CONTACT ME
CLICK IMAGE FOR LARGER ONE



This optional sub-harness is designed to use four GM LS style coils. LS coils have built-in igniters and may receive logic level signals directly from the two Microsquirt ignition outputs. No external ignition amplifier is needed when using this coil configuration.

Many ignition modules (AKA "igniters") and some coils with built-in igniters (such as the LS coils) require a logic level signal for operation. Generally this means a 0 or 5 volt alternating signal is received at the coil signal pin. This 0 or 5 volt signal alternates at appropriate times to activate DWELL and SPARK.

Most logic level coils, including an LS coil, work in a positive logic mode. When 5v is received to the coil signal pin, the coil begins to charge (DWELL). Then when the signal alternates to 0 volts, the coil fires (SPARK).

The FIRING ORDER for a 4 cylinder engine is 1-3-4-2.  With this option you may use four logic level Delco (GM) D514a coils wired to TWO Microsquirt ignition outputs.
These are configured to fire in sequence, which means:  COIL 1, then COIL 3, then COIL 4, then COIL 2.

To accomplish this using only TWO ignition outputs, the outputs will alternate:
First IGN OUTPUT1 fires COIL 1 and 4.
Then IGN OUTPUT2 fires COIL 2 and 3.
Then IGN OUTPUT1 fires COIL 1 and 4.
Then IGN OUTPUT2 fires COIL 2 and 3.
This accomplishes a proper 1-3-4-2 firing order using a wasted spark configuration.



VE5729 Coil-On-Plug (COP) Pencil Coil Harness: $80.00
Made in the Netherlands 
Currently Not in STOCK
This harness is currently MADE TO ORDER. Manufacturing lead time will be about 3 - 4 weeks.

Email with questions.  CONTACT ME
CLICK IMAGE FOR LARGER ONE


The optional COP Harness comes fully assembled and includes a 6-pole plug, which connects to the main engine harness, a 14-pole plug for the ignition module, four coil plugs and a ground ring. This harness is designed for use with Denso pencil style coils (PN 129700-3881).
This sub-harness is intended for use with the YOSHIFAB FOUR-CHANNEL IGNITION MODULE, which may be mounted on the firewall.




VE5715 Bosch Ignition Module Harness: $35.00
Made in the Netherlands 
Currently Not in STOCK
This harness is currently MADE TO ORDER. Manufacturing lead time will be about 3 - 4 weeks.

Email with questions.  CONTACT ME
CLICK IMAGE FOR LARGER ONE


This optional sub-harness may be used when a Volvo LH 2.2 style distributor (with internal Hall sensor) is to be used. This distributor will supply the engine timing/speed signal to Microsquirt.  Also this sub-harness may optionally be used when an LH 2.4 style crank position sensor (CPS) is used for the engine speed signal.

This sub-harness connects the main harness (Conn. 11, 6-pole plug) to the above Bosch single stage ignition module (PN 0 227 100 124), which can be sourced from any LH 2.4 Volvo 240 or LH 2.2 or 2.4 740.




VE5725 Hall Distributor Resistor Harness: $30.00
Made in the Netherlands 
Currently Not in STOCK
This harness is currently MADE TO ORDER. Manufacturing lead time will be about 3 - 4 weeks.

Email with questions.  CONTACT ME
CLICK IMAGE FOR LARGER ONE


This optional sub-harness is intended for use with a Volvo LH 2.2 block-mounted ignition distributor (with internal Hall sensor). This is a standard ignition distributor from an LH 2.2 240, which can be directly plugged into the main harness (using this small adapter sub-harness). The Hall sensor in the distributor provides needed engine timing/speed for Microsquirt. A single factory style coil may be used. With this option, there are multiple choices available for ignition amplification, but the preferred choice is a Bosch ignition module shown above.



VE5727 CAS Resistor Harness: $30.00
Made in the Netherlands 
Currently Not in STOCK
This harness is currently MADE TO ORDER. Manufacturing lead time will be about 3 - 4 weeks.

Email with questions.  CONTACT ME
CLICK IMAGE FOR LARGER ONE


This optional sub-harness is intended for use with the Yoshifab Cam Angle Sensor (CAS), which is mounted in the engine block where the ignition distributor would normally go. The CAS is used to provide engine speed/timing data for the Microsquirt ECU.





davebarton.com
prancingmoose.com
240turbo.com
Contact Us
Prancing Moose Stickers
Volvo Stickers
Body/Chassis/Engine Labels
New Items
Other Car Brand Stickers
Steering Wheel Labels
Center Cap Labels/Overlays
Cool Volvo Products
Grill Labels/Overlays
Volvo Wire Harnesses
Conversion Harnesses
Harness Parts/Connectors
Volvo Relays
Coil Repair Harnesses
240 Window Scrapers
740/940 Window Scrapers
Adjustable Voltage Regulators
Horn Buttons
240 Odometer Repair
740 Odometer Repair
Volvo Gauge Faces
740 Turbo/Boost Faces
240 Black Door Vinyl
850 Odometer Repair
ALTERNATOR PAGE
240 Power Mirrors - Switches
240 Oil Cooler Page
240 Fuse Panel Page
Group A Racing Volvo 242 Turbo
240 Hydraulic Clutch Fuel Pump Relay Page
240 Headlight Relay Page
Used Parts & Stuff
CRIMPING Page
240 Ignition Page
240 Headlight Page
240 Gauge and Electrical Diagrams 240 Rear End Page Yoshifab Catch Can Install 240 Mods and Fixes
Side Marker Lights Gentex Mirror Upgrade Yoshifab Drain Tube Install Modified 240 Favorites
SoCal Salvage Yards Unleaded Racing Fuel B26FT Stroker Dave's 245 Spec Page
240 Suspensions 240 Lowering Page
240 Windshield Page
240 WIPER Page
240 Big Brakes 240 Dash Top Gauge Pod Cadillac 4-Note Horn Install 240 Dynamat Install
4 Speed Fan Controller
Electric Cooling Fan Page
Tropical Fan Clutches
240 AC Page
240 VIN Page Stepper Idle Valve Page
Vacuum Diagrams Volvo Meet Photo Albums
240 Exhaust Page
EFI - Ignition PIN Function Diagrams
Favorite Links
R-Sport Apparel
Prancing Moose Apparel
Mojave Road Trail Map Page
Texas Volvo Meets and Events
Ordering Instructions Policies Payments Shopping Cart Troubleshooting
Returns Shipping


Online Payments