Painless Performance 2005-06 GM LS2 Fuel Injection Wire 60520 Manuel D’Utilisation

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We at Painless Performance Products believe you have purchased the most up-to-date and easiest to install 
automotive fuel injection harness on the market.  All components to this harness are new.  All harnesses are tested 
for faults before they leave the factory floor.  This harness is designed for easy installation, even if you have no 
electrical experience.  Please read entire manual before installation. 
 
The 60520-21 harnesses are complete wiring systems for the fuel injection systems on General Motors throttle-by-
wire LS2 fuel injected engines and to control the 4L60E/4L65E automatic or T56 manual transmission.  Engines 
with codes ZJA, ZJB, 5MC, YTA and 6MC are supported by this harness (see page 18).  Factory 2002-03 LS6 
computers with service number 12200411 are to be used with this harness.  The computer must have 2002-03 ZO6 
Corvette programming.  The factory accelerator pedal and TAC module from the 2003 Corvette must also be used.  
If the pedal and TAC module are not taken from the donor vehicle they can be purchased new.  See page three for 
correct part numbers. Factory Corvette computers have an anti-theft feature programmed into them.  Before the 
engine will run this anti-theft feature must be programmed out.  These harnesses include all wiring that is needed by 
the computer to run and control the fuel injection system and transmission.  It is recommended that you have the 
computer reprogrammed to remove anything in the original factory programming that relates to a device or devices 
that are not being used in your particular vehicle.  Good examples of possible unused computer functions are rear O2 
sensors, anti-theft (removal required) and emissions (if not using the optional emissions harness and equipment). 
 
NOTE:  If you have purchased an LS2 with an engine code other than those listed above, you can still utilize this 

fuel injection wire harness after these engine modifications are made.  Contact your local engine machinist 
shop for help with these modifications. 
1.  The 58X crank shaft sensor reluctor wheel must be replaced with part number 12559353.  This 

replacement part number is a 24X crank shaft reluctor wheel from a 2005 Corvette LS2. 

 

2.  The crank shaft position sensor must be replaced with the part number 12560228. 

 

3.  The 4X camshaft sprocket must be replaced with part number 12576407.  This is a 2X sprocket from a 

2005 Corvette. 

 

4.  The cam shaft position sensor must be replaced with part number 12568983. 

 
NOTE: Most remanufactured computers come without any programming and must be programmed before they can 

be used.  

 
NOTE: The program in your computer must match the transmission that you plan on using.  For instance, you cannot 

run a 4L60E transmission with a computer programmed for a T56. 

 
Usually, the computer relays and fuse block can easily be mounted under the dash. Most of the wiring in the harness 
has been pre-terminated to the proper connector and all wire has been GM color-coded. All wiring is TXL, 600 volt, 
and 125 degree centigrade with cross-link insulation. 
 
These fuel injection system harnesses have been divided into the following three major groups: 
 
ENGINE GROUP 

Includes wiring for the fuel injectors, ignition and charging system, and engine sensors. 

 
DASH GROUP   

Includes ignition feed wire, assembly line diagnostic link (DLC) connector,  

 

 

check engine light, computer connectors, brake switch wiring, gear shift indicator wiring, 
tachometer wiring, fuse block, ECM connectors, TAC module connector, fuel pump relay 
connector, cruise control wiring, accelerator pedal position to TAC module wiring. 

 

TAIL GROUP 

 

Includes transmission wiring and a power wire for the fuel pump

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These instructions provide information for the installation of the 60520 & 60521 LS2 throttle-by-wire fuel injection 
harness kits.  The contents of these instructions are divided into the following major sections: 
 
1.0 INTRODUCTION 
2.0 

ABOUT THESE INSTRUCTIONS 

3.0 TOOLS 

NEEDED 

4.0 

PRE-INSTALLATION AND HARNESS ROUTING GUIDELINES