y ordering the applicable GM service manual (in three volumes). Troubleshooting techniques and
diagnosis are beyond the scope of these instructions. Diagnostic flow charts and troubleshooting advice are
included in the GM service manual.
The general design of the harness allows enough length for computer mounting in the dash & kick panel or
underhood area. Special harness lengths can be provided on a custom order basis.
All harness connections are clearly tagged. If for some reason a tag has been removed, consult the LS-1
Harness layout. Please identify all tags prior to beginning your installation.
The following information will briefly discuss the individual harness connections:
1. Blue Computer Plug(with black cap) J1 on computer
2. Black TCM Plug (with black cap) TCM Transmission Control Module (4L60E ONLY)
3. Gray Computer (with black cap) J3 on computer
3a. Black Computer Plug (with black cap) J2 on computer
4. Check Engine Light Wire (brown) (from Blue J1 plug)- For the use of a check engine light. Any 12V
automotive light will work. It can be mounted as a permanent fixture in the dash, or used as a diagnostic aid
only. The wire is hot when the key in in start or run. If light is not used, ensure the brown wire is properly
capped.
5. Electric Speedometer Wire (green) (from Blue J1 plug)- 4000 pulse to cruise or electric speedometer.
6. Tach Wire (if desired) (white) (from Blue J1 plug)- Feeds pulse to tachometer. If Tach fails to operate on this
pulse, contact Abbott Enterprises, 800-643-5973 for alternate pulse signal simulator.
6a. Ignition Start Switch (Yellow wire) (from Blue J1 plug)(4L60E ONLY)
7. Fuel Pump Relay Plug - Starts and stops fuel pump. During key-on runs 2 seconds to load injectors.
8. Brake Light Switch (Purple wire) (from TCM Plug) (4L60E ONLY)
9. Knock Sensor (Drivers side) next to driver side front O2 plug
10. Diagnostic Link Plug (ALDL) - Automatic Line Diagnostic Link is used in conjunction with the check engine light
and testing or troubleshooting.
11. Fuse Panel
12. Ignition Switch Hot Wire (red)- The single ignition wire must be connected to provide 12V with the key in START
(crank) and RUN position. 12V is then distributed through the fuse block to the computer (ECM), injectors and
coil. The fuse block has six (6) 10 amp and one (1) 20 amp fuses. Each injector bank is fused as is the com-
puter, battery and coil.
13. Battery Wire (orange) - Connects to main post on positive side of starter. If youre using a battery disconnect,
this lead must go to the hot side of the disconnect.
14. Engine Ground Wire (black wire w/sodered aluminum grommet) - The ground system is critical for proper
operation. A good battery to motor, and motor to harness ground is essential
Ground Battery to Motor or Trans (a must)!
Ground Motor to Frame and Motor to Body!
15. Hot Feed Electric Fuel Pump Wire (brown) - Provides 12V to the fuel pump. A fuel pump relay is also provided
with the harness and is energized/de-entergized by the ECM.
16. MAP Sensor Plug (grey plug w/white cap and purple waterproof rubber seal) - The Manifold Absolute
Pressure (MAP) measures the change in the intake manifold pressure from engine load and speed changes
and sends proportional adjustments to the computer. Connect the MAP sensor electronic connector from the
harness to the MAP sensor lead at the rear of the intake manifold. The MAP sensor lead will already be on
most new & used engines.
17. Accelerator Petal Postion.
18. Knock Sensor (Passenger side) Twisted pair shrink wrapped next to crank sensor plug and starer solenoid
19. Passenger Side Injectors (4 plugs w/green, blue, yellow, & purple uncommon wires) - Lay the harness up
over the intake with the passenger side and driver side injector and coil connecters on each side of the
engine. Connect the injector plugs into the fuel injection. The longest plug to the farthest point and so forth.
This will help hold the harness in place.
20. Passenger Coil (4 plugs w/tan waterproof rubber seal w/orange, yellow, gray, & white uncommon wires) -
Connect passenger side coils into injector coil packs.
21. Crank Sensor Plug - The crankshaft position sensor (CPS) is located in the lower front of the engine.
22. Back Up Lamp Feed (if desired)
TCM
(4L60E
)
Computer
J1
J2
J3 23. Passenger Front O2 Plug - Oxygen Sensor
24. CAM Sensor Plug (black connector w/white cap and purple waterproof rubber seal) - The camshaft position
sensor (CPS) must be installed prior to installing the intake maniford. The camshaft position sensor is located
on the timing cover behind the water pump near the camshaft sprocket. As the camshaft sprocket turns, a mag-
net activates the Hall effect switch in the camshaft position sensor. The plug for harness installation is at the
rear of the intake manifold. The CMP Sensor signal is created as piston #1 is approximately 25 degrees after
top dead center (TDC) on the power stroke.
25. Throttle Acturator Control Module
26. Vehicle Speed Sensor Plug (VSS) (black connector w/lite blue waterproof rubber seal) - The vehicle speed
sensor is a pulse counter type input that informs the PCM how fast the vehicle is being driven. The VSS system
uses an inductive sensor mounted in the tail housing of the transmission and a toothed reluctor wheel on the tail
shaft. As the reluctor rotates, the teeth alternately interfere with the magnetic field of the sensor creaing an
induced voltage pulse.
27. Transmission Plug (4L60E ONLY)
28. Transmission Range Switch Plug (Gray Plug) (4L60E ONLY)
29. Driver Coil (4 Plugs w/tan waterproof rubber seal w/purple, blue, green, red uncommon wires) - Connect
driver side coils into injector coil packs.
30. Starter Solenoid
31. Driver Side Front O2 Plug - Oxygen Sensor
32. Starter Relay (VETTE STARTERS ONLY)
33. Canister Purge Vent Valve (red connector w/blue cap & grey waterproof rubber seal) - Use with emission
vehicles, connects to the EVAP canister vent solenoid.
34. Canister Purge Use with emission vehicles
35. Mass Air Flow Plug (MAF) (black connector w/white cap and purple waterproof rubber seal) - Located on the
air duct, in the front of the intake manifold. If your using the Street & Performance Air Cleaner w/ZR-1 Air Temp,
just plug it into the passenger side back of air cleaner. Take care when handling the MAF. Do not touch the
sensing elements or allow anything to come in contact with them. The PCM converts the mass air flow sensor
input signal into grams per second, indicating the amount of air flow entering the engine.
36. Engine Temp Sensor Plug (black connector w/purple waterproof rubber seal) - Senses engine coolant temper-
atures during all operating conditions and signals electric fan operations. Located front head exhaust port. Must
use IROC/TA Coolant Sensor #12551708, 3 prong plug on Vette motors.
37. Oil Pressure Sensor
38. Driver Side Injectors (4 plugs w/black, red, white & brown uncommon wires)Lay the harness up over the intake
with the passenger side and driver side injector and coil connecters on each side of the engine. Connect the
injector plugs into the fuel injection. The longest plug to the farthest point and so forth. This will help hold the
harness in place.
T-56 Six Speed Transmission Only
39. Skip Shift Soleniod (white plug black seal blue cap)(red, gray wires)
40. Reverse Inhibit Soleniod (White plug, black seal, blue cap)(red and green wire)
41. Backup lamp feed switch (black plug, green seal)(green and black wire) 3a
3
2
1
4,5,6,6a
7
8
9
11
12
13
10
32
14
37
15
22
24
23
21
20
16
18
19
19
19
19
27
30
25
17
28
26
38
38
38
38
36
35
34
33
31
29
LS-2 DBW 4L60E T
ransmission LS-2 DBW
T
-56 Six S
peed
T
ransmission
1
3
3a
4,5,6
7
15
9
11
12
13
10
16
17
18
19
19
19
19
21
20
22
24
23
25
26
39
40
41
29
14
37
31
35
36
38
38
38
38 Stock oil pressure sensor
Crank sensor behind
starter
Large vaccum port for
power brakes and small
port for accessories
Passenger side knock
sensor
Driver side master coil
plug
Canister purge and
canister purge vent
valve
Quick disconnect 3/8
fuel inlet.
MAP sensor
Throttle Acturator Control Module
Driver side knock sensor
Five pin
Mass Air
Flow (MAF)
Coolant Temp
Sensor
Vehicle speed sensor
Reverse lock out
Skip ship soleniod
Hydraulic Clutch connetion
Bleed Valve
Pasenger side,
Backup lamp switch When getting the donor engine and trans-
mission, get the MASS AIR FLOW, COMPUT-
ER, TAC MODULE, GAS PEDAL, OXYGEN
SENSORS. S&P keeps a complete line of
new and used accessories.
SERV NO. ENGINE/VEHICLE
9254896- 99-00
4.8, 5.3 & 6.0
12200411- 01-02 4.8, 5.3, 6.0 &8.1
12200411- 01-03 IROC/TA Vette LS1/LS6
12586242- 04 Vette LS1/LS6
12576106- 03 4.8, 5.3 & 6.0
12586243- 04 4.8, 5.3 & 6.0
12589463- 05-06 4.8, 5.3 &6.0
12597191- 05 Vette LS2
12597883- 05 Vette LS2
12598343- 04 GTO / SSR
12597883- 05 GTO / SSR
12603892- 06
LS-2/LS-7
12583560- 06 5.3 Truck
12583561- 06 5.3 Truck
12596679- 06 5.3 SSR
A. 05 LS2 Computer 12597883
B. Transmission Controller
C. GTO DBW Throttle Pedal Assembly
C
A
B
LS-2 using 04 computer Manual Transmission
1G1YY12SX45101998
LS-2 using 04 computer Auto Transmission
2GCEK19N041175573
Drive by Wire
LS-2 using 05 computer (12597883) Manual
6G2VX12U15L386125
LS-2 using 05 computer 4L65E
6G2VX12U55L398245
2005 SSR. Truck
2005 Corvette
Passenger side master
coil plug
Stock GTO front bracket accessories
Injecter plug location bo