Sensors & Connectors🔗
Below outlines each sensor and connector location, along with common sensor/connector part numbers supported with the CORE harnesses, as well as the Drive-By-Cable (DBC) and Drive-By-Wire (DBW) connector wire colors.
Crankshaft Position Sensor🔗
The crankshaft position sensor on most Gen III & IV LS engines can be found on the lower right-hand side of the engine block above the starter.
| Generation | OEM | ACDelco |
|---|---|---|
| Gen III | 12560228 | 213-354 |
| Gen IV | 12585546 | N/A |
Crankshaft Position Sensor DBC & DBW Connector
Camshaft Position Sensor🔗
The camshaft position sensor on most Gen III LS engines can be found on the rear valley of the block behind the intake manifold.
The camshaft position sensor on most Gen IV LS engines can be found on the front of the engine on the front timing cover. Some may have an extension cable.
| Generation | OEM | ACDelco |
|---|---|---|
| Gen III | 12561211 | 213-363 |
| Gen IV | N/A | 213-3826 |
Camshaft Position Sensor DBC Connector
Camshaft Position Sensor DBW Connector
Throttle Position Sensor (TPS)🔗
The throttle position sensor on most Gen III & IV LS engines can be found towards the front of the engine on the throttle/butterfly shaft assembly, which is only applicable to the Gen III Drive-By-Cable harness.
| Generation | OEM | ACDelco |
|---|---|---|
| Gen III | 17123852 | 213-912 |
| Gen IV | N/A | N/A |
Throttle Position Sensor DBC Connector
Accelerator Pedal Position Sensor🔗
The accelerator pedal position sensor is located on the left side of the accelerator foot pedal, which is only applicable to the Gen IV Drive-By-Wire harness.
| Generation | OEM | ACDelco |
|---|---|---|
| Gen III | N/A | N/A |
| Gen IV | Varies by Application | Varies by Application |
Accelerator Pedal Position Sensor DBW Connector
Manifold Absolute Pressure (MAP) Sensor🔗
The MAP sensor on most Gen III & Gen IV LS engines can be found on top of the intake manifold.
| Generation | OEM | ACDelco |
|---|---|---|
| Gen III | 19418810 | 12614970 |
| Gen IV | 12591290 / 12644228 | 213-4434 |
Manifold Absolute Pressure Sensor DBC Connector
Manifold Absolute Pressure Sensor DBW Connector
Engine Coolant Temperature (ECT) Sensor🔗
The coolant temperature sensor on most Gen III & IV LS engines can be found on the driver side bank 1 cylinder head.
| Generation | OEM | ACDelco |
|---|---|---|
| Gen III | 15326388 | 213-953 |
| Gen IV | 15326388 | 213-953 |
Engine Coolant Temperature Sensor DBC & DBW Connector
Intake Air Temperature (IAT) Sensor🔗
The IAT sensor on most Gen III LS engines is located on the intake pipe separate and not incorporated into the MAF sensor.
The IAT sensor on most Gen IV LS engines is located on the intake pipe that is usually incorporated into the MAF.
Note
Both the Terminated Gen III Drive-By-Cable & Gen IV Drive-By-Wire harnesses will have a 5 wire MAF that integrates with the IAT. Customers will have to purchase an adapter harness from EFI and/or BP to split the 2 wire IAT sensor.
| Generation | OEM | ACDelco |
|---|---|---|
| Gen III | 12160244 (N/A with 5 wire MAF) | 213-243 (N/A with 5 wire MAF) |
| Gen IV | 12160244 | 213-243 |
Oil Pressure Sensor🔗
The oil pressure sensor on most Gen III & IV LS engines can be found towards the back on the engine, above the flywheel housing.
| Generation | OEM |
|---|---|
| Gen III | 12677836 |
| Gen IV | 12673134 |
Oil Pressure Sensor DBC Connector
Oil Pressure Sensor DBW Connector
Lambda Sensor (Oxygen Sensor)🔗
Both upstream lambda sensors can be found after the exhaust manifold flanges and before the catalytic converter on each bank.
| Generation | BOSCH |
|---|---|
| Gen III | 17025 |
| Gen IV | 17025 |
Lambda 1 Sensor DBC & DBW Connector
Lambda 2 Sensor DBC & DBW Connector
Knock Sensor🔗
Both knock sensors on most Gen III LS engines can be found under the valley and uses an extension harness with one connector.
Both knock sensors on most Gen IV LS engines can be found on the lower sides of the engine block in front of the starter motor or near the motor mounts and uses a separate connector for each knock sensor.
| Generation | OEM | ACDelco |
|---|---|---|
| Gen III | 12673134 | 213-3521 |
| Gen IV | N/A | 213-1576 |
Knock Sensor DBC Connector
Knock Sensor 1 & 2 DBW Connector
Mass Air Flow (MAF) Sensor🔗
The MAF sensor on most Gen III & IV LS engines can be located on the intake tube.
Note
Both the Terminated Gen III Drive-By-Cable & Gen IV Drive-By-Wire harnesses will have a 5 wire MAF that integrates with the IAT. Customers will have to purchase an adapter harness from EFI to split the 3 wire MAF sensor.
| Generation | OEM | ACDelco |
|---|---|---|
| Gen III | 25179711 (3 wire MAF, IAT Required) | 213-364 (3 wire MAF, IAT Required) |
| Gen III | 25168491 (5 wire MAF, applicable for LS1, LS2, & LS6) | 213-4657 (5 wire MAF, applicable for LS1, LS2, & LS6) |
| Gen IV | 15865791 | 213-4222 |
Mass Air Flow DBC & DBW Connector
Fuel Injectors🔗
The fuel injectors are located on top of the intake manifold on both the left and right banks.
Fuel Injectors 1-4 DBC & DBW Connector
Fuel Injectors 5-8 DBC & DBW Connector
Ignition Coils🔗
The ignition coils are located on both the left and right valve covers with a total of two connections, one for each bank.
| Generation | OEM | ACDelco |
|---|---|---|
| Gen III | Varies by Application | Varies by Application |
| Gen IV | Varies by Application | Varies by Application |
Ignition Coil Bank 1 DBC & DBW Connector
Ignition Coil Bank 2 DBC & DBW Connector
Note
First dozen DBC & DBW harnesses will NOT have the blue trace on the 12v ignition wire, this does not affect the functionality of either harness.
Barometric Pressure Sensor🔗
The barometric pressure sensor is often located on the fire wall on the right-hand side of the A/C blower motor when it's a standalone sensor. When it's not a standalone unit, the MAP and barometric pressure sensor are the same sensor.
| Generation | OEM |
|---|---|
| Gen III | 30-2130-15 |
| Gen IV | 30-2130-15 |
Barometric Pressure Sensor DBC & DBW Connector
Vehicle Speed Sensor🔗
The vehicle speed sensor is often on the driver near side of the transmission.
Vehicle Speed Sensor DBC & DBW Connector
Alternator Connector🔗
The alternator connector is located on the back side of the alternator.
| Generation | OEM | ACDelco |
|---|---|---|
| Gen III | Any 4 Cavity Connector | Any 4 Cavity Connector |
| Gen IV | Any 4 Cavity Connector | Any 4 Cavity Connector |
Alternator DBC & DBW Connector
Throttle Body Connector🔗
The throttle body connector is located on the throttle body itself. Any throttle body can be used with the Gen III harness, if the same style IAC and TPS sensor are used along with the throttle body.
| Generation | OEM |
|---|---|
| Gen III | TPS: 17123852 / IAC: 17113598 |
| Gen IV | 12570790 |
Throttle Body Connector DBW Connector
Idle Air Control Valve🔗
The idle air control valve is located directly above the right-hand side of the intake manifold or often on the throttle body.
| Generation | OEM | ACDelco |
|---|---|---|
| Gen III | 17113391 | 217-1806 |
| Gen IV | N/A | N/A |
Idle Air Control Valve DBC Connector
CAN Connectors🔗
The CAN connectors are located by the fuse box, close to the ECU side of the harness.
| Generation | DT Connector |
|---|---|
| Gen III | AT04-4P / TPA-AW4P / Terminal - AT60-202-16141 |
| Gen IV | AT04-4P / TPA-AW4P / Terminal - AT60-202-16141 |
CAN BUS 1 (Deutsch) DBC & DBW Connector
CAN BUS 2 (Deutsch) DBC & DBW Connector
I/O Connector🔗
I/O (Molex) DBC & DBW Connector
I/O (Molex) Pin 1-20 Connector
