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

Table 17. Crankshaft Supported Sensor Table

Figure 7. Crankshaft Position Sensor DBC & DBW Connector View

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

Table 18. Camshaft Supported Sensor Table

Figure 8. Camshaft Position Sensor DBC Connector View

Figure 9. Camshaft Position Sensor DBW Connector View

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

Table 19. TPS Supported Sensor Table

Figure 10. Throttle Position Sensor DBC Connector View

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	ACDeleco
Gen III	N/A	N/A
Gen IV	Varies by Application	Varies by Application

Table 20. APP Supported Sensor Table

Figure 11. Accelerator Pedal Position Sensor DBW Connector View

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

Generation

OEM

ACDelco

Gen III

19418810

12614970

Gen IV

12591290

12644228

213-4434

Table 21. MAP Supported Sensor Table

Figure 12. Manifold Absolute Pressure Sensor DBC Connector View

Figure 13. Manifold Absolute Pressure Sensor DBW Connector View

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	ACDeleco
Gen III	15326388	213-953
Gen IV	15326388	213-953

Table 22. ECT Supported Sensor Table

Figure 14. Engine Coolant Temperature Sensor DBC & DBW Connector View

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

Table 23. IAT Supported Sensor Table

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

Table 24. Oil Pressure Supported Sensor Table

Figure 15. Oil Pressure Sensor DBC Connector View

Figure 16. Oil Pressure Sensor DBW Connector View

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

Table 25. Lambda Supported Sensor Table

Figure 17. Lambda 1 Sensor DBC & DBW Connector View

Figure 18. Lambda 2 Sensor DBC & DBW Connector View

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

Table 26. Knock Supported Sensor Table

Figure 19. Knock Sensor DBC Connector View

Figure 20. Knock Sensor 1 & 2 DBW Connector View

Mass Air Flow (MAF) Sensor

The MAF sensor on most Gen III & IV LS engines can be located on the intake tube.

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

Table 27. MAF Supported Sensor Table

Figure 21. Mass Air Flow DBC & DBW Connector View

Fuel Injectors

The fuel injectors are located on top of the intake manifold on both the left and right banks.

Figure 22. Fuel Injectors 1-4 DBC & DBW Connector View

Figure 23. Fuel Injectors 5-8 DBC & DBW Connector View

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

Table 28. Ignition Coil Supported Table

Figure 24. Ignition Coil Bank 1 DBC & DBW Connector View

Figure 25. Ignition Coil Bank 2 DBC & DBW Connector View

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

Table 29. Barometric Pressure Supported Sensor Table

Figure 26. Barometric Pressure Sensor DBC & DBW Connector View

Vehicle Speed Sensor

The vehicle speed sensor is often on the driver near side of the transmission.

Figure 27. Vehicle Speed Sensor DBC & DBW Connector View

Alternator Connector

The alternator connector is located ont he 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

Table 30. Alternator Supported Connector Table

Figure 28. Alternator DBC & DBW Connector View

Throttle Body Connector

The throttle body connector is located on the throttle body itself. The below table specifies the recommended part numbers for the gen III harness, 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.