GM Service Manual Online
For 1990-2009 cars only

Engine Controls Components 7.4L

Name

Location

Locator View

Connector End View

Group No.

Vehicle Control Module (VCM)

Engine Compartment, near BPMV Module

201-24 Fig. 37

--

3.670

Data Link Connector (DLC)

Under the LH side of the I/P

201-26 Fig. 41

202-16

--

I/P Fuse Block

Lower LH side of the I/P

201-23 Fig. 35

--

--

Underhood Fuse Relay Center

LH Rear of the Engine Compartment, on the Fender

201-4 FIg. 8

---

--

Fuel Pump Prime Connector

I/P Harness, approx. 20 cm into the Fuse- Relay Center

--

--

--

Fuel Injectors # 1 Through #8 VIN J

In the Intake Manifold at each cylinder

--

--

3.300

Idle Air Control (IAC) Valve Motor

Attatched to the RH rear of the Throttle Body

201-12 Fig. 18

--

3.820

Linear Exhaust Gas Recirculation (EGR) Valve VIN J

LH side center of the intake manifold

201-13 Fig. 19

--

3.670

AIR Injection Reaction Pump

Front of the Engine

--

--

--

AIR Injection Reaction Relay

Under Hood Fuse Relay Center

--

--

--

Ignition Coil

RH side rear of the Engine

201-14 Fig 20

--

--

Fuel Pump Relay

Located in the Underhood Fuse Relay Center

201-4

--

--

Manifold Absolute Pressure (MAP) Sensor VIN J

Top Front Center of the Intake manifold

201-12 Fig. 18

--

3.682

Heated Oxygen Sensors #1 through #4

In the Exhaust Pipe, in the front and the back of the Catalytic Converters

201-18 Fig. 26

--

3.682

Throttle Position (TP) Sensor

On the side of the Throttle Body

201-12 Fig. 18

--

3.682

Engine Coolant Temperature (ECT) Sensor

RH Top of the Engine near the Thermostat Housing

201-12 Fig. 18

--

3.682

Mass Air Flow (MAF) Sensor

Air Intake Duct near the air filter

201-13 Fig. 19

--

3.682

Vehicle Speed Sensor (VSS)

LH Rear side of the Transmission (LH side of the transfer case w/ 4WD)

201-18 Fig. 26

--

3.682

Camshaft Position Sensor

In the Distributor

201-7 Fig. 13

--

--

Input Speed Sensor, Transmission (4L80E automatic transmission)

LH side of the Transmission, near the front

201-19 Fig. 28

--

--

Knock Sensor VIN J

LH side Rear of the Engine on the Engine Block. RH side of the Engine Block, below the Exhaust Manifold, Forward of the Starter

201-14 Fig. 20

--

2.383

Evaporative Emission Purge Solenoid Vacuum Switch

Top of the Engine

201-7 Fig. 13

--

3.140

Intake Air Temperature (IAT) Sensor

In the Air Intake Duct

201-13 Fig. 19

--

3.682

Crankshaft Position (CKP) Sensor

Lower RH front portion of the Engine block, near the Crankshaft

201-7 Fig. 13

--

2.383

Distributor

Top of the Engine at the rear bulkhead

--

--

--

Fuel Pump Oil Pressure Switch and Sender

Rear Top Center of the Engine, behind the Distributor

201-14 Fig. 20

202-40

1.800

A/C Compressor Clutch Cycling Switch

In the low pressure refrigerant line

210-10 Fig. 16

--

--

A/C High Pressure cutout Switch

On the rear portion of A/C compressor

201-6 Fig. 12

--

--

Brake Pressure Modulator Valve (BPMV)

Near the Brake Master Cylinder, at the LH front wheelhouse

201-22 Fig. 33

--

--

Wheel Speed Sensor, LH front

At the LH front wheel

--

--

--

Wheel Speed Sensor, RH front

At the RH front wheel

--

--

--

Engine Controls Components 5.0L/5.7L/7.4L

Component Locations - 5.0L/5.7L

Name

Location

Locator View

Connector End View

Group No.

Vehicle Control Module (VCM)

Engine Compartment, LH Fender

201- 42,43 Fig. 43,44

--

3.670

Data Link Connector (DLC)

Under LH side of the I/P

201-69 Fig. 70

202-74

--

I/P Fuse Block

Lower LH side of the I/P

201-64 Fig. 65

202-90

--

Underhood Fuse Relay Center

LH Rear of Engine Compartment, on Fender

201-43 Fig. 44

202-92

--

Fuel Pump Prime Connector

I/P Harness, approx. 20 cm into the Fuse-Relay Center

--

--

--

Fuel Injectors # 1 Through #8 VIN M,R

In the Intake Manifold

201-17 Fig.18

202-88

3.300

Idle Air Control (IAC) Valve Motor

Top LH side of Engine.

201-19 Fig. 20

202-67

3.820

Linear Exhaust Gas Recirculation (EGR) Valve VIN M,R

Front of the Engine near the Thermostat Housing

201-17 Fig. 18

202-69

3.670

EVAP Canister Purge Solenoid

RH Center on the Intake Manifold

201-15,16 Fig. 16,17

202-50

3.140

Ignition Coil Driver

Top RH side rear of Engine

201-7 Fig 18

202-62

--

Fuel Pump Relay

Located in the Underhood Fuse Relay Center

201-43 Fig. 44

202-92,94,97

--

Manifold Absolute Pressure (MAP) Sensor VIN M,R

Top RH Center of Intake Manifold

201-17 Fig. 18

202-62

3.682

Heated Oxygen Sensors #1 through #4

In the Exhaust Pipe, in front and back of the Catalytic Converters

201-34 Fig. 35

202-66,67

3.682

Throttle Position (TP) Sensor

LH top of Engine.

201-19 Fig. 20

202-60

3.682

Engine Coolant Temperature (ECT) Sensor

Top front of the Engine.

201-19 Fig. 20

202-58

3.682

Mass Air Flow (MAF) Sensor

Air Intake Duct near the air filter

201-20 Fig. 21

202-59

3.682

Vehicle Speed Sensor (VSS)

LH Rear side of the Transmission.

201-31,32 Fig. 32,33

202-58

3.682

Camshaft Position Sensor

In the Distributor, rear top of Engine.

201-23 Fig. 24

202-60

--

Input Speed Sensor, Transmission (4L80E Automatic Transmission)

LH side of the Transmission, near the front

201-31,32 Fig. 32,33

202-58

--

Knock Sensor VIN (M,R)

RH side of the Engine on the Engine Block

201-22 Fig. 23

202-45

2.383

Evaporative Emission Purge Solenoid Vacuum Switch

RH side of the Engine

201-17 Fig. 18

202-48

3.140

Intake Air Temperature (IAT) Sensor

In the Air Intake Duct

201-20 Fig. 21

202-58

3.682

Crankshaft Position (CKP) Sensor

Lower RH front portion of the Engine block, near the Crankshaft

201-18 Fig. 19

202-60

2.383

Distributor

Rear top of the Engine.

201-20 Fig. 21

--

--

Ignition Coil

RH side rear of the Engine

201-14 Fig. 20

--

--

Fuel Pump Oil Pressure Switch and Sender

Rear Top Center of the Engine, behind the Distributor

201-15,23 Fig. 16,24

202-60

1.800

A/C Compressor Low Pressure Cut-off Switch

In the low pressure refrigerant line

210-46 Fig. 47

202-54

--

A/C High Pressure Cut-off Switch

On the rear portion of A/C Compressor

201-19,20 Fig. 20,30

202-55

--

Brake Pressure Differential Switch

Part of the (EBCM), LH frame rail near center of vehicle.

201-36 Fig. 37

202-51

--

Wheel Speed Sensor, LH front

At the LH Front Wheel

201-35 Fig.36

202-49

--

Wheel Speed Sensor, RH front

At the RH Front Wheel

201-35 Fig.36

202-49

--

Component Locations - 7.4L

Name

Location

Locator View

Connector End View

Group No.

Vehicle Control Module (VCM)

Engine Compartment, LH Fender.

201-42,43 Fig. 43,44

--

3.670

Data Link Connector (DLC)

Under the LH side of the I/P

201-69 Fig. 70

202-87

--

I/P Fuse Block

Lower LH side of the I/P

201-64 Fig. 65

202-90

--

Underhood Fuse Relay Center

LH Rear of the Engine Compartment, on the Fender

201-43 FIg. 44

-202-92

--

Fuel Pump Prime Connector

I/P Harness, approx. 20 cm into the Fuse- Relay Center

--

--

--

Fuel Injectors # 1 Through #8 VIN J

In the Intake Manifold at each cylinder

201-22 Fig.23

--

3.300

Idle Air Control (IAC) Valve Motor

Attatched to the RH rear of the Throttle Body

201-22 Fig. 23

--

3.820

Linear Exhaust Gas Recirculation (EGR) Valve VIN J

RH side center of the intake manifold

201-24 Fig. 25

202-69

3.670

AIR Injection Reaction Pump

Front of the Engine

--

--

--

AIR Injection Reaction Relay

Under Hood Fuse Relay Center

201-43 Fig. 44

202-92

--

Ignition Coil

Top RH side rear of the Engine

201-23 Fig 24

202-62

--

Fuel Pump Relay

Located in the Underhood Fuse Relay Center

201-43 Fig. 44

202-92

--

Manifold Absolute Pressure (MAP) Sensor VIN J

Top Front Center of the Intake Manifold

201-22 Fig. 23

202-62

3.682

Heated Oxygen Sensors #1 through #4

In the Exhaust Pipe, in the front and the back of the Catalytic Converters

201-34 Fig. 35

202-66,67

3.682

Throttle Position (TP) Sensor

On the RH side of the Throttle Body

201-22 Fig. 23

202-60

3.682

Engine Coolant Temperature (ECT) Sensor

RH Top of the Engine near the Thermostat Housing

201-22 Fig. 23

202-58

3.682

Mass Air Flow (MAF) Sensor

Air Intake Duct near the Air Filter

201-20 Fig. 21

202-59

3.682

Vehicle Speed Sensor (VSS)

LH rear side of the Transmission.

201-31,32 Fig. 32,33

202-58

3.682

Camshaft Position Sensor

In the Distributor

201-23 Fig. 24

202-60

--

Input Speed Sensor, Transmission (4L80E Automatic Transmission)

LH side of the Transmission, near the front

201-31,32 Fig. 32,33

202-58

--

Knock Sensor VIN J

LH side Rear of the Engine on the Engine Block. RH side of the Engine Block, below the Exhaust Manifold, Forward of the Starter

201-22,24 Fig. 23,25

202-45

2.383

Evaporative Emission Purge Solenoid Vacuum Switch

Top RH of the Engine

201-24 Fig. 25

202-48

3.140

Intake Air Temperature (IAT) Sensor

In the Air Intake Duct

201-25 Fig. 26

202-58

3.682

Crankshaft Position (CKP) Sensor

Lower RH front portion of the Engine block, near the Crankshaft

201-22 Fig. 23

202-60

2.383

Distributor

Top of the Engine at the rear.

201-20 Fig. 21

--

--

Fuel Pump Oil Pressure Switch and Sender

Rear Top Center of the Engine, behind the Distributor

201-15,23 Fig. 16,24

202-60

1.800

A/C Compressor Low Pressure Cut-off Switch

In the low pressure refrigerant line

210-46 Fig. 47

202-54

--

A/C High Pressure Cut-off Switch

On the rear portion of A/C compressor

201-19,29 Fig. 20,30

202-55

--

Brake Pressure Differential Switch

Part of the (EBCM), LH frame rail near center of Vehicle.

201-36 Fig. 37

202-51

--

Wheel Speed Sensor, LH front

At the LH front wheel

201-35 Fig. 36

202-49

--

Wheel Speed Sensor, RH front

At the RH front wheel

201-35 Fig. 36

202-49

--