GM Service Manual Online
For 1990-2009 cars only

4.3L Engine Controls Component Location Table

Name

Location

Locator View

Connector End View

Group No.

1-2 Shift Solenoid Valve

In the Automatic Transmission

8A-202

0470265

2-3 Shift Solenoid Valve

In the Automatic Transmission

8A-202

0470265

3-2 Shift Solenoid Valve

In the Automatic Transmission

8A-202

0470265

A/C Compressor

Top LH front of engine

8A-201

8A-202

9.170

A/C Compressor Clutch Diode

In engine harness 7.5 cm from the breakout to the A/C Compressor and high pressure switch

8A-201

2.510

A/C Compressor Cycling Switch

RH rear of engine near accumulator

8A-201

8A-202

9.172

A/C Compressor High Pressure Cut Off Switch

Rear of A/C Compressor

8A-201

8A-202

9.172

A/C Compressor Relay

Center rear of engine compartment

8A-201

8A-202

9.277

A/C Request Voltage Drop Resistor

I/P Harness, 7.5 cm right of relay center breakout

8A-201

Automatic Transmission

(In Line Connector C175) RH side of transmission

8A-201

8A-202

4.003

Automatic Transmission Fluid Pressure Manual Valve Position Switch

In the Automatic Transmission

8A-202

0470265

Brake Pressure Modulator Valve

LH side of engine compartment above wheel house

8A-201

0499730

Connector C1 (10 Cavities)

8A-202

Camshaft Position Sensor

Rear edge of distributor

8A-201

8A-202

2.383

Clutch Pedal Position And Cruise Control Shutoff Switch

On clutch pedal support bracket

8A-201

8A-202

0450054

Crankshaft Position Sensor

Below RH front of engine near harmonic balancer

8A-201

8A-202

2.383

Cruise Control Module

LH rear of engine compartment on cowl

8A-201

8A-202

3.887

Data Link Connector

Lower LH side of instrument panel

8A-201

8A-202

Distributor

Top rear of engine

8A-201

2.361

Driver's Information Display Center

Front of overhead console

8A-201

9.774

Connector C2 (9 Cavities)

8A-202

Electronic Brake Control Module

Part of Brake Pressure Modulator Valve

Electronic Ignition Control Module (Electronic Spark Control)

Top RH center of engine

8A-201

2.383

Engine Coolant Temperature Sensor

Top front center of engine on thermostat housing

8A-201

8A-202

2.682

Evaporative Emission Canister Purge Solenoid Valve

Top RH center of engine, just to the right of the injector connector

8A-201

8A-202

3.130

Evaporative Emission Canister Vent Solenoid Valve

Crossmember area of fuel tank

8A-201

8A-202

3.120

Exhaust Gas Recirculation Valve

Front center of engine

8A-201

8A-202

3.670

Four Wheel Drive Indicator Switch

Center of floor console

8A-201

8A-202

0495563

Front Axle Switch

Front axle, right of differential

8A-201

8A-202

Fuel Injector # 1

Top center of engine

8A-201

3.300

Fuel Injector # 2

Top center of engine

8A-201

3.300

Fuel Injector # 3

Top center of engine

8A-201

3.300

Fuel Injector # 4

Top center of engine

8A-201

3.300

Fuel Injector # 5

Top center of engine

8A-201

3.300

Fuel Injector # 6

Top center of engine

8A-201

3.300

Fuel Level Buffer Module

Under the I/P Compartment

8A-201

8A-202

3.108

Fuel Level Sensor With Fuel Pump (Fuel Sender With Pump)

Top of fuel tank

8A-201

8A-202

3.107

Fuel Pump Prime Connector

LH rear side of engine compartment

8A-201

8A-202

Fuel Pump Relay

In relay center

8A-201

8A-202

3.900

Fuel Pump Switch And Engine Oil Pressure Gauge Sensor

Center rear top of engine block, near distributor

8A-201

8A-202

1.800

Fuel Tank Pressure Sensor

Top of fuel tank

8A-201

8A-202

3.682

Heated Oxygen Sensor, LH Front

On the rear of the LH exhaust pipe on the left side of the transmission

8A-201

8A-202

3.682

Heated Oxygen Sensor, Post-Converter

Rear of catalytic converter

8A-201

8A-202

3.682

Heated Oxygen Sensor, Pre-Converter

Forward of catalytic converter

8A-201

8A-202

3.682

Heated Oxygen Sensor, RH Front

RH rear of engine in exhaust pipe

8A-201

8A-202

3.682

Heater And A/C Controller

Upper center of instrument panel

8A-201

9.273

Connector C1 (3 Cavities)

8A-202

I/P Fuse Block

LH side of instrument panel

8A-201

8A-11

Idle Air Control Valve

Upper LH portion of the throttle body assembly, just below the throttle position sensor

8A-201

8A-202

3.820

Ignition Coil

Top RH side of engine

8A-201

2.170

Instrument Cluster

LH side of instrument panel

8A-201

8A-202

9.735

Intake Air Temperature Sensor

LH front of engine compartment in air intake duct

8A-201

8A-202

3.682

Knock Sensor

Top rear LH center portion of cylinder block, near bell housing

8A-201

8A-202

2.383

Manifold Absolute Pressure Sensor

Top center RH portion of engine, near injector connector

8A-201

8A-202

3.682

Mass Air Flow Sensor

LH front of engine compartment on air intake duct

8A-201

8A-202

3.682

Pressure Control Solenoid Valve

In the Automatic Transmission

8A-202

0470265

Radio

Center of instrument panel

8A-201

9.650

Connector C2 (6 Cavities)

8A-202

Relay Center

Behind instrument panel compartment box

8A-201

8A-202

Spark Plug # 1

LH side of engine

8A-201

Spark Plug # 2

RH side of engine

8A-201

Spark Plug # 3

LH side of engine

8A-201

Spark Plug # 4

RH side of engine

8A-201

Spark Plug # 5

LH side of engine

8A-201

Spark Plug # 6

RH side of engine

8A-201

TCC Brake And Cruise Control Release Switch

On brake pedal support bracket

8A-201

8A-202

3.887

Throttle Position Sensor

LH upper forward portion of the throttle body assembly

8A-201

8A-202

3.339

Torque Converter Clutch Pulse Width Modulation Solenoid Valve

In the Automatic Transmission

8A-202

0470122

Torque Converter Clutch Solenoid Valve

In the Automatic Transmission

8A-202

0470265

Transfer Case Shift Control Module

Behind center of instrument panel

8A-201

8A-202

0495563

Transmission Fluid Temperature Sensor

In the Automatic Transmission

8A-202

Vehicle Control Module

RH side of engine compartment

8A-201

3.670

Connector C1 (32 Cavities)

Engine Controls Connector End Views

Connector C2 (32 Cavities)

Engine Controls Connector End Views

Connector C3 (32 Cavities)

Engine Controls Connector End Views

Connector C4 (24 Cavities)

Engine Controls Connector End Views

Connector C5 (5 Cavities)

8A-201

Vehicle Speed Sensor (With Manual Transmission, except with four wheel drive)

LH rear of transmission

8A-201

8A-202

3.682

Vehicle Speed Sensor (With Automatic Transmission, except with four wheel drive)

RH Rear of transmission

8A-201

8A-202

3.682

Vehicle Speed Sensor (With Four Wheel Drive)

LH rear of Transfer Case

8A-201

8A-202

3.682

C100 (8 cavities)

Engine harness to oxygen sensor harness, rear of VCM near blower motor

8A-201

8A-202

C101 (7 cavities)

Engine harness to I/P extension harness, RH side of engine compartment near VCM

8A-201

8A-202

C102 (15 cavities)

Engine harness to front of dash harness, LH rear of engine compartment above brake booster

8A-201

8A-202

C104 (6 cavities)

Engine harness to chassis harness, forward of lower portion of A/C evaporator coil housing

8A-201

8A-202

C105 (4 cavities)

Engine to oxygen sensor harness, LH frame rail, near vehicle speed sensor

8A-201

8A-202

C107 (7 cavities)

Front of dash harness to chassis harness, engine compartment near power distribution center

8A-201

8A-202

C111 (12 cavities)

Engine harness to fuel injector, on top of engine at the fuel injector

8A-201

8A-202

C114 (2 cavities)

Front of dash harness to front axle switch extension harness, LH engine compartment near cruise control module

8A-201

8A-202

C116 (2 cavities) (W/Automatic Transmission)

Engine harness to VSS extension harness, near C175, passes over the top of the transmission

8A-201

8A-202

C125 (4 cavities)

Oxygen sensor harness to oxygen sensor pigtail, RH frame rail approximately mid way between the catalytic converter and muffler

8A-201

8A-202

C126 (4 cavities)

Oxygen sensor extension harness to heated oxygen sensor pigtail, on RH frame rail, just forward of Y pipe

8A-201

8A-202

C127 (4 cavities)

Oxygen sensor extension harness to heated oxygen sensor pigtail, RH side of frame rail, to the rear of the Y pipe

8A-201

8A-202

C175 (13 cavities)

Engine harness to transmission, RH side of transmission just forward of Catalytic Converter

8A-201

8A-202

C200 (23 cavities)

Front of dash harness to I/P harness, behind RH side of instrument panel

8A-201

8A-202

C201 (23 cavities)

I/P harness to I/P extension harness, behind RH side of instrument panel

8A-201

8A-202

C202 (6 cavities)

I/P harness to I/P extension harness, behind RH side of instrument panel

8A-201

8A-202

C203 (56 cavities)

Front of dash harness to I/P harness, behind instrument panel, RH side

8A-201

8A-202

C209 (10 cavities)

Front of dash harness to dome lamp harness, behind upper LH side of instrument panel, Utility W/Overhead Console except Bravada

8A-201

8A-202

G101

LH rear of engine compartment to the left of the A/C compressor relay

8A-201

G102

RH rear of engine, on head

8A-201

G103

RH rear of engine, on head

8A-201

G104

LH rear portion of cylinder head

8A-201

G105

LH rear portion of cylinder head

8A-201

G402

LH rear of chassis on crossmember

8A-201

P100

At cowl on LH rear of engine compartment

8A-201

P101

At cowl on RH rear of engine compartment

8A-201

S100

Engine harness, 30 cm from VCM connector breakout

8A-201

S101

Engine harness 6.5 cm from generator breakout

8A-201

S102

Engine harness, 8 cm left of generator breakout

8A-201

S103

Engine harness, 7.5 cm from the A/C compressor and high pressure cut out switch breakout

8A-201

S104

In engine harness, 7.5 cm from the breakout to the A/C Compressor and High Pressure Cutout Switch

8A-201

S105

Engine harness, 2 cm from generator fusible link breakout toward fuel injector connector

8A-201

S106

Engine harness, 4 cm from generator breakout and toward the C104 connector

8A-201

S107

Engine harness, 4 cm from C104 breakout and toward the generator breakout

8A-201

S108

Engine harness, 13 cm from C102, C104 breakout and toward the connectors

8A-201

S109

Engine harness, 7 cm to the right of C102, C103, and C104 breakout

8A-201

S112

Engine harness, 38 cm left of C105 breakout, LH side of engine

8A-201

S129

In the automatic transmission

8A-201

S140

Engine harness, 15 cm from connector C116

8A-201

S209

I/P harness, 39 cm right of instrument cluster breakout

8A-201

S210

I/P harness, 43 cm right of instrument cluster breakout

8A-201

S212

I/P harness, 7 cm into the radio breakout

8A-201

S213

I/P harness, 4 cm left of cigarette lighter breakout

8A-201

S218

I/P harness, 5 cm left of relay center breakout

8A-201

S220

I/P harness, 6 cm into relay center breakout

8A-201

S221

I/P harness, 5 cm right of relay center breakout

8A-201

S224

I/P harness, 7 cm right of relay center breakout

8A-201

S225

I/P harness, 7 cm right of relay center breakout

8A-201

S227

Front of Dash, 8 cm into the data link connector breakout

8A-201

S230

Front of dash harness, 25 cm right of P100

8A-201

S231

Front of dash harness, 4 cm into clutch pedal position switch breakout

8A-201

S238

Front of dash harness, 11 cm into TCC Brake and Cruise Control Release Switch breakout

8A-201

S239

Front of dash harness, 18 cm from TCC Brake and Cruise Control Release Switch

8A-201

S241

In front-of-dash harness 6 cm to the right of the steering column breakout

8A-201

S243

Front of dash harness, 19 cm right of steering column breakout

8A-201

S244

Front of dash harness, 26 cm right of steering column breakout

8A-201

S246 (Utility)

Front of dash harness, 37 cm right of steering column breakout

8A-201

S250

Front of dash harness, 13 cm right of 4WD indicator breakout

8A-201

S259

Front of dash harness, 20 cm from C201

8A-201

S266

I/P harness, on breakout to instrument cluster, 6 cm from the breakout

8A-201

S298

I/P harness, 21 cm from C202 (inline to I/P extension harness) connector

8A-201

S317

Oxygen Sensor extension harness, 10 cm to the rear of the breakout for C126

8A-201

S318

Oxygen sensor jumper, 16 cm forward of C127 breakout

8A-201

S422

Chassis harness, between the breakouts to arming sensor and fuel pump, 7.5 cm from the fuel pump breakout

8A-201