GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Accelerator Pedal Position (APP) Sensor

To the left of center, on the lower bulkhead

Engine Controls Component Views

Engine Controls Connector End Views

Automatic Transmission (A/T) Modulator

On the lower left side of the transmission

--

Engine Controls Connector End Views

Camshaft Position (CMP) Sensor

On top of the engine, at the rear of the intake manifold

Engine Controls Component Views

Engine Controls Connector End Views

Clutch/  Starter Interlock Switch

On the clutch pedal bracket

--

Engine Controls Connector End Views

Crankshaft Position (CKP) Sensor

At the bottom of the front timing cover

Engine Controls Component Views

Engine Controls Connector End Views

Cruise Control Switch

On the left side of the steering column

Cruise Control Component Views in Cruise Control

Cruise Control Connector End Views in Cruise Control

Data Link Connector (DLC)

Under the left side of the IP

Engine Controls Component Views

Engine Controls Connector End Views

Driver Information Center (DIC)

On the left side of the IP, part of the instrument panel cluster (IPC)

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges and Console

Engine Controls Connector End Views

Engine Coolant Temperature (ECT) Gauge Sensor

In the right hand cylinder head, above the spark plugs, between the #5 and #7 cylinder

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges and Console

Engine Controls Connector End Views

Engine Oil Pressure (EOP) Gauge Sensor

On the top rear of the engine near the bell housing

Engine Controls Component Views

Engine Controls Connector End Views

Evaporative Emmissions (EVAP) Canister Purge Valve

On the left side of the intake plenum

Engine Controls Component Views

Engine Controls Connector End Views

Exhaust Gas Recirculation (EGR) Valve

On the left side of the intake plenum

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Injectors

Under the intake plenum, in the intake manifold

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump Prime Connector

In the center of the IP, under the hazard switch

Engine Controls Component Views

--

Fuel Sender and Fuel Pump

On the outboard side of the left frame rail, in the fuel tank

Instrument Panel, Gages, and Console Component Views

Engine Controls Connector End Views

Fuse Block/ Mini-Relay Center

On the right side of the IP, under the access cover

Engine Controls Component Views

--

Heated Oxygen Sensor (HO2S) Bank 1

On the left exhaust pipe, below the exhaust manifold

Engine Controls Component Views

Engine Controls Connector End Views

Heated Oxygen Sensor (HO2S) Bank 2

On the right exhaust pipe, below the exhaust manifold

Engine Controls Component Views

Engine Controls Connector End Views

HI IDLE Switch

On the center of the IP

--

Engine Controls Connector End Views

IP Fuse Block

In the center of the IP, to the left of the instrument panel cluster (IPC)

--

--

Ignition Coils

On the left and right side valve covers

Engine Controls Component Views

Engine Controls Connector End Views

Instrument Panel Cluster (IPC)

In the left side of the IP

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges and Console

Engine Controls Connector End Views

Intake Air Temperature (IAT) Sensor

In the air duct, between the air filter housing and the throttle body, on the right side of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Knock Sensor (KS) Bank 1

In the engine block, left side below the exhaust manifold

Engine Controls Component Views

--

Knock Sensor (KS) Bank 2

In the engine block, right side below the exhaust manifold

Engine Controls Component Views

--

Manifold Absolute Pressure (MAP) Sensor

In the front center of the intake manifold, behind the water outlet

Engine Controls Component Views

Engine Controls Connector End Views

Mass Air Flow (MAF)Sensor

In the air duct, between the air filter housing and the throttle body, on the right side of the engine

Engine Controls Component Views

Engine Controls Connector End Views

Multifunction Alarm

In the center of the IP, behind the right access panel

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges and Console

Engine Controls Connector End Views

Neutral Switch (Automatic Transmission)

On the lower right side of the transmission

--

Engine Controls Connector End Views

Powertrain Control Module (PCM)

Under the left front cowl in front of driver

Engine Controls Component Views

Engine Controls Connector End Views

Speedo Adapter

In the right side of the IP under the underhood fuse block/ mini-relay center

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges and Console

Engine Controls Connector End Views

Starter Relay

In the hazard lamps/flasher relay center

--

Engine Electrical Connector End Views in Engine Electrical

Stoplamps Switch

Under the IP, on the pedal support bracket

Engine Controls Component Views

Engine Controls Connector End Views

Stoplamps Switch Interface Module

In the center of the IP mounted on the shelf

--

Engine Controls Connector End Views

Throttle Actuator Control (TAC) Module

In the center of the IP mounted on the shelf

Engine Controls Component Views

Engine Controls Connector End Views

Throttle Body

On top of the intake manifold

Engine Controls Component Views

--

Throttle Position (TP) Sensor

On the front of the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Throttle Actuator

On the rear of the throttle body

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Speed Sensor (VSS) (Automatic Transmission)

On the lower right side of the transmission tailshaft housing

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges and Console

Engine Controls Connector End Views

Vehicle Speed Sensor (VSS) (Manual Transmission)

On the lower right side of the transmission tailshaft housing

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges and Console

Engine Controls Connector End Views

C109

Engine harness to the bank  1 ignition coil harness

--

Inline Harness Connector End Views in Wiring Systems

C110

Engine harness to the even bank 2 ignition coil harness

--

Inline Harness Connector End Views in Wiring Systems

C116

In the engine harness at the right frame rail, near the starter

--

Inline Harness Connector End Views in Wiring Systems

C118

Engine harness to the crankshaft position sensor harness

--

Inline Harness Connector End Views in Wiring Systems

C127

On the engine harness, to the fuel injector harness, at the rear of the engine

--

Inline Harness Connector End Views in Wiring Systems

C200

In the IP harness, to the engine harness, under the right side of the IP

--

Inline Harness Connector End Views in Wiring Systems

C210

In the right center of the dash, behind IP fuse block

--

Inline Harness Connector End Views in Wiring Systems

C212 (Upfitter Connector)

Under the left side of the IP, by the left kick panel

--

Inline Harness Connector End Views in Wiring Systems

C215 (Automatic Transmission)

In the IP harness, to the clutch/ starter interlock switch jumper, near the brake pedal

--

Inline Harness Connector End Views in Wiring Systems

C408

In the engine harness, to the transmission harness, on the left side of the engine, at the bellhousing

--

Inline Harness Connector End Views in Wiring Systems

C409

In the engine harness, to the transmission harness, on the left side of the engine, at the bellhousing

--

Inline Harness Connector End Views in Wiring Systems

C415

In the engine harness, to the transmission harness, on the left side of the engine, at the bellhousing

--

Inline Harness Connector End Views in Wiring Systems

G106

From the engine harness to the left rear side of the left cylinder head

--

--

P100

On the right side of the IP bulkhead

--

--

P102

On the right side of the IP bulkhead

--

--

S138

In the engine harness, approximately 4 cm (2 in) from the generator harness breakout

--

--

S141

In the engine harness, approximately 17 cm (7 in) from the generator harness breakout

--

--

S142

In the engine harness, approximately 4 cm (2 in) from the throttle position (TP) sensor, toward the breakout

--

--

S176

In the engine harness, approximately 20 cm (8 in) from the injector harness connector breakout towards the powertrain control module (PCM)

--

--

S177

In the engine harness, approximately 26 cm (10 in) from the injector harness connector breakout towards the powertrain control module (PCM)

--

--

S178

In the bank 2 ignition coil harness, approximately 18 cm (7 in) from the C110 connector

--

--

S179

In the bank 1 ignition coil harness, approximately 15 cm (6 in) from the C109 connector

--

--

S180

In the bank 2 ignition coil harness, approximately 10 cm (4 in) to the rear of the #4 coil breakout

--

--

S181

In the bank 1ignition coil harness, approximately 36cm (14 in) from the C109 connector

--

--

S184

In the engine harness, approximately 13 cm (5 in) from the breakout in the harness for the mass air flow sensor (MAF)

--

--

S185

In the engine harness, approximately 13 cm(5 in) from the breakout in the harness for the starter solenoid

--

--

S186

In the engine harness, approximately 7 cm (3 in) from the P102 breakout toward P100

--

--

S187

In the fuel injector harness, approximately 8 cm (3 in) from the #5 injector breakout, toward the #3 injector

--

--

S188

In the fuel injector harness, approximately 7 cm (3 in) from the #6 injector breakout, toward the #4 injector

--

--

S210

In the IP harness, approximately 4 cm (2 in) to the right of the hazard warning switch breakout

--

--

S219

In the IP harness, approximately 17 cm (7 in) to the right of the data link connector (DLC) breakout

--

--

S220

In the IP harness, approximately 15 cm (6 in) to the right of the data link connector (DLC) breakout

--

--

S221

In the IP harness, approximately 12 cm (5 in) to the right of the data link connector (DLC) breakout

--

--

S230

In the IP harness, approximately 4 cm (2 in) to the right of the instrument panel cluster (IPC) connector breakout

--

--

S232

In the IP harness, approximately 59 cm (2 in) from the main harness, toward the IP harness connector

--

--