GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Information Sensors/Input Devices


Object Number: 620845  Size: LF
(1)Fuel Tank Pressure Sensor (located rear of fuel tank)
(2)Heated Oxygen Sensor 1 (HO2S 1)
(3)Vehicle Speed Sensor (VSS)
(4)Mass Air Flow (MAF) Sensor
(5)Intake Air Temperature (IAT) Sensor
(6)Engine Coolant Temperature (ECT) Sensor
(7)Throttle Position (TP) Sensor
(8)PNP Switch
(9)Camshaft Position (CMP) Sensor
(10)Knock Sensor (KS)
(11)Crankshaft Position (CKP) Sensor
(12)PSP Switch
(13)A/C Compressor Control Module
(14)Heated Oxygen Sensor 2 (HO2S 2)
Figure 2:

PCM Controlled Devices


Object Number: 620852  Size: LF
(1)Ignition Coils
(2)EVAP Canister Vent Solenoid Valve
(3)Malfunction Indicator Lamp (MIL)
(4)Circuit Opening Relay (fuel pump)
(5)EVAP Canister Purge Solenoid Valve
(6)Idle Air Control (IAC) Valve
(7)Fuel Injectors
(8)Camshaft Position (CMP) Actuator Solenoid Valve
(9)A/C Compressor Control Module
Figure 3:

Other Components


Object Number: 239575  Size: LF
(1)EVAP Canister
(2)EVAP Pressure Switching Solenoid
(3)Data Link Connector (DLC) OBD 2
(4)Data Link Connector (under hood)
(5)EFI Relay
(6)Noise Filter (ignition)
(7)Powertrain Control Module (PCM)
Figure 4:

HO2S Sensors and Vehicle Speed Sensor (VSS)


Object Number: 326381  Size: MF
(1)Vehicle Speed Sensor (VSS)
(2)Heated Oxygen Sensor 1 (HO2S 1)
(3)Heated Oxygen Sensor 2 (HO2S 2)
Figure 5:

Crankshaft Position (CKP) Sensor and Power Steering Pressure (PSP) Switch


Object Number: 392655  Size: MF
(1)Generator
(2)Crankshaft Position (CKP) Sensor
(3)Power Steering Pump
(4)Power Steering Pressure (PSP) Switch
Figure 6:

Camshaft Position (CMP) Actuator Solenoid Valve and Filter


Object Number: 622392  Size: SH
(1)Camshaft Position (CMP) Actuator Solenoid Valve
(2)Camshaft Position (CMP) Actuator Solenoid Oil Filter
Figure 7:

Data Link Connector (Underhood), Fuse and Relay Block 1, Fuse and Relay Block 2


Object Number: 392650  Size: MF
(1)Air Cleaner
(2)Fuse and Relay Block 1
(3)Fuse and Relay Block 2
(4)Battery
(5)Data Link Connector (Underhood)
Figure 8:

EVAP Purge and Vent Solenoids


Object Number: 620844  Size: SF
(1)EVAP Canister Vent Solenoid Valve
(2)EVAP Service Port
(3)EVAP Canister Purge Solenoid Valve
Figure 9:

Ignition Coils


Object Number: 621682  Size: SH
(1)Ignition Coil 1
(2)Ignition Coil 2
(3)Ignition Coil 3
(4)Ignition Coil 4
Figure 10:

I/P Assembly Components


Object Number: 392644  Size: MF
(1)Hazard Switch
(2)Rear Defogger Switch
(3)Radio
(4)Overdrive Switch
(5)Noise Filter
(6)Powertrain Control Module (PCM)
(7)Junction Block 2
(8)Data Link Connector (DLC) OBD 2
(9)Junction Block 1
(10)Malfunction Indicator Lamp (MIL)
Figure 11:

Stoplamp Switch and CPP Switch (M/T only)


Object Number: 326561  Size: LF
(1)Cruise Control Release Switch (if equipped)
(2)Stoplamp Switch
(3)Clutch Pedal Position (CPP) Switch