GM Service Manual Online
For 1990-2009 cars
Makes 🢒 Chevrolet 🢒 2004 🢒 C-Series Medium Duty Truck C6/7/8 - Mexico 🢒 Engine 🢒 Engine Controls - 8.1L 🢒 Engine Controls Component Views
Figure 1:

Vehicle Profile
Object Number: 689868 Size: MF
(1)Throttle Actuator Control (TAC) Module
(2)Fuel Pump and Sender Assembly
(3)EVAP Canister
(4)Data Link Connector (DLC)
(5)Powertrain Control Module (PCM)
Figure 2:

Intake Manifold Components
Object Number: 1430925 Size: SF
(1)Multiport Fuel Injectors
(2)Manifold Absolute Pressure (MAP) Sensor
(3)Evaporative Emission (EVAP) Canister Purge Solenoid
(4)Throttle Position (TP) Sensor
(5)Throttle Actuator Control (TAC) Motor
Figure 3:

Engine, Left Rear View
Object Number: 1430926 Size: MF
(1)Throttle Position (TP) Sensor
(2)Throttle Actuator Control (TAC) Motor
(3)Manifold Absolute Pressure (MAP) Sensor
(4)Engine Oil Pressure (EOP) Sensor
(5)Crankshaft Position (CKP) Sensor
(6)Ignition Coils
Figure 4:

Engine Block, Left Front View
Object Number: 689875 Size: SF
(1)Camshaft Position (CMP) Sensor
(2)Crankshaft Position (CKP) Sensor
(3)Knock Sensor (KS) 1
Figure 5:

Heated Oxygen Sensor, Bank 1
Object Number: 689878 Size: SF
(1)Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
(2)Exhaust Pipe
(3)Engine Exhaust Manifold
Figure 6:

Heated Oxygen Sensor, Bank 2
Object Number: 689880 Size: SF
(1)Engine Exhaust Manifold
(2)Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1
(3)Exhaust Pipe
Figure 7:

Automatic Transmission Harness --Typical-- without MTW/MX4/MWF
Object Number: 689497 Size: MF
(1)To Backup Lamp Switch
(2)Vehicle Speed Sensor (VSS)
(3)Automatic Transmission Modulator
(4)Neutral Safety Switch
(5)C408/C409
Figure 8:

Manual Transmission Harness, Left Forward View
Object Number: 689881 Size: MF
(1)Backup Lamp Switch
(2)Vehicle Speed Sensor (VSS) (JE4)
(3)Vehicle Speed Sensor (VSS) (JE3)
Figure 9:

Instrument Panel Harness to IP Mounted Components, Right Front View
Object Number: 689502 Size: MF
(1)Power Brake (P/B) Booster Pump Motor Relay
(2)Park Brake Pump Motor Relay
(3)Trailer Stop Lamp Relay
(4)Transmission Control Relay - MTW/MX4/Ignition Relay -- Engine Controls - L18
(5)ABS Relay Center
(6)Fuse Block 2 -- Underhood
(7)Fuse Block 1 -- Underhood
(8)C123
(9)C121
(10)Windshield Washer Fluid Pump
(11)Windshield Washer Reservoir
Figure 10:

Exterior Bulkhead, Right Side
Object Number: 689882 Size: SF
(1)Instrument Panel
(2)Powertrain Control Module (PCM)
Figure 11:

Instrument Panel Harness to Instrument Panel, Right Front View
Object Number: 689889 Size: LF
(1)Ignition Switch
(2)Park Brake Switch (JE3/J71)
(3)Turn Signal/Multifunction Switch C3
(4)Turn Signal/Multifunction Switch C2
(5)Turn Signal/Multifunction Switch C1
(6)Headlamp Dimmer Switch
(7)Turn Signal/Hazard Flasher Module
(8)Park/Neutral (PNP) Switch C3
(9)Park/Neutral (PNP) Switch C2
(10)Park/Neutral (PNP) Switch C1
(11)Accelerator Pedal Position (APP) Sensor
(12)Low Air Pressure Switch
(13)Stop Lamp Switch
Figure 12:

Fuel Pump Prime, Data Link Connector (DLC)
Object Number: 689888 Size: MF
(1)Instrument Panel
(2)Door Jamb Switch -- Driver
(3)Fuel Pump Prime Connector
(4)Data Link Connector (DLC)
(5)Headlamp Switch
(6)IP Dimmer Switch
Figure 13:

IP Harness to Components, Right View
Object Number: 689511 Size: MF
(1)Stop Lamp Switch Interface Module
(2)Convenience Center
(3)SERVICE TRANS FILTER Indicator Lamp
(4)Seat Belt Indicator Lamp
(5)Upfitter Accessory Feed Connector
(6)C210
(7)Upfitter AUX WRG Connector, Interior
(8)Daytime Running Lamps (DRL) Diode
(9)Blower Motor C1
(10)Blower Motor C2
(11)C208
(12)G210
(13)Speaker - RF
Figure 14:

Instrument Panel Components, Left Side
Object Number: 689885 Size: MF
(1)Air Suspension Dump Switch
(2)PTO Switch
(3)Instrument Panel
Figure 15:

Instrument Panel Harness to Components, Left Side of Cab
Object Number: 689891 Size: MF
(1)Multifunction Alarm Module
(2)Park Brake Control Module (PBCM)
Figure 16:

Lower Left Side of Cab Interior
Object Number: 689894 Size: SF
(1)Instrument Panel
(2)Accelerator Pedal Position (APP) Sensor
Figure 17:

Lower Right Side of Cab Interior
Object Number: 689896 Size: SF
(1)Throttle Actuator Control (TAC) Module
(2)Blower Motor Housing
(3)Throttle Actuator Control (TAC) Module Bracket
Figure 18:

Fuel Tank(s)
Object Number: 689528 Size: MF
(1)Fuel Pump Harness
(2)Fuel Pump and Sender Assembly -- Left
(3)Fuel Tank -- Left
(4)Fuel Sender and Balance Pump Control Module
(5)Fuel Sender and Balance Pump Control Relay
(6)C411
(7)Fuel Pump and Sender Assembly -- Right