GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Express (CNG) 🢒 Engine 🢒 Engine Controls - 5.0L and 5.7L 🢒 Engine Controls Component Views
Figure 1:

Alternative Fuels Electrical System (1 of 3)
Object Number: 739877 Size: LF
(1)Connector C015
(2)Left Side Vehicle Frame
(3)Connector C003
(4)Connector C007
(5)Connector C008
(6)Connector C009
(7)Alternative Fuels Engine Control Module (AF ECM)
(8)Alternative Fuels Engine Control Module Connector C002
(9)Connector Position Assurance (CPA) Clips
(10)Alternative Fuels Engine Control Module Connector C001
Figure 2:

Alternative Fuels Electrical System (2 of 3)
Object Number: 739878 Size: LF
(1)Engine Cover Trim Plate
(2)Fuel Gage Select Switch / Fuel Indicator Lamp Connector C016
(3)Throttle Body Adapter
(4)Low Pressure Regulator
(5)Idle Control Solenoid (ICS) Connector C006
(6)Fuel Control Solenoid (FCS) Connector C005
(7)Low Pressure Lock-Off (LPL) Solenoid
(8)Low Pressure Lock-Off (LPL) Solenoid Connector C014
(9)Fuel Gage Relay Connector C011
(10)Alternative Fuels Fuel Pump Relay Connector C010
(11)Ignition Relay Connector C012
(12) Lock-Off Relay Connector C013
Figure 3:

Alternative Fuels Electrical System (3 of 3)
Object Number: 739879 Size: LF
(1)Front Fuel Tank Temperature (FTT) Sensor Connector C020
(2)Rear Fuel Tank High Pressure Lock-Off (HPL) Connector C019
(3)Rear Fuel Tank High Pressure Lock-Off (HPL) Solenoid
(4)Rear Fuel Tank Temperature (FTT) Sensor Connector - No Connection
(5)Fuel Tank Pressure (FTP) Sensor Connector C021
(6)Front Fuel Tank High Pressure Lock-Off (HPL) Connector C018
(7)Front Fuel Tank High Pressure Lock-Off (HPL) Solenoid
Figure 4:

Alternative Fuels System (1 of 2)
Object Number: 739880 Size: LF
(1)Left Side Frame Rail
(2)High Pressure Regulator (HPR)
(3)High Pressure Regulator (HPR) Mounting Bracket
(4)Low Pressure Regulator (LPR)
(5)Low Pressure Lock-Off (LPL) Solenoid
(6)Low Pressure Lock-Off (LPL) Solenoid Connector
(7)Air Cleaner Outlet Duct-Intake Bonnet
(8)Air Mixer
(9)Throttle Body Adapter
Figure 5:

Alternative Fuels System (2 of 2)
Object Number: 739881 Size: LF
(1)Fuel Fill Mounting Cup
(2)Fuel Fill Valve
(3)Rear Tank High Pressure Lock-Off (HPL) Solenoid
(4)Front Tank High Pressure Lock-Off (HPL) Solenoid