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

Alternative Fuels Engine Control Unit (AF ECU)


Object Number: 296416  Size: SH
(1)AF ECU
(2)AF ECU Connector -- C003 Clear
(3)AF ECU Connector -- C002 Red
(4)AF ECU Connector -- C001 Blue
Figure 2:

Alternative Fuels (AF) Underhood Fuse/Relay Center (1997)


Object Number: 296411  Size: SH
(1)Fuel Pump Relay
(2)Fuse 1 20 amp (Power)
(3)Fuel Gauge Relay
(4)Fuse 2 10 amp (Ignition)
(5)Lock-off Relay
(6)Ignition Relay
Figure 3:

Fuel Sending Unit and High Pressure Lock-Off


Object Number: 296428  Size: SH
(1)High Pressure Lock-off (HPL) Connector - C313
(2)Fuel Sending Unit (FSU) Connector - C315
Figure 4:

Gas Mass Sensor/Mixture Control Valve


Object Number: 296415  Size: SH
(1)GMS/MCV
(2)MCV Connector -- C021 Black
(3)GMS Connector -- C010 Black
(4)LPL Connector -- C014 Black
(5)LPL
Figure 5:

In-Line Engine Harness Connectors


Object Number: 296418  Size: SH
(1)10-Way In-Line Connector -- C017 Gray
(2)10-Way In-Line Connector -- C018 Black
(3)Not Used
Figure 6:

Instrument Panel Connections


Object Number: 296430  Size: SH
(1)Cargo Lamp Switch Connector -- C212 Black
(2)Fuel Gauge Selector Switch/Fuel Indicator Lamp Connector -- C239 Gray
Figure 7:

IP and Rear Lamp Connectors


Object Number: 296419  Size: SH
(1)In-Line Engine Harness Connector - C103 Gray
(2)In-Line IP Harness Connector - C104 Gray
Figure 8:

Wire Harness Ground Connection


Object Number: 296421  Size: SH
(1)Engine Ground -- G103