GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

AF Fuel Mode Relay

AF Relay Block Left--Underhood

Engine Controls Component Views

Engine Controls Connector End Views

AF Lock-off Relay

Left side of engine compartment attached to fuse block--underhood

Engine Controls Component Views

Engine Controls Connector End Views

AFS/ Ign 0 Fuse

In fuse block--left I/P

Engine Controls Component Views

--

AFS/ PCM1 Fuse

In fuse block--underhood

Engine Controls Component Views

--

AFS/ 4WS Fuse

In fuse block--underhood

Engine Controls Component Views

--

Fuel Gage Selector Switch

Right side of I/P below radio

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Injector Control Module (FICM)

Right side of engine compartment below the air filter assembly

Engine Controls Component Views

Fuel Injector Control Module Connector End Views

Fuel Rail Pressure (FRP) Sensor

Center of CNG fuel rail--Left

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Rail Temperature (FRT) Sensor

Center of CNG fuel rail--Right

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Tank Pressure (FTP) Sensor

Threaded into HPL

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Tank Temperature (FTT) Sensor

Non-serviceable part of HPL

Engine Controls Component Views

Engine Controls Connector End Views

High Pressure Lock-off (HPL)

Threaded into CNG tank end

Engine Controls Component Views

Engine Controls Connector End Views

High Pressure Regulator (HPR)

Attached to CNG fuel tank lower support bracket

Engine Controls Component Views

--

Injector Power Relay--Even Bank

AF Relay Block Right--underhood (KL6)

Attached to left fender to cowl support brace (KL8)

Engine Controls Component Views

Engine Controls Connector End Views

Injector Power Relay--Odd Bank

AF Relay Block Left--underhood (KL6)

Attached to left fender to cowl support brace (KL8)

Engine Controls Component Views

Engine Controls Connector End Views

Injector Relays #1,3,5,7

AF Relay Block Left--underhood

Engine Controls Component Views

Engine Controls Connector End Views

Injector Relays #2,4,6,8

AF Relay Block Right--underhood

Engine Controls Component Views

Engine Controls Connector End Views

Inline AF Fuses

Left side of engine compartment attached to rear of fuse block--underhood cover

--

--

Intermediate Pressure Regulator (IPR)

Left side of engine above valve rocker cover

Engine Controls Component Views

--

Low Pressure Lock-off (LPL)

Left side of engine above valve rocker cover

Engine Controls Component Views

Engine Controls Connector End Views

C001

Right side of engine compartment below the air filter assembly at FICM

Engine Controls Component Views

Fuel Injector Control Module Connector End Views

C002

Left side of engine compartment near fuse block--underhood FICM harness breakout

Engine Controls Component Views

Engine Controls Connector End Views

C003

Left side of engine compartment near fuse block--underhood FICM harness breakout

Engine Controls Component Views

Engine Controls Connector End Views

C004

Left side of engine compartment near fuse block--underhood FICM harness breakout

Engine Controls Component Views

Engine Controls Connector End Views

C005

Left side of engine compartment near fuse block--underhood engine harness breakout (KL6)

Engine Controls Component Views

Engine Controls Connector End Views

C006

Left side of engine compartment attached to IPR/LPL mounting bracket

Engine Controls Component Views

Engine Controls Connector End Views

C007

Right rear side of engine near transmission dipstick tube

--

Engine Controls Connector End Views

C008

Left side of engine compartment near fuse block--underhood FICM harness breakout

Engine Controls Component Views

Engine Controls Connector End Views

C009

Behind truck cab attached to left front pickup box support frame

--

Engine Controls Connector End Views

C010

Left side of engine compartment near throttle actuator motor (TAC) module harness breakout

--

Engine Controls Connector End Views