GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Alternative Fuel Engine Control Module (AF ECM)

RH of the Engine Compartment, next to the battery

Engine Controls Component Views

Alternative Fuels Engine Control Module Connector End Views

Fuel Tank Pressure (FTP) Sensor

LH rear of the van on the end of the front CNG fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Tank Temperature (FTT) Sensor

LH rear of the van on the end of CNG fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Gage Relay

Center of the Engine Compartment, attached to the front of dash

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Gage Selector Switch/Fuel Indicator Lamp

Center of the engine cover trim panel

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pump Relay

Center of the Engine Compartment, attached to the front of dash

Engine Controls Component Views

Engine Controls Connector End Views

High Pressure Lock-Off (HPL) Solenoid

LH rear of the van on the end of each CNG fuel tank

Engine Controls Component Views

Engine Controls Connector End Views

Ignition Relay

Center of the Engine Compartment, attached to the front of dash

Engine Controls Component Views

Engine Controls Connector End Views

Lock-Off Relay

Center of the Engine Compartment, attached to the front of dash

Engine Controls Component Views

Engine Controls Connector End Views

Low Pressure Lock-Off (LPL) Solenoid

Rear middle of the Engine

Engine Controls Component Views

Engine Controls Connector End Views

C001

RH of the Engine Compartment at the AF ECM (Clear 32-Way)

Engine Controls Component Views

Alternative Fuels Engine Control Module Connector End Views

C002

RH of the Engine Compartment at the AF ECM (Blue 32-Way)

Engine Controls Component Views

Alternative Fuels Engine Control Module Connector End Views

C003

LH of the Engine Compartment near the brake master cylinder (BLK 4-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C005

LH rear of the Engine at the Fuel Control Solenoid (BLK 2-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C006

LH rear of the Engine at the Idle Control Solenoid (Red 2-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C007

LH of the Engine Compartment near the brake master cylinder (BLK 6-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C008

LH of the Engine Compartment near the brake master cylinder (GRY 10-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C009

LH of the Engine Compartment near the brake master cylinder (BLK 10-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C010

Center of the Engine Compartment, attached to the front of dash at the AF Fuel Pump Relay (BLK 5-Way Relay)

Engine Controls Component Views

Engine Controls Connector End Views

C011

Center of the Engine Compartment, attached to the front of dash at the Fuel gage Relay (BLK 5-Way Relay)

Engine Controls Component Views

Engine Controls Connector End Views

C012

Center of the Engine Compartment, attached to the front of dash at the Ignition Relay (BLK 5-Way Relay)

Engine Controls Component Views

Engine Controls Connector End Views

C013

Center of the Engine Compartment, attached to the front of dash at the Lock-off Relay (BLK 5-Way Relay)

Engine Controls Component Views

Engine Controls Connector End Views

C014

Rear middle of the Engine at the Low Pressure Lock-off (BLK 2-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C015

LH frame rail behind left door (BLK 6-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C016

Center of the engine cover trim panel at the fuel gage select switch (GRY 6-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C018

LH rear of the van on the end of the front CNG fuel tank (BLK 2-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C019

LH rear of the van on the end of the rear CNG fuel tank (BLK 2-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C020

LH rear of the van on the end of the front CNG fuel tank (GRY 2-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C021

LH rear of the van on the end of the front CNG fuel tank (GRY 3-Way)

Engine Controls Component Views

Engine Controls Connector End Views

G103

Center rear of the Engine, at a Transmission bellhousing bolt

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P001

30.5 cm (12 in) from the In-line Connector harness breakout near the master cylinder at the front of dash

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S001

Alternative Fuels Harness, 48.3 cm (19 in) from C005 towards the LPL, ICS, FCS harness breakout

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S002

Not Used

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S003

Alternative Fuels Harness, 33.1 cm (13 in) from C005 towards the LPL, ICS, FCS harness breakout

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S004

Alternative Fuels Harness, 48.3 cm (19 in) from C005 towards the LPL, ICS, FCS harness breakout

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S005

Alternative Fuels Harness, 33.1 cm (13 in) from C005 towards the LPL, ICS, FCS harness breakout

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S006

Alternative Fuels Harness, 10.2 cm (4 in) from the LPL, ICS, FCS harness breakout towards C008

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S007

Alternative Fuels Harness, 15.2 cm (6 in) from the LPL, ICS, FCS harness breakout towards the AF Relay harness breakout

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S008

Alternative Fuels Harness, 10.2 cm (4 in) from the LPL, ICS, FCS harness breakout towards the AF Relay harness breakout

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S009

Alternative Fuels Harness, 17.8 cm (7 in) from C005 towards the LPL, ICS, FCS harness breakout

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S010

Alternative Fuels Harness, 7.6 cm (3 in) from the AF Relay harness breakout towards the LPL, ICS, FCS harness breakout

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S011

Alternative Fuels Harness, 17.8 cm (7 in) from C005 towards the LPL, ICS, FCS harness breakout

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S012

Alternative Fuels Harness, 17.8 cm (7 in) from the LPL, ICS, FCS harness breakout towards C005

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S013

Alternative Fuels Harness, 50.8 cm (20 in) from the HPL, FTP and FTT harness breakout towards C015

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S014

Alternative Fuels Harness, 76.2 cm (30 in) from the HPL, FTP and FTT harness breakout towards C015

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S015

Alternative Fuels Harness, 50.8 cm (20 in) from the HPL, FTP and FTT harness breakout towards C015

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S016

Alternative Fuels Harness, 66 cm (26 in) from the HPL, FTP and FTT harness breakout towards C015

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S017

Engine Harness, 14 cm (5.5 in) from the In-line Connector (C009) harness breakout towards the TP, IAC, EGR harness breakout

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S018

Engine Harness, 20 cm (7.9 in) from the MAF, IAT, A/C and Generator harness breakout towards the IAT sensor

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S019

Engine Harness, 20.5 cm (8.07 in) from the In-line Connector (C009) harness breakout towards the TP, IAC, EGR harness breakout

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S020

Engine Harness, 5 cm (2 in) from the fuel injector connector harness breakout towards the MAP sensor

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S021

Engine Harness, 15 cm (6 in) from the fuel injector connector harness breakout towards the MAP sensor

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S022

Engine Harness, 10 cm (4 in) from the fuel injector connector harness breakout towards the MAP sensor

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S023

Engine Harness, 32 cm (12.5 in) from the MAF sensor connector

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S024

Engine Harness, 15 cm (5.9 in) from the fuel injector connector harness breakout towards the MAF, IAT, A/C and Generator harness breakout

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S025

Engine Harness, 13 cm (5.1 in) from the Underhood Fuse Relay Center harness breakout towards C100

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S026

Engine Harness, 8 cm (3.1 in) from the Park/Neutral switch connector breakout towards the EVAP Vent Valve, HO2S and Brake Differential switch harness breakout

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S027

Engine Harness, 10 cm (4 in) from the EVAP Vent Valve, HO2S and Brake Differential switch harness breakout towards the HO2S

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S028

Engine Harness, 18 cm (7.08 in) from the MAF, IAT, A/C and Generator harness breakout towards the TP, IAC, EGR harness breakout

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S029

Engine Harness, 8 cm (3.14 in) from the MAF, IAT, A/C and Generator harness breakout towards the TP, IAC, EGR harness breakout

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S030

Not Used

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S031

Alternative Fuels Harness, 45.7 cm (18 in) from the HPL, FTP and FTT harness breakout towards C015

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S032

Alternative Fuels Rear Harness, 30.7 cm (12 in) from C019

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S033

Alternative Fuels Rear Harness, 27.8 cm (10.9 in) from C019

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AF D1 (DIODE)

Alternative Fuels Harness, 48.3 cm (19 in) from C005

Engine Controls Component Views

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AF D2 (DIODE)

Alternative Fuels Harness, 33.1 cm (13 in) from C005

Engine Controls Component Views

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AF D3 (DIODE)

Alternative Fuels Harness, 17.8 cm (7 in) from C005

Engine Controls Component Views

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AF D4 (DIODE)

Alternative Fuels Rear Harness, 50.8 cm (20 in) from the HPL, FTP and FTT harness breakout towards C015

Engine Controls Component Views

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AF D5 (DIODE)

Alternative Fuels Rear Harness, 29.2 cm (11.5 in) from C019

Engine Controls Component Views

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