GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Alternative Fuel Engine Control Unit (AF ECU)

LH front corner behind headlamp

Engine Controls Component Views

Engine Control Unit Connector End Views

AF fuel pump relay

LH front corner behind headlamp

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Pressure Sensor (FPS)

Left side of trunk compartment

Engine Controls Component Views

Engine Controls Connector End Views

Fuel Temperature Sensor (FTS)

Left side of trunk compartment

Engine Controls Component Views

Engine Controls Connector End Views

Fuel gauge relay

LH front corner behind headlamp

Engine Controls Component Views

Engine Controls Connector End Views

Fuel gauge selector switch/fuel indicator lamp

LH IP

Engine Controls Component Views

Engine Controls Connector End Views

20A CNG Fuse

In engine compartment fuse/relay center

Engine Controls Component Views

--

40A COOLING FAN/CNG Fuse

In engine compartment fuse/relay center

Engine Controls Component Views

--

10A PCM Fuse

In IP fuse block

--

--

Gas Mass Sensor/Mixture Control Valve (GMS/MCV)

Top center of engine

Engine Controls Component Views

Engine Controls Connector End Views

High Pressure Lock-off (HPL)

LH side of trunk compartment

Engine Controls Component Views

Engine Controls Connector End Views

Ignition relay

LH front corner behind headlamp

Engine Controls Component Views

Engine Controls Connector End Views

Lock-off relay

LH front corner behind headlamp

Engine Controls Component Views

Engine Controls Connector End Views

Low Pressure Lock-off (LPL)

Top right of the engine

Engine Controls Component Views

Engine Controls Connector End Views

C001

LH front corner behind headlamp at AF ECU

Engine Controls Component Views

Engine Control Unit Connector End Views

C002

LH front corner behind headlamp at AF ECU

Engine Controls Component Views

Engine Control Unit Connector End Views

C004

LH front corner behind headlamp

Engine Controls Component Views

Engine Controls Connector End Views

C007

LH front corner behind headlamp

Engine Controls Component Views

Engine Controls Connector End Views

C010

Top center of the engine at GMS

Engine Controls Component Views

Engine Controls Connector End Views

C011

LH front corner behind headlamp

Engine Controls Component Views

Engine Controls Connector End Views

C012

LH front corner behind headlamp

Engine Controls Component Views

Engine Controls Connector End Views

C014

Top right of engine at low pressure lock-off

Engine Controls Component Views

Engine Controls Connector End Views

C017

Top left of engine (Gray 10-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C018

Top left of engine (Black 10-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C019

Top left of engine (Black 6-Way)

Engine Controls Component Views

Engine Controls Connector End Views

C021

Top center of the engine at the MCV

Engine Controls Component Views

Engine Controls Connector End Views

C200

LH front of passenger compartment

Engine Controls Component Views

Engine Controls Connector End Views

C250

LH front of passenger compartment

Engine Controls Component Views

Engine Controls Connector End Views

C251

LH front of passenger compartment

Engine Controls Component Views

Engine Controls Connector End Views

C253

LH front of passenger compartment

Engine Controls Component Views

Engine Controls Connector End Views

C254

LH IP

Engine Controls Component Views

Engine Controls Connector End Views

C450

LH trunk compartment

Engine Controls Component Views

Engine Controls Connector End Views

C451

LH trunk compartment

Engine Controls Component Views

Engine Controls Connector End Views

C452

LH trunk compartment

Engine Controls Component Views

Engine Controls Connector End Views

C453

LH trunk compartment

Engine Controls Component Views

Engine Controls Connector End Views

C454

LH trunk compartment

Engine Controls Component Views

Engine Controls Connector End Views

G112

LH engine/transmission

Engine Controls Component Views

Engine Controls Connector End Views

P001

LH lower IP below steering column

Engine Controls Component Views

--

P401

LH trunk compartment at CNG tank vent boot cover

Engine Controls Component Views

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S001

In the AF Harness, approximately 3.5 cm (1.5 in) from the four relay breakouts, toward the ECU connector breakouts

--

--

S002

In the AF Harness, approximately 6.5 cm (2.5 in) from the AF ECU connector breakouts, toward P001

--

--

S003

In the AF Harness, approximately 45.0 cm (18 in) from P001.

--

--

S005

In the AF Harness, approximately 60.0 cm (24 in) from P001

--

--

S006

In the AF Harness, approximately 45.0 cm (18 in) from G112

--

--

S007

In the AF Harness, approximately 26.5 cm (10 in) from the AF ECU connector breakouts, toward P001

--

--

S008

In the AF Harness, approximately 16.5 cm (6.5 in) from LPL connector

--

--

S009

In the AF Harness, approximately 10.0 cm (4 in) from LPL connector

--

--

S010

In the AF Engine Harness in CMP Sensor breakout, approximately 10.0 cm (4 in) from main engine sensor breakout

--

--

S011

In the AF Engine Harness, approximately 16.5 cm (6.5 in) from IAT sensor breakout, towards oxygen sensor breakout

--

--

S012

In the AF Engine Harness, approximately 19 cm (7.5 in) from TCC Valve breakout, towards Engine Compartment Fuse/Relay Center

--

--

S013

In the AF Engine Harness, approximately 24.5 cm (10 in) from Engine Compartment Fuse/Relay Center

--

--

S014

In the AF Engine Harness, approximately 23 cm (9 in) from IAT Sensor breakout, towards oxygen sensor breakout

--

--

S015

In the AF Engine Harness, approximately 29.5 cm (12 in) from IAT Sensor breakout, towards oxygen sensor breakout

--

--

S016

In the AF Engine Harness, approximately 6.5 cm (2.5 in) from EVAP/ECT sensor breakout, towards main engine sensor breakout

--

--

S017

In the AF Engine Harness, approximately 16 cm (6 in) from ECT Sensor connector

--

--

S018

In the AF Engine Harness, approximately 15 cm (6 in) from IAT Sensor connector

--

--

S019

In the AF Engine Harness, approximately 32.5 cm (13 in) from EVAP/ECT breakout, towards main engine sensor breakout

--

--

S020

In the AF Engine Harness, approximately 19.5 cm (8 in) from EVAP/ECT breakout, towards main engine sensor breakout

--

--

S021

In the AF Engine Harness, approximately 26 cm (10 in) from EVAP/ECT breakout, towards main engine sensor breakout

--

--

S022

In the AF Engine Harness, approximately 10 cm (4 in) from IAT breakout, towards oxygen sensor breakout

--

--

S023

In the AF Engine Harness, approximately 25.5 cm (10 in) from the TCC Valve breakout, towards the Engine Compartment Fuse/Relay Center

--

--

S024

In the AF Engine Harness, approximately 34.5 cm (14 in) from IAC Sensor connector

--

--

S025

In the AF Engine Harness, approximately 28 cm (11 in) from IAC valve connector

--

--

S026

In the AF Engine Harness, approximately 21.5 cm (9 in) from IAC valve connector

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--

S027

In the AF Engine Harness, approximately 15 cm (6 in) from IAC valve connector

--

--

S028

In the AF Harness, approximately 14 cm (6 in) from ignition relay connector

--

--

S029

In the AF Harness, approximately 14 cm (6 in) from ignition relay connector

--

--

S107

In the AF Engine Harness, front left side of car, approximately 34 cm (13 in) from Engine Compartment Fuse/Relay Center

--

--

S121

In the AF Engine Harness, front of engine, approximately 27 cm (11 in) from C100

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--

S450

In the AF Harness, approximately 7.5 cm (3 in) from HPL connector

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--

S451

In the AF Harness, approximately 14 cm (6 in) from HPL connector

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--

AF D1

In the AF Harness, approximately 13 cm (5 in) from LPL connector

--

--

AF D2

In the AF Harness, approximately 11 cm (4 in) from HPL connector

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--

AF D3

In the AF Harness, approximately 14 cm (6 in) from ignition relay connector

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