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HOMESERVICE MANUALSCHEVROLET2001C3500 HD 8.1 G, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - 6.5L (L65) (INTRODUCTION)COMPONENT LOCATORENGINE CONTROLS CONNECTOR END VIEWS

2001 Chevrolet C3500 HD 8.1 G, Automatic

Engine Controls Connector End Views

2001 Chevrolet C3500 HD 8.1 G, AutomaticSECTION Engine Controls Connector End Views

Accelerator Pedal Position (APP) Sensor

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12065425 10 Way F Metri-pack 150 Series (BLK)
Pin	Wire Color	Circuit No.	Function
A	BRN	1271	Low Reference
B	PPL	1272	Low Reference
C	LT BLU	1162	APP Sensor 2 Signal
D	TAN	1274	5 Volt Reference
E	YEL/BLK	1275	5 Volt Reference
F	DK BLU	1161	APP Sensor 1 Signal
G	WHT/BLK	1164	5 Volt Reference
H	-	-	Not Used
J	GRY	1273	Low Reference
K	DK GRN	1163	APP Sensor 3 Signal

Automatic Transmission Input Shaft Speed (ISS) Sensor

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12162194 2 Way F Metri-pack 150.2 Series P2S (BLK)
Pin	Wire Color	Circuit No.	Function
A	RED/BLK	1230	AT ISS High Signal
B	DK BLU/WHT	1231	AT ISS Low Signal

Crankshaft Position (CKP) Sensor

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12110293 3 Way F Metri-pack 150 Series (BLK)
Pin	Wire Color	Circuit No.	Function
A	YEL	573	CKP Sensor Signal
B	PPL	452	Low Reference
C	GRY	416	5 Volt Reference

Engine Coolant Temperature (ECT) Sensor

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12162194 2 Way F Metri-pack 150.2 Series P2S (BLK)
Pin	Wire Color	Circuit No.	Function
A	YEL	410	ECT Sensor Signal
B	BLK	452	Low Reference

Engine Oil Pressure (EOP) Sensor and Fuel Pump Switch

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12065401 4 Way F Metri-pack 150 Series (MD GRY)
Pin	Wire Color	Circuit No.	Function
A	TAN	31	Oil Pressure Indicator Control
B	-	-	Not Used
C	GRY	120	Fuel Pump Supply Voltage
D	ORN	440	Battery Positive Voltage

Fuel Level Sensor (Single Tank)

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12010973 2 Way M Weather-pack SHD Type (BLK)
Pin	Wire Color	Circuit No.	Function
A	BLK/WHT	451	Ground
B	PPL	30	Fuel Level Sensor Signal

Fuel Pump

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12010973 2 Way M Weather-pack SHD Type (BLK)
Pin	Wire Color	Circuit No.	Function
A	BLK	150	Ground
B	GRY	120	Fuel Pump Supply Voltage

Fuel Level Sensor - Primary (Dual Tanks)

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12010973 2 Way M Weather-pack SHD Type (BLK)
Pin	Wire Color	Circuit No.	Function
A	BLK/WHT	451	Ground
B	DK BLU/WHT	970	Fuel Level Signal - Primary

Fuel Level Sensor - Secondary (Dual Tanks)

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12162188 4 Way F Metri-pack 150.2 Series P2S
Pin	Wire Color	Circuit No.	Function
A	BLK/WHT	451	Ground
B-C	-	-	Nor Used
D	LT BLU	975	Fuel Level Signal - Secondary

Fuel Pump - Secondary

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12010973 2 Way M Weather-pack SHD Type (BLK)
Pin	Wire Color	Circuit No.	Function
A	BLK	150	Ground
B	LT GRN	1058	Fuel Balance Pump Supply Voltage

Fuel Balance Module (Dual Tanks)

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12059573 6 Way F Metri-pack 280 Series (BLK)
Pin	Wire Color	Circuit No.	Function
A	PNK	639	Ignition 1 Voltage
B	LT BLU	975	Fuel Level Signal - Secondary
C	DK BLU/WHT	970	Fuel Level Signal - Primary
D	LT GRN	497	Fuel Pump Relay Control - Secondary
E	BLK/WHT	451	Ground
F	PPL	30	Fuel Level Signal

Fuel Balance Pump Relay (Dual Tanks)

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12129716 4 Way F Metri-pack 280 Series (GRY)
Pin	Wire Color	Circuit No.	Function
30	PNK	639	Ignition 1 Voltage
85	GRY	120	Fuel Pump Supply Voltage
86	LT GRN	497	Fuel Pump Relay Control - Secondary
87	LT GRN	1058	Fuel Balance Pump Supply Voltage

Fuel Heater

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12020397 3 Way F Metri-pack 280 Series (BLK)
Pin	Wire Color	Circuit No.	Function
A	BLK	550	Ground
B	-	-	Not Used
C	PNK	539	Ignition 1 Voltage

Fuel Solenoid Driver

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12186568 4 Way F Metri-pack 150 Series (BLK)
Pin	Wire Color	Circuit No.	Function
A	LT GRN	260	Fuel Injection Control
B	BLK	491	Low Reference
C	PNK	439	Ignition 1 Voltage
D	RED	313	Injection Pump Timing Signal

Fuel Temperature Sensor

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12052848 6 Way F Metri-pack 150 Series (BLK)
Pin	Wire Color	Circuit No.	Function
A	GRY	474	5 Volt Reference
B	BRN/WHT	633	CMP Sensor Signal
C	ORN	1799	High Resolution Signal
D	PNK/BLK	632	Low Reference
E	YEL	1578	Fuel Temperature Signal
F	PNK/BLK	632	Low Reference

Glow Plug Relay

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12045636 4 Way F Metri-pack 280 Series (MD GRY)
Pin	Wire Color	Circuit No.	Function
A	PNK	539	Ignition 1 Voltage
B	YEL	505	Glow Plug Relay Control
C	BLK	150	Ground
D	-	-	Not Used

Injection Timing Stepper Motor

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12162189 4 Way F Metri-pack 150.2 Series P2S (BLK)
Pin	Wire Color	Circuit No.	Function
A	TAN/BLK	1030	ITS Coil 1 Low
B	ORN/BLK	1032	ITS Coil 2 Low
C	YEL/BLK	1033	ITS Coil 2 High
D	RED/BLK	1031	ITS Coil 1 High

Intake Air Temperature (IAT) Sensor

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12162198 2 Way F Metri-pack 150.2 Series P2S (GRY)
Pin	Wire Color	Circuit No.	Function
A	TAN	472	IAT Sensor Signal
B	BLK	452	Low Reference

Turbocharger Boost Sensor

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12103771 3 Way M Weather-pack TWR Type (WHT)
Pin	Wire Color	Circuit No.	Function
A	BLK	452	Low Reference
B	LT GRN	432	MAP Sensor Signal
C	GRY	416	5 Volt Reference

Turbocharger Wastegate Solenoid

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12052641 2 Way F Metri-pack 150 Series (BLK)
Pin	Wire Color	Circuit No.	Function
A	PNK	539	Ignition 1 Voltage
B	YEL	258	Wastegate Solenoid Control

Vehicle Speed Sensor (VSS) - M/T

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12124819 2 Way F Metri-pack 280 Series (BLK)
Pin	Wire Color	Circuit No.	Function
A	PPL/WHT	821	VSS High Signal
B	LT GRN/BLK	822	VSS Low Signal

Vehicle Speed Sensor (VSS) - A/T

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12162194 2 Way F Metri-pack 150.2 Series (BLK)
Pin	Wire Color	Circuit No.	Function
A	PPL/WHT	821	VSS High Signal
B	LT GRN/BLK	822	VSS Low Signal

Vehicle Speed Sensor (VSS) Buffer

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12066130 9 Way F Micro-pack 100 Series (NAT)
Pin	Wire Color	Circuit No.	Function
7	LT GRN/BLK	822	VSS Low Signal
8	BLK/WHT	451	Ground
9	PNK	39	Ignition 1 Voltage
10	YEL/BLK	1827	Vehicle Speed Signal
11	-	-	Not Used
12	PPL/WHT	821	VSS High Signal
13	BRN	437	Vehicle Speed Signal
14	DK GRN/WHT	817	Vehicle Speed Signal
15	DK GRN	389	Vehicle Speed Signal

Water In Fuel Sensor

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12015793 3 Way F Weather-pack TWR Type (BLK)
Pin	Wire Color	Circuit No.	Function
A	PNK	539	Ignition 1 Voltage
B	YEL/BLK	508	Water In Fuel Indicator Control
C	BLK	150	Ground

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.