Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1410 (ENGINE CONTROL SYSTEM - 4.2L (INTRODUCTION))COMPONENT LOCATORENGINE CONTROLS CONNECTORS

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Engine Controls Connectors

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Engine Controls Connectors

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Accelerator Pedal Position (APP) Sensor Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15326830 6-Way F GT 150 Sealed (BK)
Pin	Wire Color	Circuit No.	Function
A	PU	1272	Low Reference
B	L-BU	1162	APP Sensor 2 Signal
C	TN	1274	5-Volt Reference
D	BN	1271	Low Reference
E	D-BU	1161	APP Sensor 1 Signal
F	WH/BK	1164	5-Volt Reference

Camshaft Actuator Solenoid Assembly Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15326801 2-Way F GT 150 Series (BK)
Pin	Wire Color	Circuit No.	Function
A	BN	2198	Camshaft Position Solenoid Actuator High Control
B	BK	2199	Low Reference

Camshaft Position (CMP) Sensor Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15355370 3-Way F GT 150 Sealed 3.2 X 4.0 (BK)
Pin	Wire Color	Circuit No.	Function
A	RD	631	12-Volt Reference
B	BN/WH	633	CMP Sensor Signal
C	PK/BK	632	Low Reference

Crankshaft Position (CKP) Sensor Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15336004 2-Way F GT 150 Sealed 3.2 X 4.0 (BK)
Pin	Wire Color	Circuit No.	Function
A	PU	574	Low Reference
B	YE	573	CKP Sensor Signal

Engine Coolant Temperature (ECT) Sensor Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15326801 2-Way F GT 150 Series (BK)
Pin	Wire Color	Circuit No.	Function
A	YE	410	ECT Sensor Signal
B	BK	2761	Low Reference

Evaporative Emission (EVAP) Canister Purge Solenoid Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12052643 2-Way F Metri-Pack 150 Series Sealed (RD)
Pin	Wire Color	Circuit No.	Function
A	PK	239	Ignition 1 Voltage
B	D-GN/WH	428	EVAP Canister Purge Solenoid Control

Evaporative Emission (EVAP) Canister Vent Solenoid Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12052643 2-Way F Metri-Pack 150 Series Sealed (RD)
Pin	Wire Color	Circuit No.	Function
A	PK	239	Ignition 1 Voltage
B	WH	1310	EVAP Canister Vent Solenoid Control

Fuel Injector 1 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15326181 2-Way F MIC/P 064 Sealed (BK)
Pin	Wire Color	Circuit No.	Function
A	PK	439	Ignition 1 Voltage
B	BK	1744	Fuel Injector 1 Control

Fuel Injector 2 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15326181 2-Way F MIC/P 064 Sealed (BK)
Pin	Wire Color	Circuit No.	Function
A	PK	439	Ignition 1 Voltage
B	L-GN/BK	1745	Fuel Injector 2 Control

Fuel Injector 3 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15326181 2-Way F MIC/P 064 Sealed (BK)
Pin	Wire Color	Circuit No.	Function
A	PK	439	Ignition 1 Voltage
B	PK/BK	1746	Fuel Injector 3 Control

Fuel Injector 4 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15326181 2-Way F MIC/P 064 Sealed (BK)
Pin	Wire Color	Circuit No.	Function
A	PK	439	Ignition 1 Voltage
B	L-BU/BK	844	Fuel Injector 4 Control

Fuel Injector 5 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15326181 2-Way F MIC/P 064 Sealed (BK)
Pin	Wire Color	Circuit No.	Function
A	PK	439	Ignition 1 Voltage
B	BK/WH	845	Fuel Injector 5 Control

Fuel Injector 6 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15326181 2-Way F MIC/P 064 Sealed (BK)
Pin	Wire Color	Circuit No.	Function
A	PK	439	Ignition 1 Voltage
B	YE/BK	846	Fuel Injector 6 Control

Fuel Pump and Sender Assembly Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15354716 4-Way F GT 150 Sealed 3.2 X 4.0 (BK)
Pin	Wire Color	Circuit No.	Function
A	PU	1589	Fuel Level Sensor Signal - Primary
B	GY	120	Fuel Pump Supply Voltage
C	BK	2450	Ground
D	OG/BK	510	Low Reference

Fuel Tank Pressure (FTP) Sensor Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12059595 3-Way F Metri-Pack 150 Series Sealed (BK)
Pin	Wire Color	Circuit No.	Function
A	BK	2759	Low Reference
B	D-GN	890	Fuel Tank Pressure Sensor Signal
C	GY	2709	5-Volt Reference

Heated Oxygen Sensor (HO2S) 1 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12160482 4-Way F Metri-Pack 150 Series Sealed (GY)
Pin	Wire Color	Circuit No.	Function
A	TN	1664	HO2S Low Signal - Bank 1 Sensor 1
B	PU/WH	1665	HO2S High Signal - Bank 1 Sensor 1
C	-	-	Unavailable
D	PK	539	Ignition 1 Voltage
E	D-GN	676	HO2S Heater Low Control - Bank 1 Sensor 1

Heated Oxygen Sensor (HO2S) 2 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12160825 4-Way M Metri-Pack 150 Series (BK)
Pin	Wire Color	Circuit No.	Function
A	TN/WH	1669	HO2S Low Signal - Bank 1 Sensor 2
B	PU/WH	1668	HO2S High Signal - Bank 1 Sensor 2
C	BK/WH	1423	HO2S Heater Low Control - Bank 1 Sensor 2
D	PK	539	Ignition 1 Voltage

Ignition Coil 1 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15355370 3-Way F GT 150 Sealed 3.2 X 4.0 (BK)
Pin	Wire Color	Circuit No.	Function
A	PK	439	Ignition 1 Voltage
B	PU	2121	IC 1 Control
C	BK	550	Ground

Ignition Coil 2 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15355370 3-Way F GT 150 Sealed 3.2 X 4.0 (BK)
Pin	Wire Color	Circuit No.	Function
A	PK	439	Ignition 1 Voltage
B	RD/WH	2122	IC 2 Control
C	BK	550	Ground

Ignition Coil 3 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15355370 3-Way F GT 150 Sealed 3.2 X 4.0 (BK)
Pin	Wire Color	Circuit No.	Function
A	PK	439	Ignition 1 Voltage
B	L-BU	2123	IC 3 Control
C	BK	550	Ground

Ignition Coil 4 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15355370 3-Way F GT 150 Sealed 3.2 X 4.0 (BK)
Pin	Wire Color	Circuit No.	Function
A	PK	439	Ignition 1 Voltage
B	D-GN/WH	2124	IC 4 Control
C	BK	550	Ground

Ignition Coil 5 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15355370 3-Way F GT 150 Sealed 3.2 X 4.0 (BK)
Pin	Wire Color	Circuit No.	Function
A	PK	439	Ignition 1 Voltage
B	D-GN	2125	IC 5 Control
C	BK	550	Ground

Ignition Coil 6 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15355370 3-Way F GT 150 Sealed 3.2 X 4.0 (BK)
Pin	Wire Color	Circuit No.	Function
A	PK	439	Ignition 1 Voltage
B	L-BU/WH	2126	IC 6 Control
C	BK	550	Ground

Intake Air Temperature (IAT) Sensor Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15335987 2-Way F GT 150 Sealed 3.2 X 4.0 (BK)
Pin	Wire Color	Circuit No.	Function
A	TN	472	IAT Sensor Signal
B	BK	2760	Low Reference

Knock Sensor (KS) 1 Front Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15339014 2-Way F GT 150 SLD (WH)
Pin	Wire Color	Circuit No.	Function
A	D-BU	496	KS 1 Signal
B	GY	1716	Low Reference

Knock Sensor (KS) 2 Rear Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15339014 2-Way F GT 150 SLD (WH)
Pin	Wire Color	Circuit No.	Function
A	L-BU	1876	Knock Sensor 2 Signal
B	GY	2303	Low Reference

Manifold Absolute Pressure (MAP) Sensor Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12129946 3-Way F Metri-Pack 150 Series Sealed (GY)
Pin	Wire Color	Circuit No.	Function
A	OG/BK	469	Low Reference
B	L-GN	432	MAP Sensor Signal
C	GY	2704	5-Volt Reference

Secondary Air Injection (AIR) Pump (K18) Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12147067 2-Way F DUCON 6.3 Sealed (GY)
Pin	Wire Color	Circuit No.	Function
A	RD	78	Air Pump Supply Voltage
B	BK	2450	Ground

Secondary Air Injection (AIR) Pump Relay (K18) Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12129946 4-Way F 280 Series Metri-Pack Sealed (GY)
Pin	Wire Color	Circuit No.	Function
30	RD	1042	Battery Positive Voltage
85	BN	436	Air Pump Relay Control
86	PK	739	Ignition 1 Voltage
87	RD	78	Air Pump Supply Voltage

Secondary Air Injection (AIR) Solenoid (K18) Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15374222 2-Way F GT 150 SLD (WH)
Pin	Wire Color	Circuit No.	Function
A	PK/BK	415	Air Sol Fuse Supply Voltage
B	BK	350	Ground

Throttle Body Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15326835 8-Way F GT 150 Sealed 4.0 (BK)
Pin	Wire Color	Circuit No.	Function
A	D-GN	485	TP Sensor 1 Signal
B	L-BU/BK	1688	5-Volt Reference
C	BK	2752	Low Reference
D	PU	486	TP Sensor 2 Signal
E	YE	581	TAC Motor Control - 1
F	BN	582	TAC Motor Control - 2
G	GY	2701	5-Volt Reference
H	BK/WH	1704	Low Reference

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.