Engine Control Module (ECM) Connector End View C2

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		9123-7131 72-Way F (BK)
Pin	Wire Color	Circuit No.	Function
1	L-GN/RD	3113	HO2S Bank 2 Sensor 1 Heater Control
2	BK/WH	3212	HO2S Bank 1 Sensor 1 Heater Control
3	-	-	Not Used
4	L-GN	878	Fuel Injector 8 Control
5	BU	1744	Fuel Injector 1 Control
6	GN	1745	Fuel Injector 2 Control
7	PK/BK	877	Fuel Injector 7 Control
8	BN/YE	844	Fuel Injector 4 Control
9	PU	1746	Fuel Injector 3 Control
10	GY	845	Fuel Injector 5 Control
11-12	-	-	Not Used
13	YE	846	Fuel Injector 6 Control
14	L-BU/BK	574	Low Reference
15	RD/WH	632	Low Reference
16	BN	2129	Low Reference
17-19	-	-	Not Used
20	BK	469	MAP Sensor-Return
21	GN	470	Low Reference
22-23	-	-	Not Used
24	BN/WH	331	Engine Oil Pressure Signal
25	-	-	Not Used
26	BN	633	CMP Sensor
27-28	-	-	Not Used
29	PU	486	Throttle Position Sensor 2 Signal
30	-	-	Not Used
31	GN	485	Throttle Position Sensor 1 Signal
32-33	-	-	Not Used
35	PU/WH	2704	MAP Sensor 5-Volt Reference
36	BN/WH	1704	Low Reference
37	BU/YE	596	Reference Voltage 5-Volt Reference
38-40	-	-	Not Used
41	L-BU/BK	1688	5-Volt Reference
42	-	-	Not Used
43	L-BU/WH	2867	12-Volt Reference Voltage
44	WH/BK	631	Low Coolant Level Indicator Signal
45	GY	23	Generator Turn On Signal
46	L-GN	432	MAP Sensor Signal
47	-	-	Not Used
48	PU	1665	HO2S High Signal Bank 1 Sensor 1
49	BU/BK	1664	HO2S Low Signal Bank 1 Sensor 1
50	GN/YE	428	EVAP Canister Purge Solenoid Control
51	GY	1666	HO2S High Signal Bank 2 Sensor 1
52	GY/BK	2761	Low Reference
53	YE	2127	Ignition Coil 7 Control
54	WH	1310	EVAP Canister Vent Solenoid Control
55	YE	410	ECT Sensor Signal 5-Volt Reference
56	OG	225	Generator Field Duty Cycle Signal
57	L-GN	2126	Ignition Coil 6 Control
58	WH	2124	Ignition Coil 4 Control
59	GN	2125	Ignition Coil 5 Control
60	BN	582	TAC Motor Control-2
61	BU	2123	Ignition Coil 3 Control
62	BU	573	CKP Sensor Signal
63	YE	581	TAC Motor Control-1
64	PU	2130	Low Reference
65	L-BU	2128	Ignition Coil 8 Control
66	YE/BK	2122	Ignition Coil 2 Control
67	-	-	Not Used
68	BU	496	Knock Sensor 1 Signal
69	GY	2303	Knock Sensor 1 Return
70	GY/BK	1667	HO2S Low Signal Bank 2 Sensor 1
71	GY	1716	Knock Sensor 2 Return
72	L-BU	1876	Knock Sensor 2 Signal
73	BK/RD	450	Ground