Powertrain Control Module (PCM) C2 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15430226 73-Way F Micro-Pack 64 Series Sealed (BK)
Pin	Wire Color	Circuit No.	Function
1	BN	1456	EGR Valve Position Signal
2	OG/BK	1061	UART Serial Data (Secondary)
3	TN	800	UART Serial Data (Primary)
4	PK/BK	1746	Fuel Injector 3 Control
5	TN	1744	Fuel Injector 1 Control
6	L-GN/BK	1745	Fuel Injector 2 Control
7	TN/WH	845	Fuel Injector 5 Control
8	TN	2753	Low Reference
9	YE/BK	846	Fuel Injector 6 Control
10	L-BU/BK	844	Fuel Injector 4 Control
11	OG/WH	2122	IC 2 Control
12	GY/WH	3113	HO2S Heater Low Control (Bank 1 Sensor 1)
13	OG	1676	EGR Solenoid High Control
14	-	-	Not Used
15	PU	574	Low Reference
16	GY	435	EGR Solenoid Low Control
17	-	-	Not Used
18	L-GN	432	MAP Sensor Signal
19-20	-	-	Not Used
21	OG	631	12-Volt Reference
22	L-GN	1867	12-Volt Reference
23-24	-	-	Not Used
25	TN/WH	3211	HO2S Low Reference (Bank 2 Sensor 1)
26	BN/WH	633	CMP Sensor Signal
27	L-BU/BK	647	Medium Resolution Engine Speed Signal
28-29	-	-	Not Used
30	OG/BK	469	Low Reference
31	-	-	Not Used
32	PK/BK	632	Low Reference
33	GY	5047	5-Volt Reference
34	GY	2704	5-Volt Reference A
35	-	-	Not Used
36	GY	2303	Low Reference
37	YE	2174	Low Reference
38	D-BU	496	Knock Sensor 1 Signal
39	GY/BK	1798	Drain Wire
40	GY	1716	Low Reference
41	D-GN/WH	428	EVAP Canister Purge Solenoid Control
42-46	-	-	Not Used
47	TN/WH	3111	HO2S Low Reference (Bank 1 Sensor 1)
48	PU/WH	3110	HO2S Reference Voltage (Bank 1 Sensor 1)
49-52	-	-	Not Used
53	OG	225	Generator Turn On Signal
54	L-BU	1876	Knock Sensor 2 Signal
55	YE	410	ECT Sensor Signal
56	OG/BK	645	Drain Wire
57	TN/BK	231	Oil Pressure Switch Signal
58-59	-	-	Not Used
60	PU/WH	3210	HO2S Reference Voltage (Bank 2 Sensor 1)
61	PU	2121	IC 1 Control
62	L-GN	3212	HO2S Heater Low Control (Bank 2 Sensor 1)
63	L-BU	2123	IC 3 Control
64-72	-	-	Not Used
73	BK/WH	451	Ground

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15430225 73-Way F Micro 64 Series Sealed (BK)
Pin	Wire Color	Circuit No.	Function
1	OG	225	Generator Turn On Signal
2	D-GN	485	TP Sensor 1 Signal
3-5	-	-	Not Used
6	GY	2701	5-Volt Reference
7	PU	486	TP Sensor 2 Signal
8	GY	2704	5-Volt Reference
9	L-BU/BK	1688	5-Volt Reference
10-16	-	-	Not Used
17	YE	573	Crankshaft Position Sensor Signal (1)
18	PU	574	Crankshaft Position Sensor Low Reference (1)
19	-	-	Not Used
20	OG/BK	469	CKP Sensor B Signal
21-24	-	-	Not Used
25	TN/WH	3121	HO2S Low Signal Bank 1 Sensor 2
26	BN/WH	633	Camshaft Position Signal
27-31	-	-	Not Used
32	TN/WH	3111	HO2S Low Reference Bank 1 Sensor 1
33	TN	1744	Fuel Injector 1 Control
34	-	-	Not Used
35	YE	410	ECT Sensor Signal
36	TN/WH	1704	Low Reference
37	L-GN	432	MAP Sensor Signal
38	-	-	Not Used
39	TN	2752	Low Reference
40	WH	423	IC Timing Control
41	YE	492	MAF Sensor Signal
42	-	-	Not Used
43	GY/WH	3122	HO2S Heater Low Control Sensor 1
44	-	-	Not Used
45	GY	23	Generator Field Duty Cycle Signal
46	PU	3120	HO2S High Signal Sensor 2
47	-	-	Not Used
48	PU/WH	3110	HO2S Reference Voltage Sensor 1
49-50	-	-	Not Used
51	TN	472	IAT Sensor Signal
52	TN	2761	Low Reference
53	PK/BK	1746	Fuel Injector 3 Control
54	L-GN/BK	1745	Fuel Injector 2 Control
55	L-BU/BK	844	Fuel Injector 4 Control
56-57	-	-	Not Used
58	GY/WH	3113	HO2S Heater Low Control Sensor 1
59	OG	406	IC Timing Control B
60-63	-	-	Not Used
64	TN/BK	2760	Low Reference
65	BN	582	TAC Motor Control 2
66	YE	581	TAC Motor Control 1
67	-	-	Not Used
68	D-BU	496	Knock Sensor Signal
69	GY	1716	Low Reference
70-72	-	-	Not Used
73	BK/WH	451	Ground