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