Powertrain Control Module (PCM) C2 (NU3) Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15460475 73-Way F Micro-Pack/064 Series (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	BK/WH	845	Fuel Injector 5 Control
5	BK	1744	Fuel Injector 1 Control
6	YE/BK	846	Fuel Injector 6 Control
7	PK/BK	1746	Fuel Injector 3 Control
8	BK	2753	Low Reference
9	L-GN/BK	1745	Fuel Injector 2 Control
10	L-BU/BK	844	Fuel Injector 4 Control
11	TN/BK	424	IC Timing Signal
12	BK/WH	3112	HO2S Heater Low Control Sensor 1
13	RD	1676	EGR Solenoid High Control
14-15	-	-	Not Used
16	GY	435	EGR Solenoid Low Control
17	-	-	Not Used
18	L-GN	432	MAP Sensor Signal
19-25	-	-	Not Used
26	BK	630	Camshaft Position Signal
27	PU/WH	430	Low Resolution Engine Speed Signal
28	L-BU/BK	647	Medium Resolution Engine Speed Signal
29	BK	2761	Low Reference
30	OG/BK	469	Low Reference
31	BN	1174	Oil Level Switch Signal
32	-	-	Not Used
33	GY	2702	5-Volt Reference
34	GY	2704	5-Volt Reference
35	GY	474	5-Volt Reference
36	-	-	Not Used
37	RD/BK	453	Low Reference
38-40	-	-	Not Used
41	D-GN/WH	428	EVAP Canister Purge Solenoid Control
42-44	-	-	Not Used
45	GY	23	Generator Field Duty Cycle Signal
46	D-BU	496	Knock Sensor 1 Signal
47	TN/WH	3111	HO2S Low Signal
48	PU/WH	3110	HO2S High Signal
49-52	-	-	Not Used
53	RD	225	Generator Turn On Signal
54	-	-	Not Used
55	YE	410	ECT Sensor Signal
56	-	-	Not Used
57	TN/BK	231	Oil Pressure Switch Signal
58	L-BU	1876	Knock Sensor 2 Signal
59	PK/BK	429	AIR Solenoid Control
60	-	-	Not Used
61	WH	423	IC Timing Control
62-72	-	-	Not Used
73	BK/WH	451	Ground