Engine Control Module (ECM) Connector End View C2

Engine Control Module (ECM) C2

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		34566-2503 73-Way F Micro-Pack 64 Series Sealed (BK)
Pin	Wire Color	Circuit No.	Function
1	PU	2121	IC 1 Control
2	TN/WH	3111	HO2S Low Signal (Sensor 1)
3	PU/WH	3110	HO2S High Signal (Sensor 1)
4	PU/WH	1668	HO2S High Signal (Sensor 2)
5	TN/WH	1669	HO2S Low Signal (Sensor 2)
6-7	-	-	Not Used
8	D-BU	496	Knock Sensor Signal
9	GY	1716	Low Reference
10	-	-	Not Used
11	YE	581	TAC Motor Control 1
12	BN	582	TAC Motor Control 2
13	PK/BK	5290	Ignition 1 Voltage
14	PK/BK	6395	CMP Actuator Solenoid Control Intake
15-16	-	-	Not Used
17	L-BU	2123	IC 3 Control
18-19	-	-	Not Used
20	GY	5296	Low Reference
21-22	-	-	Not Used
23	TN	5301	Low Reference
24-26	-	-	Not Used
27	PU	574	Low Reference
28	-	-	Not Used
29	BK	2752	Low Reference
30	L-GN	5282	Low Reference
31	-	-	Not Used
32	L-GN	1745	Fuel Injector 2 Control
33	D-GN/WH	2124	IC 4 Control
34	-	-	Not Used
35	BN	2129	Low Reference
36	YE/BK	5297	5-Volt Reference
37-38	-	-	Not Used
39	D-BU	5300	5-Volt Reference
40-41	-	-	Not Used
42	BK	2760	Low Reference
43	L-GN	2867	5-Volt Reference
44	GY	2701	5-Volt Reference B
45	-	-	Not Used
46	PU	5284	Low Reference
47	-	-	Not Used
48	PK/BK	1746	Fuel Injector 3 Control
49	-	-	Not Used
50	WH/BK	6396	CMP Actuator Solenoid Control Exhaust
51-52	-	-	Not Used
53	RD/WH	2122	IC 2 Control
54-55	-	-	Not Used
56	D-GN	5273	CMP Sensor Signal
57-58	-	-	Not Used
59	OG	5275	CMP Sensor Signal
60-61	-	-	Not Used
62	TN	472	IAT Sensor Signal
63	YE	573	CKP Sensor Signal
64	D-GN	485	TP Sensor 1 Signal
65	-	-	Not Used
66	PU	486	TP Sensor 2 Signal
67	YE	492	MAF Sensor Signal
68	BK/WH	3113	HO2S Heater Low Control (Sensor 1)
69	BK/WH	3122	HO2S Heater Low Control (Sensor 2)
70	-	-	Not Used
71	L-BU/BK	844	Fuel Injector 4 Control
72	BK	1744	Fuel Injector 1 Control
73	BK/WH	451	Ground