Engine Control Module (ECM) Connector End View - C3

Fig 1: Engine Control Module (ECM) - C3 Connector End View

Courtesy of GENERAL MOTORS CORP.

Engine Control Module (ECM) - C3 Connector Parts Information

Connector Part Information

Terminal Part Information

Engine Control Module (ECM) - C3 Connector Terminal Identification

Pin	Wire Color	Circuit No.	Function
1-2	-	-	Not Used
3	TN/WH	3211	H02S Low Reference Bank 2 Sensor 1
4	PU/WH	3210	HO2S Reference Voltage Bank 2 Sensor 1
5	PU	3220	H02S High Signal Bank 2 Sensor 2
6	TN	3221	H02S Low Signal Bank 2 Sensor 2
7	OG	225	Generator Turn On Signal
8-13	-	-	Not Used
14	L-BU	7126	Super Charger Vacuum Bypass Valve Control
15	L-GN	3212	H02S Heater Low Control Bank 2 Sensor 1
16	PK	2014	Coolant Pump Relay Control
17	-	-	Not Used
18	BN	1174	Oil Level Switch Signal
19-20	-	-	Not Used
21	BK/WH	2751	Low Reference
22	OG/BK	6014	Low Reference
23	OG/BK	469	Low Reference
24-28	-	-	Not Used
29	GY	23	Generator Field Duty Cycle Signal
30-32	-	-	Not Used
33	TN	2501	High Speed GMLAN Serial Data BUS -
34	YE/BK	6120	Low Reference
35	TN	2761	Low Reference
36	-	-	Not Used
37	GY	2700	5-Volt Reference - 1
38	WH/BK	2932	5-Volt Reference - 2
39	GY	2704	5-Volt Reference - 2
40-45	-	-	Not Used
46	OG/BK	1786	Park/Neutral Signal
47	-	-	Not Used
48	D-GN/WH	428	EVAP Canister Purge Solenoid Control
49	D-GN	335	Cooling Fan Speed Control
50	OG/BK	3223	H02S Heater Low Control Bank 2 Sensor 2
51-52	-	-	Not Used
53	TN/BK	2500	High Speed GMLAN Serial Data Bus +
54	-	-	Not Used
55	YE	410	ECT Sensor Signal
56	L-BU	6118	IAT 2 Signal
57	OG/BK	380	A/C Refrigerant Pressure Sensor Signal
58	GY/BK	433	BARO Sensor Signal
59	L-GN	432	MAP Sensor Signal
60-72	-	-	Not Used
73	BK/WH	451	Ground