Engine Control Module (ECM) C3

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

Courtesy of GENERAL MOTORS CORP.

Engine Control Module (ECM) C3 Connector End View

Connector Part Information

Pin	Wire Color	Circuit No.	Function
1-6	-	-	Not Used
7	OG	225	Generator Turn On Signal
8-20	-	-	Not Used
21	TN	5514	Low Reference
22	-	-	Not Used
23	OG/BK	469	Low Reference
24	OG/BK	1057	Low Reference
25-27	-	-	Not Used
28	TN/WH	1704	Low Reference
29	GY	23	Generator Field Duty Cycle Signal
30-32	-	-	Not Used
33	TN	2501	High Speed GMLAN Serial Data Bus -
34	-	-	Not Used
35	TN	2761	Low Reference
36	-	-	Not Used
37	GY	2700	5-Volt Reference B
38	-	-	Not Used
39	GY	2704	5-Volt Reference A
40-43	-	-	Not Used
44	L-BU/BK	1688	5-Volt Reference B
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	Low Speed Cooling Fan Relay Control
50-52	-	-	Not Used
53	TN/BK	2500	High Speed GMLAN Serial Data Bus +
54	-	-	Not Used
55	YE	410	ECT Sensor Signal
56	-	-	Not Used
57	OG/BK	380	A/C Refrigerant Pressure Sensor Signal
58	-	-	Not Used
59	L-GN	432	MAP Sensor Signal
60-64	-	-	Not Used
65	TN/BK	231	Oil Pressure Sensor Signal
66	BN/WH	6354	Transmission Output Speed Sensor High Signal
67-73	-	-	Not Used