Engine Control Module (ECM) Connector End View C3

Fig 1: ECM C3 Connector End View

Courtesy of GENERAL MOTORS CORP.

ECM C3 Connector Part Information

Connector Part Information

Terminal Part Information

Pins: 7, 15, 18, 21, 23-24, 29, 32-33, 35, 37, 39, 46, 48-50, 53, 55, 57, 59, 64
Terminal/Tray: 33467-0003/23
Core/Insulation Crimp: H/H
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

ECM C3 Connector Terminal Identification

Pin	Wire Color	Circuit No.	Function
1-2	-	-	Not Used
3	TN/WH	3211	HO2S Low Reference (Bank 2 Sensor 1)
4	PU/WH	3210	HO2S Reference Voltage (Bank 2 Sensor 1)
5	PU	3220	HO2S High Signal (Bank 2 Sensor 2)
6	TN	3221	HO2S Low Signal (Bank 2 Sensor 2)
7	OG	225	Generator Turn On Signal
8-14	-	-	Not Used
15	L-GN	3212	HO2S Heater Low Signal (Bank 2 Sensor 1)
16-17	-	-	Not Used
18	BN	1174	Oil Level Switch Signal
19-20	-	-	Not Used
21	TN	5514	Low Reference
22	-	-	Not Used
23	OG/BK	469	Low Reference
24	OG/BK	1057	Low Reference
25-28	-	-	Not Used
29	GY	23	Generator Field Duty Cycle Signal
30-31	-	-	Not Used
32	OG	6392	Variable Tuning Signal
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 2
38	-	-	Not Used
39	GY	2704	5-Volt Reference 1
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	Low Speed Cooling Fan Relay Control
50	OG/WH	3223	HO2S 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	-	-	Not Used
57	OG/BK	380	A/C Refrigerant Pressure Sensor Signal
58	-	-	Not Used
59	L-GN	432	MAP Sensor Signal
60-63	-	-	Not Used
64	YE/BK	6806	IMT Fan Position Signal
65-73	-	-	Not Used