Engine Control Module (ECM) C3

WARNING: This page is about a different car, the 2007 GMC Envoy, 2007 Chevrolet TrailBlazer, and 2007 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.

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

OEM: 15497996 (Early Production)/13574284 (Late Production)
Service: 88988372
Description: 73-Way F Receptacle 0.64 2.8 Series Sealed (GY)/32-Way F Sealed (GY)

Terminal Part Information

Pins: 3-6, 10-11, 15, 48, 50, 68-69
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: J/J
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Pins: 7, 12, 17, 21, 23, 28-29, 33, 35, 37, 39, 44, 47, 49, 53, 55, 57, 59, 64, 66
Terminal/Tray: 33467-0003/23
Core/Insulation Crimp: H/H
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Engine Control Module (ECM) C3 Connecter Terminal Identification

Pin	Wire Color	Circuit No.	Function
1-2	-	-	Not Used (Early Production)
1-2	-	-	Not Available (Late Production)
3	TN	1667	HO2S Low Signal - Bank 2 Sensor 1
4	PU	1666	HO2S High Signal - Bank 2 Sensor 1
5	PU	1670	HO2S High Signal - Bank 2 Sensor 2
6	TN	1671	HO2S Low Signal - Bank 2 Sensor 2
7	PU	5428	Generator Regulator Control
8-9	-	-	Not Used (Early Production)
8-9	-	-	Not Available (Late Production)
10	GY	5493	Cylinder Shutoff Solenoid Control (3)
11	D-BU	5491	Cylinder Shutoff Solenoid Control (1)
12	TN/BK	464	Delivered Torque Signal
13-14	-	-	Not Used (Early Production)
13-14	-	-	Not Available (Late Production)
15	L-GN	3212	HO2S Heater Low Control - Bank 2 Sensor 1
16	-	-	Not Used (Early Production)
16	-	-	Not Available (Late Production)
17	OG/BK	463	Requested Torque Signal
18-20	-	-	Not Used (Early Production)
18-20	-	-	Not Available (Late Production)
21	BK	2751	Low Reference
22	-	-	Not Used (Early Production)
22	-	-	Not Available (Late Production)
23	OG/BK	469	Low Reference
24-27	-	-	Not Used (Early Production)
24-27	-	-	Not Available (Late Production)
28	GY	2365	Low Reference
29	GY	23	Generator Field Duty Cycle Signal
30-32	-	-	Not Used (Early Production)
30-32	-	-	Not Available (Late Production)
33	TN	2501	High Speed GMLAN Serial Data Bus -
34	-	-	Not Used (Early Production)
34	-	-	Not Available (Late Production)
35	BK	2761	Low Reference
36	-	-	Not Used (Early Production)
36	-	-	Not Available (Late Production)
37	GY	2700	5-Volt Reference
38	-	-	Not Used (Early Production)
38	-	-	Not Available (Late Production)
39	GY	2704	5-Volt Reference
40-43	-	-	Not Used (Early Production)
40-43	-	-	Not Available (Late Production)
44	GY	597	5-Volt Reference
45-46	-	-	Not Used (Early Production)
45-46	-	-	Not Available (Late Production)
47	OG/BK	1786	PNP Switch Signal
48	D-GN/WH	428	EVAP Canister Purge Solenoid Control
49	WH/BK	2366	Cooling Fan Clutch Control
50	RD/WH	3223	HO2S Heater Low Control - Bank 2 Sensor 2
51-52	-	-	Not Used (Early Production)
51-52	-	-	Not Available (Late Production)
53	TN/WH	2500	High Speed GMLAN Serial Data Bus +
54	-	-	Not Used (Early Production)
54	-	-	Not Available (Late Production)
55	YE	410	ECT Sensor Signal
56	-	-	Not Used (Early Production)
56	-	-	Not Available (Late Production)
57	RD/BK	380	A/C Refrigerant Pressure Sensor
58	-	-	Not Used (Early Production)
58	-	-	Not Available (Late Production)
59	L-GN	432	MAP Sensor Signal
60-63	-	-	Not Used (Early Production)
60-63	-	-	Not Available (Late Production)
64	D-BU	2364	Cooling Fan Speed Signal
65	-	-	Not Used (Early Production)
65	-	-	Not Available (Late Production)
66	YE	400	Signal High - Front
67	-	-	Not Used (Early Production)
67	-	-	Not Available (Late Production)
68	L-GN	5492	Cylinder Shutoff Solenoid Control (4)
69	OG	5494	Cylinder Shutoff Solenoid Control(2)
70-72	-	-	Not Used (Early Production)
70-72	-	-	Not Available (Late Production)
73	-	-	Not Used