Engine Control Module (ECM) C3

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. 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 & Terminal Parts Information

Connector Part Information

OEM: 15492321
Service: 88988361
Description: 73-Way F GT 280 Series Micro 64 Sealed (GY)

Terminal Part Information

Pins: 7, 21, 23, 29, 33, 35, 37, 39, 47, 48, 49, 53, 55, 57, 59, 65
Terminal/Tray: 33467-0003/23
Core/Insulation Crimp: H/H
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Pins: 28, 44
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: J/J
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Engine Control Module (ECM) C3 Terminal Identification

Pin	Wire Color	Circuit No.	Function
1-6	-	-	Not Used
7	OG	225	Generator Turn On Signal
8-20	-	-	Not Used
21	BK/WH	2751	Low Reference
22	-	-	Not Used
23	OG/BK	469	Low Reference
24-27	-	-	Not Used
28	TN/WH	1704	Low Reference
29	GY/WH	23	Generator Field Duty Cycle Signal
30-32	-	-	Not Used
33	TN	2501	High Speed GMLAN Serial Data (-)
34	-	-	Not Used
35	TN	2761	Low Reference
36	-	-	Not Used
37	GY	2700	5-Volt Reference - 1
38	-	-	Not Used
39	GY	2704	5-Volt Reference - 1
40-43	-	-	Not Used
44	L-BU/BK	1688	5-Volt Reference - 2
45-46	-	-	Not Used
47	D-GN	1433	PNP/Clutch Start Switch Signal (M86)
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 (+)
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 Switch Signal
66-73	-	-	Not Used