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  OEM: 13542577 Service: See Catalog Description: 73-Way F (BK)

Terminal Part Information  Pins: 7, 15, 21, 24, 29, 32, 33, 37, 46, 49, 50, 53, 57, 64, 65 Terminal/Tray: 33467-0003/23 Core/Insulation Crimp: H/H Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU) Pins: 3, 4, 5, 6, 23, 35, 39, 48, 55, 59 Terminal/Tray: 33467-0005/23 Core/Insulation Crimp: Pins 3, 4, 5, 6 - K/K Core/Insulation Crimp: Pins 23, 35, 39, 48, 55, 59 - J/J Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

ECM C3 Connector End View

Pin	Wire Color	Circuit No.	Function
1-2	-	-	Not Used
3	TN\WH	3211	Low Reference
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 Control (- Bank 2 Sensor 1)
16-20	-	-	Not Used
21	TN	5514	Low Reference
22	-	-	Not Used
23	OG\BK	469	Low Reference
24	TN\WH	2759	Low Reference
25-28	-	-	Not Used
29	GY	23	Generator Field Duty Cycle Signal
30-31	-	-	Not Used
32	OG	6392	IMT Valve Control
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 3
38	-	-	Not Used
39	GY	2704	5-Volt Reference 1
40-45	-	-	Not Used
46	OG\BK	1786	Ignition Lock Cylinder Control Actuator 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 Valve Signal
65	TN\BK	231	5-Volt Reference 1
66-73	-	-	Not Used