Engine Control Module (ECM) X3 (LY7)

Fig 1: Engine Control Module (ECM) X3 (LY7)

Courtesy of GENERAL MOTORS CORP.

Engine Control Module (ECM) X3 (LY7)

Pin	Wire	Circuit	Function
1-2	-	-	Not Used
3	0.5 TN/WH	3211	HO2S Low Reference Bank 2 Sensor 1
4	0.5 PU/WH	3210	HO2S Reference Voltage Bank 2 Sensor 1
5	0.5 PU	3220	HO2S High Signal Bank 2 Sensor 2
6	0.5 TN	3221	HO2S Low Signal Bank 2 Sensor 2
7	0.5 OG	225	Generator Turn On Signal
8-14	-	-	Not Used
15	0.5 L-GN	3212	HO2S Heater Low Control - Bank 2 Sensor 1
16-20	-	-	Not Used
21	0.5 TN	5514	Low Reference
22	-	-	Not Used
23	0.5 OG/BK	469	Low Reference
24-28	-	-	Not Used
29	0.5 GY	23	Generator Field Duty Cycle Signal
30-32	-	-	Not Used
33	0.5 TN	2501	High Speed GMLAN Serial Data Bus-
34	-	-	Not Used
35	0.5 TN	2761	Low Reference
36	-	-	Not Used
37	0.5 GY	2700	5-Volt Reference 2
38	-	-	Not Used
39	0.5 GY	2704	5-Volt Reference
40-45	-	-	Not Used
46	0.5 OG/BK	1786	Ignition Lock Cylinder Control Actuator Signal
47	-	-	Not Used
48	0.5 D-GN/WH	428	EVAP Canister Purge Solenoid Control
49	0.5 D-GN	335	Low Speed Cooling Fan Relay Control
50	0.5 OG/WH	3223	HO2S Heater Low Control Bank 2 Sensor 2
51-52	-	-	Not Used
53	0.5 TN/BK	2500	High Speed GMLAN Serial Data Bus+
54	-	-	Not Used
55	0.5 YE	410	ECT Sensor Signal
56	-	-	Not Used
57	0.5 OG/BK	380	A/C Refrigerant Pressure Sensor Signal
58	-	-	Not Used
59	0.5 L-GN	432	MAP Sensor Signal
60-64	-	-	Not Used
65	0.5 TN/BK	231	Oil Pressure Switch Signal
66-73	-	-	Not Used

Connector Part Information  OEM: 15497996 Service: 88988372 Description: 73-Way F 0.64 2.8 Series, Sealed (BK)

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