Engine Control Module (ECM) X3 (LY7) Connector

Fig 1: Engine Control Module (ECM) X3 (LY7) Connector End View

Courtesy of GENERAL MOTORS CORP.

Engine Control Module (ECM) X3 (LY7) Connector Parts Information

Connector Part Information

Terminal Part Information

Engine Control Module (ECM) X3 (LY7) Connector Terminal Identification

Pin	Wire	Circuit No.	Function
1-2	-	-	Not Used
3	0.5 TN/BK	7354	Oxygen Sensor Heated B Low Reference
4	0.5 PU/WH	7355	Oxygen Sensor Heated B High Reference
5	0.5 YE/BN	7359	Oxygen Sensor Heated D High Reference
6	0.5 VT/WH	7358	Oxygen Sensor Heated D Low Reference
7	0.5 OG	225	Generator Turn On Signal
8-14	-	-	Not Used
15	0.5 GY	6425	Oxygen Sensor Heated B Signal
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
30-31	-	-	Not Used
32	0.5 OG	6392	Variable Tuning Control
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
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 PU	6427	Right Front Door Ajar Switch Signal
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
60-63	-	-	Not Used
64	0.5 YE	7017	Variable Intake Manifold Position Signal
65	0.5 TN/BK	231	Oil Pressure Switch Signal
66-73	-	-	Not Used