Engine Control Module (ECM) X3 (LY7)

WARNING: This page is about a different car, the 2008 Saturn Outlook, 2008 GMC Acadia, and 2008 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

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

Courtesy of GENERAL MOTORS CORP.

Pin	Wire	Circuit	Function
1-2	-	-	Not Used
3	0.5 TN/BK	7354	Low Reference
4	0.5 PU/WH	7355	Oxygen Sensor Heated B High Reference
5	0.5 YE/BN	7359	Oxygen Sensor Bank 2 Sensor 2 Signal
6	0.5 VT/WH	7358	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 2
38	-	-	Not Used
39	0.5 GY	2704	5-Volt Reference 1
40-45	-	-	Not Used
46	0.5 OG/BK	1786	Park/Neutral 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	Oxygen Sensor Heated D 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

Connector Part Information

OEM: 34566-5303
Service: See Catalog
Description: 73-Way F MX123 34566 Series, Sealed (GY)

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)