Engine Control Module (ECM) X2 (LS4)

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Engine Control Module (ECM) X2 (LS4) Connector End View

Courtesy of GENERAL MOTORS CORP.

Pin	Wire	Circuit	Function
1	0.5 PU	2121	IC 1 Control
2	0.5 TN	1664	HO2S Low Signal
3	0.5 PU/WH	1665	HO2S High Signal
4	0.5 PU/WH	1668	HO2S High Signal
5	0.5 TN/WH	1669	HO2S Low Signal
6	0.35 L-BU	1876	Knock Sensor 2 Signal
7	0.35 GY	2303	Knock Sensor 2 Signal
8	0.35 D-BU	496	Knock Sensor 1 Signal
9	0.35 GY	1716	Knock Sensor 1 Signal
10	-	-	Not Used
11	0.5 YE	581	TAC Motor Control 1
12	0.5 BN	582	TAC Motor Control 2
13	0.5 PK/BK	5290	Ignition 1 Voltage
14-15	-	-	Not Used
16	0.5 PK/BK	1746	Fuel Injector 3 Control
17	0.5 PU/WH	2128	IC 8 Control
18	0.5 D-GN/WH	2124	IC 4 Control
19	0.5 BN/WH	2130	Low Reference
20-22	-	-	Not Used
23	0.35 PK/BK	632	Low Reference
24	0.35 BK	2755	Low Reference
25-26	-	-	Not Used
27	0.35 YE/BK	1868	Low Reference
28	-	-	Not Used
29	0.35 BK/WH	1704	Low Reference
30-31	-	-	Not Used
32	0.5 L-GN/BK	1745	Fuel Injector 2 Control
33	0.5 RD	2127	IC 7 Control
34	0.5 D-GN	2125	IC 5 Control
35	0.5 BN	2129	Low Reference
36-38	-	-	Not Used
39	0.35 RD	631	5-Volt Reference 1
40	0.35 GY	2705	5-Volt Reference 1
41	-	-	Not Used
42	0.35 BK	2760	Low Reference
43	0.35 L-GN	1867	5-Volt Reference 2
44	0.35 L-BU/BK	1688	5-Volt Reference 2
45-47	-	-	Not Used
48	0.5 D-BU/WH	878	Fuel Injector 8 Control
49	0.5 BK/WH	845	Fuel Injector 5 Control
50-51	-	-	Not Used
52	0.5 YE/BK	846	Fuel Injector 6 Control
53	0.5 RD/WH	2122	IC 2 Control
54	0.5 L-BU/WH	2126	IC 6 Control
55	0.5 L-BU	2123	IC 3 Control
56-58	-	-	Not Used
59	0.35 BN/WH	633	CMP Sensor Signal
60	0.35 TN/WH	331	Oil Pressure Switch Signal
61	-	-	Not Used
62	0.35 TN	472	IAT Sensor Signal
63	0.35 D-BU/WH	1869	CKP Sensor Signal
64	0.35 D-GN	485	TP Sensor 1 Signal
65	-	-	Not Used
66	0.35 PU	486	TP Sensor 2 Signal
67	0.35 YE	492	MAF Sensor Signal
68	0.5 BK/WH	3113	HO2S Heater Low Control Sensor
69	0.5 BN	2391	HO2S Heater Low Control - Sensor 2
70	0.5 L-BU/BK	844	Fuel Injector 4 Control
71	0.5 RD/BK	877	Fuel Injector 7 Control
72	0.5 BK	1744	Fuel Injector 1 Control
73	2 BK/WH	451	Ground

Connector Part Information

OEM: 13574286
Service: See Catalog
Description: 73-Way F MX123 34566 Series (BK)

Terminal Part Information

Pins: 1-9, 11-13, 16-19, 23, 24, 27, 29, 32-35, 39, 40, 42-44, 48, 49, 52-55, 59, 60, 62-64, 66-73
Terminal/Tray: See Terminal Repair Kit
Core/Insulation Crimp: See Terminal Repair Kit
Release Tool/Test Probe: See Terminal Repair Kit