Engine Control Module (ECM) X2

WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

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

Courtesy of GENERAL MOTORS COMPANY

Pin	Wire	Circuit	Function
1	0.5 PU/BK	2121	IC 1 Control
2	0.35 TN/OG	3111	HO2S Low Reference Bank 2 Sensor 1
3	0.35 GN	3110	HO2S Reference Voltage Bank 2 Sensor 1
4	0.5 PK/OG	3120	HO2S 2 High Signal
5	0.5 BN/PK	3121	HO2S 2 Low Signal
6	0.5 PK/YE	1876	Knock Sensor 2 Signal
7	0.5 GY	2303	Knock Sensor 2 Signal
8	0.5 BU	496	Knock Sensor 1 Signal
9	0.5 WH/GY	1716	Knock Sensor 1 Signal
10	-	-	Not Used
11	0.8 YE	581	TAC Motor Control - 1
12	0.8 OG	582	TAC Motor Control - 2
13	0.75 PK	5290	Ignition 1 Voltage
14-15	-	-	Not Used
16	0.5 RD/BK	878	Fuel Injector 8 Control
17	0.5 OG/WH	2122	IC 2 Control
18	0.5 L-BU/WH	2126	IC 6 Control
19	0.5 TN/WH	2130	Low Reference
20-22	-	-	Not Used
23	0.5 TN	6266	Low Reference
24	-	-	Not Used
25	0.5 BN/GN	2753	Low Reference
26	-	-	Not Used
27	0.5 GY/BK	6272	Low Reference
28	-	-	Not Used
29	0.5 RD/YE	2752	Low Reference
30	-	-	Not Used
31	0.5 GY	435	EGR Solenoid Low Control
32	0.5 PK	1746	Fuel Injector 3 Control
33	0.5 OG	2127	IC 7 Control
34	0.5 GN	2125	IC 5 Control
35	0.5 TN	2129	Low Reference
36-38	-	-	Not Used
39	0.5 PK/WH	6259	5-Volt Reference 2
40	-	-	Not Used
41	0.5 PK/BN	2702	5-Volt Reference 1
42	0.5 BN/D-BU	2760	Low Reference
43	0.5 RD/GY	6270	CKP Sensor 5-Volt Reference
44	0.5 PK/RD	2701	5-Volt Reference 2
45-47	-	-	Not Used
48	0.5 L-GN/BK	1745	Fuel Injector 2 Control
49	0.5 BN/WH	845	Fuel Injector 5 Control
50	-	-	Not Used
51	0.5 RD/L-BU	1676	EGR Solenoid High Control
52	0.5 L-BU/BK	844	Fuel Injector 4 Control
53	0.5 L-BU	2123	IC 3 Control
54	0.5 GN/WH	2124	IC 4 Control
55	0.5 PU/WH	2128	IC 8 Control
56-58	-	-	Not Used
59	0.5 BU/WH	6265	CMP Sensor Signal
60	-	-	Not Used
61	0.5 L-GN/RD	1456	EGR Valve Position Signal
62	0.5 BN	472	IAT Sensor Signal
63	0.5 WH/BK	6271	CKP Sensor Signal
64	0.5 GN	485	TP Sensor 1 Signal
65	-	-	Not Used
66	0.5 PU	486	TP Sensor 2 Signal
67	0.5 BN/YE	492	MAF Sensor Signal
68	0.35 WH	3113	HO2S Heater Low Control Bank 2 Sensor 1
69	0.8 GY/WH	3122	HO2S 2 Heater Low Control
70	0.5 YE/BK	846	Fuel Injector 6 Control
71	0.5 OG/BK	877	Fuel Injector 7 Control
72	0.5 BN/BK	1744	Fuel Injector 1 Control
73	2 BK/WH	1551	Ground

Connector Part Information

Harness Type: Engine
OEM Connector: 34566-2903
Service Connector: 88988931
Description: 73-Way F MX123 34566 Series (GY)

Terminal Part Information

Pins: 1-72
Terminated Lead: 13575575
Release Tool: J-38125-213
Diagnostic Test Probe: J-35616-64B (L-BU)
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: J/J

Pin: 73
Terminated Lead: 13576392
Release Tool: J-38125-11A
Diagnostic Test Probe: J-35616-35 (VT)
Terminal/Tray: 7116-4152-02/9
Core/Insulation Crimp: 2/5