Engine Control Module (ECM) X2

Fig 1: Engine Control Module (ECM) X2 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 - Bank 1 Sensor 1 (LH8)
2	0.5 TN/WH	1653	HO2S Low Signal Sensor 1 (LLR)
3	0.5 PU/WH	1665	HO2S High Signal - Bank 1 Sensor 1 (LH8)
3	0.5 D-GN	1655	HO2S High Signal - Sensor 1 (LLR)
4	0.5 PU/WH	1668	HO2S High Signal - Bank 1 Sensor 2 (LH8)
4	0.5 PU/WH	1668	HO2S High Signal - Sensor 2 (LLR)
5	0.5 TN/WH	1669	HO2S Low Signal - Bank 1 Sensor 2 (LH8)
5	0.5 TN/WH	1669	HO2S Low Signal - Sensor 2 (LLR)
6	0.8 L-BU	1876	Knock Sensor 2 Signal (LH8)
7	0.8 GY	2303	Knock Sensor 2 Signal (LH8)
8	0.8 D-BU	496	Knock Sensor 1 Signal (LH8)
8	0.5 L-BU	1876	Knock Sensor Signal (LLR)
9	0.8 GY	1716	Knock Sensor 1 Signal (LH8)
9	0.5 GY	2303	Knock Sensor Signal (LLR)
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	739	Ignition Voltage
14	0.5 BN	2198	CMP Actuator Solenoid High Control (LLR)
15	-	-	Not Used
16	0.8 PK/BK	1746	Fuel Injector 3 Control (LH8)
17	0.5 PU/WH	2128	IC 8 Control (LH8)
17	0.5 L-BU	2123	IC 3 Control (LLR)
18	0.5 D-GN/WH	2124	IC 4 Control (LH8)
19	0.5 BN/WH	2130	Low Reference (LH8)
20-22	-	-	Not Used
23	0.5 OG	6260	Low Reference (LH8)
23	0.5 PK/BK	632	CMP Sensor Signal (LLR)
24	0.5 BK	2755	Low Reference
25-26	-	-	Not Used
27	0.5 GY/BK	6272	Low Reference (LH8)
27	0.5 D-BU/WH	1869	Low Reference (LLR)
28	-	-	Not Used
29	0.5 BK	2752	Low Reference
30-31	-	-	Not Used
32	0.8 L-GN/BK	1745	Fuel Injector 2 Control (LH8)
32	0.5 L-BU/BK	844	Fuel Injector 4 Control (LLR)
33	0.5 RD	2127	IC 7 Control (LH8)
33	0.5 D-GN	2125	IC 5 Control (LLR)
34	0.5 D-GN	2125	IC 5 Control (LH8)
35	0.5 BN	2129	Low Reference (LH8)
36-38	-	-	Not Used
39	0.5 D-BU	6259	5-Volt Reference 1 (LH8)
39	0.5 RD	631	5-Volt Reference 2 (LLR)
40	0.5 GY	2705	5-Volt Reference 1
41	-	-	Not Used
42	0.5 BK	2760	Low Reference
43	0.5 PU/WH	6270	5-Volt Reference 2 (LH8)
43	0.5 L-GN	1867	5-Volt Reference 2 (LLR)
44	0.5 GY	2701	5-Volt Reference 2
45	-	-	Not Used
46	0.5 BK	2199	Low Reference (LLR)
47	-	-	Not Used
48	0.8 D-BU/WH	878	Fuel Injector 8 Control (LH8)
48	0.5 PK/BK	1746	Fuel Injector 3 Control (LLR)
49	0.8 BK/WH	845	Fuel Injector 5 Control (LH8)
50-51	-	-	Not Used
52	0.8 YE/BK	846	Fuel Injector 6 Control (LH8)
52	0.5 L-GN/BK	1745	Fuel Injector 2 Control (LLR)
53	0.5 RD/WH	2122	IC 2 Control (LH8)
53	0.5 D-GN/WH	2124	IC 4 Control (LLR)
54	0.5 L-BU/WH	2126	IC 6 Control (LH8)
54	0.5 RD/WH	2122	IC 2 Control (LLR)
55	0.5 L-BU	2123	IC 3 Control (LH8)
56-58	-	-	Not Used
59	0.5 D-BU/WH	6265	CMP Sensor Signal (LH8)
59	0.5 BK	630	Low Reference (LLR)
60	0.5 TN/WH	331	Oil Pressure Sensor Signal (LH8)
61	-	-	Not Used
62	0.5 L-BU	6289	IAT Sensor Signal
63	0.5 WH/BK	6271	CKP Sensor Signal (LH8)
63	0.5 YE/BK	1868	CKP Sensor Signal (LLR)
64	0.5 D-GN	485	TP Sensor 1 Signal
65	-	-	Not Used
66	0.5 PU	486	TP Sensor 2 Signal
67	0.5 YE	492	MAF Sensor Signal
68	0.5 BK/WH	3113	HO2S Heater Low Control - Bank 1 Sensor 1 (LH8)
68	0.5 D-GN	676	HO2S Heater High Control - Sensor 1 (LLR)
69	0.5 BK/WH	3122	HO2S Heater Low Control - Bank 1 Sensor 2 (LH8)
69	0.5 BK/WH	1423	HO2S Heater Low Control - Sensor 2 (LLR)
70	0.8 L-BU/BK	844	Fuel Injector 4 Control (LH8)
71	0.8 RD/BK	877	Fuel Injector 7 Control (LH8)
71	0.5 BK/WH	845	Fuel Injector 5 Control (LLR)
72	0.8 BK	1744	Fuel Injector 1 Control
73	2 BK	451	Ground

Connector Part Information

OEM: 34566-7703
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, 72
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: J/J
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Pins: 73
Terminal/Tray: 7116-4152-02/9
Core/Insulation Crimp: 2/5
Release Tool/Test Probe: 12094430/J-35616-35 (VT)