Engine Control Module (ECM) X2 (LC3)

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

Fig 1: Engine Control Module (ECM) X2 (LC3) Connector End View

Courtesy of GENERAL MOTORS CORP.

Pin	Wire	Circuit	Function
1	0.8 PU	2121	IC 1 Control
2	0.5 TN/WH	3111	HO2S Low Signal (Bank 1 Sensor 1)
3	0.5 PU/WH	3110	HO2S High Signal (Bank 1 Sensor 1)
4	0.5 PU	3120	HO2S High Signal (Bank 1 Sensor 2)
5	0.5 TN/WH	3121	HO2S Low Signal (Bank 1 Sensor 2)
6	0.5 L-BU	1876	Knock Sensor 2 Signal
7	0.5 GY	2303	Knock Sensor 2 Signal
8	0.35 D-BU	496	Knock Sensor 1 Signal
9	0.5 GY	1716	Knock Sensor 1 Signal
10	-	-	Not Used
11	0.75 YE	581	TAC Motor Control - 1
12	0.75 BN	582	TAC Motor Control - 2
13	0.75 PK/BK	5290	Ignition 1 Voltage
14	0.35 PK/BK	6395	Camshaft Position (CMP) Actuator Solenoid - Intake Bank 1 Control
15	0.35 TN/BK	6397	Camshaft Position (CMP) Actuator Solenoid - Intake Bank 2 Control
16	0.35 D-BU/WH	878	Fuel Injector 8 Control
17	0.8 OG/WH	2122	IC 2 Control
18	0.5 L-BU/WH	2126	IC 6 Control
19	0.8 BN/WH	2130	Low Reference
20	0.5 PU	6267	Low Reference
21	0.5 TN	6268	Low Reference
22	0.5 WH	6269	Low Reference
23	0.5 BN	6266	Low Reference
24	0.5 BK	2755	Low Reference
25	0.35 D-GN	7125	Super Charger Inlet Air Pressure Sensor Return
26	-	-	Not Used
27	0.5 GY/BK	6272	Low Reference
28	0.75 PK/BK	5290	Ignition 1 Voltage
29	0.5 TN	2752	Low Reference
30	0.35 BN/WH	6754	Low Reference
31	0.35 D-BU/WH	6756	Low Reference
32	0.8 PK/BK	1746	Fuel Injector 3 Control
33	0.8 OG	2127	IC 7 Control
34	0.8 D-GN	2125	IC 5 Control
35	0.8 BN	2129	Low Reference
36	0.5 D-GN	6457	5-Volt Reference
37	0.5 OG	6260	5-Volt Reference
38	0.5 PK	6261	5-Volt Reference
39	0.5 D-GN	6259	5-Volt Reference
40	0.35 GY	2705	5-Volt Reference
41	0.35 YE/BK	7124	5-Volt Reference
42	0.5 TN	2760	Low Reference
43	0.5 PU/WH	6270	5-Volt Reference
44	0.5 GY	2701	5-Volt Reference
45	0.35 BN	6273	Oil Temperature Sensor Low Reference
46	0.35 BN	6753	Low Reference
47	0.35 D-BU	6755	Low Reference
48	0.8 L-GN/BK	1745	Fuel Injector 2 Control
49	0.8 TN/WH	845	Fuel Injector 5 Control
50	0.35 WH/BK	6396	Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 1 Control
51	0.35 GY/BK	6394	Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 2 Control
52	0.8 L-BU/BK	844	Fuel Injector 4 Control
53	0.8 L-BU	2123	IC 3 Control
54	0.35 D-GN/WH	2124	IC 4 Control
55	0.35 PU/WH	2128	IC 5 Control
56	0.35 D-GN/WH	6264	Camshaft Position (CMP) Sensor - Exhaust Bank 1 Signal
57	0.35 OG/BK	6263	Camshaft Position (CMP) Sensor - Intake Bank 2 Signal
58	0.35 PK/BK	6262	Camshaft Position (CMP) Sensor - Exhaust Bank 2 Signal
59	0.35 D-BU/WH	6265	Camshaft Position (CMP) Sensor - Intake Bank 1 Signal
60	0.5 TN/WH	331	Oil Pressure Sensor Signal
61	-	-	Not Used
62	0.35 TN	472	IAT Sensor Signal
63	0.35 WH/BK	6271	CKP Sensor Signal
64	0.5 D-GN	485	TP Sensor 1 Signal
65	0.35 D-GN/WH	357	TCC Release Switch Signal
66	0.5 PU	486	TP Sensor 2 Signal
67	0.5 YE	492	MAF Sensor Signal
68	0.5 GY/WH	3113	HO2S Heater Low Control (Bank 1 Sensor 1)
69	0.5 GY/WH	3122	HO2S Heater Low Control (Bank 2 Sensor 1)
70	0.8 YE/BK	846	Fuel Injector 6 Control
71	0.8 OG/BK	877	Fuel Injector 7 Control
72	0.8 TN	1744	Fuel Injector 1 Control
73	2 BK/WH	1551	Ground

Connector Part Information

OEM: 34566-0103
Service: 88988931
Description: 73-Way F (BK)

Terminal Part Information

Pins: 1-9, 11-12, 14-25, 27, 29-44, 46-60, 62-64, 66-72
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: Pins 1-9, 14-25, 27, 29-44, 46-60, 62-64, 66-72 - J/J
Core/Insulation Crimp: Pins 11, 12 - K/K
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Pins: 13, 28, 45, 65
Terminal/Tray: 33467-0003/23
Core/Insulation Crimp: H/H
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

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