Engine Control Module (ECM) (L95, LXT)

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

Courtesy of GENERAL MOTORS CORP.

Engine Control Module (ECM) Connector Terminal Identification (L95, LXT)

Pin	Wire	Circuit	Function
1-2	-	-	Not Used
3	1.25 BK/WH	251	Ground
4	-	-	Ground
5	0.5 GY	435	Exhaust Gas Recirculation (EGR) Solenoid Low Control
6	0.5 D-GN/WH	465	Fuel Pump Relay Control
7	0.5 D-BU/WH	471	Main Relay Control
8	0.5 D-GN	135	Engine Coolant Temperature (ECT) Gage Signal
9	0.5 D-BU	473	High Speed - Cooling Fan Relay Control
10	0.5 D-GN	335	Low Speed - Cooling Fan Relay Control
11	0.5 BK/WH	51	Shield Ground
12	0.5 D-BU/WH	1876	Low Reference
13	0.5 OG/BK	469	Heated Oxygen Sensor (HO2S) 1 Heater Control
14	0.5 PU	1670	Heated Oxygen Sensor (HO2S) 2 Low Reference
15	-	-	Not Used
16	0.5 BN	413	Heated Oxygen Sensor (HO2S) 2 Heater Control
17	0.5 L-GN	632	Low Reference
18	-	-	Not Used
19	0.5 BK/YE	808	Low Reference
20	0.5 L-BU	203	A/C Refrigerant Pressure Sensor Signal
21	0.5 D-BU	1936	Fuel Level Sensor Signal
22	0.5 BN/WH	633	Camshaft Position (CMP) Sensor Signal
23	-	-	Not Used
24	1.25 BK/WH	251	Ground
25	0.5 BK/WH	51	Shield Ground
26	-	-	Not Used
27	0.5 L-BU	772	Octane Switch Signal (Non-OBD)
27	1.25 BK/WH	251	Ground (Euro Emissions)
28	1.25 BK/WH	251	Ground
29	0.85 PK	539	Ignition 1 Voltage
30	0.5 OG	440	Battery Positive Voltage
31	0.85 WH	423	Ignition Coil (IC) Timing Control (2 and 3)
32	0.85 OG	406	Ignition Coil (IC) Timing Control (1 and 4)
33	1.25 BK/WH	251	Ground
34	-	-	Not Used
35	0.5 BN/WH	1666	Heated Oxygen Sensor (HO2S) 1 Signal
36	-	-	Noy Used
37	0.5 WH/BK	962	Intake Manifold Tuning Valve Solenoid Control
38	-	-	Not Used
39	0.5 BN/WH	419	Multifunction Indicator Lamp (MIL) Control
40	0.5 PU	30	Fuel Level Sensor Signal
41	0.5 PU	67	A/C Compressor Clutch Coil Supply Voltage
42	0.5 YE/BK	496	Knock Sensor (KS) Signal
43	0.5 D-GN	534	High Idle Switch Signal
44	0.5 PU/WH	1665	Heated Oxygen Sensor (HO2S) 1 Low Reference (OBD)
44	0.5 PU/WH	1665	O2 Sensor Signal (Non OBD)
45	0.5 BN	1456	Exhaust Gas Recirculation (EGR) Valve Position Signal
46	0.5 GY	605	Low Reference
47-49	-	-	Not Used
50	0.5 L-BU/BK	1688	5-Volt Reference
51	0.5 D-GN/WH	817	Vehicle Speed Signal (Manual Transmission)
52	0.5 D-GN/WH	762	A/C Request Signal
53	0.5 WH	873	Rough Road Sensor Signal
53	0.5 D-BU	876	Rough Road Sensor Signal w/ABS
54	0.5 YE/BK	1868	Low Reference
55	0.5 PK	427	Idle Speed Control Motor Switch Signal
56	0.5 PU	2000	Keyword Serial Data
57	0.5 YE	710	CAN Serial Data Low (Automatic Transmission)
58	-	-	Not Used
59	0.5 BK	1744	Fuel Injector 1 Control
60	0.5 PK/BK	1746	Fuel Injector 3 Control
61	0.5 D-BU	426	Idle Motor Return
62	0.5 L-BU	425	Idle Motor Feed
63	-	-	Not Used
64	0.5 BN/WH	1671	Heated Oxygen Sensor (HO2S) 2 Signal
65	0.5 D-GN/WH	428	EVAP Canister Purge Solenoid Control
66	0.5 PK/BK	1846	Ignition 1 Voltage
67	1.25 BK/WH	251	Ground
68	0.5 WH	121	Engine Speed Signal
69	0.5 GY	435	Exhaust Gas Recirculation (EGR) Solenoid Low Control (Non OBD)
70-73	-	-	Not Used
74	0.5 D-BU	417	Throttle Position (TP) Sensor Signal
75	0.5 L-GN	432	Manifold Absolute Pressure (MAP) Sensor Signal
76	0.5 YE	410	Engine Coolant Temperature (ECT) Sensor Signal
77	-	-	Not Used
78	0.5 BN	472	Intake Air Temperature (IAT) Sensor Signal
79	0.5 GY	416	5-Volt Reference
80	-	-	Not Used
81	0.5 PU	773	Octane Switch Signal
81	0.5 BK/WH	251	Ground
82	-	-	Not Used
83	0.5 BN	990	Power Steering Pressure Switch Signal
84	0.5 OG	830	5-Volt Reference
85	0.5 D-BU/WH	1869	Crankshaft Position Sensor Signal
86-87	-	-	Not Used
88	0.5 PU	1807	CAN Serial Data High
89	0.5 L-BU/BK	844	Fuel Injector 4 Control
90	0.5 L-GN/BK	1745	Fuel Injector 2 Control

Connector Part Information

OEM: 211PC902S0008
Description: 90-Way F Connector (BK)