Engine Control Module (ECM) Connector End Views

Engine Control Module (ECM) C1

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		AMP 368376 81-Way F 81POS Receptacle Hsg Assembly (BK)
Pin	Wire Color	Circuit Number	Function
1	-	-	Not Used
2	BK	251	Ground
3	D-BU	426	Idle Motor Feed
4	OG	440	Battery Positive Voltage
5	OG/BK	425	Idle Motor Return
6	D-GN/WH	817	Vehicle Speed Signal
7	D-BU/BK	480	Rough Road Signal
8	PU/WH	1665	Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Signal
9	D-GN/WH	1664	Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Signal
10	YE	492	Mass Air Flow (MAF) Sensor Signal
11	D-GN/WH	1456	Exhaust Gas Recirculation (EGR) Valve Position Sensor Signal
12	L-GN	432	Manifold Absolute Pressure (MAP) Sensor Signal
13	RD/BK	380	A/C Pressure Sensor Signal
14-16	-	-	Not Used
17	D-BU/WH	1936	Fuel Level Sensor Signal
18	BN/WH	633	Camshaft Position (CMP) Sensor Signal
19	D-BU/WH	1869	Crankshaft Position (CKP) Signal
20	-	-	Not Used
21	RD	427	Idle Switch Position
22	WH/BK	1922	CAN Serial Data Low
23	D-GN/BK	2905	Serial Data
24	D-BU/BK	844	Fuel Injector 4 Control
25	D-GN/WH	762	A/C Request Signal
26	PU	1666	Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Signal
27	D-GN	1663	Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Signal
28	D-BU/WH	417	Idle Motor Position Signal
29	D-GN	534	Throttle Position (TP) Sensor Signal
30	-	-	Not Used
31	BN	472	Intake Air Temperature (IAT) Sensor Signal
32-35	-	-	Not Used
36	YE	410	Engine Coolant Temperature (ECT) Sensor Signal
37	-	-	Not Used
38	YE/BK	1868	Low Reference
39	-	-	Not Used
40	WH/BK	448	Keyword Serial Data
41	YE/BK	1921	CAN Serial Data High
42	YE/BK	846	Fuel Injector 6 Control
43	L-GN/BK	1745	Fuel Injector 2 Control
44	BK/WH	1057	Shield Ground
45-47	-	-	Not Used
48	GY/BK	469	5-Volt Reference
49	GY	416	5-Volt Reference
50	GY	474	5-Volt Reference
51	GY/BK	605	Low Reference
52	D-GN	890	Fuel Tank Pressure (FTP) Sensor Signal
53-59	-	-	Not Used
60	GY/BK	435	Exhaust Gas Recirculation (EGR) Solenoid Control
61	D-BU/BK	845	Fuel Injector 5 Control
62	BK	1744	Fuel Injector 1 Control
63	D-BU/WH	1876	Knock Sensor 2 Signal
64	WH	496	Knock Sensor 1 Signal
65	BK	470	Low Reference
66	BK	650	Low Reference
67	BK	750	Low Reference
68	L-BU/BK	808	Low Reference
69	YE/BK	452	Low Reference
70	D-BU/BK	632	Low Reference
71	BK/WH	645	Low Reference
72-75	-	-	Not Used
76	BK	1704	Low Reference
77	-	-	Not Used
78	BK/WH	251	Ground
79	PK/D-BU	539	Ignition 1 Voltage
80	D-GN/WH	428	EVAP Canister Purge Valve Solenoid Control
81	RD/BK	1746	Fuel Injector 3 Control

Engine Control Module (ECM) C2

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		AMP 368383 40-Way F 40POS Receptacle Hsg Assembly (BK)
Pin	Wire Color	Circuit Number	Function
82	-	-	Not Used
83	BK/WH	251	Ground
84	-	-	Not Used
85	D-GN	135	Engine Coolant Temperature (ECT) Sensor Signal
86-87	-	-	Not Used
88	BK/WH	251	Ground
89	BN	1667	Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Heater Control
90-91	-	-	Not Used
92	PU/WH	1885	MIL Control
93	D-GN	335	Low Speed Cooling Fan Relay Control
94	WH/BK	1655	Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Heater Control
95-96	-	-	Not Used
97	BN/WH	1653	Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Heater Control
98	-	-	Not Used
99	D-GN/WH	465	Fuel Pump Relay Control
100	-	-	Not Used
101	WH	121	Engine Speed Signal
102	D-BU	473	High Speed Cooling Fan Relay Control
103-104	-	-	Not Used
105	WH	1654	Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Heater Control
106	PU/WH	67	A/C Clutch Relay Control
107	YE	130	Fuel Level Sensor Signal
108	WH/BK	962	Intake Manifold Tuning Valve Solenoid Control
109	-	-	Not Used
110	OG/BK	1029	Main Relay Control
111-112	-	-	Not Used
113	PU	1986	EVAP Canister Vent Solenoid Control
114	BK	350	Ground
115	L-BU	1153	Ignition Coil 1 Control
116	D-BU	1154	Ignition Coil 2 Control
117	D-GN	1157	Ignition Coil 5 Control
118	GY	1158	Ignition Coil 6 Control
119	PK/BK	1846	Main Relay Voltage
120	RD	1156	Ignition Coil 4 Control
121	YE	1155	Ignition Coil 3 Control