Engine Control Module (ECM) Connector End Views

ECM Connector C1 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15418483 56-Way F Micro-Pack 64 Series (BU)
Pin	Wire Color	Circuit No.	Function
1	TN/BK	2500	High Speed GMLAN Serial Data Bus (+)
2	TN	2501	High Speed GMLAN Serial Data Bus (-)
3-4	-	-	Not Used
5	TN	1274	5-Volt Reference
6	-	-	Not Used
7	WH/BK	1164	5-Volt Reference
8-9	-	-	Not Used
10	WH	1310	EVAP Canister Vent Solenoid Control
11	OG/BK	380	A/C Refrigerant Pressure Sensor Signal
12	-	-	Not Used
13	WH	17	Stop Lamp Switch Signal
14	YE	447	Starter Relay Coil Control
15-16	-	-	Not Used
17	PK/BK	5290	Ignition 1 Voltage
18	PK	239	Ignition 1 Voltage
19	PK	239	Ignition 1 Voltage
20	RD/WH	1440	Battery Positive Voltage
21	L-BU	1162	APP Sensor 2 Signal
22	-	-	Not Used
23	D-GN/WH	465	Fuel Pump Relay Control - Primary
24	BN/WH	419	MIL Control
25	D-GN/WH	459	A/C Compressor Clutch Relay Control
26	-	-	Not Used
27	D-BU	1161	APP Sensor 1 Signal
28	BN	818	Vehicle Speed Signal
29	YE	492	MAF Sensor Signal
30	-	-	Not Used
31	TN	2760	Intake Air Temperature Sensor Low Reference
32	BK/WH	2751	Signal Ground
33	OG/WH	812	12-Volt Reference
34	-	-	Not Used
35	GY	2700	5-Volt Reference
36	BN	1271	Low Reference
37	PU	1272	Low Reference
38-41	-	-	Not Used
42	D-BU	473	High Speed Cooling Fan Relay Control
43	BN	5069	Main Relay Control
44-45	-	-	Not Used
46	YE/BK	5728	ECM/TCM Serial Data Wake Up
47-50	-	-	Not Used
51	TN	472	IAT Sensor Signal
52-54	-	-	Not Used
55	D-GN	335	Low Speed Cooling Fan Relay Control
56	-	-	Not Used

ECM Connector C2 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15418475 73-Way F 108-A (BK)
Pin	Wire Color	Circuit No.	Function
1-2	-	-	Not Used
3	D-GN	485	TP Sensor 1 Signal
4	PU	486	TP Sensor 2 Signal
5-7	-	-	Not Used
8	L-GN	432	MAP Sensor Signal
9	-	-	Not Used
10	YE	573	Crankshaft Position Sensor Signal (1)
11	L-BU	1876	Knock Sensor Signal (2)
12	GY	23	Generator Field Duty Cycle Signal
13	GY	1716	Knock Sensor Low Reference (1)
14	L-GN	5282	Camshaft Phaser Exhaust Solenoid (1)
15-16	-	-	Not Used
17	TN	1744	Fuel Injector 1 Control
18	L-GN/BK	1745	Fuel Injector 2 Control
19	D-BU	496	Knock Sensor 1 Signal
20	PK/BK	1746	Fuel Injector 3 Control
21	OG/BK	877	Fuel Injector 7 Control
22	TN/WH	845	Fuel Injector 5 Control
23	YE/BK	846	Fuel Injector 6 Control
24	D-BU/WH	878	Fuel Injector 8 Control
25	D-GN	5273	Camshaft Position Exhaust Sensor (1)
26	-	-	Not Used
27	BN/WH	5303	Camshaft Position Intake Sensor Low Reference (2)
28	GY	2303	Knock Sensor Low Reference (2)
29	PU	5284	Camshaft Phaser Intake Solenoid (1)
30	L-BU/BK	844	Fuel Injector Control (4)
31	OG/BK	5272	Camshaft Phaser Intake Solenoid (2)
32	OG	5275	Camshaft Position Intake Sensor (1)
33	D-BU	5300	Camshaft Position Intake Sensor Supply Voltage (1)
34	WH/BK	5283	Camshaft Phaser Exhaust Solenoid (2)
35	TN	5301	Camshaft Position Intake Sensor Low Reference (1)
36	OG/BK	469	Low Reference
37	TN	2752	Low Reference
38	TN	2761	Low Reference
39	BN/WH	2130	Low Reference
40	L-BU	5302	Camshaft Position Intake Sensor Supply Voltage (2)
41	PU	574	Low Reference
42	BN	2129	Low Reference
43	PU	5274	Camshaft Position Exhaust Sensor (2)
44	BN	582	TAC Motor Control - 2
45	GY	5296	Camshaft Position Exhaust Sensor Low Reference (1)
46	L-GN	5298	Camshaft Position Exhaust Sensor Supply Voltage (2)
47	BN	5299	Camshaft Position Exhaust Sensor Low Reference (2)
48	YE	581	TAC Motor Control - 1
49	YE	5276	Camshaft Position Intake Sensor (2)
50	L-GN	1867	12-Volt Reference
51	GY	2701	5-Volt Reference
52-53	-	-	Not Used
54	YE	410	ECT Sensor Signal
55	D-GN/WH	428	EVAP Canister Purge Solenoid Control
56-57	-	-	Not Used
58	PU	2121	IC 1 Control
59	OG/WH	2122	IC 2 Control
60	OG	2127	IC 7 Control
61	L-BU	2123	IC 3 Control
62	D-GN/WH	2124	IC 4 Control
63	PU/WH	2128	IC 8 Control
64	D-GN	2125	IC 5 Control
65	GY	2704	5-Volt Reference
66-67	-	-	Not used
68	OG	225	Generator Turn On Signal
69	L-BU/WH	2126	IC 6 Control
70	-	-	Not Used
71	YE/BK	5297	Camshaft Position Exhaust Sensor Supply Voltage (1)
72	-	-	Not Used
73	BK/WH	1551	Ground

ECM Connector C3 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15418484 56-Way F 105-B (GY)
Pin	Wire Color	Circuit No.	Function
1	PU/WH	3110	Heated Oxygen Sensor High Signal Bank 1 Sensor (1)
2	TN/WH	3111	Heated Oxygen Sensor Low Signal Bank 1 Sensor (1)
3	PU/WH	5281	Heated Oxygen Sensor Pump Current Bank 2 Sensor (1)
4-11	-	-	Not Used
12	D-BU	1936	Primary Fuel Level Sensor Signal
13	GY/WH	3122	Heated Oxygen Sensor Heater Low Control Bank 1 Sensor (2)
14-15	-	-	Not Used
16	OG/WH	3223	Heated Oxygen Sensor Heater Low Control Bank 2 Sensor (2)
17	-	-	Not Used
18	OG/BK	1786	Transmission Park/Neutral Signal (1)
19	TN/WH	3121	Heated Oxygen Sensor Low Signal Bank 1 Sensor (2)
20	PU	3220	Heated Oxygen Sensor High Signal Bank 2 Sensor (2)
21	TN	3221	Heated Oxygen Sensor Low Signal Bank 2 Sensor (2)
22	OG	5280	Heated Oxygen Sensor Input Pump Current Bank 2 Sensor (1)
23	BN	1174	Oil Level Switch Signal
24	L-BU	1937	Secondary Fuel Level Sensor Signal
25	TN/WH	331	Oil Pressure Sensor Signal
26-36	-	-	Not Used
37	TN	2759	Fuel Tank Pressure Sensor Low Reference
38	BK	2755	Oil Pressure Sensor Low Reference
39	-	-	Not Used
40	GY/WH	3113	Heated Oxygen Sensor Heater Low Control Bank 1 Sensor (1)
41	L-GN	3212	Heated Oxygen Sensor Heater Low Control Bank 2 Sensor (1)
42	GY	2709	5-Volt Reference (LH1/LH2)
43	PU	3120	Heated Oxygen Sensor High Signal Bank 1 Sensor (2)
44	D-GN	890	Fuel Tank Pressure Sensor Signal
45	PU/WH	3210	Heated Oxygen Sensor High Signal Bank 2 Sensor (1)
46	TN/WH	3211	Heated Oxygen Sensor Low Signal Bank 2 Sensor (1)
47	-	-	Not Used
48	WH	5279	Heated Oxygen Sensor Pump Current Bank 1 Sensor (1)
49	L-GN	5278	Heated Oxygen Sensor Input Pump Current Bank 1 Sensor (1)
50	-	-	Not Used
51	GY	2705	Oil Pressure Sensor 5-Volt Reference
52-56	-	-	Not Used