Engine Control Module (ECM) Connector End Views

Engine Control Module (ECM) C1 Terminal Identification

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15418474 56-Way Micro 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	OG	5371	Stop Lamp Switch Signal
14	YE	447	Starter Relay Coil Control
15	PU	1807	Class 2 Serial Data (Primary)
16	PU	1807	Class 2 Serial Data (Primary)
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	WH	121	Engine Speed Signal
27	D-BU	1161	APP Sensor 1 Signal
28	BN	818	Vehicle Speed Signal
29	YE	492	MAF Sensor Signal
30	PK/WH	1101	Damping Lift/Dive Signal (F55)
31	TN	2760	Low Reference
32	TN	470	Low Reference
33	OG/WH	812	12-Volt Reference or I/P Dimming Voltage 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	-	-	Not Used
45	GY	847	Extended Travel Brake Switch Signal
46	YE	343	Accessory Voltage
47-48	-	-	Not Used
49	YE/BK	5270	Traction Control Data Signal
50	-	-	Not Used
51	TN	472	IAT Sensor Signal
52	-	-	Not Used
53	GY	1884	Cruise Control Set/Coast and Resume/Accelerate Switch Signal
54	YE	5	Crank Voltage
55	D-GN	335	Low Speed Cooling Fan Relay Control
56	-	-	Not Used

Engine Control Module (ECM) C2 Terminal Identification

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15460228 73-Way F Micro 64 Series (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	CKP Sensor 1 Signal
11	L-BU	1876	Knock Sensor 2 Signal
12	GY	23	Generator Field Duty Cycle Signal
13	GY	1716	Low Reference
14	L-GN	5282	CMP Actuator Solenoid Control Exhaust Bank 1
15-16	-	-	Not Used
17	TN	1744	Fuel Injector 1 Control
18	OG/BK	1745	Fuel Injector 2 Control
19	D-BU	496	Knock Sensor 1 Signal
20	L-BU/BK	1746	Fuel Injector 3 Control
21	OG/BK	877	Fuel Injector 7 Control
22	L-GN/BK	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	CMP Sensor Signal Exhaust Bank 1
26	-	-	Not Used
27	BN/WH	5303	Low Reference
28	GY	2303	Low Reference
29	PU	5284	CMP Actuator Solenoid Control Intake Bank 1
30	YE/BK	844	Fuel Injector 4 Control
31	OG/BK	5272	CMP Actuator Solenoid Control Intake Bank 2
32	OG	5275	CMP Sensor Signal Intake Bank 1
33	D-BU	5300	12-Volt Reference
34	WH/BK	5283	CMP Actuator Solenoid Control Exhaust Bank 2
35	TN	5301	Low Reference
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	12-Volt Reference
41	PU	574	Low Reference
42	BN	2129	Low Reference
43	PU	5274	CMP Sensor Signal Exhaust Bank 2
44	TN	582	TAC Motor Control - 2
45	GY	5296	Low Reference
46	L-GN	5298	12-Volt Reference
47	BN	5299	Low Reference
48	YE	581	TAC Motor Control - 1
49	YE	5276	CMP Sensor Signal Intake Bank 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	12-Volt Reference
72	-	-	Not Used
73	BK/WH	1551	Ground

Engine Control Module (ECM) C3 Terminal Identification

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15418476 56-Way F Micro 64 Series (GY)
Pin	Wire Color	Circuit No.	Function
1	PU	1666	HO2S High Signal - Bank 2 Sensor 1
2	TN	1667	HO2S Low Signal - Bank 2 Sensor 1
3	PU/WH	5281	HO2S Output Pump Current Bank 1 Sensor 1
4-11	-	-	Not Used
12	D-BU	1936	Fuel Level Sensor Signal - Secondary
13	YE	5036	HO2S Heater Low Control - Bank 1 Sensor 2
14	OG/BK	463	Requested Torque Signal
15	-	-	Not Used
16	PU	5035	HO2S Heater Low Control - Bank 2 Sensor 2
17	TN/BK	464	Delivered Torque Signal
18	OG/BK	1786	Ignition Lock Cylinder Control Actuator Signal
19	TN	1671	HO2S Low Signal - Bank 2 Sensor 2
20	PU/WH	1668	HO2S High Signal - Bank 2 Sensor 2
21	TN/WH	1669	HO2S Low Signal - Bank 2 Sensor 2
22	OG	5280	HO2S Input Pump Current Bank 1 Sensor 1
23	BN	1174	Oil Level Switch Signal
24	L-BU	1937	Fuel Gage Sensor - Signal - Right
25	TN/WH	331	Oil Pressure Sensor Signal
26-36	-	-	Not Used
37	TN	452	Low Reference
38	BK	2755	Low Reference
39	-	-	Not Used
40	PU/WH	5037	HO2S Heater Low Control - Bank 1 Sensor 1
41	L-BU	5038	HO2S Heater Low Control - Bank 2 Sensor 1
42	GY	2709	5-Volt Reference
43	PU	1670	HO2S High Signal - Bank 2 Sensor 2
44	D-GN	890	Fuel Tank Pressure Sensor Signal
45	PU/WH	1665	HO2S High Signal - Bank 1 Sensor 1
46	TN/WH	1653	HO2S Low Signal - Bank 1 Sensor 1
47	-	-	Not Used
48	WH	5279	HO2S Output Pump Current Bank 2 Sensor 1
49	L-GN	5278	HO2S Input Pump Current Bank 2 Sensor 1
50	-	-	Not Used
51	GY	2705	5-Volt Reference
52-56	-	-	Not Used