Engine Control Module (ECM) Connector End Views

ECM C1

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15452125 56-Way F Micro 64 Sealed (BU)
Pin	Wire Color	Circuit No.	Function
1	PU	1589	Fuel Level Sensor Signal
2	L-BU	1162	APP Sensor 2 Signal
3	D-GN	890	Fuel Tank Pressure Sensor Signal
4	D-BU	1161	APP Sensor 1 Signal
5	-	-	Not Used
6	D-GN	1433	PNP/Clutch Start Switch Signal
7	-	-	Not Used
8	BN/WH	379	CPP Switch Signal
9	PU	420	TCC Brake Switch/Cruise Control Release Signal
10	WH/BK	1164	5-Volt Reference
11	L-BU	20	Stop Lamp Switch Signal
12	BN	4	Accessory Voltage
13	GY	705	5-Volt Reference
14	D-GN/WH	465	Fuel Pump Relay Control
15	D-BU	1884	Cruise Control Switch Signal
16	PU	1807	Class 2 Serial Data
17	PU	1807	Class 2 Serial Data (ABS)
18	BN	5069	Main Relay Control
19-26	-	-	Not Used
27	YE	1139	Ignition 1 Voltage
28-29	-	-	Not Used
30	WH	1310	EVAP Canister Vent Solenoid Control
31	D-GN/WH	459	A/C Compressor Clutch Relay Control
32-40	-	-	Not Used
41	PU	1272	Low Reference
42-44	-	-	Not Used
45	BN/WH	419	MIL Control
46	YE	447	Starter Relay Coil Control
47-50	-	-	Not Used
51	OG	480	Battery Positive Voltage
52	-	-	Not Used
53	BN	1271	Low Reference
54	BK	2759	Low Reference
55	-	-	Not Used
56	TN	1274	5-Volt Reference

ECM C2

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15471389 (MN5) 15471385 (M86) 73-Way F GT 280 Micro 64 Sealed (BK)
Pin	Wire Color	Circuit No.	Function
1-2	-	-	Not Available
3	YE	581	TAC Motor Control - 1
4	-	-	Not Available
5	BN	582	TAC Motor Control - 2
6-9	-	-	Not Available
10	BK	1744	Fuel Injector 1 Control
11	PK/BK	1746	Fuel Injector 3 Control
12	L-BU/BK	844	Fuel Injector 4 Control
13	L-GN/BK	1745	Fuel Injector 2 Control
14	-	-	Not Available
15	D-GN/WH	428	EVAP Canister Purge Solenoid Control
16	-	-	Not Available
17	BK/WH	1423	HO2S Heater Low Control - 1
18	YE	400	Signal High - Front/VSS High Signal/OSS High Signal (M/T)
	-	-	Not Available (A/T)
19	PU	401	Signal Low - Front VSS Low Signal/OSS Low Signal (M/T)
	-	-	Not Available (A/T)
20-23	-	-	Not Available
24	GY	2701	5-Volt Reference
25	GY	2704	5-Volt Reference
26	L-BU/BK	1688	5-Volt Reference
27	-	-	Not Available
28	GY	2700	5-Volt Reference (C60)
29	BK/WH	1704	Low Reference
30	-	-	Not Available
31	BK	2752	Low Reference
32-33	-	-	Not Available
34	PK/BK	5290	Ignition 1 Voltage
35	-	-	Not Available
36	PU	486	TP Sensor 2 Signal
37	-	-	Not Available
38	BK	2760	Low Reference
39	-	-	Not Available
40	OG/BK	469	Low Reference
41	PU	1666	HO2S High Signal - 1
42	TN	1667	HO2S Low Signal - 1
43	PU/WH	1668	HO2S High Signal - 2
44	TN/WH	1669	HO2S Low Signal - 2
45-46	-	-	Not Availble
47	D-GN	335	Low Speed Cooling Fan Relay Control
48	TN/BK	231	Oil Pressure Switch Signal
49	RD/BK	380	A/C Refrigerant Pressure Sensor Signal (C60)
50	YE	410	ECT Sensor Signal
51	GY	23	Generator Field Duty Cycle Signal
52	YE	492	MAF Sensor Signal
53	D-GN	676	HO2S Heater Low Control - 1
54	WH	423	IC Timing Control
55	OG	406	IC Timing Control (B)
56-57	-	-	Not Available
58	D-GN	485	TP Sensor 1 Signal
59	BK	2751	Low Reference (C60)
60	-	-	Not Availble
61	BK	2761	Low Reference
62	L-GN	432	MAP Sensor Signal
63	RD	225	Generator Turn On Signal
64	TN/WH	2500	High Speed GMLAN Serial Data Bus +
65	TN	2501	High Speed GMLAN Serial Data Bus -
66	YE	573	CKP Sensor Signal
67	PU	574	Low Reference
68	TN	472	IAT Sensor Signal
69	-	-	Not Available
70	BN/WH	633	CMP Sensor Signal
71	GY	1716	Low Reference
72	D-BU	496	Knock Sensor Signal
73	BK/WH	451	Ground