Engine Control Module (ECM) Connector End Views

Engine Control Module (ECM) - C1

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15357147 56-Way F Micro 64 (BU)
Pin	Wire Color	Circuit No.	Function
1	YE	2361	SAE J1939 Serial Data Bus +
2	D-GN	2362	SAE J1939 Serial Data Bus -
3-4	-	-	Not Used
5	OG	440	Battery Positive Voltage
6	-	-	Not Used
7	OG/BK	1057	Low Reference
8	PK/BK	632	Low Reference
9	BK/WH	451	Ground
10	PK	439	Ignition 1 Voltage
11-12	-	-	Not Used
13	YE	492	MAF Sensor Signal
14	BN/WH	5763	EGR Valve Position Signal
15	D-GN	1049	Class 2 Serial Data
16	-	-	Not Used
17	TN	1274	5-Volt Reference
18	PK	1020	Ignition 0 Voltage
19	PK	439	Ignition 1 Voltage
20	OG	440	Battery Positive Voltage
21	GY	2700	5-Volt Reference
22	-	-	Not Used
23	OG/BK	5929	5-Volt Reference
24-25	-	-	Not Used
26	D-BU	507	Wait to Start Indicator Control
27	-	-	Not Used
28	L-BU	1162	APP Sensor 2 Signal
29	-	-	Not Used
30	PU/WH	1589	Fuel Level Sensor Signal - Primary
31	WH/BK	2932	5-Volt Reference
32	WH/BK	1164	5-Volt Reference
33	TN	2917	5-Volt Reference
34	GY	2705	5-Volt Reference
35	-	-	Not Used
36	YE/BK	1275	5-Volt Reference
37	YE	2834	Fuel Pressure Regulator Solenoid Control
39	GY	597	5-Volt Reference
40	PU/WH	2530	Fuel Pressure Regulator Solenoid Supply Voltage
41	GY	23	Generator Field Duty Cycle Signal
42	PK	1039	Ignition 1 Voltage
43	D-BU	1936	Fuel Level Sensor Signal - Secondary
44	D-GN/WH	465	Fuel Pump Relay Control
45	-	-	Not Used
46	YE/BK	1827	Vehicle Speed Signal
47	GY	2703	5-Volt Reference
48-49	-	-	Not Used
50	RD	631	12-Volt Reference
51	YE	2834	Fuel Pressure Regulator Solenoid Control
52	GY/BK	2219	FICM Relay Control
53	D-GN/WH	817	Vehicle Speed Signal
54	PU/WH	2530	Fuel Pressure Regulator Solenoid Supply Voltage
55	-	-	Not Used
56	PK	1039	Ignition 1 Voltage

Engine Control Module (ECM) - C2

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15357131 73-Way F Micro 64 (BK)
Pin	Wire Color	Circuit No.	Function
1	-	-	Not Used
2	OG/BK	2919	Low Reference
3	-	-	Not Used
4	BN	25	Charge Indicator Control
5-6	-	-	Not Used
7	GY/BK	1694	4WD Low Signal
8	BK	2754	Low Reference
9-12	-	-	Not Used
13	BK	2751	Low Reference
14	GY	720	Low Reference
15-16	-	-	Not Used
17	YE/BK	508	Water in Fuel Indicator Control
18	-	-	Not Used
19	D-BU	1161	APP Sensor 1 Signal
20	-	-	Not Used
21	D-BU	2466	Trans MIL Request
22	-	-	Not Used
23	L-GN	432	Turbocharger Boost Sensor Signal
24	D-GN	1163	APP Sensor 3 Signal
25	TN/WH	332	Oil Pressure Sensor Signal
26	BN	1174	Oil Level Switch Signal
27	YE	1578	Fuel Temperature Signal
28	L-GN	1867	12-Volt Reference
29	GY/BK	2931	Low Reference
30	OG/BK	469	Low Reference
31	YE	5947	Turbocharger Vane Position Sensor Signal
32	-	-	Not Used
33	OG/BK	5764	EGR Motor High Control
34	-	-	Not Used
35	L-GN/ BK	5746	EGR Motor Low Control
36	BK/WH	451	Ground
37	-	-	Not Used
38	L-GN	1478	Coolant Level Switch Signal
39	BK	2755	Low Reference
40	BN	1271	Low Reference
41	-	-	Not Used
42	YE	2918	FRP Sensor Signal
43	-	-	Not Used
44	TN	5928	Low Reference
45	-	-	Not Used
46	GY/BK	433	Baro Sensor Signal
47-48	-	-	Not Used
49	D-BU	5930	Turbocharger Vane Position Control Solenoid Valve Control
50	WH	5931	Low Reference
51	-	-	Not Used
52	PK/BK	1746	Fuel Injector 3 Control
53	OG/BK	5764	EGR Motor High Control
54	PU	1272	Low Reference
55	L-GN/ BK	5746	EGR Motor Low Control
56	GY	1273	Low Reference
57	BN	2524	Generator 2 Turn on Signal
58	BK	552	Low Reference
59	-	-	Not Used
60	L-BU	1320	CHMSL Supply Voltage
61	PU	420	TCC Brake Switch/Cruise Control Release Signal
62	-	-	Not Used
63	L-BU	2832	Engine Speed Signal
64	BK	470	Low Reference
65	L-GN/BK	1745	Fuel Injector 2 Control
66	RD/BK	877	Fuel Injector 7 Control
67	YE	410	ECT Sensor Signal
68	D-BU/WH	878	Fuel Injector 8 Control
69	L-BU/BK	844	Fuel Injector 4 Control
70	BK/WH	845	Fuel Injector 5 Control
71	YE/BK	846	Fuel Injector 6 Control
72	BK	1744	Fuel Injector 1 Control
73	BK/WH	451	Ground

Engine Control Module (ECM) - C3

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15357148 56-Way F Micro 64 (GY)
Pin	Wire Color	Circuit No.	Function
1	L-BU	494	PTO Engine Kill Signal (PTO)
2-5	-	-	Not Used
6	L-GN	488	PTO on Switch Signal (PTO)
7	-	-	Not Used
8	BK/WH	1695	Front Axle Switch Signal
9	-	-	Not Used
10	PK	1039	Ignition 1 Voltage
11	-	-	Not Used
12	PU/WH	821	VSS High Signal (ML6)
12	YE	400	VSS High Signal (M74)
13	-	-	Not Used
14	PK	1039	Ignition 1 Voltage
15-16	-	-	Not Used
17	YE	2522	PTO Engage Signal (PTO)
18	PU	806	Crank Voltage
19	D-BU	84	Cruise Control Set/Coast Switch Signal
20-21	-	-	Not Used
22	GY/BK	87	Cruise Control Resume/Accel Switch Signal
23	L-GN/BK	822	VSS Low Signal (ML6)
24	TN	472	IAT Sensor Signal
25-29	-	-	Not Used
30	GY	397	Cruise Control on Switch Signal
31	OG/BK	1786	Park/Neutral Signal
32	-	-	Not Used
33	RD/BK	380	A/C Refrigerant Pressure Sensor Signal
34	-	-	Not Used
35	YE/BK	625	Starter Enable Relay Control
36	-	-	Not Used
37	WH	121	Engine Speed Signal
38	-	-	Not Used
39	PU	2562	PTO Control (PTO)
40	BN/WH	419	MIL Control
41	D-GN/WH	459	A/C Compressor Clutch Relay Control
42	-	-	Not Used
43	YE/BK	1868	Low Reference
44	BK/WH	451	Ground
45	GY	1524	Backup Lamp Supply Voltage
46	-	-	Not Used
47	GY	48	CPP Switch Signal
48	BN	718	Low Reference
49-50	-	-	Not Used
51	BN/WH	633	CMP Sensor Signal
52	D-BU/WH	1869	CKP Sensor Signal
53-56	-	-	Not Used