Engine Control Module (ECM) Connectors

WARNING: This page is about a different car, the 2006 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Engine Control Module (ECM) C1

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		OEM: 34566-4403 (Molex) Service: See Catalog 73-Way F MX123 Harness Connector Assembly (BK)
Pin	Wire Color	Circuit No.	Function
1-3	-	-	Not Used
4	PU/WH	1035	Starter Relay Coil Supply Voltage
5	-	-	Not Used
6	GY	48	CPP Switch Signal
7-8	-	-	Not Used
9	WH	17	Stop Lamp Switch Signal
10	PU/WH	1668	HO2S High Signal Bank 1 Sensor 2
11	TN/WH	1669	HO2S Low Signal Bank 1 Sensor 2
12	OG/BK	380	A/C Refrigerant Pressure Sensor Signal
13	BK/WH	2751	Low Reference
14-15	-	-	Not Used
16	D-BU	1936	Fuel Level Sensor Signal - Secondary
17	-	-	Not Used
18	YE	43	Accessory Voltage
19	PK	1439	Ignition 1 Voltage
20	RD/WH	2440	Battery Positive Voltage
21-22	-	-	Not Used
23	PU	1272	Low Reference
24	D-GN	890	Fuel Tank Pressure Sensor Signal
25-26	-	-	Not Used
27	TN	2501	ECM High Speed GMLAN Serial Data Bus -
28	TN/BK	2500	ECM High Speed GMLAN Serial Data Bus +
29	D-BU	1161	APP Sensor 1 Signal
30	BN	1271	Low Reference
31	TN	2759	Low Reference
32	L-BU	1162	APP Sensor 2 Signal
33	GY	2709	5-Volt Reference
34	GY	2700	5-Volt Reference
35	-	-	Not Used
36	TN	1274	5-Volt Reference
37	TN	472	IAT Sensor Signal
38	TN	2760	Low Reference
39-40	-	-	Not Used
41	YE	492	MAF Sensor Signal
42-46	-	-	Not Used
47	PK	439	Ignition 1 Voltage
48	WH	121	Engine Speed Signal
49	TN	1671	HO2S Low Signal Bank 2 Sensor 2
50	D-GN/WH	465	Fuel Pump Relay Control
51-55	-	-	Not Used
56	WH/BK	1164	5-Volt Reference
57	D-GN/WH	817	Vehicle Speed Signal
58	D-GN	335	Cooling Fan Relay Control
59	WH/BK	448	Ignition 1 Relay Control
60	-	-	Not Used
61	WH	1310	EVAP Canister Vent Solenoid Control
62	-	-	Not Used
63	D-GN/WH	459	A/C Compressor Clutch Relay Control
64	OG/WH	3223	HO2S Heater Low Control Bank 2 Sensor 2
65	BN	2391	HO2S Heater Low Control Bank 1 Sensor 2
66	GY	587	Skip/Shift Solenoid Control
67	YE/BK	625	Starter Enable Relay Control
68	BN/WH	419	MIL Control
69	PU	1670	HO2S High Signal Bank 2 Sensor 2
70	L-BU	1937	Fuel Level Sensor Signal - Right
71	YE	400	VSS High Signal
72	PU	401	VSS Low Signal
73	BK/WH	451	Ground

Engine Control Module (ECM) C2

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		OEM: 34566-4503 (Molex) Service: See Catalog 80-Way F MX123 Harness Connector Assembly (GY)
Pin	Wire Color	Circuit No.	Function
1	-	-	Not Used
2	L-GN	1867	5-Volt Reference
3	L-BU/BK	1688	5-Volt Reference
4	-	-	Not Used
5	BN	582	TAC Motor Control - 2
6	YE	581	TAC Motor Control - 1
7	-	-	Not Used
8	D-GN/WH	428	EVAP Canister Purge Solenoid Valve Control
9-10	-	-	Not Used
11	L-GN	1652	Reverse Lockout Solenoid Control
12	GY/WH	3113	HO2S Heater Low Control Bank 1 Sensor 1
13	L-GN	3212	HO2S Heater Low Control Bank 2 Sensor 1
14-16	-	-	Not Used
17	D-BU/WH	878	Fuel Injector 8 Control
18	TN/WH	845	Fuel Injector 5 Control
19	YE/BK	846	Fuel Injector 6 Control
20	TN	1744	Fuel Injector 1 Control
21	YE	410	ECT Sensor Signal
22	TN	2761	Low Reference
23	TN/WH	585	Transmission Fluid Temperature Sensor Signal
24	OG/BK	586	Transmission Fluid Temperature Sensor Low Reference
25	-	-	Not Used
26	D-BU	496	Knock Sensor 1 Signal
27	GY	1716	Low Reference
28	-	-	Not Used
29	L-BU	1876	Knock Sensor 2 Signal
30	GY	2303	Low Reference
31	-	-	Not Used
32	GY	23	Generator Field Duty Cycle Signal
33	-	-	Not Used
34	BK	2755	Low Reference
35	TN/WH	1704	Low Reference
36	-	-	Not Used
37	L-GN/BK	1745	Fuel Injector 2 Control
38	PK/BK	1746	Fuel Injector 3 Control
39	L-BU/BK	844	Fuel Injector 4 Control
40	OG/BK	877	Fuel Injector 7 Control
41	GY	2705	5-Volt Reference
42	-	-	Not Used
43	GY	2704	5-Volt Reference
44	OG	631	5-Volt Reference
45-49	-	-	Not Used
50	TN/WH	331	Oil Pressure Sensor Signal
51-52	-	-	Not Used
53	OG/BK	469	Low Reference
54-55	-	-	Not Used
56	TN	1664	HO2S Low Signal Bank 1 Sensor 1
57	PU/WH	1665	HO2S High Signal - Bank 1 Sensor 1
58	L-GN	432	MAP Sensor Signal
59	PU	1666	HO2S High Signal Bank 2 Sensor 1
60	TN	1667	HO2S Low Signal Bank 2 Sensor 1
61	OG	225	Generator Turn On Signal
62	-	-	Not Used
63	PU	486	TP Sensor 2 Signal
64	BN/WH	633	CMP Sensor Signal
65	D-GN	485	TP Sensor 1 Signal
66	PK/BK	632	Low Reference
67	-	-	Not Used
68	D-BU/WH	1869	CKP Sensor Signal
69	YE/BK	1868	Low Reference
70	PU	2121	IC 1 Control
71	PU/WH	2128	IC 8 Control
72	OG	2127	IC 7 Control
73	OG/WH	2122	IC 2 Control
74	L-BU/WH	2126	IC 6 Control
75	D-GN	2125	IC 5 Control
76	D-GN	2124	IC 4 Control
77	L-BU	2123	IC 3 Control
78	BN	2129	Low Reference
79	BN/WH	2130	Low Reference
80	-	-	Not Used