Engine Control Module (ECM) Connector End View C2

Fig 1: Connector End View

Courtesy of GENERAL MOTORS CORP.

Connector Part Information

OEM: 34566-2503
Service: 88988931
Description: 73-Way F Micro-Pack 64 Series (BK)

Terminal Part Information

Pins: 1-5, 8, 9, 11-14, 17, 20, 23, 27, 29, 30, 32, 33, 35, 36, 39, 42-44, 46, 48, 50, 53, 56, 59, 62-64, 66-69, 71, 72
Terminal/Tray: See Terminal Repair Kit
Core/Insulation Crimp: See Terminal Repair Kit
Release Tool/Test Probe: See Terminal Repair Kit

Pins: 73
Terminal/Tray: 7116-4152-02/9
Core/Insulation Crimp: 2/5
Release Tool/Test Probe: 12094430/J-35616-35 (VT)

Connector Terminal Identification

Pin	Wire Color	Circuit No.	Function
1	PU	2121	Ignition Control (1)
2	TN/WH	3111	Heated Oxygen Sensor Low Signal Sensor 1
3	PU/WH	3110	Heated Oxygen Sensor High Signal Sensor 1
4	PU/WH	1668	Heated Oxygen Sensor High Signal Sensor 2
5	TN/WH	1669	Heated Oxygen Sensor Low Signal Sensor 2
6-7	-	-	Not Used
8	D-BU	496	Knock Sensor Signal
9	GY	1716	Knock Sensor Signal
10	-	-	Not Used
11	YE	581	TAC Motor Control (1)
12	BN	582	TAC Motor Control (2)
13	PK/BK	5290	Ignition 1 Voltage
14	PK/BK	6395	CMP Actuator Solenoid Control Intake
15-16	-	-	Not Used
17	L-BU	2123	Ignition Control (3)
18-19	-	-	Not Used
20	GY	5296	Low Reference
21-22	-	-	Not Used
23	TN	5301	Low Reference
24-26	-	-	Not Used
27	PU	574	Low Reference
28	-	-	Not Used
29	TN	2752	Low Reference
30	L-GN	5282	Low Reference
31	-	-	Not Used
32	L-GN/BK	1745	Fuel Injector (2) Control
33	D-GN/WH	2124	Ignition Control (4)
34	-	-	Not Used
35	BN	2129	Low Reference
36	YE/BK	5297	5-Volt Reference
37-38	-	-	Not Used
39	D-BU	5300	5-Volt Reference
40-41	-	-	Not Used
42	TN	2760	Low Reference
43	L-GN	2867	5-Volt Reference
44	GY	2701	5-Volt Reference
45	-	-	Not Used
46	PU	5284	Low Reference
47	-	-	Not Used
48	PK/BK	1746	Fuel Injector Control (3)
49	-	-	Not Used
50	WH/BK	6396	CMP Actuator Solenoid Control Exhaust
51-52	-	-	Not Used
53	OG/WH	2122	Ignition Control (2)
54-55	-	-	Not Used
56	D-GN	5273	CMP Sensor Signal
57-58	-	-	Not Used
59	OG	5275	CMP Sensor Signal
60-61	-	-	Not Used
62	TN	472	Intake Air Temperature Sensor Signal
63	YE	573	Crankshaft Position Sensor Signal
64	D-GN	485	Throttle Position Sensor (1) Signal
65	-	-	Not Used
66	PU	486	Throttle Position Sensor (2) Signal
67	YE	492	Mass Air Flow Sensor Signal
68	GY/WH	3113	Heated Oxygen Sensor Heater Low Control Sensor 1
69	GY/WH	3122	Heated Oxygen Sensor Heater Low Control Sensor 2
70	-	-	Not Used
71	L-BU/BK	844	Fuel Injector (4) Control
72	TN	1744	Fuel Injector (1) Control
73	BK/WH	451	Signal Ground