Engine Control Module (ECM) Connector End Views

WARNING: This page is about a different car, the 2005 Saturn Ion 3, 2005 Saturn Ion 2, and 2005 Saturn Ion 1. However, it is still accessible from the selected car via links, so may be relevant.

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)
18	-	-	Not Available (A/T)
19	PU	401	Signal Low - Front VSS Low Signal/OSS Low Signal (M/T)
19	-	-	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