Engine Control Module (ECM) Connector End View C3

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		9123-7148 56-Way F (GY)
Pin	Wire Color	Circuit No.	Function
1	-	-	Not Used
2	L-BU	3223	HO2S Bank 1 Sensor 2 Heater Control
3	RD/WH	3122	HO2S Bank 2 Sensor 2 Heater Control
4-10	-	-	Not Used
11	BN/WH	492	MAF Sensor Signal
12-17	-	-	Not Used
18	BN/RD	1669	HO2S Low Signal Bank 1 Sensor 2
19	PU/WH	1668	HO2S High Signal Bank 1 Sensor 2
20	PU/BK	1670	HO2S High Signal Bank 2 Sensor 2
21	BN/BU	1671	HO2S Low Signal Bank 2 Sensor 2
22	OG/BK	1786	Park/Neutral Signal
23	-	-	Not Used
24	BK	2759	Low Reference
25-33	-	-	Not Used
34	BK	472	IAT Sensor Signal
35-42	-	-	Not Used
44	BN/OG	401	VSS Low Signal
45	BU/WH	400	VSS High Signal
46-47	-	-	Not Used
48	GY	587	Skip Shift Solenoid Control
49	BK	2759	Low Reference
50	-	-	Not Used
51	L-GN/BK	459	A/C Compressor Clutch Relay Control
52-56	-	-	Not Used