PCM Connector C3 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information			15357148 (early) 15430220 (late) 56-Way F Micro 64 (GRY)
Pin	Wire Color	Circuit No.	Function
1	PNK	1224	Transmission Fluid Pressure Switch Signal A
2	YEL/BLK	1223	2-3 Shift Solenoid or Shift Solenoid B Valve Control
3	LT BLU/WHT	1229	PC Solenoid Valve Low Control (Sol. A)
4	TAN/BLK	464	Delivered Torque Signal
5	YEL	772	Transmission Range Switch Signal B?
6	GRY	773	Transmission Range Switch Signal C
7	WHT	776	Transmission Range Switch Signal P
8	-	-	Not Used
9	WHT	905	Not Used
10	YEL/BLK	1227	TFT Sensor Signal
11	YEL	492	MAF Sensor Signal
12-15	-	-	Not Used
16	LT GRN	3212	HO2S Heater Low Control (Bank 2 Sensor 1)
17-18	-	-	Not Used
19	TAN/WHT	3211	HO2S Low Signal (Bank 2 Sensor 1)
20-21	-	-	Not Used
22	PPL	401	Signal Low - Front/VSS Low Signal/OSS Low Signal
23-26	-	-	Not Used
27	ORN/BLK	463	Requested Torque Signal
28-31	-	-	Not Used
32	BLK/WHT	771	Transmission Range Switch Signal A
33	DK BLU/WHT	1231	AT ISS Low Signal
34	BLK	2760	Low Reference (IAT)
35	BLK	2762	Low Reference (Trans Fluid Temp Sensor)
36-42	-	-	Not Used
43	PPL/WHT	3210	HO2S High Signal (Bank 2 Sensor 1)
44	LT GRN	1222	(1-2 Shift Solenoid or Shift Solenoid A) Valve Control
45	RED/BLK	1228	PC Solenoid Valve High Control (Sol. A)
46	-	-	Not Used
47	YEL	400	Signal High - Front/VSS High Signal/OSS High Signal
48	RED	1226	Transmission Fluid Pressure Switch Signal C
49-50	-	-	Not Used
51	TAN	472	IAT Sensor Signal
52-53	-	-	Not Used
54	OG/BK	1230	AT ISS High Signal
55	TAN/BLK	422	TCC Solenoid Valve Control
56	-	-	Not Used