Powertrain Control Module (PCM) C3 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		15430211 56-Way F Micro-Pack 64 Series Sealed (GY)
Pin	Wire Color	Circuit No.	Function
1-2	-	-	Not Used
3	TN	3221	HO2S Low Signal (Bank 2 Sensor 2)
4	TN/WH	3121	HO2S Low Signal (Bank 1 Sensor 2)
5	YE/BK	1227	TFT Sensor Signal
6	YE	492	MAF Sensor Signal
7	-	-	Not Used
8	GY/WH	3122	HO2S Heater Low Control (Bank 1 Sensor 2)
9	-	-	Not Used
10	OG/WH	3223	HO2S Heater Low Control (Bank 2 Sensor 2)
11	OG/BK	1230	A/T ISS High Signal
12	YE	400	VSS High Signal
13-14	-	-	Not Used
15	GY	773	Transmission Range Switch Signal C
16-17	-	-	Not Used
18	PU	3220	HO2S High Signal (Bank 2 Sensor 2)
19	PU	3120	HO2S High Signal (Bank 1 Sensor 2)
20-21	-	-	Not Used
22	YE	772	Transmission Range Switch Signal B
23	WH	776	Transmission Range Switch Signal P
24	YE	657	TCC Release Switch Signal
25	-	-	Not Used
26	TN	472	IAT Sensor Signal
27-28	-	-	Not Used
29	D-BU	1225	Transmission Fluid Pressure Switch Signal B
30	OG	1226	Transmission Fluid Pressure Switch Signal C
31-32	-	-	Not Used
33	L-GN	1222	1-2 Shift Solenoid Valve Control
34	TN/WH	771	Transmission Range Switch Signal A
35-38	-	-	Not Used
39	BN	418	TCC PWM Solenoid Valve Control
40-43	-	-	Not Used
44	PU	401	VSS Low Signal
45	-	-	Not Used
46	YE/BK	1223	2-3 Shift Solenoid Valve Control
47	OG/BK	1228	PC Solenoid Valve High Control (Sol. A)
48	TN	2762	Low Reference
49	D-BU/WH	1231	A/T ISS Low Signal
50	TN/BK	2760	Low Reference
51	L-BU/WH	1229	PC Solenoid Valve Low Control (Sol. A)
52-56	-	-	Not Used