Back View Of the PCM Connector C4 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		2.5L VIN 4 Powertrain 28 Pin Gray Connector C4 with Orange Terminal Secondary Lock Insert
Pin	Wire Color	Function
C4-1	GRN/BLK	EVAP Canister Purge Valve Control
C4-2	BLK/ORN	Gound
C4-3	BLK/WHT	Ignition Positive Voltage
C4-4	LT GRN/WHT	EGR Valve Coil Control
C4-5	LT GRN	EGR Valve Coil Control
C4-6	PNK/BLK	Fuel Injector #2 Control
C4-7	PNK	Fuel Injector #1 Control
C4-8	BLK/GRN	Ground
C4-9	BLK/BLU	Ground
C4-10	BRN/YEL	Ignition Coil #4 Control
C4-11	BRN/WHT	Ignition Coil #3 Control
C4-12	BRN/BLK	Ignition Coil #2 Control
C4-13	BRN	Ignition Coil #1 Control
C4-14	PPL/BLK	IAC Valve Coil Control
C4-15	LT GRN/BLK	IAC Valve Coil Control
C4-16	LT GRN/RED	EGR Valve Coil Control
C4-17	LT GRN/YEL	EGR Valve Coil Control
C4-18	PNK/BLU	Fuel Injector #4 Control
C4-19	PNK/GRN	Fuel Injector #3 Control
C4-20	BLU/BLK	Ignition Positive Voltage
C4-21	BLU/BLK	Ignition Positive Voltage
C4-22	BLK/BRN	Ignition Coil #6 Control
C4-23	BRN/RED	Ignition Coil #5 Control
C4-24	PPL/YEL	IAC Valve Coil Control
C4-25	GRY/BLU	IAC Valve Coil Control
C4-26	BLK/YEL	Crank Signal
C4-27	GRY/BLK	Fuel Injector #6 Control
C4-28	GRY/GRN	Fuel Injector #5 Control