PCM A/T Control System Inputs and Outputs at Connector C ◦ (49P)

Fig 1: Identifying PCM A/T Control Connector C ◦ (49P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

NOTE: Standard battery voltage is about 12 V

PCM CONNECTOR C ◦ (49P) 

TERMINALS DESCRIPTION

Terminal Number	Wire Color	Terminal Name	Description	Signal
C9	GRN/RED	SHD (SHIFT SOLENOID VALVE D)	Drives shift solenoid valve D	With engine running in N, D, and S during no lockup condition about 0 V With engine running in P and R, and in D during lock-up condition battery voltage
C12	YEL/BUL	VCC2 (SENSOR VOLTAGE)	Provides sensor voltage	With ignition switch ON (II)/vehicle in ON mode about 5 0 V
C16	GRN/YEL	SG2 (SENSOR GROUND)	Sensor ground	Less than 0 2 V at all times
C17	YEL/GRN	ATPD (TRANSMISSION RANGE SWITCH D)	Detects transmission range switch D position signal input	In D about 0 V In any position other than D about 5 0V
C18	BLU/YEL	ATPFWD (TRANSMISSION RANGE SWITCH FWD)	Detects transmission range switch FWD position signal input	In D and S about 0 V In any position other than D and S about 5 0V
C19	RED/WHT	ATPRVS (TRANSMISSION RANGE SWITCH R)	Detects transmission range switch RVS position signal input	In P, R, and N about 0V In any position other P, R, and N about 5 0 V
C20	BLU/YEL	SHA (SHIFT SOLENOID VALVE A)	Drives shift solenoid valve A	With engine running in D, S (in 2nd and 3rd gears), and R battery voltage With engine running in P, N, and D (in 1st, 4th, and 5th gears), and S (in 1st and 4th gears) about 0 V
C21	RED	LSA (A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A)	Drives A/T clutch pressure control solenoid valve A	With ignition switch ON (II)/vehicle in ON mode current controlled
C25	WHT	ATPR (TRANSMISSION RANGE SWITCH R)	Detects transmission range switch R position signal input	In R about 0V In any position other than R more than 5 0V
C26	RED/BLK	ATPN (TRANSMISSION RANGE SWITCH N)	Detects transmission range switch N position signal input	In N about 0V In any position other than N battery voltage
C27	BLU/BLK	OP2SW (2ND CLUTCH TRANSMISSION FLUID PRESSURE SWITCH)	Detects 2nd clutch transmission fluid pressure switch signal input	With ignition switch ON (II)/vehicle in ON mode Without 2nd clutch pressure battery voltage With 2nd clutch pressure about 0 V
C28	GRN/WHT	SHB (SHIFT SOLENOID VALVE B)	Drives shift solenoid valve B	With engine running in P, R, N, D (in 1st, 2nd, and 5th gears), and S (in 1st and 2nd gears) battery voltage With engine running in D (in 4th and 5th gears) and S (in 4th gear) about 0 V
C33	BLU/YEL	TATF (ATF TEMPERATURE SENSOR)	Detects ATF temperature signal input	With ignition switch ON (II)/vehicle in ON mode about 0 2-4 0 V (about 1 8 V at operating temperature, depending on ATF temperature)
C37	BLU/YEL	OP4SW (4TH CLUTCH TRANSMISSION FLUID PRESSURE SWITCH)	Detects 4th clutch transmission fluid pressure switch signal input	With ignition switch ON (II)/vehicle in ON mode Without 4th clutch pressure battery voltage With 4th clutch pressure about 0 V
C38	BLU/WHT	OP3SW (3RD CLUTCH TRANSMISSION FLUID PRESSURE SWITCH)	Detects 3rd clutch transmission fluid pressure switch signal input	With ignition switch ON (II)/vehicle in ON mode Without 3rd clutch pressure battery voltage With 3rd clutch pressure about 0 V
C39	GRN	SHC (SHIFT SOLENOID VALVE C)	Drives shift solenoid valve C	With engine running in D and S (in 1st, 3rd, and 5th gears) battery voltage With engine running in P, R, N, D, and S (in 2nd and 4th gears) about 0 V
C41	BRN/YEL	LG1 (LOGIC GROUND)	Ground circuit for PCM circuit	Less than 0 2 V at all times
C46	RED	ATPS (TRANSMISSION RANGE SWITCH S)	Detects transmission range switch S position signal input	In S about 0 V In any position other than S about 5 V