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

Fig 1: Identifying PCM A/T Control System Inputs And Outputs At PCM Connector C (49P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

TERMINAL 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, and in D during no lock-up condition: about 0 V With engine running in P and R, and in D during lock-up condition: battery voltage
C12	YEL/BLU	VCC2 (SENSOR VOLTAGE)	Provides sensor voltage	With ignition switch ON (II): 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	In D: about 0 V In any position other than D: battery voltage
C18	BLU/YEL	ATPFWD (TRANSMISSION RANGE SWITCH FWD)	Detects transmission range switch D, 2, and 1 position signal	In D, 2, and 1: about 0V In any position other than D, 2, and 1: battery voltage
C19	RED/WHT	ATPRVS (TRANSMISSION RANGE SWITCH RVS)	Detects transmission range switch P, R, and N position signal	In P, R, and N: about 0 V In any position other than P, R, and N: battery voltage
C20	BLU/YEL	SHA (SHIFT SOLENOID VALVE A)	Drives shift solenoid valve A	With engine running in 2,1, and D (in 1st, 2nd, or 5th gears): battery voltage With engine running in P, R, N, and D (in 3rd 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): current controlled
C25	WHT	ATPR (TRANSMISSION RANGE SWITCH R)	Detects transmission range switch R position signal	In R: about 0 V In any position other than R: battery voltage
C26	RED/BLK	ATPN (TRANSMISSION RANGE SWITCH N)	Detects transmission range switch N position signal	In N: about 0 V In any position other than N: battery voltage
C27	BLU/BLK	OP2SW (TRANSMISSION FLUID PRESSURE SWITCH A (2ND CLUTCH))	Detects transmission fluid pressure switch A (2nd clutch) signal	With ignition switch ON (II): Without 2nd clutch pressure: about 5.0 V 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, 2,1, and D (in 1st, 2nd, or 3rd gears): battery voltage With engine running in D (in 4th and 5th gears): about 0 V
C33	BLU/YEL	TATF (ATF TEMPERATURE SENSOR)	Detects ATF temperature sensor signal	With ignition switch ON (II): about 0.2-4.0 V (about 1.8 V at operating temperature) (depending on ATF temperature)
C35	BRN	ATP1 (TRANSMISSION RANGE SWITCH 1)	Detects transmission range switch 1 position signal	In 1: about 0 V In any position other than 1: battery voltage
C37	BLU/YEL	OP4SW (4TH CLUTCH TRANSMISSION FLUID PRESSURE SWITCH)	Detects 4th clutch transmission fluid pressure switch signal	With ignition switch ON (II): Without 4th clutch pressure: about 5.0 V With 4th clutch pressure: about 0 V
C38	BLU/WHT	OP3SW (TRANSMISSION FLUID PRESSURE SWITCH B (3RD CLUTCH))	Detects transmission fluid pressure switch B (3rd clutch) signal	With ignition switch ON (II): Without 3rd clutch pressure: about 5.0 V With 3rd clutch pressure: about 0 V
C39	GRN	SHC (SHIFT SOLENOID VALVE C)	Drives shift solenoid valve C	With engine running in land D (in 1st, 3rd, and 5th gears): battery voltage With engine running in P, R, N, 2, and D (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	BLU	ATP2 (TRANSMISSION RANGE SWITCH 2)	Detects transmission range switch 2 position signal	In 2: about 0 V In any position other than 2: battery voltage