PCM A/T Control System Inputs and Outputs

Fig 1: Identifying PCM A/T Control System Connectors A, B, And C

Courtesy of AMERICAN HONDA MOTOR CO., INC.

PCM CONNECTOR 'A' □ (44P)

PCM CONNECTOR A REFERENCE

Terminal number	Wire color	Signal	Description	Measuring conditions/Terminal voltage
A1	RED	CANL	Sends communication signal	With ignition switch to ON (II): About 2.5 V (pulses)
A2	YEL/BLK	SLS	Drives shift lock solenoid	With ignition switch to ON (II), in P, brake pedal pressed, and accelerator released: About 0 V
A8	WHT/BLK	BKSW	Brake pedal position switch signal input	Brake pedal pressed: Battery voltage Brake pedal released: About 0 V
A12	BLU/BLK	ATPP	Transmission range switch P position signal input	In P: About 0 V In other than P: Battery voltage
A13	GRN	D3SW	D3 switch signal input	With D3 switch released: Battery voltage With D3 switch pressed: About 0 V
A17	ORN	APSA	Detects accelerator pedal position sensor A signal	With ignition switch to ON (II) and accelerator pedal pressed: About 4.65 V With ignition switch to ON (II) and accelerator pedal released: About 0.5 V
A18	YEL	APSB	Detects accelerator pedal position sensor B signal	With ignition switch to ON (II) and accelerator pedal pressed: About 2.325 V With ignition switch to ON (II) and accelerator pedal released: About 0.25 V
A24	GRN	VCC3	Power supply for sensors	With ignition switch to ON (II): About 5.0 V With ignition switch to LOCK (0): About 0 V
A25	WHT	VCC4	Power supply for sensors	With ignition switch to ON (II): About 5.0 V With ignition switch to LOCK (0): About 0 V
A31	BRN	SCS	Detects service check signal	With the SCS shorted with the HDS: About 0 V With the SCS open: About 5.0 V
A34	BLK	SG3	Sensor ground	Less than 1.0 Vat all times
A35	RED	SG4	Sensor ground	Less than 1.0 Vat all times
A36	WHT	CANH	Communication signal outputs	With ignition switch to ON (II): About 2.5 V (pulses)
A43	LT BLU	K-LINE	Communication line PCM-to-DLC	With ignition switch to ON (II) and HDS disconnected: About 10.0 V

PCM CONNECTOR 'B' Δ (44P)

PCM CONNECTOR A REFERENCE

Terminal number	Wire color	Signal	Description	Measuring conditions/Terminal voltage
B1	BLK	PG2	Ground	Less than 1.0 Vat all times
B2	BLK/YEL	VB SOL	Power supply circuit for solenoid valves	With ignition switch to ON (II): Battery voltage With ignition switch to LOCK (0): About 0 V
B18	YEL/RED	VCC1	Power supply circuit	With ignition switch to ON (II): About 5.0 V
B25	BRN/WHT	LSB	A/T clutch pressure control solenoid valve B control	With ignition switch to ON (II): Duty controlled
B30	GRN/RED	MAP	Detects manifold absolute pressure sensor signal	With ignition switch to ON (II): About 3.0 V At idle: About 1.0 V depending on engine speed
B33	GRN/WHT	SG1	Sensor ground	Less than 1.0 V at all times
B35	GRN/RED	LSC	A/T clutch pressure control solenoid valve C control	With ignition switch to ON (II): Duty controlled
B36	BLK	PG1	Ground	Less than 1.0 V at all times
B37	BLK/YEL	IG1	Power supply circuit	With ignition switch to ON (II): Battery voltage With ignition switch to LOCK (0): About 0 V
B39	RED	NM	Input shaft (mainshaft) speed sensor signal input	With ignition switch to ON (II): About 0 V or about 5.0 V With engine at idle in N: About 2.5 V (pulses)
B40	BLU	NC	Output shaft (countershaft) speed sensor signal input	With ignition switch to ON (II): About 0 V or about 5.0 V With vehicle moving: About 2.5 V (pulses)
B43	BRN/YEL	LG2	Ground	Less than 1.0 V at all times
B44	YEL	LC	Torque converter clutch solenoid valve control	During lock-up condition: Battery voltage During no lock-up condition: About 0 V

PCM CONNECTOR 'C' ◦ (44P)

PCM CONNECTOR C REFERENCE

Terminal number	Wire color	Signal	Description	Measuring conditions/Terminal voltage
C9	BLU/RED	EGR	Drives EGR valve	With EGR operating: Duty controlled With EGR not operation: About 0 V
C13	YEL/BLU	VCC2	Power supply for sensors	With ignition switch to ON (II): About 5.0 V With ignition switch to LOCK (0): About 0 V
C14	GRN/YEL	SG2	Sensor ground	Less than 1.0 Vat all times
C15	BLU/WHT	OP3SW	3rd clutch transmission fluid pressure switch signal input	With ignition switch to ON (II): Without 3rd clutch pressure: About 5.0 V With 3rd clutch pressure: About 0 V
C16	BLU/YEL	OP4SW	4th clutch transmission fluid pressure switch signal input	With ignition switch to ON (II): Without 4th clutch pressure: About 5.0 V With 4th clutch pressure: About 0 V
C17	BLU/YEL	ATP FWD	Transmission range switch D and 2 positions signal input	In D and 2: About 0 V In any other positions: Battery voltage
C18	GRN	SHC	Shift solenoid valve C control	With the engine running in 1, and D in 1st, 3rd, and 5th gears: Battery voltage In P, R, N, 2, and D in 2nd gear: About 0 V
C19	RED	LSA	A/T clutch pressure control solenoid valve A control	With ignition switch to ON (II): Duty controlled
C20	WHT/BLK	EGRP	Detects EGR valve position sensor signal	With engine running: About 1.2-3.0 V depending on EGR valve lift
C23	GRN/WHT	SHB	Shift solenoid valve B control	With the engine running in P, R, N, 2, and 1, and D in 1st, 2nd, and 3rd gears: Battery voltage In D in 4th and 5th gears: About 0 V
C25	BLU/YEL	SHA	Shift solenoid valve A control	With the engine running in 2 and 1, and D in 1st, 2nd, and 5th gears: Battery voltage In P, R, N, and D in 3rd and 4th gears: About 0 V
C28	BLU/YEL	ATFT	ATF temperature sensor signal input	With ignition switch to ON (II): About 0.2-4.0 V (About 1.8 V at normal operating temperature) With ignition switch to LOCK (0): About 0 V
C30	WHT	ATPR	Transmission range switch R position input	In R: About 0 V In other than R: Battery voltage
C31	RED/BLK	ATPN	Transmission range switch N position input	In N: About 0 V In other than N: Battery voltage
C32	YEL/GRN	ATPD	Transmission range switch D position input	In D: About 0 V In other than D: Battery voltage
C33	BLU	ATP 2	Transmission range switch 2 position input	In 2: About 0 V In other than 2: Battery voltage
C34	BRN	ATP1	Transmission range switch 1 position input	In 1: About 0 V In other than 1: Battery voltage
C40	BRN/YEL	LG1	Ground	Less than 1.0 Vat all times